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post #76 of 113 Old 10-15-2019, 11:20 AM
1project2many
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Do you have a buddy nearby that is willing to loan you an ecm?

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post #77 of 113 Old 10-15-2019, 11:43 AM
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another suggestion, eng hot at operating temp @195 , unplug o2 sensor, probe the sensor return on the o2 sensor itself - what is reading AND will richening and leaning mix cause a voltage shift?

When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
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post #78 of 113 Old 10-15-2019, 01:33 PM Thread Starter
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Quote:
Originally Posted by 1project2many View Post
Do you have a buddy nearby that is willing to loan you an ecm?
Unfortunatly I do not.

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Originally Posted by jtec View Post
another suggestion, eng hot at operating temp @195 , unplug o2 sensor, probe the sensor return on the o2 sensor itself - what is reading AND will richening and leaning mix cause a voltage shift?
The sensor gives me no reading. I have tried it with 2. I also tried heating them with a propane torch. I need to grab a new multi meter while I am out tomorrow. I dont think my cheap $12 meter is sensitive enough to reliably read that low to be hionest. On top of being cheap its quite old. But I get a reading anywhere between .13 and .2 volts with it hooked up and back probing it. If I rev the engine the voltage will rise to .26 at the most is the RPM's come down so does the voltage. Its definitly not sweeping like it should or changing much at all. I can get it to shift .01 - .02 volts if I make it so rich it almost stalls. If I pull the brake booster hose to try to make it go lean there is no change.

1995 YJ. 2 inch BDS Spring lift. 1 inch shackle lift. 1.25 inch JKS Body Lift 33x12.5x15's. Engo 10,000 pound winch.

Quote:
Originally Posted by Magnum View Post
I gave the Jeep the required offering of $$, sweat, and blood, and everything works fine now. -- Jim
Quote:
Originally Posted by ldso View Post
. It started with a $200 axle, and a few thousand dollars later I was done :)
Quote:
Originally Posted by Luuca View Post
diagnose the real issue before you start going all Obama on it - spending mad cash you'll need for other important things.

Ask me how I know...
Quote:
Originally Posted by Overhead View Post
this is also my second set of RC springs this year. I'd rather spend the money again and get something that will last.
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post #79 of 113 Old 11-04-2019, 11:15 AM Thread Starter
Siva283
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New wiring Haress and a known good used ECM should arrive tomorrow. The bolt in my current ECM is stripped and its cold so I dont feel like fighting it. When I do I figure I will have a spare ECM. I also ordered a new O2 sensor which will be here tonight. So eithier tonight or tomorrow I will start pulling the engine harness out.

If anyone has tips or tricks they would be greatly appreciated.

As a side not the colder it gets the ****tier it runs. Its now got a random miss even when warm. On top of the wiring harness I have spares of almost every sensor the engine has. So hopefully there will be some good news by thursday or friday since I am figuring this will take atleast 2 evenings in the dark after work. Thankfully I have a nice bright work light.

1995 YJ. 2 inch BDS Spring lift. 1 inch shackle lift. 1.25 inch JKS Body Lift 33x12.5x15's. Engo 10,000 pound winch.

Quote:
Originally Posted by Magnum View Post
I gave the Jeep the required offering of $$, sweat, and blood, and everything works fine now. -- Jim
Quote:
Originally Posted by ldso View Post
. It started with a $200 axle, and a few thousand dollars later I was done :)
Quote:
Originally Posted by Luuca View Post
diagnose the real issue before you start going all Obama on it - spending mad cash you'll need for other important things.

Ask me how I know...
Quote:
Originally Posted by Overhead View Post
this is also my second set of RC springs this year. I'd rather spend the money again and get something that will last.
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post #80 of 113 Old 11-05-2019, 08:13 AM Thread Starter
Siva283
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Well tonight starts the surgery I wil be pulling the old Harness and ECM out. If time permits I will get the replacements in. then I will spend the winter repairing the old harness and eithier repairing or sending the old ECM out to be rebuilt because spares are never a bad thing.

1995 YJ. 2 inch BDS Spring lift. 1 inch shackle lift. 1.25 inch JKS Body Lift 33x12.5x15's. Engo 10,000 pound winch.

Quote:
Originally Posted by Magnum View Post
I gave the Jeep the required offering of $$, sweat, and blood, and everything works fine now. -- Jim
Quote:
Originally Posted by ldso View Post
. It started with a $200 axle, and a few thousand dollars later I was done :)
Quote:
Originally Posted by Luuca View Post
diagnose the real issue before you start going all Obama on it - spending mad cash you'll need for other important things.

Ask me how I know...
Quote:
Originally Posted by Overhead View Post
this is also my second set of RC springs this year. I'd rather spend the money again and get something that will last.
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post #81 of 113 Old 11-05-2019, 06:29 PM
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Good luck

its a rusty one

https://www.jeepforum.com/forum/f22/90-yj-frame-swap-build-up-1434246/
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post #82 of 113 Old 11-05-2019, 07:52 PM Thread Starter
Siva283
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Well the ecm won't be here till tomorrow. So I got the old harness out and the new one 90% in. I need to drop the tank to run the fuel pump and gas gauge wires. I got 2 more grounds to hook up and I need to run the one connector for the gauges through the firewall. I also need to make new battery cables and the cables to run the 136amp alt straight to the battery so hope Thursday it'll be done. Tomorrow I'd date night and I gotta pick up wire and ring terminals and new battery terminals since I don't like the ones I have. I did have to splice the field coil connector back on since they ripped it off. I'm a little mad about that since a paid $300 for a known good wire harness. Oh and I need to hook up and install the new o2 sensor. If this don't work I will start over trouble shooting. My old harness was hack to death by the po so it's still money well spent in my opinion. It's also a known good ecm. I got a good deal so yes it is potentially me just throwing some money at it but it's cold now and I want it done.

1995 YJ. 2 inch BDS Spring lift. 1 inch shackle lift. 1.25 inch JKS Body Lift 33x12.5x15's. Engo 10,000 pound winch.

Quote:
Originally Posted by Magnum View Post
I gave the Jeep the required offering of $$, sweat, and blood, and everything works fine now. -- Jim
Quote:
Originally Posted by ldso View Post
. It started with a $200 axle, and a few thousand dollars later I was done :)
Quote:
Originally Posted by Luuca View Post
diagnose the real issue before you start going all Obama on it - spending mad cash you'll need for other important things.

Ask me how I know...
Quote:
Originally Posted by Overhead View Post
this is also my second set of RC springs this year. I'd rather spend the money again and get something that will last.
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post #83 of 113 Old 11-06-2019, 08:02 AM
fishadventure
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You need to put a 140A breaker between battery and alternator.
I can’t remember (and haven’t done my current jeep yet) but on the several I have done direct with brand new vastly oversized 2/0 battery cables I made up, I think I just removed the oem alternator to PDC and made up a new (and oversized!) 2-gauge from battery to PDC input. One of them I might have left the oem charge wire to PDC and just ran a second cable with 140A breaker direct to battery post to charge battery- which I don’t like that idea but I did it for reasons I can’t recall at the moment- maybe it was temporary because I didn’t have the right new lugs on hand for the PDC?

Anyway, the latest one has a 160A alternator and a 150A breaker. Although it doesn’t actually happen frequently - not often- I’m surprised by the number of times his breaker has tripped under heavy, long winching operations. While I made his charge cable oversized-huge so not really a fire danger, he previously had had a PDC and underhood harness fire while winching.
I mention these things to highlight the importance of adequate cable size with a breaker.

Since you're doing the labor investment on the harness anyway, maybe just upgrade the wiring to over-capacity while you’re at it and completely bypass the PDC for charging duties. I use the ABYC ‘chart’ for gauge at amp load and distance, then use one size or more bigger. Or in the case of the 2/0, it was the smallest bigger gauge I had on hand at the time and I had the right terminals for it so I just did it.

[size=ď3Ē]Shackles & D-rings are different things.
Cranking IS turning over
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post #84 of 113 Old 11-06-2019, 10:31 AM Thread Starter
Siva283
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Quote:
Originally Posted by fishadventure View Post
You need to put a 140A breaker between battery and alternator.
I canít remember (and havenít done my current jeep yet) but on the several I have done direct with brand new vastly oversized 2/0 battery cables I made up, I think I just removed the oem alternator to PDC and made up a new (and oversized!) 2-gauge from battery to PDC input. One of them I might have left the oem charge wire to PDC and just ran a second cable with 140A breaker direct to battery post to charge battery- which I donít like that idea but I did it for reasons I canít recall at the moment- maybe it was temporary because I didnít have the right new lugs on hand for the PDC?

Anyway, the latest one has a 160A alternator and a 150A breaker. Although it doesnít actually happen frequently - not often- Iím surprised by the number of times his breaker has tripped under heavy, long winching operations. While I made his charge cable oversized-huge so not really a fire danger, he previously had had a PDC and underhood harness fire while winching.
I mention these things to highlight the importance of adequate cable size with a breaker.

Since you're doing the labor investment on the harness anyway, maybe just upgrade the wiring to over-capacity while youíre at it and completely bypass the PDC for charging duties. I use the ABYC Ďchartí for gauge at amp load and distance, then use one size or more bigger. Or in the case of the 2/0, it was the smallest bigger gauge I had on hand at the time and I had the right terminals for it so I just did it.
This is exactly what I am doing 2/0 welding cable from Alt to Battery. The battery will feed the PDC not the alt. It made a difference when I did it this way on my other jeep. The battery removes AC ripple from the system so cleaner sensor signals. I will be getting a 150amp slow blow fuse to handle surges that would normally trip a breaker. I also have a 1200cca battery in there with a 120 minute reserve for the winch it will be getting soon.

I am picking up the cabling and lugs tonight. Tomorrow I am hoping to finish but it may be saturday since I have to drop the tank to get to the connector. I am making new battery cables as well I am hoping I can find that odd double lug for the PDC if not I may have to order it and wait for that one. Though I guess it doesnt really need upgraded. since it will not have more than factory draw on it. Now I have a spare PDC to play with too.

I did end up getting cold and lazy and cutting the old harness in a few places so I will not be repairing that. Took forever to get out but the new one went right in. All thats left is the battery cables and the ground at the dipstick and the fuel pump wires. Then I can put the computer in and cross my fingers she fires up and runs right.

1995 YJ. 2 inch BDS Spring lift. 1 inch shackle lift. 1.25 inch JKS Body Lift 33x12.5x15's. Engo 10,000 pound winch.

Quote:
Originally Posted by Magnum View Post
I gave the Jeep the required offering of $$, sweat, and blood, and everything works fine now. -- Jim
Quote:
Originally Posted by ldso View Post
. It started with a $200 axle, and a few thousand dollars later I was done :)
Quote:
Originally Posted by Luuca View Post
diagnose the real issue before you start going all Obama on it - spending mad cash you'll need for other important things.

Ask me how I know...
Quote:
Originally Posted by Overhead View Post
this is also my second set of RC springs this year. I'd rather spend the money again and get something that will last.
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post #85 of 113 Old 11-06-2019, 01:38 PM
fishadventure
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Just to keep going on the excessive side ha ha Ha you should upgrade your firewall groundstraps while you’re at it.
I ran fresh six gauge? negatives.

I started at the alternator made a connection at the coil bracket ran that to the dipstick mount and then from the dipstick mount around to the firewall, the miscellaneous ground wire that comes out of the harness (that I think is the ecu negative?) that you may or may not have, and then a stinking heavy 2/0 from the dipstick to the battery negative. I might also have a neg(-) jumper to the intake manifold on mine. If I don’t I meant to.

If you are not running a dedicated huge negative from your winch to the battery, I would recommend that you do that, or at the very least put a negative cable in for winch support from the battery negative to the frame itself. I think lacking a true ground to the frame can be responsible for at the least poor winch performance or at worst - a fire.

[size=ď3Ē]Shackles & D-rings are different things.
Cranking IS turning over
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post #86 of 113 Old 11-07-2019, 06:44 AM Thread Starter
Siva283
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Quote:
Originally Posted by fishadventure View Post
Just to keep going on the excessive side ha ha Ha you should upgrade your firewall groundstraps while youíre at it.
I ran fresh six gauge? negatives.

I started at the alternator made a connection at the coil bracket ran that to the dipstick mount and then from the dipstick mount around to the firewall, the miscellaneous ground wire that comes out of the harness (that I think is the ecu negative?) that you may or may not have, and then a stinking heavy 2/0 from the dipstick to the battery negative. I might also have a neg(-) jumper to the intake manifold on mine. If I donít I meant to.

If you are not running a dedicated huge negative from your winch to the battery, I would recommend that you do that, or at the very least put a negative cable in for winch support from the battery negative to the frame itself. I think lacking a true ground to the frame can be responsible for at the least poor winch performance or at worst - a fire.
Funny you should say that.

I have Alt Positive and Ground going to the Battery with 2/0. Then I have 2/0 From Battery to Block and Battery to Body. I have 2/0 from frame to block. When I add the winch positive and negative will go directly to body. Not only am I going overboard with the grounds I am going nuclear. I also have that ground gor the ECU at the dipstick which is where I am connecting battery to block and block to frame.

1995 YJ. 2 inch BDS Spring lift. 1 inch shackle lift. 1.25 inch JKS Body Lift 33x12.5x15's. Engo 10,000 pound winch.

Quote:
Originally Posted by Magnum View Post
I gave the Jeep the required offering of $$, sweat, and blood, and everything works fine now. -- Jim
Quote:
Originally Posted by ldso View Post
. It started with a $200 axle, and a few thousand dollars later I was done :)
Quote:
Originally Posted by Luuca View Post
diagnose the real issue before you start going all Obama on it - spending mad cash you'll need for other important things.

Ask me how I know...
Quote:
Originally Posted by Overhead View Post
this is also my second set of RC springs this year. I'd rather spend the money again and get something that will last.
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post #87 of 113 Old 11-07-2019, 05:24 PM Thread Starter
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OK so I got it all done and she's running no codes runs beautifully again. However I can only start it by jumping the relay for the starter. When I turn the key to start the radio and dash lights go off but nothing. I have no idea which year this harness is from as they didn't exactly send me what I ordered but I believe they moved the pin for the starter signal. Does anyone know which pin needs to be moved on the harness side of the bulkhead connector. I believe there is only 2 positions it could be. I am assuming this harness is a 94 or 95.

1995 YJ. 2 inch BDS Spring lift. 1 inch shackle lift. 1.25 inch JKS Body Lift 33x12.5x15's. Engo 10,000 pound winch.

Quote:
Originally Posted by Magnum View Post
I gave the Jeep the required offering of $$, sweat, and blood, and everything works fine now. -- Jim
Quote:
Originally Posted by ldso View Post
. It started with a $200 axle, and a few thousand dollars later I was done :)
Quote:
Originally Posted by Luuca View Post
diagnose the real issue before you start going all Obama on it - spending mad cash you'll need for other important things.

Ask me how I know...
Quote:
Originally Posted by Overhead View Post
this is also my second set of RC springs this year. I'd rather spend the money again and get something that will last.
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post #88 of 113 Old 11-07-2019, 05:34 PM Thread Starter
Siva283
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I guess it could also be nss but I thought you could bypass that by grounding pin 85 of the relay which didn't work

1995 YJ. 2 inch BDS Spring lift. 1 inch shackle lift. 1.25 inch JKS Body Lift 33x12.5x15's. Engo 10,000 pound winch.

Quote:
Originally Posted by Magnum View Post
I gave the Jeep the required offering of $$, sweat, and blood, and everything works fine now. -- Jim
Quote:
Originally Posted by ldso View Post
. It started with a $200 axle, and a few thousand dollars later I was done :)
Quote:
Originally Posted by Luuca View Post
diagnose the real issue before you start going all Obama on it - spending mad cash you'll need for other important things.

Ask me how I know...
Quote:
Originally Posted by Overhead View Post
this is also my second set of RC springs this year. I'd rather spend the money again and get something that will last.
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post #89 of 113 Old 11-07-2019, 06:29 PM
Boojo35
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Good to hear progress is being made.

If you cannot fix it with a hammer then it has to be an electrical problem.
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post #90 of 113 Old 11-07-2019, 06:51 PM
fishadventure
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By “the relay” you mean the solenoid on starter or the actual relay that (iirc) is in the PDC? Pretty sure you mean the relay in the PDC. So I think you’re probably correct about a wire being on the wrong pin so to speak.

Let me look on my phone here; it is possible I have the 60 pin connector layout with function and color on a chart still from when I converted from 2.5 to 4.0 and had to play musical pins in a couple spots. The starter wasn’t one of them for me but everything is on there.

If I find it I’ll post it. Or the other alternative is I found it online by going to Yahoo and searching on “1991 Jeep Wrangler 60 pin connector diagram” or “1991 Jeep Wrangler YJ bulkhead connector diagram” or some such. I’ve also seen it here on jeepforum in the past

[size=ď3Ē]Shackles & D-rings are different things.
Cranking IS turning over
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