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cylinder 7 miss fire

how do I identify cylinder 7?

Re: cylinder 7 miss fire

Postby adam86107 » May 23 2020, 1:05am

Do you still have AFM active? If so, I'd disable it soon, might save yourself a headache.
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Re: cylinder 7 miss fire

Postby kjfalk1 [OP] » May 23 2020, 1:11am

I'm sorry but I don't know what that means. If you mean is it throwing a code then no
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Re: cylinder 7 miss fire

Postby shakenfake » May 23 2020, 1:15am

kjfalk1 wrote:I'm sorry but I don't know what that means. If you mean is it throwing a code then no

AFM is Active Fuel Management which turns your V8 into only using four cylinders until it decides you need the power of the V8 again. You can disable it with a chip. AFM is known to fail often and is expensive to fix
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Re: cylinder 7 miss fire

Postby ferraiolo1 » May 23 2020, 1:23am

You’re about to have a hard and lifter failure.


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Re: cylinder 7 miss fire

Postby kjfalk1 [OP] » May 23 2020, 1:33am

Oh thats just great. How much money are we talking about?
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Re: cylinder 7 miss fire

Postby kjfalk1 [OP] » May 23 2020, 1:36am

I just saw a video on YouTube that says you can disable it by going into manuel mode till 5th gear in city driving.
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Re: cylinder 7 miss fire

Postby 19trax95 » May 23 2020, 1:37am

Around $600-700 or less depending where you get the parts for a delete kit with everything you need except tuning.

And if the lifter is failing you are WAY past the point of disabling it to help anything.
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Re: cylinder 7 miss fire

Postby kjfalk1 [OP] » May 23 2020, 1:45am

It has the famous GM tap first thing in the morning when I start it for about 3 to 5 seconds and then it goes away. But I've been driving Gm cars all my life and they all had it, old and new. Is that the noise you're talking about?
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Re: cylinder 7 miss fire

Postby 19trax95 » May 23 2020, 1:56am

The tap is fairly "normal" for the hydraulic lifter motors.

But a misfire, especially on one of the AFM cylinders, is a dead giveaway that there was, or so about to be a lifter failure.

They will stick and ruin the cam often times. It's best to catch it before it fails completely if your lucky. It can end up costing you a motor in a hurry.

Happend to my father 09 under warranty with 20k on it. Had a couple issues and then one day it totally let loose. Lifter collapsed, wiped out the cam lobe, which sent metal into the oil. The metal packed the filter to the point it bypassed oil and proceeded to spin main bearings.

He got a new long block under warranty. Was a huge ordeal. The dealer had techs from GM come out and assist with the repair.
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Re: cylinder 7 miss fire

Postby kjfalk1 [OP] » May 23 2020, 2:18am

so you think I should just replace the lifter on number 7?
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