2000 cavalier mid range stumble

[Ratman667]

Originally Posted by theholycow

There is a way to test coil packs. I think you measure their resistance.

Ah, found it:

It's not the coil packs...

Coil for 1&4 measured 5,800 ohms on the secondary and 0.7 ohms primary...

2&3 measured 5,900 ohms secondary and 0.7 ohms primary.

I was hoping that is what is was... Apparently not.

Any ideas?

[GasSavers_BEEF]

clean all the connections maybe?

change out the plugs and wires (though I think you already did recently)

dang-it, the mystery continues

[Ratman667]

I got a CEL earlier. P0420

After doing some research, I think the code is being thrown because of an exhaust leak.

I can rev the engine and when it is going back to idle, I can hear the "pop, pop,pop" of it sucking air. I have a feeling it is at the flex pipe. I'm letting the car cool off before I crawl under it to look.

Correct me if I am wrong, but this would cause the symptoms I am having.

[GasSavers_BEEF]

exhaust may be a good place to start. here is some info from the obd web site.


http://www.obd-codes.com/p0420

[Ratman667]

Originally Posted by BEEF

exhaust may be a good place to start. here is some info from the obd web site.


http://www.obd-codes.com/p0420

I assume you mean the exhaust manifold?

I found the leak. It was at the flex pipe like I thought it was. Next payday, I'm gonna have a new one welded in. Hopfully that fixes it. If not, I will go from there.

Thanks for your help everyone.