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need a hand on a 2004 8.1L spark knock

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Old 11-08-2018, 07:44 PM
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Good to know. That makes sense.
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Old 11-09-2018, 06:36 PM
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so i fixed some small things today

test ran the motor again with and with out the temp sensor to make it go in and out of open/close loop . it still runs the same
i could not find the old temp sensor to plug it in to see if it ran any better . its around here some where so i well test that next time i find it
my guess of it running better in open loop was not so today . it still ran bad at start up and open and closed loop

no luck on PCM guys no calls or emails back
the program is 300$ and would let me see every thing like a code reader . and let me right my own PCMs but thats a new skill i would have to pick up.

the only old parts i am still running on is
Wiring
PCM
throttle body.... and i have looked at it 10 ways from Sunday as it has some play in the gear box side of it and a vacuum noise when it opens like its having a hard time getting air but i have had it off 3 times
looked at it and cleaned it really well to see if unread air was getting in and it looks good . its a older 2002 throttle body with the older vacuum lines on the sides but in 2004 they where removed but all wiring and plugs are the same
no vacuum leaks around the throttle body

just going over every last thing left

i am not sure where you live but REALLY.. do you know any 1 around you that could help me take a look at it and maybe fight with the PCM if it comes down to that
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Old 11-10-2018, 11:50 PM
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Originally Posted by terry735001 View Post
i am not sure where you live but REALLY.. do you know any 1 around you that could help me take a look at it and maybe fight with the PCM if it comes down to that
I'm near the rocky mountains. I know a couple of dealers that would default it and program in specific changes like the gear ratio. I don't know that they'd fight with it a lot, but they'd do a fair job of diagnosing the real issue.


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