1992 Other Chevrolet Models 92 S-10 Blazer

In the early 90's, the most common problem with the 4.3L V6 was the intake gasket. Have you checked for vacuum leaks around it? Check closely around the rear of the intake. Also, has the check engine light been on? Have you checked fuel pump pressure? And finally, if everything else checks out fine, you'll need to check the catylatic converter to see if it is plugged at all. Have you ever heard a rattle from the exhaust? If so, the inside of the converter could be loose and causing a random problem.

Let me know what you find.

Joe

Thanks for the quick response. This may sound silly but can you tell me or point me in the right direction for the intake gasket. I will check there first. The check engine light did come on once but after I tested the air intake control valve and it was replaced with no further light indicators. I have not checked fuel pressure but that can be done (by me hopefully). How can I check the catalytic converter? Is it a visual check or a test that can be run? Finally I will listen for any rattle from the exhaust. Just to add on the stalling seems to be cyclical, it's never random it always sputters after the same amount of time.

We are here to help, so don't feel funny asking any questions. The intake manifold is located on the top of the engine. It bolts to the engine block. Also, the throttle body is bolted to the top of it. If you look straight down at the top of the engine, you will see a large aluminum part that bolts at each side of the engine. That is the intake. If you are still unsure, let me know and I will try to dig up some pictures.

As far as the converter, with the engine running, listen for ratteling, hissing... sounds coming from that area. Also, check the exhause to make sure there is a good amount of pressure coming from it.

As far as a visual inspection, when a converter is plugged, it will get so hot when the engine is running that it will turn red hot. If you look at it (after driving) with the engine still running and it is glowing red hot, chances are it is plugged.

Let me know what you find and if you have other questions. Remember, the only dumb question is one that is not asked, so please feel free to ask anything.

Take care,
Joe

Sorry I have not been able to get back to you promptly. I have recently replaced the fuel pump and battery because both gave out and am replacing the oil ignition switch due to a leak. I thought after replacing the fuel pump the blazer would perform better but it has not. As to your previous suggestions here is what I have done. I checked the catalytic converter and it was hot to the touch. Today I will check for rattling or hissing. About the exhaust pressure, how can I measure the pressure myself? Will the pressure or lack thereof be obvious? Lastly I will look for some air pressure leaks from the intake manifold. Thanks for your help.

To properly test catalytic converter pressure, you need a pressure gauge and to remove the up and down stream O2 sensors. Just see if you hear any ratteling or if the converter appears red hot after driving or if you hear a whisteling or there is little pressure coming from the exhaust.