Surging, irregular idle, random no power on accelaration

[Claude]

yeah i was referring to the sock on the pump but more specifically the gas tank itself corroding, which wont neccessarily mean the sock is an issue just the crud in the tank. i got a new tank on the way cus that shiz was just too hard to get out and when i did it just built up more, tried seafoam any additive there was and also manually removed the crud but i just had to bite it and get a new tank. also if you do drain your tank and can feel around to see any black or brownish gunk like hard little rust deposits then im pretty sure u have the same problem i do but i havent read this whole thread so sorry if this is a pointless post. lol

[Kofkof_00]

I replaced the plugs & I got some enjoyment out of it... Took a lot longer to happen again.

But it did. I'm going to try the distributor (the sensor in it) this weekend.

[1988redfordfestiva]

thanks my car does this from time to time i'm gona pull the sending unit out when my new one comes from korea and i'm gona check my tank i might just buy a new one

[Kofkof_00]

Sooo.... known good dist, still does it. Also changed the two electrical gizmo's by the coil for known good ones, still does it.

Going to try the ECU next. Then the fuel pump (argh)

[ericsmith32]

Your going to have a new car when you're done! I had a problem similiar to yours in a S10 and it was the ECU.. even though I got a new one from Autozone and it didn't help. The one from Chevy itself though fixed it. My old 91 Festiva had a similiar problem also but never figured out what caused it just went away!

[resuwrecked]

So have you done anything about your IAC yet? Unplug it, see if it has a stable idle then.

[Kofkof_00]

I have a kg ecu. That's what I'm trying next. After that it's the fuel pump / fuel tank sludge.

After that... IAC?

[Kofkof_00]

Known good ECU.

What
a
pain!

I installed it, been testing the car all weekend.



fail.

It's not the ecu.

[Kofkof_00]

Not the IAC.


Going to try the fuel pump, and inspect for rust at the bottom.

[Ephet]

Please let me know if you figure anything out mine does the same thing but once its stails out i cant start it for a while and i did note a a very rich smell when my Festiva stailed out.

[Kofkof_00]

I plan on updating this thread with everything I try. :S

[scitzz]

A loose TPS can cause this, without being bad. Check to be sure it is tight. Check the values as described before. A simple adjustment could be all that is needed. Mine has over 600K, rapidly approaching 650K, and still works fine.

I have been having a similar problem that I am working on right now, the O-Ring on one of my fuel injectors is bad. One cylinder is not firing. Wait for the problem to start, then, let it run at an idle. Disconnect one spark plug wire at a time. If the idle does NOT change when any one of them are removed, report back!

If the idle changes for each, the problem is probably not there.

Disconnect the Vaf at the air filter while running. Does the idle change? Mine will stall if this is done...

My main concern is that you are spending tons of money, and the fix has not been found! RE your earlier post, just replacing sensors and parts until the problem is fixed is EXPENSIVE! Note my tag line, diagnose, THEN replace

Please feel free to call me as well! You can PM me for my number....

[Ephet]

ok so i figured out what was causing my Festiva to run the way it was, it is this censor in between fuel injectors one and two. i disconected it and now the car runs fine,idles fine. i tryed reconecting it and the motor wanted to die so BAM! theres the problem but i dont know what the censor is so if you know let me know also give this a try to see if it works for you.

[Pu241]

How about a pic?

[Ephet]

This is what is causing my Festiva to run the way it was