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p0300, random multiple cylinder misfire
Thread Starter
Teching In
Joined: Aug 2003
Posts: 14
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p0300, random multiple cylinder misfire Installed my Pacesetter longtubes and ORY and now I am getting P0300 - random multiple cylinder misfire.
We didn't remove my sparkplugs during the installation, just the spark plug wires. I check all the wires and all of them are plugged in all the way. But I'm still getting the code? Any ideas?
We didn't remove my sparkplugs during the installation, just the spark plug wires. I check all the wires and all of them are plugged in all the way. But I'm still getting the code? Any ideas?
Teching In
Joined: Dec 2003
Posts: 36
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From: Spotsylvania, Va
Originally Posted by Chris222x
Well the car just generally feels like crap when riding around. There is also a pending code p0154 - o2 no response
As far as the P0300- check your wires and plugs. The stock wires break easily.
2 things caused my P0300 code and that was the crappy bosch sparkplugs might have been my gaps dunno tried different settings, and I also replaced my wires with msd. Doing both of those took care of my error code and the surging. I actually went back to the AC Delco.....NGKs are ok with no problems as well.
TECH Addict
Joined: Sep 2003
Posts: 2,065
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From: Atlanta, GA
make sure the pacesetters aren't smacking the kmember/floorboard.
If you have efilive you can actually watch the knock sensor's when you rap the headers with a crowbar and it sets off a code. If you got any bump'ing to the kmember or floorboard you can set off codes.
If you have efilive you can actually watch the knock sensor's when you rap the headers with a crowbar and it sets off a code. If you got any bump'ing to the kmember or floorboard you can set off codes.
TECH Resident
Joined: Jan 2002
Posts: 754
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From: USA
Originally Posted by Z28GSXRTim
That is Bank 2 Sensor 1- The rear O2 sensor on the drivers side. I am not familiar with those headers, but on my Jet Hots there was no place for the Bank 2 O2 sensors. If there isn't, you need to get O2 Simulators or get the Bank 2 O2 codes turned off.
As far as the P0300- check your wires and plugs. The stock wires break easily.
As far as the P0300- check your wires and plugs. The stock wires break easily.
is a front (S1) O2, not a rear.
Bank 1 is always the side of engine that has piston 1 ( which is drivers side of LSx engines) thus bank 2 is where piston 2 is ( passenger side).
S1 is sensor before the Cats (upstream) and S2 is O2 after the Cats (downstream)
Being there is no activity you should check to see if the O2 connectors are mating correctly, has a bad connector pin, or wires broken/burned.
Being it is in a pending state PCM is not sure if there really is a problem but if it ocurrs again then the DTC will be jumped up to a "current" state and then PCM is sure the sensor has a problem.
As to P0300, multi misfires,
its common with headers and is most likely false misfires or AFR is out of wack but in either case best path is to have the PCM calibration tuned which includes the misfire functions.
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