Hey, I have an 94 Integra GS-R and I've been having and idle surge problem lately, it revs up to roughly 3100 rpms and then cuts down and climbs back up. Each cycle takes about 5 seconds... I've checked all vacuum lines and nothing seems to be out of place or disconnected... Any help would be greatly appreciated.. Getting tired of weird looks at stop lights like people think I'm doing the revving myself :/

 

Try cleaning your IACV *It might need replaced. Also if it does it when your lights are on or AC you might need to replace your MAF sensor.

Just fixed my 94 gsr it surged when I turned the AC on so I cleaned the IACV and replaced the MAF sensor and it works great now.

 

Ya it just does it all the time.. And I'll look into that thanks

 

The icav is the thing on the backside of the intake manifold right??

 

Yes, with 2 coolant hoses and 1 plug running to it.

 

IACV could be the issue. What ecu are you running? I had this issue after troubleshooting every possible thing and it came down to a chipped ecu I was using. I put the stock ecu back in and the problem went away

 

I'm running a stock p72..I bought it a few months ago and it just started doing this recently.. And I just put 91 octane premium gas in and now it's not surging as rough but still present

 

Cleaned icav thoroughly and still having the issue... Any other suggestions?? Tia

 

1) check forba vacuum leak by spraying brake cleaner or propane around the vacuum lines.
2) check mechanical timing and valve lash.
3) try a new pcv valve

 

I will try those thanks