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Did scan. Says number one cylinder misfiring. Put in new…

Customer Question
Did scan. Says number...

Did scan. Says number one cylinder misfiring. Put in new plug but used existing wire. Seems to run smother but engine light flashed. Over. 30 mph. 2004 Pontiac Grand Prix 3800. Non turbo

Mechanic's Assistant: Thanks. Can you give me any more details about your issue?

Yes when I accelerate can detect some vibration. Temp gauge got just into the hot range while I was having a conversation. I shut it off. Removed radiator cap. There was a slight pause then antifreeze spewed out all over engine compartment. I put in new antifreeze. Not overheating but ran rough after that. Drive about 1500 miles this week and so just now replaced plug on number one cylinder. Existing plug looked dry black. Gap was like three times the gap on new plug. Runs better but sight vibration upon exhilaration

Submitted: 2 years ago.Category: Pontiac
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Answered in 6 minutes by:
3/6/2016
Pontiac Mechanic: GM Bob, ASE Certified Technician replied 2 years ago
GM Bob
GM Bob, ASE Certified Technician
Category: Pontiac
Satisfied Customers: 1,240
Experience: 30 plus years. experience as GM technician, ASE Master Technician and GM Certified.
Verified

Hello my name is ***** ***** I can help.

Have you tried swapping the spark plug wire? To see if the misfire moves to the other cylinder.

I'm think you got the cylinder to hot and now the one of the valves are bad.

If the misfire does not move with the wire. Need to do a compression test and a leak down test

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Customer reply replied 2 years ago
Haven't tried switching the wire. What would be the problem you suspect ?
Pontiac Mechanic: GM Bob, ASE Certified Technician replied 2 years ago

If the wire does not help. Do this first

I think the exhaust or intake valve are not seating. Need to do a compression test and a leak down test.

May have to remove the head and have it recondition.

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Pontiac Mechanic: GM Bob, ASE Certified Technician replied 2 years ago

Did you need more help?

Let me know if I was helpful.

Thank you

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