One minute fine next minute knock?

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Wade
Posts: 562
Joined: Mon Jul 11, 2016 6:29 am
cars: Vr 5.0 statesman vr exec 5.0 turbo vy clubsport

One minute fine next minute knock?

Post by Wade »

Any ideas? Stock tune running fine. Next day same tune and getting knock everywhere
immortality
Posts: 3416
Joined: Thu Apr 09, 2009 12:31 pm
cars: VH, VN, VS, VX

Re: One minute fine next minute knock?

Post by immortality »

FPR, fuel pump, stuck injector?

What mods, anything worked on before the knocking issue occurred?
Wade
Posts: 562
Joined: Mon Jul 11, 2016 6:29 am
cars: Vr 5.0 statesman vr exec 5.0 turbo vy clubsport

Re: One minute fine next minute knock?

Post by Wade »

Everything stock l67 from my understanding. May have a very mild cam and unknown comp je forgies
Wade
Posts: 562
Joined: Mon Jul 11, 2016 6:29 am
cars: Vr 5.0 statesman vr exec 5.0 turbo vy clubsport

Re: One minute fine next minute knock?

Post by Wade »

Owner has told me he hasnt made any changes since yesterday. Was running fine yesterday but today its got knock everywhere. He says the exhaust is rattling. Could it be failing ignition or the exhaust rattle? Fuel looks rich in the logs
immortality
Posts: 3416
Joined: Thu Apr 09, 2009 12:31 pm
cars: VH, VN, VS, VX

Re: One minute fine next minute knock?

Post by immortality »

LOL, what changes did he make before yesterday?

I wonder if this is the same guy who's been asking questions on the JC forum? I think he had a sick L67 and was going to put new rods/pistons in it from MACE or something along those lines? There is probably a bit more to this story me thinks.

Stuck open injector, one pot will be extremely rich, PCM will pull fuel from that bank and make the other cylinders run lean. Check the fuel trims.
Wade
Posts: 562
Joined: Mon Jul 11, 2016 6:29 am
cars: Vr 5.0 statesman vr exec 5.0 turbo vy clubsport

Re: One minute fine next minute knock?

Post by Wade »

Yeah very much could be. Ill post the logs he sent me later
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