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Author Topic: P0307 and sucking oil  (Read 66 times)

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RCBearings

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P0307 and sucking oil
« on: 04/16/18 07:52 AM »

2004 Avalanche 1500 with 240k on her.  Was towing my 26ft travel trailer from Colorado to Austin, TX a couple weeks ago.  Just outside Killeen, I got a check engine light.  Took it to Oreilly and had them read the code.  P0307, Cylinder 7 misfire.  So, I did the cheap thing and hoped.  Replaced the coil, wire and plug.  The plug I took out looked like a lump of coal.  That didn't fix the rough idle or clear the CEL.  Engine temps and oil pressure were still good, so I finished my tow to the RV park and check oil level warning came on.  It was 5 qts low!  Had put in 1qt at Oreilly.  Took it to dealer in Rockdale.  They said 0 compression in Cyl 7 and 90 in Cyl 2.

I know I need a new engine and dealer quoted $7300 installed.  I have been reading up on these engines and came across the 4 corner steam kit.  Seems under hard loads, #7 can overheat causing the ring gap to go to 0 and breaking lands on the piston.  I was flogging her pretty hard so maybe that's the case.

Anything else I should look for?
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ygmn

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Re: P0307 and sucking oil
« Reply #1 on: 04/17/18 04:11 AM »

Did anyone check head gasket?
could be that simple.
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