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I have a 1989 Pontiac Grand Prix SE with 2.8 L engine ...


Sent to Car Experts October 12, 2006 4:38 p.m.
I have a 1989 Pontiac Grand Prix SE with 2.8 L engine and 5 speed manual transmission. I am experiencing engine misfire when accelerating but when the engine reaches speed, the engine runs as smooth as silk. Any suggestions as to what causes this?

Optional Information:
1989 Pontiac GrandPrix SE 2.8 L V-6

Already Tried:
Changed spark plugs - spark plug wires - added fuel injectore cleaner to gas tank
Customer (name blocked for privacy)
Status: Closed   Value: $9.95   
Answer
October 12, 2006 4:53 p.m. (14 minutes and 12 seconds later) 		REPLIED Check Mark

Greetings! What about the coils? Have u changed them?

Are there any codes in the computer? Is the check engine light on?



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PictureAMEDEE  -- ASE MASTER TECH -- 98% Positive Feedback on 1021 Car Accepts
ADVANCED LEVEL SPECIALIST
Reply to amedee
Sent October 12, 2006 5:14 p.m. (21 minutes and 35 seconds later)
Have not changed any coils - no engine codes in the computer - no check engine light on -- Original problem began almost a year ago on a trip down from Chicago to Miami -- After 900 miles of uneventful travel, the engine started to stall out when gas pedal was depressed to accellerate - when the gas was released and the clutch engaged, the engine ran OK at idle but stalled when gas pedal was pressed. After 3 days in Chattahoochee, Florida repair shop where one faulty fuel injector was replaced - Before that, we tried replacing the fuel filter, tested the fuel pump for pressure, checked all the spark plugs and wires.

Edited by Customer (name blocked for privacy) on October 12 2006 at 5:19pm
Customer (name blocked for privacy)
Answer
October 12, 2006 5:36 p.m. (21 minutes and 18 seconds later) 		REPLIED Check Mark

DO we know what the fuel pressure was at then?

I would rec to to check fuel pressure again. Just to be sure we are not chasing our tail



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PictureAMEDEE  -- ASE MASTER TECH -- 98% Positive Feedback on 1021 Car Accepts
ADVANCED LEVEL SPECIALIST
Reply to amedee
Sent October 13, 2006 11:22 a.m. (17 hours and 46 minutes later)
Fuel pressure was fine according to the mechanic in Chattahoochee
Customer (name blocked for privacy)
Answer
October 13, 2006 11:39 a.m. (17 minutes and 1 second later) 		REPLIED Check Mark

Sounds like the coils are bad.

Keep in mind that fuel injectors can be bad two ways. Mechanically and electronically. If they are mechanically plugged only sometimes fuel injector clear through the gas tank will work enough to clean them out completely. If they are electronically bad and the electrical specs are out, fuel injector cleaner will not work at all!



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PictureAMEDEE  -- ASE MASTER TECH -- 98% Positive Feedback on 1021 Car Accepts
ADVANCED LEVEL SPECIALIST
Reply to amedee
Sent October 13, 2006 11:47 a.m. (8 minutes and 11 seconds later)
Where are the coils located? Is there a way to test the fuel injectors for electronic problems??

Edited by Customer (name blocked for privacy) on October 13 2006 at 12:32pm
Customer (name blocked for privacy)
Answer
October 13, 2006 12:54 p.m. (1 hour and 7 minutes later) 		REPLIED Check Mark
Follow the spark plug wires from the plugs and they will go to the coils. U can ohm out each injector after removing the intake manifold (if in the way). 11.8 to 12.8 ohms. NO more or no less!

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PictureAMEDEE  -- ASE MASTER TECH -- 98% Positive Feedback on 1021 Car Accepts
ADVANCED LEVEL SPECIALIST
Reply to amedee
Sent October 13, 2006 1:10 p.m. (15 minutes and 58 seconds later)
Thanks - I'll see what I can do over the weekend and get back with you later
Customer (name blocked for privacy)

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