Question about 2000 Chevrolet Astro
Run up to 2500 RPM or so
Runs good for a while ( 15 or 20 seconds)
Starts to misfire
Continues to misfire at speed or idle
Pumps raw gas out tailpipe
Let it sit a while (hours) and restart...same behavior
Have replaced all ignition components
Only DTC code is for random misfire
This sounds like a classic GM plugged catalytic converter symptom. If you like you could remove the oxygen sensor in front of the cat and try driving it. With the sensor removed, the exhaust can escape a little more easily and will drive better if the cat is the problem. If you have the right fitting and a gauge, you could actually measure the back pressure at the oxygen sensor hole. It should not be any higher than about 2 psi at 3000 rpm. I have seen this problem several times now on these vans and I'm almost certain this is your problem.
Hope this helps,
Posted on Apr 25, 2010
Testimonial: "Looks like it might be the ticket, I'll check the back pressure as suggested to see if it's the problem. Thanks!"
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Posted on Jan 02, 2017
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