Surging?

[Technick]

Something to think about: if the engine has a lot of miles on it, the problem could be caused by the build up of carbon on the back of the intake valves. When started up the carbon "absorbs" some of the fuel and thus the engine goes lean untill the carbon is saturated with fuel. Once the engine is hot and then is allowed to sit for some time the fuel will evaporate off of the carbon and the process starts all over again. Sounds strange but it does happen. And it may not be the case here, but it is a possibility.

[my9250GT]

my 90 did the same thing...remove and clean your throtle body real good that fixed mine up...no more surges

[jruppert]

I know this sounds crazy but it works. Get your engine good and hot, and remove a vacuum line going to your intake. Take the line and slowly stick it in some break fluid. Rev the engine so it doesnt stall and do this repeatedly. Let the engine sit for around 10 minutes off. Start it up and go drive it. Brake fluid works great for removing a lot of carbon deposits inside the intake, etc. I read this off a web site on Mustangs and tried it myself.

[Sicy Stang]

My car has 130,000 miles on it. I'm not sure what kind of computer it has.. ? It's an LX 5.0 '88. The only modifications I've made to it is putting after market headers and exhaust (h-pipe).

I wish I could clean my throttle body myself. I'm sure its not that difficult, but I'm the type of person that feels much better having mechanic do it. I will mention this to them when I bring the car in. I found some guys that know Fords.

I did change my oil pressure sending unit by myself once *applaud*

[Sicy Stang]

Originally posted by jruppert
I know this sounds crazy but it works. Get your engine good and hot, and remove a vacuum line going to your intake. Take the line and slowly stick it in some break fluid. Rev the engine so it doesnt stall and do this repeatedly. Let the engine sit for around 10 minutes off. Start it up and go drive it. Brake fluid works great for removing a lot of carbon deposits inside the intake, etc. I read this off a web site on Mustangs and tried it myself.

Wow LOL.. that sounds eh... interesting!

[Sicy Stang]

Ok my car is at the shop. They just called me. It was indeed the Idle control valve that went bad and apparently was covered in carbon So........ they're going to change that and also do a complete maintenance cleaning of the throttle body, and something about the fuel rail something or other.. in any case everything will be de-carbonized and they said my car should run stronger and have more power.

Its going to cost a lot but I couldnt have done it myself.

Thanks everyone for your help.
And I apologize to 8ursup for hijacking his thread

[jruppert]

The fuel rail is the shiny polished metal strip that runs along both sides of the lower intake. Your fuel injectors are held into the lower intake with this. The fuel pressure regulator, which is the round canistor located towards the back of the intake, is also mounted on the fuel rail.

[Sicy Stang]

Thanks. I have a feeling I'm going to learn a lot about my car on this forum!

[Sicy Stang]

My car runs so lurvvvly now

I can totally tell the difference. They said my throttle body and injectors were just caked with gunk. And this strange noise it used to make when I let off the gas is GONE. I cant believe it.