SO i have a wideband 02 and an AFR gauge.
its mounted in a separate bung on the drivers side in my X pipe (has two bungs)

When i punch it my AFR jumps up to 17-18 for a few seconds then drops back down to 13ish. when it drops back down the power comes on like a light switch.

I also have a surging idle (will sometimes stall).

i have wd40'd the IAC, with no change.

I am thinking that the issue now is the MAF. this sound about right?
.

 

When was the last full and complete intake refresh?

 

Sounds like ruptured IAC hoses under the intake. I had similar symptoms driving my 89 and I was greeted with ruptured hoses after replacing the maf and 02 sensor.

Get a can of ether and start spraying around the intake to find the leak. If the idle rises, there is your problem.

You'll need to take the intake off to fix most of them so plan on doing a top end refresh or at least hoses and gaskets at minimum.

 

last full intake was 8-10 years. a few years before I bought it.

also I forgot to add I have a very rich idle.....

 

Ya..its time for a pull apart. You've got multiple issues that all lead to leaks.

 

https://rennlist.com/forums/928-foru...-for-sale.html

Hit up home depot, buy these, identify the leak.

 

I already made one of those for my kids BMW to do a diy smoke test. Looks like I’ll be breaking it out on mine...

Thx

 

So here's a question.

Idle does not fluctuate until car is warmed up.
Won't a vac leak show even when cold.