351w nightmare
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Junior User
Joined: Sep 2012
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351w nightmare
I've been having a lot of issues with my 91 351w. It has a new map sensor, idle air sensor, throttle position sensor, egr valve, vacuum lines, plugs, fuel filter, fuel pressure regulator, and still idles rough. Also it will buck down the road on occasion. I'm gonna try a pcv valve next. Everyone I talk to is stumped over it. It throws a light sparatically as well. Any ideas?
Fleet Owner
Joined: Oct 2005
Posts: 20,786
Likes: 1,751
From: Kentucky
I've been having a lot of issues with my 91 351w. It has a new map sensor, idle air sensor, throttle position sensor, egr valve, vacuum lines, plugs, fuel filter, fuel pressure regulator, and still idles rough. Also it will buck down the road on occasion. I'm gonna try a pcv valve next. Everyone I talk to is stumped over it. It throws a light sparatically as well. Any ideas?
Fleet Owner
Joined: Oct 2005
Posts: 20,786
Likes: 1,751
From: Kentucky
Fleet Owner
Joined: Oct 2005
Posts: 20,786
Likes: 1,751
From: Kentucky
And it comes with a book of code definitions. We can help you with that as well.
Some parts stores used to read OBD-I codes for free, but I think that is getting tougher to find. As far as a dealer, they may be able to but I would bet they may charge you for it or insist they get to fix the issue. Only a guess on my part.
Reading codes from flashes is not as bad as it may seem. It is the cheapest method going and the most reliable. Some folks report problems retrieving the codes using a reader. Most of the time it ends up being caused by corroded pins on the diagnostic data port. Easily resolved, but just a forewarning of what could happen.
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Junior User
Joined: Sep 2012
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Well I'm going to buy one of these. It seems like a good 30$ to spend and could save a lot of headache. Plus I know a lot of people that I could help with it. I'm ok with the risk of it not being right.
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Junior User
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I bought one of those code readers and it does come with a Code book also. The best Money I have spent on my 93F150
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Fleet Owner
Joined: Oct 2005
Posts: 20,786
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From: Kentucky
Each code has a definition assigned to it, but the exact definition can (and usually does) change depending on when they were displayed (Key On Engine Off, Continuous Memory, Key On Engine Running).
As far as how accurate they are is also dependent on the root cause. The displayed Code is the result of an improper input to the PCM. This code is what the PCM THINKS is the issue. It's a great start to narrow down the problem and root cause, but it is not intuitive enough to know whether the flagged code is a bad sensor or open wire or ??
As far as how accurate they are is also dependent on the root cause. The displayed Code is the result of an improper input to the PCM. This code is what the PCM THINKS is the issue. It's a great start to narrow down the problem and root cause, but it is not intuitive enough to know whether the flagged code is a bad sensor or open wire or ??
