Ford Mustang Forum banner

Status
Not open for further replies.
1 - 11 of 11 Posts

·
Registered
Joined
·
16 Posts
Discussion Starter #1
like the title says, i've got a 92 lx 5.0 5 speed. it wants to die out when i first start it cold. and the idle jumps around from about 500 to 1500 till its warm. then it idles very rought like it's got a cam. but its bone stock with just basic bolt on's. and when im cruising below say 2500 rpm in any gear it bucks and when i let off the gas still in gear it gets even worse. any idea what it could be?
 

·
Registered
Joined
·
1,520 Posts
When was ur last tune up? Sounds like you need some idle control cleaning, and maybe some tps setting, with a side of timing. May wanna start with fuel filter first and work up from there. What r ur bolt ons?
 

·
Registered
Joined
·
16 Posts
Discussion Starter #4
I gave it a tune-up about 4k miles ago. fuel filters less miles than that. timings set to 12*. the problem only started a couple days ago. bolts are shorty headers, off road hpipe, underdrive pulleys, bbk fender intake. also all the tune up parts are msd. it has autolite 25's gapped to .045. i guess ill start by cleaning some sensors.
 

·
Registered
Joined
·
5,170 Posts
I gave it a tune-up about 4k miles ago. fuel filters less miles than that. timings set to 12*. the problem only started a couple days ago. bolts are shorty headers, off road hpipe, underdrive pulleys, bbk fender intake. also all the tune up parts are msd. it has autolite 25's gapped to .045. i guess ill start by cleaning some sensors.
Run the codes first PLEASE!! Nothing wrong with cleaning sensors, but dont get side tracked, from the most important part of diagnosing problems such as yours. Codes are free to do, and only take a small amount of time. If anything the codes will help you figure out what sensors to try and clean.
 

·
Registered
Joined
·
16 Posts
Discussion Starter #6
sorry to keep sounding stupid. i've never really worked with any computer controlled cars till this one. can i look up the same codes with a scanner? i have access to a few.
 

·
Registered
Joined
·
5,170 Posts
You can use the scanner if you choose. But the link I provided is REAL simple. JUMPER and a TEST LIGHT. Hardly gets any simpler than that, as far a elctronics goes. But I have seen where scanners have not been so acurate at times. If you use the link i gave, just make sure you dont use the Hood light terminal. :bigthumbsup
 

·
Registered
Joined
·
9 Posts
Also, you may want to check out your "salt and pepper" shakers - the black and white ten-pin connectors located on the back of your upper intake manifold. Cleaning these with a pick, electrical cleaner and some dielectric grease did me wonders and I was having a very similar problem.

While you're at it, you may want to use a pick to open up the male pins a bit to make the connection a bit tighter. Hope this helps! :bigthumbsup
 

·
Registered
Joined
·
5,170 Posts
Also, you may want to check out your "salt and pepper" shakers - the black and white ten-pin connectors located on the back of your upper intake manifold. Cleaning these with a pick, electrical cleaner and some dielectric grease did me wonders and I was having a very similar problem.

While you're at it, you may want to use a pick to open up the male pins a bit to make the connection a bit tighter. Hope this helps! :bigthumbsup
Very Good Suggestion:bigthumbsup
 

·
Registered
Joined
·
224 Posts
Ive got a 92 lx 5.0 5 speed mine did the same thing it was a vacuum hose underneath the upper intake had a huge hole i fixed it and it ran better than ever.
 

·
Banned
Joined
·
96 Posts
Like 89coupe said.... start with codes.... while you have the hood open double check for visual problems....
harnesses unplugged, cracked vac lines, etc.
 
1 - 11 of 11 Posts
Status
Not open for further replies.
Top