P0300

[pettsir]

long story short. i have a reocurring P0300 code after two consecutive highway cruises. i have over time replaced, the plugs-wires-distributer-water pump-coil-ignition module-crank sensor. still have the problem. here is the kicker, i don't feel anything wrong with the car under cruise. it dynoed at 300rwhp stock and runs like a bear. do i have a bum new opti crap? has any one else ever had a similar experience? i doubt the chain is stretched as it is my understanding that the LT4 has a roller chain with steel gears. i feel no tire or driveshaft vibration at all. i'm going to start going after fuel problems now but i wanted to see if it was a common problem or if anyone encountered this before.

 

[6 Shooter]

. . . anyone encountered this before.

Nope not me and I've put about 14K on her ticker in the last few years.

She's setting right @ 38K.

Later . . . . . .
6 Shooter

 

[Hib Halverson]

You know what the code is so you must have run a scan test. What did the freeze frame show?

Do you understand the conditions that must be present to set DTCP0300?

Have you run the diagnostic tests in the Service Manual?

 

[pettsir]

the scan tool i have is just a code reader. but i do understand the conditions for the code to set and know how it works. unfortunatly i don't have ready access to a scan tool that will give me serial data. when the problem occurs the car is at cruise and i don't feel any problem. i have heard that the injectors go bad on these cars. how often is that likely? the car has about 51K on it.

 

[pettsir]

the new plugs that i put in looked like new when i checked them, plus the plugs i originally removed looked very good. i really don't think the car is really missing, or if it is it's not enough to foul out a plug. still think it's a glitch in the new opti-spark i put in, but how can i confirm this without a scanner?