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Bad ECM or wrong vp44??

Posted

I recently put a HO pump on my SO motor and it idles at about 1100 rpm once it warms up. If you floor it it’ll idle normal. But the ECM has a few high voltage codes for sensors so I’m wondering if the 5v supply is going whack or if I need to get an SO pump to put on. 

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My understanding is the HO has problems on an SO motor. But others here no more than I on that issue. What troubles codes are you seeing?

Edited by dripley

  • Author

It’s all the high voltage codes for random sensors. One of which being the TPS

I would first make sure everything with your 5-volt supply good before I touch VP. Could be anything from a loose wire to a bad sensor, and could be any of them that share 5 volt Loop.

ECM is in control of idle, if you rev it up and it becomes normal, almost points to alternator putting out excessive AC current.

  • Author

Well all 6 wires going to the tps have 5v, the 2 grounds even have power. This VP is a HO I think too and I have an SO motor 

  • Author

I pulled the alternator and it’s covered in oil from a front main leak but it was backfeeding some wires that I tested so maybe a new alternator could be the fix 

I'm not an electric chicken, but alternator only has one wire going to pdc so not sure how it can back feed anything. 

But it does sound like you may have some electrical issues. 

3 hours ago, Dieselfuture said:

I'm not an electric chicken,

 

But if you were and you leaned up against an electric fence, you might understand how back feeding could occur.

 

- John

Edited by Tractorman
forgot the word "fence"

28 minutes ago, Tractorman said:

 

But if you were and you leaned up against an electric, you might understand how back feeding could occur.

 

- John

I'm kinda beginning to understand but not sure how it works a 100% 

If there is one charge wire going from alternator to pdc or battery, how can anything backfeed of it if nothing else is touching it. 

Can someone school me on this

2 minutes ago, dripley said:

Not the chicken. No no no!!!

I was trying to be funny, sorry. Look where it's gotten me :kick:

    • Sad 1
    1 hour ago, Dieselfuture said:

    I was trying to be funny, sorry. Look where it's gotten me :kick:

    I saw the humor. We are good on that.

    • Like 1
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