Check Engine Light- Diag-MisFire Cylinder#3/Oil Pressure ? - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 03-02-2006, 11:50 PM   #1
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Default Check Engine Light- Diag-MisFire Cylinder#3/Oil Pressure ?

Just had car serviced- Check engine light came on -on open highway- doing around 50/55- car was lightly surging etc- made it home no problem. but I did notice after the light came on that the oil pressure reading at a full stop at a red-light in Drive- was very low-went from normally a little below 40 PSI down to just above the red-line area on the pressure gage.
I had the car scanned- came back mis-fire in cylinder # 3- had brand new set of Ignition wires put on- also oil/oilfilter service (was about due (3000 miles intervals).

Car is running great- NO Check Engine light- idling from 40 to a little higher in N and a little below 40 to right at 40 in D at a complete stop.

I'm not a mechanic - just curious- can just one cylinder mis-firing have that much effect on your oil pressure to almost drop it to Red-line? ( Oil level was at full when the Check Engine Light Came On so That was not the cause of the low pressure).
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Old 03-03-2006, 09:37 AM   #2
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No, misfires won't effect oil pressure unless the rpm are so low you are not building pressure.

Your oil pressure was most likely fixed with a well needed oil change.

How many miles were on that oil and was it regular oil or synthetic?
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Old 03-03-2006, 09:41 AM   #3
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Quote:
Originally Posted by BillBoost37
Your oil pressure was most likely fixed with a well needed oil change.

How many miles were on that oil and was it regular oil or synthetic?
He said about 3000... :P
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Old 03-03-2006, 09:47 AM   #4
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Synthetic shouldn't be breaking down and give pressure issues at that mileage, regular oil will.
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Old 03-03-2006, 10:37 AM   #5
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Quote:
Originally Posted by BillBoost37
No, misfires won't effect oil pressure unless the rpm are so low you are not building pressure.

Your oil pressure was most likely fixed with a well needed oil change.

How many miles were on that oil and was it regular oil or synthetic?



RPM'* were normal - around 1000 at an idle- never dropped any lower.

2,958 miles to be exact and it was regular oil- 10W30. I have never used synthetic in any of my vehicles. Is it possible the oil filter or oil pump was clogged etc.?

Thanks for the reply- I did not think that could of caused it.-

Its fixed and running great .
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Old 03-03-2006, 10:39 AM   #6
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I doubt either were clogged.

Have noticed myself if I get oil changes done for me or use lower cost oils that they bread down quicker and by 3,000 miles pressure is dropping off like you mentioned.
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Old 03-03-2006, 10:47 AM   #7
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I doubt either were clogged.

Have noticed myself if I get oil changes done for me or use lower cost oils that they bread down quicker and by 3,000 miles pressure is dropping off like you mentioned.

Your probably right- I usually change my own oil and filter and usually use either Quaker State or Penns Oil- I know Service stations and the like use a "BULK" grade oil whatever that is - maybe it is not as good- Just that I do not feel like doing this job in the winter- TOO OLD to be laying on a cold icy driveway- no thanks!
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Old 03-03-2006, 10:49 AM   #8
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I agree and I'm sure the oil meets the needed specs. I've noticed it breaks down quicker, which brings you back for another change quicker.
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