I have a 93 hatch with a b18 with a gsr trans running a chipped 72 with stock ls map, now my problem is when I push the the car hard and come to a stop the idle drops to about 400 and bounces until I turn the car off and start it back up. When I drive the car normal it doesn't do it and idles at 750. Any ideals on what it could be?

 

Clean IACV
Check for vacuum leaks
Open up the FITV under the TB and screw it all the way in.

 

Tried that but still have the problem, I was told it might be the dizzy starting to go any ideal on that?

 

check your coolant levels as well if the coolant is low the iac valve wont get enough and it will have that eratic idle issue

 

Coolant is fine, by the way it only does it when I drive in the city not the highway

 

It's like if I rev all the gear up to 5k rpm when I come to a stop it starts surging at 500 to 400 rpms. Any help?

 

could need a tune up, missfire maybe? obd1 is pretty lame at detecting misefire so its a possibility

 

i have similar probelm check my posts

 

I put a new dizzy, rotor caps wire and plugs when I got it

 

Im sure its your dizzy. You sure the one you bought was a brand new one or not a messed up used one? I have the same exact problem right now. Any cel?

 

No cel if it was my dizzy why doesn't it do it when I drive on the high way the car is at high rpms and engine is hot, I can push it to 100 mph with no problem.

 

I'm starting to think its the chip in the ecu

 

By th way I have a lot of back from the exhaust when I'm in slowing down from 4k to about 2k in all gears

 

Do you have another ECU you can test?

 

I bought a p28 chip but it doesn't work. So no

 

The dizzy wont mess up the speed. Mine has a cel with 9 blinks thats for the dizzy. Maybe yours is a different problem but I have the same idleing problem as you. One way you can tell if its the dizzy is if your hitting it about to reach your rev limit and rpms bounce just before reaching it. My idles start to bounce as well when running and I turn on the ac after driving for a while.

 

I'll try that tomorrow

 

Backfireing is another thing to with mine haha. Its the spark from the dizzy its an internal problem borrow someones and test it out. Doesnt hurt to try.

 

Don't know any one with a b18

 

Ok I tried what you said but it rev fine all the way up to the rev limiter, but once I let the throttle go it drop to 400 and starting bogging up and down. Also notticed driving in traffic today the idle going up and down between 1000 and 1300. I think my fiac is getting stuck so ima try to clean it out tomorrow.