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Dave Nova
Dave Nova, Buick Technician
Category: Buick
Satisfied Customers: 1808
Experience:  ASE Master Certification. GM World Class Certification
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Misfiring. Have changed all plugs and coil packs and it is

Customer Question

Misfiring. Have changed all plugs and coil packs and it is still misfiring.
JA: How many miles are on the car? Is it a steady misfire? Or random?
Customer: 81,898. Random
JA: What is the model of your '81 Buick?
Customer: 2009 Enclave CXL
JA: Are you fixing your Enclave yourself? What have you tried so far?
Customer: Yes I usually do all my own work. Replaced all plugs and coil packs
JA: Anything else you want the mechanic to know before I connect you?
Customer: That will do it
Submitted: 1 year ago.
Category: Buick
Expert:  Roy Belding replied 1 year ago.

good afternoon my name is ***** ***** I will assist

was there a code associated with the miss fire???

did you check the compression??

do you have a noid light to verify injectors are being commanded on??


Customer: replied 1 year ago.
300, 302, 304 codes. Cleared them last week when I replaced the coils on 2 & 4 and replaced all plugs. During the wrk another code 300 came up. Still misfiring. Today I replaced the rest of the coils. Still misfiring. What about the carbon buildup I've been reading about?
Expert:  Roy Belding replied 1 year ago.

ok, thanks. one of the first things I would do with a 300 code is to verify fuel pressure. very common failure of low fuel pressure to cause the miss fires. if you dont have a tester, you can rent one at a parts store.

I would go here next