1996 silverado running wierd can i get some help

Asked by Jul 14, 2015 at 06:58 PM about the 1996 Chevrolet C/K 1500 Silverado Standard Cab SB

Question type: Maintenance & Repair

my 1996 chevy 1500 4x4 has a problem i need help. while riding down the road after
about 5 miles the RPM gauge will drop to zero and the MPH will go to 100. the
transmission will shift down to 3rd gear and runs like until you shut the truck off..Has
anyone else had this problem and if so how to correct it    Thanks

3 Answers

86,565

It sounds like a electrical ground problem and there are quite a few on this rig and you should also check the ECM reference voltage, as it seems to be just about right for the system to go into closed loop when it starts acting up. Have you checked for any codes?

no have not checked codes . i just got the truck and the guy i got it from said the PCM was bad.. when i got it home i noticed the positive terminal on the battery was not tight so i replaced the battery and terminals and it did not show service engine light . on my way home it acted up again . I do not know how to check the reference voltage

86,565

Then I would suggest getting a good code reader, not one of these cheap one at Autozone, maybe one that can do "live data" scanning would be your best bet. I think you are going to need it. Innova makes a decent one.

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