1995 Honda Civic idle surge

MURO78

MEMBER
1995 HONDA CIVIC
4 CYL
2WD
AUTOMATIC
173,000 MILES

I have a 1995 Honda Civic with 173,000 miles. My issue is at start up the idle shoots up to about 2800 rpms, then idles down and surges from 1000 to 1500 rpm's. I have replaced the I/AC motor which I thought had something to do with the idle since when I would unplug the connector the engine would idle down, and not surge. This did not help much, and was very costly.

2 Replies

MHPAUTOS

MECHANIC
31,937 POSTS

Hi there,

run a diagnostic code check to see if there are any set fault codes, if so inspect these first, also check for any vacuum leaks, at hoses and manifold gaskets. Start there.

Mark (mhpautos)

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Sunday, February 10th, 2008 AT 12:10 AM

MURO78

MEMBER
4 POSTS

I fixed it! I not sure what the part is called. Maybe I can get some clarification from the Car Pro Mechanics. What I've done was replaced the Idle control motor, but this did not work. So I decided to remove the throttle body, and clean it. **Just a note if you decide to remove the throttle body make sure you purchase a new throttle body gasket. When removing the throttle body the gasket does not come off in one piece.** I removed the part on the bottom of the throttle body(this is the part I not sure what it is called) that radiator fluid runs through. I took it apart, and found that the valve mechanism inside had unscrewed, and was flopping around inside. I cleaned the port, reinstalled the valve. Put everything back together, and it worked! The car no longer races at start up and no longer surges at Idle.

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Monday, February 25th, 2008 AT 9:22 AM