1999 Buick Century Diagnostic code cylander 2 miss fire

Tiny
LISHAMATHEWS
  • MEMBER
  • 1999 BUICK CENTURY
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 10,000 MILES
Went to local auto repair store and they got the code cylander 2 missfire and advised me to change spark plugs then wire then coil pack. We (husband & I) have changed spark plugs and wire and went back to get coil pack and another service person is now saying it is the manifold gasket, which could cost up to $700.00 to repair. Help! Need honest and straight awnsers. Hoping you may be able to help me.

Thank you,
Lisha Mathews
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Wednesday, July 23rd, 2008 AT 7:54 AM

7 Replies

Tiny
SERVICE WRITER
  • EXPERT
What did the plug look like that you pulled out?

Intakes are common on these
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Wednesday, July 23rd, 2008 AT 8:10 AM
Tiny
LISHAMATHEWS
  • MEMBER
I was told they looked worn down on the heads. They needed to be replaced. Thanks for the reply
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Wednesday, July 23rd, 2008 AT 8:55 AM
Tiny
SERVICE WRITER
  • EXPERT
It needs to be diagnosed by a shop that normally does this work.

I doubt a coil problem, unless there is corrosion on the coil for that cylinder. I would expect two cyls misfiring other wise. A spark tester can confirm this

The fuel injector should be checked to verify it is working.

HAve you been losing coolant at all?

The cylinder can be compression tested in the event it is the head gasket.

To help check for an intake leak you can:

The cooling system can be placed under pressure overnight and the oil drain plug slowly released to see if any coolant comes out first as it will settle to the bottom.

Or

have the oil drained out overnight with the drain plug out and see if any coolant is caught out
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Wednesday, July 23rd, 2008 AT 9:17 AM
Tiny
LISHAMATHEWS
  • MEMBER
We have been smelling coolent and got a collent flush just 2 weeks ago. Thanks for your help!
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Wednesday, July 23rd, 2008 AT 9:37 AM
Tiny
SERVICE WRITER
  • EXPERT
The coolant flush may have put the gasket over the edge. I wouldn't be surprised if those last two tests yeild coolant to confirm it.
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Wednesday, July 23rd, 2008 AT 12:28 PM
Tiny
MOXXIE
  • MEMBER
If #2 cylinder is misfiring at idle due to a vaccum leak at the manifold. You can determine this easily, by spraying a small amount of carb cleaner around the area of the suspected leak. If the engine idle speed increases, and engine stops misfiring, you have found the leak.
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Wednesday, July 23rd, 2008 AT 2:57 PM
Tiny
SERVICE WRITER
  • EXPERT
Suppose I should have specified intake GASKET leak.

I really can't say I've found these to be a vacuum leak kind of thing on this engine, But great point about checking for intake leaks regardless.
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Wednesday, July 23rd, 2008 AT 4:10 PM

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