surging problem, please help!
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New User
Joined: Jul 2003
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surging problem, please help!
I have a 1993 F-150, 302 v-8 engine. The engine idle is surging up and down. I have not been able to find the problem. If anyone can give some advice on fixing this problem, please respond
Senior User
Joined: Jan 2000
Posts: 354
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From: Irving Texas
surging problem, please help!
Is the problem at idle ?
Is your idle changing a few RPM or is it going way up and down.
My did than until I upped the idle a little. Found out why :
Aged / Clogged fuel injectors.
Or of course the usually answer is a vaccum leak.
If your vaccum lines are those red hose stuff, you proably have a leak.
You look at those red hoses they break.
Is your idle changing a few RPM or is it going way up and down.
My did than until I upped the idle a little. Found out why :
Aged / Clogged fuel injectors.
Or of course the usually answer is a vaccum leak.
If your vaccum lines are those red hose stuff, you proably have a leak.
You look at those red hoses they break.
New User
Joined: Jul 2003
Posts: 13
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From: Alaska
surging problem, please help!
My '93 does the same thing as she starts. After a few minutes she idles better. I do hear what sounds like a vaccuum leak from right around the the fuel injector/carb thing on the top of the engine. Maybe I have a leak causing the same problem?
Not sure yet where the vaccuum lines are.
Not sure yet where the vaccuum lines are.
Senior User
Joined: Jan 2000
Posts: 354
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From: Irving Texas
surging problem, please help!
That sounds like the place where the vaccum switchs are for emissions.
I replace my EGR vaccum switch and it does that all the time.
Sounds like someone whislting under the hood.
I replace my EGR vaccum switch and it does that all the time.
Sounds like someone whislting under the hood.
Thread Starter
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New User
Joined: Jul 2003
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surging problem, please help!
I checked all vaccum lines and went through everthing, and can't find any vaccum leaks. Its running lean, and drinking to much gas. I bought this truck for my daughter. It appears to have a lot of parts replaced, such as all sensors. I am thinking it's the computer.
Post Fiend
Joined: Nov 2002
Posts: 9,987
Likes: 7
From: Memphis, TN
surging problem, please help!
smitty
The EEC is one of the most reliable parts on the truck, so it's unlikely that it's the problem. Always start by pulling the codes and looking up the definitions. But don't just start replacing parts that are mentioned in the definitions; diagnose those circuits according to the instructions in the Haynes manual and find out what the problem is. It's often just a vacuum leak or a loose wire.
prauch
That's the "throttle body" on top of the engine, and they sometimes leak, but not often. Look through the "General Purpose Pics" photos in my signature link and you can learn a LOT of the names for the parts on your engine. There are vacuum lines all over it, and there's a map to them on a sticker in your engine bay, probably on the hood.
The EEC is one of the most reliable parts on the truck, so it's unlikely that it's the problem. Always start by pulling the codes and looking up the definitions. But don't just start replacing parts that are mentioned in the definitions; diagnose those circuits according to the instructions in the Haynes manual and find out what the problem is. It's often just a vacuum leak or a loose wire.
prauch
That's the "throttle body" on top of the engine, and they sometimes leak, but not often. Look through the "General Purpose Pics" photos in my signature link and you can learn a LOT of the names for the parts on your engine. There are vacuum lines all over it, and there's a map to them on a sticker in your engine bay, probably on the hood.
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Posting Guru
Joined: Jul 2003
Posts: 2,232
Likes: 1
From: Colville, Washington
surging problem, please help!
Another common problem that causes a surging idle is a dirty IAC-idle air control- motor. It's fastened to the side of the throttle valve assembly and has a small wiring connector. It can be removed and cleaned, but make sure you DON'T let the cleaner into the motor end- just clean the valve end.
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