Forgive me father, I have sinned - Page 2 - JeepForum.com

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post #16 of 55 Old 03-19-2014, 07:39 PM
tcar
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2000 WJ 
 
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Fuel filter???... after sitting like that.

The gas was probably crap too.


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post #17 of 55 Old 03-19-2014, 07:51 PM Thread Starter
sparkieCHB
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Quote:
Originally Posted by tcar View Post
Fuel filter???... after sitting like that.

The gas was probably crap too.
Yeah the gas was bad after 2 years but the tank was flushed, cleaned and a new filter was installed with the new pump. I have 33 psi at the rail with the fpr plugged in, around 42 with it unplugged. I think I'm getting all the fuel I need, starting to run out of ideas
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post #18 of 55 Old 03-20-2014, 07:16 AM
jnowak
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1993 ZJ 
 
Join Date: Nov 2011
Location: dahlonega
Posts: 495
The only thing I can suggest on the tc is get it up to highway speed, I think it's 50 mph when it is suppose to lock, tap the brakes and see if your rpms jump. They should raise about 250 rpms. That would tell you if it is going in and out of lock up. There is a couple write up/ forms on here about tc. But I haven't seen one that goes Into the wiring.
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post #19 of 55 Old 03-20-2014, 03:29 PM
RoldGold
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1996 ZJ 
 
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Location: Philadelphia
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Did you unplug the upstream O2 sensor?

1996 Grand Cherokee Limited 4.0L
PSC Steering Gear; NP249 w/ new VC; Moog TRE's, Track Bar, Stabilizer bar bushings and endlinks, control arm bushings
Still no lift, and almost no paint on the hood
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post #20 of 55 Old 03-20-2014, 03:52 PM Thread Starter
sparkieCHB
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Quote:
Originally Posted by RoldGold View Post
Did you unplug the upstream O2 sensor?
Its a 93. Obd 1 has only one upstream, no down stream. And yes I did try disconnecting the o2
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post #21 of 55 Old 03-24-2014, 07:34 PM Thread Starter
sparkieCHB
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Well the jeep is running like hammered dog s***, its got me so frustrated I'm ready to part it out. It has developed a new problem of backfiring through the tb. While idling if I stab the gas it either stutters and stumbles up to rpm (takes a few seconds) or it falls flat on its face and makes a ticking/knocking noise like it is running out of gas, then dies but not before a giant backfire through the tb followed by a good bit of white smoke like it is over-fueling. Then it has a hard start issue that sounds like the starter or solenoid s*** the bed, almost like it is vapor locked or the timing is heavily advanced and its suffering from timing fight. Another thing I find strange is I can get the thing to run a lot better by unplugging the map and playing with the throttle, the map tested good but I was running out of options so in replaced it, no go.

Any help is appreciated, if I can't get it fixed soon its getting parted
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post #22 of 55 Old 03-24-2014, 07:50 PM
ZeeJay1997
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1997 ZJ 
 
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all the sensors on the 93 ground on the block somewhere. have you checked the sensor grounds with a meter? the ground wire for each sensor will be the same on all fuel control/timing sensors ... tps, map, coolant (i think), crank and cam. check all of them for voltage while you are there.

something else to check, the only time mine has ever backfired thru the TB is when the fuel pump relay was bad. dont look at me like i'm crazy, i cant explain it...

for giggles and grins, check firing order on plug wires.


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post #23 of 55 Old 03-24-2014, 08:24 PM
bobinAZ
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1993 ZJ 
 
Join Date: Feb 2014
Location: bullhead city
Posts: 194
I see you unplugged the 02 sensor. Did the jeep run worse? It should. I just replaced my 02 sensor on my 93. I never got a code, and after the jeep ran like I had 2 extra cylinders. I got mine from Autozone for $55.00 I got the NGK

I'm stuck in the "why not cycle" Since i have to do, A & B "why not" do C & D while I'M at it.
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post #24 of 55 Old 03-24-2014, 08:36 PM Thread Starter
sparkieCHB
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Quote:
Originally Posted by ZeeJay1997 View Post
all the sensors on the 93 ground on the block somewhere. have you checked the sensor grounds with a meter? the ground wire for each sensor will be the same on all fuel control/timing sensors ... tps, map, coolant (i think), crank and cam. check all of them for voltage while you are there.

something else to check, the only time mine has ever backfired thru the TB is when the fuel pump relay was bad. dont look at me like i'm crazy, i cant explain it...

for giggles and grins, check firing order on plug wires.
Thanks for the quick reply zee. I'm pretty good with a meter (I do high voltage electrical) and I have verified a good ground to the PCM as well as the chassis grounds and have a good connection at all of them. MAP is new, TPS is new, I have tested everything I possibly can, cap, rotor, plugs, and wires are also new. The backfire is strange and I can get it to run better by unplugging the MAP and plugging off its vacuum port, but only at idle and only for about a minute. It is the weirdest problem I have ever come across on a jeep.

Double checked firing order and the condition of the cap and rotor, can't figure it out. Runs great going down the road, just at idle and close to a stop is when it runs like hell.
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post #25 of 55 Old 03-24-2014, 08:41 PM
ZeeJay1997
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Quote:
Originally Posted by sparkieCHB View Post
I have verified a good ground to the PCM as well as the chassis grounds and have a good connection at all of them.
That's step in the right direction, but we need to know that ground is making it to the sensors. They have a common ground somewhere on the engine and I cant tell you where it is because I've only seen it on a diagram.


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post #26 of 55 Old 03-24-2014, 08:48 PM
MN59ZJ
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1998 ZJ 
 
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"210,XXX, bone stock, sat for 2 years before I got it. I bought it for 400$"

There's you're problem right there. You bought a POS!


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post #27 of 55 Old 03-24-2014, 08:56 PM Thread Starter
sparkieCHB
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Quote:
Originally Posted by MN59ZJ View Post
"210,XXX, bone stock, sat for 2 years before I got it. I bought it for 400$"

There's you're problem right there. You bought a POS!


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Hahahahah! I know I know, but actually I am only the second owner, the po is a little old lady who drove it until her son didn't want her driving so he parked it, 2 years later I bought it. Never been monkey f***ed just a slight lack of maintenance and some cob webs.

It just has this problem I can't get it to shake
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post #28 of 55 Old 03-24-2014, 09:03 PM Thread Starter
sparkieCHB
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Quote:
Originally Posted by ZeeJay1997 View Post
That's step in the right direction, but we need to know that ground is making it to the sensors. They have a common ground somewhere on the engine and I cant tell you where it is because I've only seen it on a diagram.
Like I said I'm an electrician, I'm pretty good with circuitry and how to use a multi meter, I have verified a good ground at all sensors themselves as well as the grounding harness, (grounds on the coil mounting bracket, dipstick tube etc).

The grounds are good
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post #29 of 55 Old 03-24-2014, 09:17 PM
ZeeJay1997
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1997 ZJ 
 
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Quote:
Originally Posted by sparkieCHB View Post
Like I said I'm an electrician, I'm pretty good with circuitry and how to use a multi meter, I have verified a good ground at all sensors themselves as well as the grounding harness, (grounds on the coil mounting bracket, dipstick tube etc).

The grounds are good
Okay good, you didnt say you had verified the sensor grounds, just the chassis grounds.

Have you pulled the connector off the PCM and check for pushed back sockets?


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post #30 of 55 Old 03-24-2014, 09:33 PM Thread Starter
sparkieCHB
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PCM connector looks good, harness running to it is wrapped in original loom and all wires look good, It seems electrical which is why its got me pissed, I just can't figure it out
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