99 silverado codes p0101 p0121 p0300 p0507

hempdogg · **Joined:** Mon Nov 27, 2006 4:59 pm **Posts:** 3

ihave a 99 silverado 1500 4.8 had problm with the idel jump up and down check engen light was on got the code p0101 and p0507 p0300 i replaced the mass flow the light was still on and still the idel was jumpinf up and down tested it agian and still got the same codes p0101 p0300 p0507 and a new one p0121 does any boby have any ideas
i dont have a k and n filter

thax

Sponsored Links · **Joined:** 29 Jun 2004 08:12 pm **Posts:** N/A

jeff compton · **Posted:** Tue Nov 28, 2006 11:15 am

check the intake gaskets for a leak, check the fuel pressure and the egr system for proper operation and be sure the snorkel to the MAF isn't leaking!

hempdogg · **Joined:** Mon Nov 27, 2006 4:59 pm **Posts:** 3

check every thing its good

jeff compton · **Posted:** Tue Nov 28, 2006 2:40 pm

okay then what do you think it is?

hempdogg · **Joined:** Mon Nov 27, 2006 4:59 pm **Posts:** 3

now i have 2 codes p0101 and p0507 and i replaced the mas flow any ideas ?

jeff compton · **Posted:** Wed Nov 29, 2006 4:26 pm

the pcm is seeing too much air coming into the engine! I still say it's one of the things I already suggestted! How did you check any of this!

99 silverado codes p0101 p0121 p0300 p0507

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