1991 Honda Civic runs bad when warmed up to temp

CODEMAN38

MEMBER
1991 HONDA CIVIC
4 CYL
FWD
MANUAL
80,000 MILES

Ok so I swear my car plays tricks on me, when I start my car when its cold it runs fine. But when it gets to temp it stumbles or hesitates through 1000-3000 rpm. The other day ago the car would simply not idle it would just die. And also the car has some hesitation in the idle if it doesnt die completey. And sometimes when I turn my car off and come back in a couple minutes it wont start. Ive changed plug wires, spark plugs, fuel pressure regulator, rotor. I have no clue what it could be, my only thought would be some kind of snesor.

4 Replies

KHLOW2008

MECHANIC
41,814 POSTS

Hi codeman38,

Check the PGM-FI main relay for the non starting issues. It is known to intermittently fail resulting in the fuel pump not working.

As to the stalling, what is the idling speed after warming up?

The stumbliing and hesitation between 1000 and 3000 rpm is most likely a fault with the EGR system.

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Monday, April 5th, 2010 AT 11:14 AM

CODEMAN38

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3 POSTS

Its around 900 1100 rpm

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Monday, April 5th, 2010 AT 10:20 PM

KHLOW2008

MECHANIC
41,814 POSTS

The idling speed is a little higher than specs which is 700 +/- 50.

If the engine is not idling well at 900 to a 1000 rpm, it culd mean the engine is not functioning well. Get a compression test done and let me know the pressure.

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Tuesday, April 6th, 2010 AT 12:31 PM

CODEMAN38