1991 Chevrolet Silverado engine service code meaning

CBREUNIG20

MEMBER
1991 CHEVROLET SILVERADO
142,000 MILES

Just bought a truck and the timing was severely off, got that fixed but still the truck would leave me sitting pushing it to the nearest gas station. I changed the fuel filter I changed the manifolds plugs n wires, I changed I changed the throttle positioning sensor. And still it leaves me sitting not as much but sometimes. I was thinking it could be the o2 sensor but il leave it to the pros before I put anymore money into it. I used a testing device and its a code 83 problem that it reads. What is code 83 for the chevy silerado 5.7 full cab k2500. Please tell me you have an answer

1 Reply

WRENCHTECH

MECHANIC
20,761 POSTS

An 0/2 sensor won't cause a "no start".

All "crank, no start" conditions are approached in the same way. Every engine requires certain functions to be able to run. Some of these functions rely on specific components to work and some components are part of more than one function so it is important to see the whole picture to be able to conclude anything about what may have failed. Also, these functions can ONLY be tested during the failure. Any other time and they will simply test good because the problem isn't present at the moment.
If you approach this in any other way, you are merely guessing and that only serves to replace unnecessary parts and wastes money.

Every engine requires spark, fuel and compression to run. That's what we have to look for.

These are the basics that need to be tested and will give us the info required to isolate a cause.

1) Test for spark at the plug end of the wire using a spark tester. If none found, check for power supply on the + terminal of the coil with the key on.

2) Test for injector pulse using a small bulb called a noid light. If none found, check for power supply at one side of the injector with the key on.

3) Use a fuel pressure gauge to test for correct fuel pressure, also noticing if the pressure holds when key is shut off.

Once you have determined which of these functions has dropped out,
you will know which system is having the problem.