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98 Regal misfiring in one cylinder, please help

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bp7117
New User

Jan 11, 2011, 11:13 AM

Post #1 of 4 (1936 views)
98 Regal misfiring in one cylinder, please help Sign In
A week ago the check engine light in my 99 Buick Regal came on and the engine was sputtering. Cylinder 2 was misfiring and there was almost no coolant in the car. I added coolant and was driving to the mechanic when the engine stopped sputtering, then the CEL went off. I drove 300 miles since but this morning I have the same problem but the coolant is ok. I just bought it used from a dealer 2 months ago, 114k, not supercharged. The plug wires look new so I assume the plugs are too but I don't know for sure. It's very hard to get at the plug for cylinder 2 in this car. What is the likely problem?


Nathan47
Novice
Nathan47 profile image

Jan 11, 2011, 9:02 PM

Post #2 of 4 (1925 views)
Re: 98 Regal misfiring in one cylinder, please help Sign In
If you can't see any external coolant leaks it might be a blown head gasket. You will need to take it to a shop and have them do a cylinder leakdown test to see if this is the case. Have you noticed if the oil is milky? This is another sign.


Sidom
Veteran / Moderator
Sidom profile image

Jan 11, 2011, 9:15 PM

Post #3 of 4 (1924 views)
Re: 98 Regal misfiring in one cylinder, please help Sign In
In Reply To
The plug wires look new so I assume the plugs are too but I don't know for sure. It's very hard to get at the plug for cylinder 2 in this car.

You can't go by if the parts "look good". That type of diagnosing will waste a ton of time & $$$$$$$$$$$.

If you don't have the proper equipment (scope & scanner) to check it out, then you will have to go old school and pull the plugs so you can swap those & the wires to other cyls to see if the miss moves & also check compression on that cyl..

Until you are able to get that done it's all just blind guessing...


bp7117
New User

Jan 12, 2011, 9:34 AM

Post #4 of 4 (1920 views)
Re: 98 Regal misfiring in one cylinder, please help Sign In
I went to a mechanic and he said one injector was clogged and one was partially. He tried to charge me $900 to replace both and put in new plugs. I added Sea Foam and now everythings fine, the cel went off and the engine sounds good. Is it a hard job to replace or just take out and check the injectors myself? Or should I just let things be as they are and see if the CEL comes on again? Thanks.





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