JDSS Posted November 24, 2012 Report Share Posted November 24, 2012 Hey Guys, long time lurker and I need some help here. I got the P0300 code about two weeks ago. I've replaced the plugs,wires,cleaned the tb and air filter. Truck runs fine but still throws the code. I've pulled. each coild plug while running and it doesn't even stumble. Where should I go from here? Cats ? 02 sensors? Thanks Joe Quote Link to comment Share on other sites More sharing options...
SSchevySS Posted November 24, 2012 Report Share Posted November 24, 2012 When mine threw a non cylinder misfire code P0300 the EGR was stuck open !!! Dealer replaced the EGR reset the system and have not had a problem since !!! And the truck ran fine as if nothing was wrong !!! Just my .02 Hope this helps !!! Quote Link to comment Share on other sites More sharing options...
JDSS Posted November 24, 2012 Author Report Share Posted November 24, 2012 Thanks for the help. This code is making me crazy! Found a lot of great info using the search feature but it seems like their is a ton of possible problems that could be causing the p0300 random misfire. Was trying to avoid the dealer as my warranty is up. But I guess I just got to bite the bullet and bring it in. Again thanks for the info/ help. Quote Link to comment Share on other sites More sharing options...
Fireman31 Posted November 26, 2012 Report Share Posted November 26, 2012 SS's are not EGR equipped. Have you tried cleaning the MAF sensor? How many miles on the truck? More often then not, a P0300 random misfire code is the beginning sign of a failing Catalytic Converter..... Quote Link to comment Share on other sites More sharing options...
kissfans03ss Posted November 26, 2012 Report Share Posted November 26, 2012 (edited) Hey Guys, long time lurker and I need some help here. I got the P0300 code about two weeks ago. I've replaced the plugs,wires,cleaned the tb and air filter. Truck runs fine but still throws the code. I've pulled. each coild plug while running and it doesn't even stumble. Where should I go from here? Cats ? 02 sensors? Thanks Joe Never pull the wires while the truck is running, those coils produce enough amperage to stop you heart. Sent from my DROID BIONIC using Tapatalk 2 Edited November 26, 2012 by kissfans03ss (see edit history) Quote Link to comment Share on other sites More sharing options...
Blown 346 Posted November 26, 2012 Report Share Posted November 26, 2012 I agree, could be a bad cat. symptoms of a cat going bad are foul sulfur smell out the exhaust, glowing cat, noise that sounds like rocks or loud clicking in the cat, poor gas mileage, poor pickup. Quote Link to comment Share on other sites More sharing options...
SSchevySS Posted November 26, 2012 Report Share Posted November 26, 2012 SS's are not EGR equipped. Have you tried cleaning the MAF sensor? How many miles on the truck? More often then not, a P0300 random misfire code is the beginning sign of a failing Catalytic Converter..... I did not know SSS did not have EGR's !!! I guess the dealer kind of robbed me but I have not had a code set from that day and that was almost 3 years ago, So they fixed it but told me the wrong info on what they fixed !!! Thanks for the info !!! Quote Link to comment Share on other sites More sharing options...
JDSS Posted November 27, 2012 Author Report Share Posted November 27, 2012 SS's are not EGR equipped. Have you tried cleaning the MAF sensor? How many miles on the truck? More often then not, a P0300 random misfire code is the beginning sign of a failing Catalytic Converter..... Really?? Yes. Cleaned MAF sensor when I changed plugs n wires. It has just over 100k miles. Had a cat fail at about 65k. But it's not showing symptoms in any way that I can tell. No smell or noise. Idles great, runs great. Idk? I guess like you said the code is just the beginning. Thanks for help Joe Quote Link to comment Share on other sites More sharing options...
JDSS Posted November 27, 2012 Author Report Share Posted November 27, 2012 Never pull the wires while the truck is running, those coils produce enough amperage to stop you heart. Sent from my DROID BIONIC using Tapatalk 2 I know that was extremely stupid. Lessen learned. Thanks Quote Link to comment Share on other sites More sharing options...
Blown 346 Posted November 27, 2012 Report Share Posted November 27, 2012 Have you tested the MAF? i got that same code when mine went to crap. Heres how.... http://easyautodiagnostics.com/testing_maf_sensor/maf_sensor_testing_1.php Quote Link to comment Share on other sites More sharing options...
JDSS Posted November 27, 2012 Author Report Share Posted November 27, 2012 No I haven't. Just cleaned it. Didn't know I could. Thanks awesome link. I'm gonna test it tmrw. Quote Link to comment Share on other sites More sharing options...
Blazerdave2000 Posted December 10, 2012 Report Share Posted December 10, 2012 Any new news on this code? How did u make out? Quote Link to comment Share on other sites More sharing options...
chawkins6789 Posted December 10, 2012 Report Share Posted December 10, 2012 I am curious of this too, my truck just threw the P0300 today. Sent from my DROID RAZR using Xparent Red Tapatalk 2 Quote Link to comment Share on other sites More sharing options...
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