Question about 2002 Pontiac Sunfire

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My sunfire won't stay running for more than 10 minutes

I've changed the spark plugs & wire boots,battery,air filter,catalyst converter and new muffler. could it be the computer????

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How does it run when running for 10 min. yes it can be computer or groung or timing chain base timing coulkd be out

Posted on Jan 18, 2009

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PO420 CODE ON CHEVY S10


Hi

The code means---

Catalyst Efficiency
Below Threshold
(Bank 1)

Please make sure there is no air entering the engine behind the maf, such as a vacuum leak or leaks in ducting between the maf and the throttle body.

If that's no the case then its an issue with injectors clogging and they are not working due to "fretting". This "fretting" is electrical terminals to injectors getting oxidation on them and is fixed by unplugging them and replugging them in. The fix is to put a small dab of die-electric grease on the terminals.

I would suggest an injector service with the new GM procedure using "Top Engine Cleaner". This may be all you need but that P0420 bothers me. P0420, Catalyst System Efficiency Below Threshold, can be set by a poor connection at the PCM or a damaged wiring harness.

Please rate this soluton as FixYa if found useful.

Thanks
Rylee

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