HELP!!!
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Trailering
Joined: Nov 2005
Posts: 22
Likes: 0
From: Hitchcock, Texas
HELP!!!
I am having problems with my 1991 Ford F150. It has the 5.0 L engine with I believe the C6 automatic. A few days ago the truck started running badly along with stalling and shutting off. This problem did not start gradually. One day it is running great, the next it was running terrible. I did not introduce new fuel into the fuel tank so it is not a contaminated fuel problem. I did replace the fuel filter thinking that was the problem. No go. Still runs like crap. BUT, yesterday it ran fine for about 3 hours then went back to running like crap. The poor running also affects how the transmission shifts. When it is running good the transmission shifts flawlessly. When it is running bad, the transmission will upshift, BUT it slams into each gear. Also balack smoke comes out of the exhaust when it is running poorly. Here are the basic symptoms.
1. Idles rough and stalls and runs badly and stalls, and very, very hard to get started once it is warmed up.
2. Transmission slams into each gear as it upshifts when it is running badly. Shifts
fine when it is running well.
3. Problem is intermittent at this time but is getting progressively worse.
Any help would be greatly appreciated.
Thanks, Thomas
1. Idles rough and stalls and runs badly and stalls, and very, very hard to get started once it is warmed up.
2. Transmission slams into each gear as it upshifts when it is running badly. Shifts
fine when it is running well.
3. Problem is intermittent at this time but is getting progressively worse.
Any help would be greatly appreciated.
Thanks, Thomas
Lead Driver
Joined: Aug 2006
Posts: 5,670
Likes: 13
From: Sand Lake, MI
Couple quick thoughts/guesses based on what you stated so far,
MAP sensor failing or vac supply to it.
EGR valve hanging open, depend on when problem starts.
As suggested check it for trouble codes, first best place to start.
C6? Usually unaffected by most engine running issues. Your symptoms, sound more like that of a E4OD.
MAP sensor failing or vac supply to it.
EGR valve hanging open, depend on when problem starts.
As suggested check it for trouble codes, first best place to start.
C6? Usually unaffected by most engine running issues. Your symptoms, sound more like that of a E4OD.
Thread Starter
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Trailering
Joined: Nov 2005
Posts: 22
Likes: 0
From: Hitchcock, Texas
danr1
Engine light does not come on so I can't "hotwire" the computer to get codes. Need to find out why the engine light does not come on also. Thanks, I will check those items for operation especially the vacuum to the MAP sensor. Will get back with you about possible solution.
Engine light does not come on so I can't "hotwire" the computer to get codes. Need to find out why the engine light does not come on also. Thanks, I will check those items for operation especially the vacuum to the MAP sensor. Will get back with you about possible solution.
Der Postmeister
Joined: Sep 2006
Posts: 6,859
Likes: 560
From: Long Beach, Calimexiforia
danr1
Engine light does not come on so I can't "hotwire" the computer to get codes. Need to find out why the engine light does not come on also. Thanks, I will check those items for operation especially the vacuum to the MAP sensor. Will get back with you about possible solution.
Engine light does not come on so I can't "hotwire" the computer to get codes. Need to find out why the engine light does not come on also. Thanks, I will check those items for operation especially the vacuum to the MAP sensor. Will get back with you about possible solution.
You can do the codes manually w/ a meter How-To: retrieve trouble codes- OBDI - Ford F150 Forum - Community of Ford Truck Fans
Or p/u one of these for $22.Equus Innova 3145 OBD-I Ford Scan Tool
W/o your error codes, you will be chasing a very expensive tail!
Lead Driver
Joined: Aug 2006
Posts: 5,670
Likes: 13
From: Sand Lake, MI
danr1
Engine light does not come on so I can't "hotwire" the computer to get codes. Need to find out why the engine light does not come on also. Thanks, I will check those items for operation especially the vacuum to the MAP sensor. Will get back with you about possible solution.
Engine light does not come on so I can't "hotwire" the computer to get codes. Need to find out why the engine light does not come on also. Thanks, I will check those items for operation especially the vacuum to the MAP sensor. Will get back with you about possible solution.
The check engine light doesn't have to be on for it to have codes stored.
That and running the first test, KOEO (Key on, engine off) is one of the best ways to find a problems, CM codes stored or not.
After that test the CM, (Continues Memory) codes that have been stored are displayed (flashed). It could have several CM codes stored and never light the light.
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Freshman User
Joined: Mar 2009
Posts: 48
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sounds suspiciously like a tps on the way out to me.
does it run rough at highway speeds? if it smooths out at highway speeds it could be the egr sticking open slightly.
does it run rough at highway speeds? if it smooths out at highway speeds it could be the egr sticking open slightly.
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Der Postmeister
Joined: Sep 2006
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From: Long Beach, Calimexiforia
You can call around town & find them, or order one from the link. The cable shown is not required but does allow you to do the scans sitting in the drivers seat, instead of bent over the fender well. That's the only brand/ model in that price range that's digital display w/ memory. After 4 years, I finally had to change the battery in mine.
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