Ricky_GD

Right im having big problems with my LS1 in my GD cobra it car. it has a slight misfire on part throttle at low revs, i have changes plugs leads coils compressions at 190-200 psi only code i get somtimes is p0300, im running out of ideas on as to what this could be. could i have a bad pcm? fuel pressure is at 58psi and have 0280155890 injectors ( is this correct for a 2000 ls1?)

thanks

SS2win

iTrader: (11)

pcm rarely goes bad. Have you searched? First two hits on google...

http://www.obd-codes.com/p0300

http://www.random-misfire.com/

Ricky_GD

i have searched everywhere still cannot find the problem. is this a problem that can be caused by an ecu being faulty?

1bad lad

post up your file

Ricky_GD

do you mean the map thats in the ecu? i havent tried reading this yet, i think its a standard file but as the engine was a cut out there could be anything in there. i may have some equipment at work that can read the file. will try post it up tommorow.
cheers

kirkjames90

iTrader: (5)

mine did exactly as urs did problem was the o2 sensors
i made the mistake of buying some shitty ones that lasted about 4months since i had no cats i replaced the front ones with the backs ones and havent had the problem since

TedsB4Csled

iTrader: (6)

I have similar problem. I get PO300 under heavy acceleration. It starts to miss BAD. I have replaced plugs 3X, wires 2X, O2 sensors...etc. It has been going on for months! I may try another set of O2s, but first coil check. I'm glad my other car is reliable.

SS2win

iTrader: (11)

Have you checked your Fuel Pressure? I ran into a problem with the factory regulator that caused the pressure to drop over a certain rpm. Fixed with a aftermarket FPR.

1bad lad

check your grounds, check your wiring to the crank sensor

TedsB4Csled

iTrader: (6)

Thanks. Will do! Have a Happy New Year!