1991 Honda Civic Idle Surge After Intake

HONDA CIVIC
Avatar
HONDACHIN
  • MEMBER
  • 1 POST
Hi guys this is my first time being on this site and it look like it would help me in the furture with my stuff but yeah i have a qustion. I just but a new intake system in my honda civic 1991 hatchback si. And it running graet but i problem. when im at a stop sign or light and i sit there (my car is Manually) and my rpm needle would go down then back up and back down and back up. i can feel my engine doing that. what is that and what can i do to fix it?
Mar 10, 2006 at 1:19 AM
Advertisement
Avatar
BRUCE HUNT
  • ✓Experienced Mechanic
  • 3,754 POSTS
If you just put a new intake in or messed with the intake, did you put a new gasket on. If so did you get the entire old gasket off? The surging that the engine is doing is the computer trying to compensate fuel to the extra flow of air leaking at the intake gasket. I would bet that is your problem.
Mar 13, 2006 at 10:16 AM

Suggested Repair

Inspect the intake gasket after the new intake install. Confirm a new gasket was used and that all old gasket material was removed, since an air leak there can make the computer surge fuel and cause the idle RPM to rise and fall.

Conversation Summary

The owner of a 1991 Honda Civic hatchback Si installed a new intake and now feels the engine surge at stops, with the RPM needle going down and back up. The expert says the computer is likely compensating for extra air from a leaking intake gasket and recommends checking that a new gasket was installed and the old gasket was fully removed.

Add a reply
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.

Ask a new question

Frequently Asked Problems for This Vehicle