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Jay, Certified Infiniti Technician
Category: Infiniti
Satisfied Customers: 3810
Experience:  20+years, Nissan and Infiniti experience and currently now working for a Infiniti Dealer
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We have 150 compression on 4 and 6, new plugs, new coils and

Customer Question

We have 150 compression on 4 and 6, new plugs, new coils and 2 new injectors but still have misfires on 4 and 6. Pulling our hair out.
JA: How many miles are on the car? Is it a steady misfire? Or random?
Customer: 182,447 miles and it's a steady misfire
JA: What is the make/model/year of your car?
Customer: 03 Infiniti G35 3.5L engine
JA: Are you fixing your G35 yourself? What have you tried so far?
Customer: Yes. Coils, plugs and injectors have been replaced and engine has 150lbs compression
JA: Anything else you want the mechanic to know before I connect you?
Customer: No
Submitted: 8 months ago.
Category: Infiniti
Expert:  Jay replied 8 months ago.

Hello my name is ***** ***** thank you for your question.

Are you disabling the fuel system when you are doing the compression check? Also what brand spark plugs do you have?

Expert:  Jay replied 8 months ago.

Failure to disable the fuel system could wash out the cylinder walls and lower compression when doing a compression check. Compression should be around 185 high, and 142 low. So 150 would still be good, but would like to see it a little higher. That is why I am asking about the fuel system. Also let me know what brand spark plugs you have installed. These cars are very sensitive to the brand spark plugs used.

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