92 f150 HELP
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Joined: Mar 2011
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92 f150 HELP
I bought a 1992 f150 engine 5.8
And now coming into some problems. Here we go first when starting up it idles high even after driving for awhile I turn it off and start back up and it still idles high for a minute then it goes back down.
When driving coming to a stop it feels like it had a misfire and it's becoming annoying I thought I get use to it but 6 months later no luck. Now this next issue it seems to get worst, when I try to floor it or even try to pass up an old folk on freeway truck won't go anywhere it seems as I am towing. What I did notice it has some strong exhaust fumes when in park.
Any help greatly appreciated and sorry for the long boring story.
And now coming into some problems. Here we go first when starting up it idles high even after driving for awhile I turn it off and start back up and it still idles high for a minute then it goes back down.
When driving coming to a stop it feels like it had a misfire and it's becoming annoying I thought I get use to it but 6 months later no luck. Now this next issue it seems to get worst, when I try to floor it or even try to pass up an old folk on freeway truck won't go anywhere it seems as I am towing. What I did notice it has some strong exhaust fumes when in park.
Any help greatly appreciated and sorry for the long boring story.
Senior Member
Joined: Jul 2008
Posts: 58,557
Likes: 1,165
From: Long Beach Calimexifornia
Probably a couple things going on. Your job, should you chose to accept it, is figure out what they are. I would buy a fuel pressure gauge to check fuel pressure at the fuel rail, & a OBD1 code Reader to find sensors that may be pooched or out of range.
Then there's "the quality of maintenance/ upkeep (or lack thereof). Last time tuned, condition of ignition system components, checked for Vac leaks, IAC & EGR cleaned?
OBD1 code reader ($22.77):http://www.handsontools.com/Equus-In...ol_p_5574.html
Cleaning your IAC (elbow grease/ some say afterward: Priceless!)
Then there's "the quality of maintenance/ upkeep (or lack thereof). Last time tuned, condition of ignition system components, checked for Vac leaks, IAC & EGR cleaned?
OBD1 code reader ($22.77):http://www.handsontools.com/Equus-In...ol_p_5574.html
Cleaning your IAC (elbow grease/ some say afterward: Priceless!)
Last edited by ymeski56; Mar 10, 2011 at 12:54 PM.
IJK
Joined: Oct 2010
Posts: 102
Likes: 2
From: Carlisle, Pa
cats do get clogged overtime, but the chances of that are kinda slim
check all your sparkplug wires at the cap and plugs
i recently swaped a 5speed into my 89 and when taking the auto tranny out a plug wire came undone and i didnt know it took it for a drive and when i would floor it, it went no where and my stock manifolds actually got bright red
the high idle problem is most likely the iac either clean or replace it
other than that i cant really help you much and
check all your sparkplug wires at the cap and plugs
i recently swaped a 5speed into my 89 and when taking the auto tranny out a plug wire came undone and i didnt know it took it for a drive and when i would floor it, it went no where and my stock manifolds actually got bright red
the high idle problem is most likely the iac either clean or replace it
other than that i cant really help you much and
Senior Member
Joined: Jul 2008
Posts: 58,557
Likes: 1,165
From: Long Beach Calimexifornia
You can take a remove the O2 ahead of the cat & take a pressure read. I believe over 3 psi is considered "back pressured". The problem is usually worse after norm op temp is reached.
You can temporarily remove the senor & drive w/ it out. It will trigger a CEL, but would relieve any back pressure condition while it's out.
Last edited by ymeski56; Mar 18, 2011 at 07:36 AM.