P0300 random cly mis-fire
Thread Starter
On The Tree
Joined: Oct 2002
Posts: 103
Likes: 0
From: Vidor,Texas
P0300 random cly mis-fire Just rebuilt my bottom end and bought MTI head and cam. Had the random miss fire before the rebuild. Reason for the rebuild was had broke ring lands in NO.7 clyinder. Now since the rebuild still get the random mis-fire. Could this be caused by the cam and heads with no tune? Any help would be great. Thanks
It's the H/C and no tune.I would also have it checked out for A/F.There is a slight chance of gas washing a motor with a H/C and no tuning.Would hate to see you eat another short block.
Is it actually misfiring, or is the PCM just incorrectly detecting misfire due to crank position sensor being disturbed during the rebuild?
Maybe all you need is a crank position sensor relearn.
More info here:
http://www.seattleautomotive.com/ckpdoc.htm
Maybe all you need is a crank position sensor relearn.
More info here:
http://www.seattleautomotive.com/ckpdoc.htm
Staging Lane
Joined: Nov 2003
Posts: 62
Likes: 0
From: HOUSTON
Originally Posted by landlord
Just rebuilt my bottom end and bought MTI head and cam. Had the random miss fire before the rebuild. Reason for the rebuild was had broke ring lands in NO.7 clyinder. Now since the rebuild still get the random mis-fire. Could this be caused by the cam and heads with no tune? Any help would be great. Thanks
i did h/c on my friends 99 ss and it would set the code if it would idle for a 5 minutes or longer, the missfire counter is works off of the crank sensor and crank velocity and when you put a cam in it gives the crank velocity and the pcm thinks the engine is miss firing when it is really not. get pcm programmed and it will take car of the problem
