Problems with 95 Tahoe after installing new motor.

[StevenDey92]

and the brown wire on the abs was for sure 1.6 volts with key on or engine running?

I was probing the wrong one, with key on Brown wire on ABS is 11.73V and running it is 14.5V.

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[SunlitComet]

Then it all seems like the pcm internal electric system is working but it almost like you were scanning the abs module at the time as they use the same codes for its issues. i would try another prom when you can still.

 

[StevenDey92]

Then it all seems like the pcm internal electric system is working but it almost like you were scanning the abs module at the time as they use the same codes for its issues. i would try another prom when you can still.

Have one coming on FedEx, should be here tonight.

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[StevenDey92]

When we put the engine in, we forgot to hook up a ground, we have body to frame hooked up but we didn't hook the braid ground back up from the frame to the block until about a month ago. Could not having that grounded to the block mess up the PROM?

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[StevenDey92]

Put the PROM chip in last night and it didn't make any difference at all...

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[SunlitComet]

would not damage the prom but it would certainly would been possible to goof something but not always and it typically stops when reconnected. any chance when you changed out the block you missed a ground on the back of the heads or ran tests on things like the coil or module to ensue they were reusable? or were they replaced too? if replaced did you use thermal paste on the ic module.mind you that those last two items would not put the vcm in a frenzy so a damaged circuit is more likely. if you need diagrams let e know which ones.

 

[StevenDey92]

Well got it figured out.... all it was was the cap and rotor. Got new ones on and she idles and drives great now... I definitely feel dumb...

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[rockola1971]

neither. your battery or your alternator determines you maximum voltage really. a sudden dump of a capacitor happens when a load is put on it and then it is the current that comes out high. hence if the computer says the voltage is to high it leads back to the alternator because each cell in the battery generally can only generate so much voltage where as the alternator without regulation can just go haywire as long as it is spinning sufficiently.

A capacitor opposes a change in voltage (Not Current) This is why a capacitor is rated by voltage and capacitance, no current rating on a capacitor. A capacitor blocks DC current but allows AC current to pass. A transformer opposes a change in current and is rated for voltage AND current.

 

[rockola1971]

Well got it figured out.... all it was was the cap and rotor. Got new ones on and she idles and drives great now... I definitely feel dumb...

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Ha ha ha ...glad you found it! You should have dumped a Gen 3 or 4 SBC in there and you wouldnt ever have to deal with a Distributor cap and rotor again. I know my 99 Sierra 5.7l runs like absolute crap when it needs a new cap and rotor.

 

[99Vortec]

Are you kidding me? You had a new motor and an old cap and rotor?
What tha? How many miles do you have on the distributor gear?