P0300 random cly mis-fire
11-29-2003, 02:32 PM
#1
On The Tree
Thread Starter
Join Date: Oct 2002
Location: Vidor,Texas
Posts: 103
Likes: 0
Received 0 Likes
on
0 Posts
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
11-29-2003, 10:18 PM
#4
Restricted User
iTrader: (2)
Join Date: Dec 2001
Location: New Zealand
Posts: 424
Likes: 0
Received 0 Likes
on
0 Posts
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
11-30-2003, 02:48 PM
#5
Staging Lane
Join Date: Nov 2003
Location: HOUSTON
Posts: 62
Likes: 0
Received 0 Likes
on
0 Posts
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