1991 Honda Civic runs bad when warmed up to temp

Tiny
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.
Tuesday, March 30th, 2010 AT 11:49 PM

4 Replies

Tiny
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
Tiny
CODEMAN38
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  • 3 POSTS
Its around 900 1100 rpm
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Monday, April 5th, 2010 AT 10:20 PM
Tiny
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
Tiny
CODEMAN38
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Ok thank you, ill get back to you
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Wednesday, April 7th, 2010 AT 1:34 PM

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