Join Date: Apr 2005
Location: Gastonia, just west of Charlotte, NC
5timedime is offline
Re: 4.3 running badly (S10 Blazer 91 4x4)
mine would run fine for a few minutes and then act like it was running out of fuel, so i started by changing the fuel filter. that didn't fix it, so i got my wife to spin it over and i saw the injectors working fine ('89 4.3 tbi). so i put a timing light on it to check the spark and it was good. next, i removed the oxygen sensor and drove it up the road and back. it sounded like shit, but it didn't cut off any more! thus, i knew the catalytic converter was clogged (caused by my engine burning a lot of oil). so i would definitely get the catalytic converter checked out.
'89 x-cab 4.3 auto. dime number 6