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Old 12-04-2003, 05:10 PM
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Erratic Running Engine

I am in hopes I am posting in the correct folder for this question. I will post it in the electrical section also. My problem is that I have a 92 t-bird with a 5.0 in it, it runs great and revs fine but it stumbles and will not accelerate when under a load. i have changed the ignition module, tps, fuelpump, regulator, computer, plugs, wires, cap, and rotor. i will try the distributor next but what else could cause the car not to run correctly under a load. thankyou for your help

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Old 12-04-2003, 05:19 PM
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I think it is a fuel related problem.
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Old 12-04-2003, 05:43 PM
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i have a new 255 walbro pump and new ford regulator i have a pressure gauge on the engine and it is between 40 and 45 psi even when running erratic
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Old 12-04-2003, 05:52 PM
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Man I wish I could help. I don`t know Fords or Fuel injected but it really seems to be fuel related.

I`m looking forward to viewing this post with someone that does know what it is.

Good luck.
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Old 12-05-2003, 04:18 AM
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I believe that on the '92 you can still use a code scanner. They are available at Kragen, or whatever popular auto parts place in your area. It sounds to me like maybe the mass airflow sensor or the equivalent on your year model. If it is, the code scanner will pick it up, and scan all the other engine sensors for faults. The '92 probably has at least 5 sensors, of which you have already replaced one, the TPS. But the scanner will save you trouble. Make sure you get the correct one for your car, they go by year/make/model.

Good luck!
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Old 12-05-2003, 08:11 AM
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I would check the O2 sensor first.
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Old 12-05-2003, 01:59 PM
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Could be of any 200 items. If you can't isolate problems Then take it to a pro. Stop wasting your time and money and getting no where fast.
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Old 12-05-2003, 04:04 PM
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i am not familiar with this type of car, but does it have an EGR valve? i just read an article from the latest "Best of Tech" magazine and it explained that an improperly working EGR valve can be a problem with hesitation and part throttle problems. the spring inside of the valve can wear out causing more exhaust gasses to blend inside of the intake manifold. an easy test to perform is to unplug the EGR valve and plug the vacum line going to the carb, and see if your problem goes away.

like i said before, i am not sure if your car has one or not, but it is a cheap and easy fix that you can diagnose for free.

good luck!
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Old 12-08-2003, 02:12 PM
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Quote:
Originally posted by Auto-Part
Could be of any 200 items. If you can't isolate problems Then take it to a pro. Stop wasting your time and money and getting no where fast.
Auto-Fart you are an insane moron.

I have been having similar problems with my 5.0 Mustang. A full diagnostic revealed nothing as far as the car's computer is concerned. A dyed in the wool Mustanger friend thinks it's the air bypass valve because sometimes it idles erratically. The engine studders a little on accelaration too, almost to the point it feels like clutch chatter. As far as I know there are only a couple of things other than a massive air-leak that can wreak havock on these Fuel injected engines. A bad TPS, egr, air-bypass valve, o2 sensor. Sometimes you just have to start throwing parts at it until it gets fixed as in my case the Computer does not recognize a failure. Mine does not do it all the time either which is why I have tolerated it for over a year.

Last edited by Goldduster360; 12-08-2003 at 02:12 PM.
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Old 12-08-2003, 08:21 PM
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Quote:
Originally posted by Goldduster360
Auto-Fart you are an insane moron.

I have been having similar problems with my 5.0 Mustang. A full diagnostic revealed nothing as far as the car's computer is concerned. A dyed in the wool Mustanger friend thinks it's the air bypass valve because sometimes it idles erratically. The engine studders a little on accelaration too, almost to the point it feels like clutch chatter. As far as I know there are only a couple of things other than a massive air-leak that can wreak havock on these Fuel injected engines. A bad TPS, egr, air-bypass valve, o2 sensor. Sometimes you just have to start throwing parts at it until it gets fixed as in my case the Computer does not recognize a failure. Mine does not do it all the time either which is why I have tolerated it for over a year.
If it doesn't do it all the time then it is a good chances it is your computer. Best way to check computer problems is remove the computer from it's mounting keeping the wiring harness hooked-up Now start the engine with your hand smack the computer if the engine runs rough then you have a cracked circuit board. Give it a shot costs nothing this will fix 50% of computer problems
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Old 12-08-2003, 08:23 PM
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check the maf
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Old 12-08-2003, 08:24 PM
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Quote:
Originally posted by Auto-Part
If it doesn't do it all the time then it is a good chances it is your computer. Best way to check computer problems is remove the computer from it's mounting keeping the wiring harness hooked-up Now start the engine with your hand smack the computer if the engine runs rough then you have a cracked circuit board. Give it a shot costs nothing this will fix 50% of computer problems
I am going to have to through away my Fluke meter now and start "smacking" everything. You must be getting bored Auto-Loser.
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Old 12-08-2003, 08:27 PM
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i also did not know smacking a computer fixes it.
i have alot of rust on my car will a little smackage fix that??
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Old 12-08-2003, 08:42 PM
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Quote:
Originally posted by lluciano77
I am going to have to through away my Fluke meter now and start "smacking" everything. You must be getting bored Auto-Loser.
So how do you check a printed circuit board with a Fluke multi-meter dude
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Old 12-08-2003, 08:45 PM
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you check a circut like a d battery stick your tongue on it.
smacking a computer can (and i say can) reveal a computer problem but it wont fix it i know thats not what you meant but thats what you typed
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