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Buick Regal Custom 3.8 CAR MISSES IN 4TH GEAR.

Tiny
WENDELL A
  • MEMBER
  • 1993 BUICK REGAL
  • 62,000 MILES
Has lots of power and does not miss when accelerating and when it shifts into high gear it misses.
Sunday, March 25th, 2012 AT 11:07 PM

4 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Do you have a check engine light?

Could be coming from the transmisson-Check the transmission fluid level and condition.Also refer to this walk-thru link of misfires: https://www.2carpros.com/articles/engine-misfires-or-runs-rough
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Sunday, March 25th, 2012 AT 11:15 PM
Tiny
WENDELL A
  • MEMBER
  • 3 POSTS
No check engine light. When I put my OBD1 THE FANS RADIATOR FANS START AND DO NOT STOP UNTIL I PULL THE OBD1 FROM THE SOCKET. I have checked all the sensors except the IAC which I will do Tuewsday. All the sensors check okay.
I do have a miss at idle but it is hard to see the engine move as I have replaced all the motor mounts. I have checked all the injectors and all are working and they all have 11.6 ohms.
They all work when I put the stethoscope on each one.
I have checked the ICM and it checks okay. Each spark plug I have checked and all are the same color. I have put new plug and plug wiring on this past week with no improvement.
I have an idea when I take the throttle body off and check the ICA I probably will be my problem. It amazes me that it has so much power when you put it to the floor.
Any help would really be appreciated. Wendell A
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Sunday, March 25th, 2012 AT 11:38 PM
Tiny
WENDELL A
  • MEMBER
  • 3 POSTS
Also when the engine is idling and I turn on the ac the engine does not increase in rpm. Wendell A
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Sunday, March 25th, 2012 AT 11:57 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Triple check the IACV- when the AC is turn On- the idle speed should stabilize not drop due to the extra electrical load imposed-
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Monday, March 26th, 2012 AT 2:53 AM

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