Question about GMC Suburban

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1990 suburban dies when warm

Also blew chunks of cat out of the exhaust pipe. It runs fine first few min., then sputters, misses, and dies like it's starving. Have replaced wire set, cleaned EGR, cleaned carb intake, new air filter. Not sure which direction to point. No check engine light, no SES. Check engine light works because it shows when starting. Any guidance?

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1 Answer

You obviously have to replace a worn out
& melted or broken cat, before you can diagnose
anything

If the cat is bad you got no fuel control,so the cat goes,
as well as the oxygen sensor

Odds are the timing chain gears are worn & it jumped time

You may have vacuum leaks

1990 doesn't have a carb it has a throttle body !

So you check test the tps sensor & it's adjustment,if any

You test the cts,ats,& map sensors

Air --In---Air--Out---not with a blocked cat,thus most
of your problem,maybe a clogged gas filter as well

Posted on May 12, 2014

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