Truck running rough - HELP PLEASE

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Jul 22, 2010 | 01:30 AM

harcracing

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From: Goshen, Ohio

Truck running rough - HELP PLEASE

A couple months ago my truck started to run rough. I have changed the plugs, O2, but still running bad. Sputters, dies out, but starts right back up (that is why I don't think it is the fuel filter). Idles eratic (sp?). Could this be the EGR? Also not sure if this is a coincidence but right before we spliced the tail lights to add a pigtail for a trailer it ran great. Then RIGHT after, I mean as soon as we were done and I started it up to go home, this crap happened. I checked the ground and seems like a good connection. Should I redo the wiring back and buy an adaptor kit for the pigtail instead?

Thanks for the help folks,
Rob

Jul 22, 2010 | 03:11 PM

jplinville

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From: Ohio

I'd undo the wiring...

Jul 22, 2010 | 11:13 PM

Jasonsb1980

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try cleaning the throttle sensor (brake/carb cleaner) but be careful for the electronic part not to get wet and short it out. worked for me anyway, I'd be at a stop light and idle would go up and down and when i started it it would idle low.

Jul 23, 2010 | 08:26 AM

rla2005

Fleet Owner

Joined: Oct 2005

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From: Kentucky

Jason, I assume you are referring to the Idle Air Controller (IAC/IAB)? It can be cleaned, but that is usually a short term fix. It is a great way to confirm that is the problem, but in the long run it will most likely need replaced.

For reference from Ford Fuel Injection: Ford Fuel Injection Idle Air Bypass (IAB) aka IAC

Jul 24, 2010 | 08:35 AM

Jasonsb1980

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Quote:

Originally Posted by rla2005

Your right, Ive had to do this twice so far but if you dont have the cash you can go 2-3 months without having to do it again and only takes bout 10 minutes so.

Jul 26, 2010 | 04:24 PM

harcracing

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From: Goshen, Ohio

I will give those ideas a try. Thank you. I will be back in a couple to let you know

Jul 28, 2010 | 01:53 AM

harcracing

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From: Goshen, Ohio

Well, cleaned the tps. Although it does seem to idle better it is still hesitating bad and seems to has a miss to it. Could this be caused by the EGR? Can I clean the EGR? Those darn things are expensive. The check engine light comes on and goes off. It is a 1991 so no one around me can read the codes.

Think I may undo the pigtail and rewire the lights the way they are supposed to be and get the adapter kit for it.

Thanks again. Any help is appriciated!