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Unread 08-22-2011, 06:14 PM   #1
Spuznick242
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Help! Injector issues!

Alright, I did the #19 injector upgrade. They were rebuilt injectors and the right ones (I posted a direct link a week ago to make sure they were) but they came with new O rings insalled. The problem is it is running like garabe. I put just about 5 miles on it maybe a little more since it's swapped and I already broke down on the side of the road and had to replace the spark plugs. Any advice on how to get the computer to tune it and adjust properly and as fast as possilbe?

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DD- 1995 YJ 2.5L, Cat delete, 19lb injectors, 30/9.5r15
Trail Rig- 1994 YJ 4.0L, Rubicon Express 4.5inch lift, 1inch body, D30 Aussie, 33/12.5/r15 Cooper Mud Terrains, front bumper, rocker guards
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Unread 08-22-2011, 06:22 PM   #2
oldtime_ironman
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What did the plugs look like? I'm thinking maybe you were running too rich? Cuz I remember threads where other guys did the swap and had to use a different fuel pressure regulator. Either that or you still got some air in them.
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Unread 08-22-2011, 06:25 PM   #3
mrdeath2000
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any inectors leaking? are the connectors on the right inectors? did you reset the computer (touch negative to postive cable)?
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Unread 08-22-2011, 07:05 PM   #4
Spuznick242
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I am deffinatly running too rich. And the plugs were so bad I was running on one cylinder. I reset the computer and changed the plugs, I shouldnt have to change fuel pressure regulators, I know plenty of jeeps that have the swap but no regulator.
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DD- 1995 YJ 2.5L, Cat delete, 19lb injectors, 30/9.5r15
Trail Rig- 1994 YJ 4.0L, Rubicon Express 4.5inch lift, 1inch body, D30 Aussie, 33/12.5/r15 Cooper Mud Terrains, front bumper, rocker guards
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Unread 08-22-2011, 07:06 PM   #5
Spuznick242
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And no the injectors arent leaking, and yes their connected to the right injector, the wires are only 3 inches long and the injectors are like 4 inches apart...kinda hard to mess that up, but there isnt air in it yet because it is running and it has too much fuel. The problem is the computer adjusting it's self at this point.
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DD- 1995 YJ 2.5L, Cat delete, 19lb injectors, 30/9.5r15
Trail Rig- 1994 YJ 4.0L, Rubicon Express 4.5inch lift, 1inch body, D30 Aussie, 33/12.5/r15 Cooper Mud Terrains, front bumper, rocker guards
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Unread 08-22-2011, 07:13 PM   #6
oldtime_ironman
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Quote:
Originally Posted by Spuznick242 View Post
And no the injectors arent leaking, and yes their connected to the right injector, the wires are only 3 inches long and the injectors are like 4 inches apart...kinda hard to mess that up, but there isnt air in it yet because it is running and it has too much fuel. The problem is the computer adjusting it's self at this point.
Well OK then. The computer can only adjust so far tho, and I've never heard of anyone else having this prob. So my bet is on getting a different fuel pressure regulator. I saw an epic thread about it a while ago, but I can't find it -- the guy ended up using an FPR out of a dodge caravan.

.
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Unread 08-22-2011, 07:39 PM   #7
mrdeath2000
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Which injector is yours on this list?
http://www.witchhunter.com/injectordata1.php4

I think 210cc at 43.5psi is what you're after, but it does sound like you have a computer issue.

Was it having any issues with the old injectors? I mean was this a standalone mod at the time or did you do a bunch of things at once?
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Unread 08-22-2011, 11:07 PM   #8
GottaYJ
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The part # for the FPR is 5277829 for a town and country minivan.
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Unread 08-26-2011, 08:36 AM   #9
Spuznick242
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Sorry, thanks for all the advice but I was out of town recently and didnt have time to work on the jeep. But I did one mod at a time, I did the 4.0 Throttle Body Swap first about 2000 miles ago and the Cat has been punched out for years, and then the current issue, the injectors. I shouldnt need a FPR, other 2.5L use this as a direct swap that don't need the FPR. And the injectors I bought were http://cgi.ebay.com/ebaymotors/8-For...item336b07cc73 these I think, it's not the same seller but it's the same thing. I just picked up the scanner from my buddy so I'm going to use that to reset and try to help the computer relearn everything.
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DD- 1995 YJ 2.5L, Cat delete, 19lb injectors, 30/9.5r15
Trail Rig- 1994 YJ 4.0L, Rubicon Express 4.5inch lift, 1inch body, D30 Aussie, 33/12.5/r15 Cooper Mud Terrains, front bumper, rocker guards
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Unread 08-26-2011, 08:51 AM   #10
mrdeath2000
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I just got my TB in last night from Bounty Hunter, and hooked it all back up, fired up no problem. I will drive it shortly here to test it more and Ill let you know.
You shouldnt need the FPR.
As I understand it 17.4 @39psi is what the jeep runs oem. Ford 19# are really 20# injectors @43.5. When we bring it down to 39, it is just under 19# (my math sheet is at work).
280150556 is what I have and is the same as the 280150943 (both design 2 with EV1 plugs 210cc).
Yours are 280155700 if you bought the ones from your other post (design 3 ev1 plug).
Yours are also 204cc which should be damn perfect. Mine are 210cc and I'm afraid Ill be rich.
Do you have any ignition upgrades and higher gap on plugs? maybe not burning all the extra fuel? :/
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Unread 08-26-2011, 09:01 AM   #11
Spuznick242
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So I do have the right injectors then? But I dont have any ignition upgrades. I was thinking about getting a more powerful plug and opening up the gap. Is there any real ignition upgrades for jeeps other than plugs and wires? I should get upgraded plugs and wires anyways but should I just go with ones from Napa?
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DD- 1995 YJ 2.5L, Cat delete, 19lb injectors, 30/9.5r15
Trail Rig- 1994 YJ 4.0L, Rubicon Express 4.5inch lift, 1inch body, D30 Aussie, 33/12.5/r15 Cooper Mud Terrains, front bumper, rocker guards
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Unread 08-26-2011, 09:42 AM   #12
mrdeath2000
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Your injectors are right as far as part# and specs.
I would upgrade them. I dont run any special plugs, just gapped them to .055. Wires, find a low resistance wire. Coil ... that will take a little more research. Cap/rotor, if you get a different one, try to not get a black one, they promote carbon tracking, DUI makes some.

I just got back from running mine and it felt fine, granted it's not my DD so I cant really say what difference it made until im on the freeway. But after I pulled in and let it idle, it did seem to idle a little rough, but that was because it was idling a tad low, maybe 50rpms low. If i gave it an RCH of gas it idled perfect. I assume it is learning...

Are you Positive yours is running rich? What symptoms were you having before it broke down? Did it just shutoff or start bucking. more details the better.
Did you open up your intake to match the TB?
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Unread 08-26-2011, 09:54 AM   #13
bharris68
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if you have upgraded the injectors to #19 pound, you should probably look at your fuel pressure regulator as mentioned earlier. i.e. what is the stock pressure or stock rating and what have you upgraded it to? There are relatively very few "upgrades" you can do to an engine that won't require some kind of "equal and opposite" reaction to assure compatability.
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Unread 08-26-2011, 09:57 AM   #14
Spuznick242
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I was deff. running rich. It was running on 2 cylinders when I stopped, foul plugs and backfired. I know it's running too rich for sure. I'll look into upgrade my ignition but I'll start with opening up the gap on the plugs. But I dont need to open my intake to match the TB, it's a direct match up.
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DD- 1995 YJ 2.5L, Cat delete, 19lb injectors, 30/9.5r15
Trail Rig- 1994 YJ 4.0L, Rubicon Express 4.5inch lift, 1inch body, D30 Aussie, 33/12.5/r15 Cooper Mud Terrains, front bumper, rocker guards
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Unread 08-26-2011, 11:04 AM   #15
mrdeath2000
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Oh ok, I wasnt sure if you just did a 4.0TB or had it punched out to 62mm.
The reason for not needing the FPR is that the increase in airflow from the new TB uses the increase in fuel provided and the ECM can adjust ~15-20%.
Stock FP is 39psi with a flow of 17.4lbs which would be 18.38lbs (193cc) at 43.5psi
Ford 19's are 18.94lbs at 39psi which is 20lbs (210cc) at 43.5psi (for the 556 and 943's)
His 700's would be 18.4lbs at 39psi which is 19.43(204cc) at 43.5psi

How many miles/run time did you have after the swap before this happened?
Everything was fine prior, then the only change was these injectors? Can you swap in the old injectors and see if it produces the same results? Also, you can isolate those 4 injectors and try the other 4 (you bought 8?). or just change the two fouled cylinders.
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