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OBDII Code

jcs44

Well-known member
Joined
Mar 8, 2004
Messages
161
Location
Harvest, AL
Corvette
2003 Z06 Torch Red/Black
This morning the Check Engine light came on in my 96 LT4. While it was still running, I plugged in my code reader and got a 303. A little later, after shutting it off, plugging in the reader, and restarting it, I got 300. I've had this going on for a while, but its always been 300 (random misfire) before. Should I be looking at No. 3 cylinder as the problem?

This misfire goes away very quickly, but still sets the code which I usually just turn off with my reader.

Thanks,
JCS44
96 LT4 Vert, triple black
 

c4c5specialist

Technical Advisor
Joined
May 29, 2001
Messages
3,682
Location
New Haven, Ct. USA
Corvette
Nope, but someday.
HI there,
P0300 is usually when the actual cylinder cannot be fully determined.
Tech 2 data can confirm by giving ACTUAL misfire counts of each cylinder.
YOU should look at #3 first, but do NOT assume thats the only one.
Alllthebest, c4c5
 

jcs44

Well-known member
Joined
Mar 8, 2004
Messages
161
Location
Harvest, AL
Corvette
2003 Z06 Torch Red/Black
I certainly hear what you're saying, but this thing is so intermittant that it goes away almost as fast as it happens. Will the scanner still see it?
 

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