Fixing the dreaded P0300!!!!

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Nov 18, 2014 | 8:36 PM

#21

burhead1

CF Junior Member

Joined: Nov 2014

Posts: 62

Likes: 0

From: Noth of Barrie

Quote:

Originally Posted by Agent_Orange

I give up! I got no other leads to go on. pulled the spider again and the injector was clean as a whistle after the seafoam treatment. she has spark, great compression, fuel pressure is steady, valve train looks good. Still a misfire on #3 per the code but she idles and drives fine now. reflash the computer???

Ok so i am new to the forum and I was fookedup as I saw the post by in2pro and he has 2007 tahoe by his avatar. I took that as being the year of yours, sorry. So now i am a little more with it, I was thinking coil over plug, individual injectors etc. So if the spiders in the intake are good and the truck seems to run ok, cap was replace and you have moved plugs and wires around to eliminate the possibility of a bad plug or wire. Then you must have a vacume leak at the intake or you can try doing a (CRANKSHAFT POSITION (CKP) SYSTEM VARIATION LEARN PROCEDURE) you will need a scanner to do this. Most aftermarket scanners will do this, If you had the cam sensor (distributor) out then i would recommend doing the crank learn. You will most likely find it runs smother and may get rid of your code.

Nov 19, 2014 | 7:48 AM

#22

in2pro

Administrator

Joined: Apr 2008

Posts: 7,573

Likes: 47

From: Austin, Texas

Quote:

Originally Posted by burhead1

I saw the post by in2pro and he has 2007 tahoe by his avatar. I took that as being the year of yours, sorry.

You can use the "Garage" feature in your user control panel for your profile of the forum... using this makes it very helpful for others to know what make, model, year and engine is being discussed in your post and can save a lot of confusion...