I ordered extra ground straps to be installed this week. :-)

 

well, the van battery voltage read under 12 volts this morning. So I purchased a new battery and the van runs much better.


Maybe most of the low voltage ghosts are back in the closet. :-)

More test driving to come.

 

OK, I finally have opened the White Box and have ALDL live telemetry data at runtime now.
The 1ST PASS on data capture confirms there is low voltage on the coolant temperature sensor. And there are 4 malfunction codes present. Yet there was no engine light present at this time.



MALFUNCTION CODES

 

OBD1 ERROR CODE 42 CHECK
https://www.turboimagehost.com/p/233...gnos1.jpg.html

 

4 LOW VOLTAGE ISSUES. It must be a grounding issue? Somewhere? My new ground straps arrived today. Time to wrench them on the van.

 

WOW BIG LESSON LEARNED

DO THE CHEAPEST FIX FIRST!!!!!

Malfunction code are gone.

I cleaned every ground connection to the engine I could find.

I inspected, I tested with a voltmeter, .... and the resolution to the van's low voltage issue was poor ground contacts. All the black box ground tests checked out good. A big false positive in this challenging project.

These older ECM vehicles are very sensitive to poor grounds. I have my van on the ALDL scanner ... going for a test drive.

I shared my pain with you so hopefully, you can avoid it.

Cheers!
Mike

 

POST MODEM:
My van is running great now.
Poor ground to the motor was the problem.
Time vs Money
Define the Symptoms
Identify the potential cause(s) of those symptoms
Get the right tool for the job
Measure the data points of the potential cause(s)
Do the cheapest repairs first.
Clean all ground points even if they test good and look good visually.
Cheers,
Mike

Watch Healthy Chevy 5.7L

 

GHOSTs BUSTED!!! - NO MORE LOW VOLTAGES Van issue was ROOT CAUSE WAS RUST RELATED ON GROUND CABLES TO ENGINE.



as RUST RELATED.