[Krashed989]

A surginess while driving is usually caused by a dirty ISC valve right?

I just wanted to make sure before I take it apart and clean it.

 

[Ranger]

No. When you are driving, you have your foot on the accelerator so the throttle lever is not resting on the ISC motor plunger, unless you are decelerating or coarse. Surging while driving sounds more like a vacuum leak.

 

[Krashed989]

I don't think it's a vacuum leak. It only does it when I have my foot on the accellerator to maintain a steady speed. Also it only does it towards the beggining of the drive after the car has been sitting for a while. After the car has been on the road for like 10 minutes or so, it goes away. The surges are about 100 to 200 rpms when it does it. Sometimes the car, when it's sitting at idle directly after having the surges, will drop its idle speed to where it almost dies, but then it raises it back up to 700 and there's no problem after that. There aren't any codes.

Could it be EGR valve?

 

[91TexasSeville]

Egr

 

[Eldyfig]

You could be getting too much egr.Try pulling the egr valve out and cleaning it. It is a simple process and takes little time. Do you know what to do?

It could be possible the pintle is getting out of range but not enough to trip a code.

If you go into pcm data, PD07, this is what you should have:

Ignition on, Engine off...44
At idle...44
At WOT...44
Partial throttle...number rises

 

[Krashed989]

Do you know what to do?

Well I could figure out how to take it off and all, but Is there anything to watch out for when I clean it? and What deturgent would you recommend to clean it with?

Ohh yeah, the PD07 thing,
engine off = 50
idle = 50
WOT = 50
Every rpm in between = either 50 or 51
LOL

Thank you.

 

[Ranger]

Use good ole Gumout carb cleaner or equivlent . DO NOT hold it upside down when cleaning the pintle or shaft. You don't want the carb cleaner to run into the "can". It will destroy the insulation on the windings.

 

[91TexasSeville]

Yeah, any carburetor/fuel injector cleaner is sufficient, and yes as Ranger pointed out, handle with care.

 

[Eldyfig]

After you get it cleaned and back in, recheck those signals. At idle and wot, egr should be very minimal.