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Go Back   Hummer Forums by Elcova > Hummer H2 Discussion Forums > Technical Discussion and Customizing your H2

 
 
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Old 10-10-2010, 03:45 PM
HMH2SUT HMH2SUT is offline
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Default another p0300 question

I know there is many posts about p0300, i just searched and read them all.
Yesterday I started up my SUT after not driving it for more then a week, it fired right up but gave a big puff of smoke at first. I pulled out and felt and misfire right away, hit 35-40 mph and engine light started flashing. On my way back home i heard a pop that i have never heard before from the front passenger side...
I brought it back home and scanned it, I am showing p0300 and p0300 pending also i have 3 incomplete IM monitors showing EVap,O2 sens,Catlyst.

After reading all the old post i dont know where to start... from what i read it could be anything from dirty fuel, bad cats, dirty injectors, leaking intake etc...

so my ??? is where should i start? I refuse to take it to a stealership, Theres no job i wouldnt try to tackle myself but I dont wanna throw hundreds of $$ into the wrong hole you know what i mean? My scan tool is cheap just shows the code, would a better scan tool with live monitoring give me a better diagnosis ?
any help is appreciated as always thanks!

PS all plugs and wires are tight, cleaned MAF sensor reset codes same story..
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