Engine misfire
January 29th, 2013, 6:04 PM
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Engine misfire
I have a 2001 Chevy Silverado 4.3 V-6. No check engine light and misfires like out of time or bad gas. Pops out the exhaust. Shows codes P0300, P0430 and code for map air flow sensor. i have checked all the above and i cleaned my throttle body completely and still have the same results . checked all plugs and wires, did complete compression check and did a fuel pressure check . runs ok at an idle and while in park or neutal, as soon as i put it into drive and the engine is under load it runs really rough. i am stumpped and dont have any ideas . thought maybe bad gas or water in fuel somehow but added plenty more fuel and heat treatment. plz someone help me .
February 3rd, 2013, 2:10 PM
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OBD2 - OBDII Code P0430 CHEVROLET - Catalyst System Low Efficiency Bank 2 | Engine-Codes.com
OBD2 - OBDII Code P0300 CHEVROLET - Cylinder Misfire Detected Random Cylinders | Engine-Codes.com
Did you check your o2 sensor? That's what one of the codes was suggesting for. It also would suggest changing the cat.
OBD2 - OBDII Code P0300 CHEVROLET - Cylinder Misfire Detected Random Cylinders | Engine-Codes.com
Did you check your o2 sensor? That's what one of the codes was suggesting for. It also would suggest changing the cat.
February 4th, 2013, 2:34 AM
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Might want to check fuel injectors. Might be dirty. I've been chasing PO 300 for over A yrs. If your cat is bad. Run A can of Sea foam threw brake booster hose.Turn it off for 5 mins. Then start it back up. Should help it out a lot. Hope you can fix yours. Next is the Cam sensor on mine.
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