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Old 03-09-2012, 04:20 PM   #1
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Unhappy Helppp Pleez

I have a 1994 wrangler SE 4.0L 5 spd.
When i start it up, it will idle a little rough, when in motion i get backfire (exhaust), miss and really no power. Then as it warms up just a little1-2 mins. Runs like a champ. After completely warmed up misses in all gears at all speeds. No light and no codes when i do the key on off on off on thing.
Have changed many parts under the hood and fuel pump. Just don't know where to go now.
Anyone know where to go now.
EGR Valve?

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Old 03-09-2012, 05:05 PM   #2
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Quote:
Originally Posted by tinkerbob
I have a 1994 wrangler SE 4.0L 5 spd.
When i start it up, it will idle a little rough, when in motion i get backfire (exhaust), miss and really no power. Then as it warms up just a little1-2 mins. Runs like a champ. After completely warmed up misses in all gears at all speeds. No light and no codes when i do the key on off on off on thing.
Have changed many parts under the hood and fuel pump. Just don't know where to go now.
Anyone know where to go now.
EGR Valve?
I'm having the same issues. Mine sputters/hesitates almost like its gonna completely stall sometimes. At start up it revs up over 2500RPMs till I press the gas pedal then it comes down to normal.

But the hesitating doesn't stop,.. I have a thread on this and getting suggestions/opinions.

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Old 03-09-2012, 05:37 PM   #3
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The best bet would be to take it to a shop to see all the data that the computer is seeing. We have a snap-on diagnostic tool that we use. For instance, if your coolant temp sensor is reading -40 that would give you rough/no run issues. Also get someone to check codes with a scanner, that will tell you for sure what codes you have.
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Old 03-09-2012, 05:43 PM   #4
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Does my 92 YJ have a thing to plug the reader thingy on? I thought it didn't
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Old 03-09-2012, 05:50 PM   #5
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Smile

Taking it to a shop is a last resort. My limited disability income does not allow for such luxuries.
The person i got it from had it in a shop $300 later no better. Not a good shop!!!
The previous owner changed the distributor, fuel pump, plugs, cap, rotr, wires, map sensor, and a couple more sensors under the hood. no luck.
Tomorrow is supposed to be above 30 degrees out maybe i will chk a few vac lines and the egr valve.
Thanks for the input guys.
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Old 03-09-2012, 10:11 PM   #6
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Quote:
Originally Posted by MickeYJ
Does my 92 YJ have a thing to plug the reader thingy on? I thought it didn't
According to my scanner it does. If it does it should be on the driverside firewall to the right of the master cylinder.
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Old 03-09-2012, 10:13 PM   #7
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Quote:
Originally Posted by kboles89

According to my scanner it does. If it does it should be on the driverside firewall to the right of the master cylinder.
Ok, there's a "plug" looking thing on the drivers side under the hood... Could that be it?
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Old 03-09-2012, 10:28 PM   #8
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Quote:
Originally Posted by tinkerbob
Taking it to a shop is a last resort. My limited disability income does not allow for such luxuries.
The person i got it from had it in a shop $300 later no better. Not a good shop!!!
The previous owner changed the distributor, fuel pump, plugs, cap, rotr, wires, map sensor, and a couple more sensors under the hood. no luck.
Tomorrow is supposed to be above 30 degrees out maybe i will chk a few vac lines and the egr valve.
Thanks for the input guys.
Find a good NON FRANCHISE shop and they might look at the data for free. At our shop we don't charge to check car out and pull codes, and if someone just needs help usually we will help them out. I know we aren't the only ones out there who will help someone out. I would seriously check the coolant temp sensor and cam/crank sync.
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Old 03-09-2012, 10:29 PM   #9
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Quote:
Originally Posted by MickeYJ

Ok, there's a "plug" looking thing on the drivers side under the hood... Could that be it?
Lol it looks like a fat "L". If I can remember, I'll take a pic once I get off work.
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Old 03-10-2012, 05:59 PM   #10
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thanks


Thanks kboles89 i was just informed of an auto parts store in town that will check it for nothing.
Also a local mech supposed to be top notch will check it for $25.
thanks for your help
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Old 03-10-2012, 06:33 PM   #11
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Well I came back from mechanic and nothing.... He can't find anything wrong, he can't duplicate the problem. I even drove it with him next to me and nothing
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Old 03-10-2012, 11:21 PM   #12
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Quote:
Originally Posted by MickeYJ
Well I came back from mechanic and nothing.... He can't find anything wrong, he can't duplicate the problem. I even drove it with him next to me and nothing
Gah! I hate when that happens, does something all the time then the minute you take it in it doesn't do it at all then as soon as you get it home it starts again. Been there, done that. Lol
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Old 03-11-2012, 08:22 PM   #13
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EGR Valve

Hey whats the deal. I have no EGR valve on my 1994 Wrangler 4.0L MPI.
Is this normal?? Or did someone remove it?

I still have the miss. I changed the coolant temp sensor, intake air temp sensor, fuel pump pressure regulator, plugs, cap, rotor, wires, and air in the tires.
When cold it misses, backfires and chugs.
Slightly warmed up to warm it runs like a champ.
Warmed up to operating temp it will miss about 6-8 times in a 3 mile run.
I am gona take it in sometime next week and let u know what the guy tells me. This guy has a electrical problem rep in the area.
Hope he can help.
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Old 03-11-2012, 08:31 PM   #14
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It sure sounds like a fuel or vacuum leak somewhere if all sensors are good....Have you checked the intake manifold for cracks and leaks and also the injectors
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Old 03-11-2012, 08:45 PM   #15
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Try to check the grounding and the distributor cap for mousture,
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Old 03-12-2012, 10:45 PM   #16
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Quote:
Originally Posted by MickeYJ
Well I came back from mechanic and nothing.... He can't find anything wrong, he can't duplicate the problem. I even drove it with him next to me and nothing
Lol common, customers swear it does it every time. I ride with them then nothing.
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Old 03-12-2012, 10:47 PM   #17
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Quote:
Originally Posted by tinkerbob
Hey whats the deal. I have no EGR valve on my 1994 Wrangler 4.0L MPI.
Is this normal?? Or did someone remove it?
I was waiting for that! They don't have one :-)
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Old 03-12-2012, 10:50 PM   #18
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The issues you both are talking about make me wonder if it's the crank sensor. They commonly go out and most if the time they don't through a code. Could even be the can sensor but it's really rare. Btw, I ride around with a spare crank sensor.
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Old 03-12-2012, 11:50 PM   #19
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tinkerbob, I think it could be the MAT (manifold air temperature) sensor. Given the fact that seems to be temperature related and it only works in a certain time/temp frame, this could likely be the culprit.
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Old 03-13-2012, 05:00 PM   #20
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my my my

I have changed the mat sensor, distributor cap, rotor and wires, plugs, coil, water temp sensor, distributor module, the fuel pump, and i have a map sensor, throttle position sensor and idle speed motor on the way.
There is no EGR valve on it so crank position sensor and anti knock sensor is all that is left.
Computer??? oooofff
thanks bob

PS......I changed the radiator and air in the tires too.
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Old 03-14-2012, 09:34 AM   #21
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Quote:
Originally Posted by kboles89

Lol it looks like a fat "L". If I can remember, I'll take a pic once I get off work.
I forgot... This is off of a dodge ram but it looks like this.

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Old 03-14-2012, 01:11 PM   #22
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Quote:
Originally Posted by kboles89

I forgot... This is off of a dodge ram but it looks like this.
Wait... What's that connection called? I have one of those n my YJ n the engine compartment drivers side in the corner. I thought it was to plug in the faulted code reader thing... But the mechanic said it wasn't
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Old 03-14-2012, 01:17 PM   #23
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I replaced my TPS myself on Sunday and my YJ Has been working great since! No more hesitation or anything. Keep in mind I did read the codes by using the "switch on, off, on, off, on-method" and it didn't send the TPS error code but I still went ahead and replaced it anyways. U should try that
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Old 03-14-2012, 05:16 PM   #24
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Quote:
Originally Posted by MickeYJ

Wait... What's that connection called? I have one of those n my YJ n the engine compartment drivers side in the corner. I thought it was to plug in the faulted code reader thing... But the mechanic said it wasn't
That is the "obd-1 diagnostic link connector." It is used to pull codes and it is to the right of the master cylinder. A tps will cause hesitation but I've never seen one cause a miss. I guess in his case, he'll just have to keep throwing parts, until he find someone familiar with older chrysler drivetrains.
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Old 03-14-2012, 05:23 PM   #25
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Quote:
Originally Posted by kboles89

That is the "obd-1 diagnostic link connector." It is used to pull codes and it is to the right of the master cylinder. A tps will cause hesitation but I've never seen one cause a miss. I guess in his case, he'll just have to keep throwing parts, until he find someone familiar with older chrysler drivetrains.
What the heck... The mechanic didn't even know what that was and I suggested it was for codes!!!!

But thankfully I found another way to get them

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