crayzayness
Probationary Member
- 5
- 0
- Jul 21, 2012
-
Madison,
Wisconsin
I have a 1997 Eclipse GS 420a N/T with 171,200 miles on it that is throwing a P0300 code. I checked out the other posts with this code and none of them have the issue I'm experiencing.
Mods on the car are:
cold air intake
a/c delete
p/s delete
charcoal canister delete
stock exhaust with 5" can on the end
So my car has been throwing the P0300 code since i bought it. Originally when i code tested it, it showed P0301-P0304 as well. In effort to fix it i changed out the spark plugs and tested the wires and coil pack, all of which passed. I got Bosch +4 Platinum plugs. After that the P0301-P0304 codes disappeared but the P0300 remained. Also i replaced the front O2 sensor.
Shortly after i snapped the timing belt and bent the valves. I got a junkyard head with valves and took it to a machine shop to have it resurfaced and checked to make sure it was good to put on my car. The head passed with flying colors and was put on my car with a new timing belt and water pump. After that I noticed a gain in power and fuel economy. Compression testing resulted in 210psi in 3/4 of the cylinders with one cylinder at 185psi. All within spec.
Since then I still have P0300 code, and when I cruise around 3500rpm my CEL flashes at me. When this occurs I have no loss in power, no stuttering or shaking, and no other signs of a misfire. I've monitored the exhaust and have noticed no glowing or rotten egg smell from the Cat. No problems with exhaust pressure either.
I have also recently replaced the Crankshaft Position Sensor and that resulted in the light flashing more often.
The only problems I've noticed with the car are a rough idle (that seems to be effected by changes in the electrical load on the car. Also i just replaced the alternator)
So, I have a P0300 code with no discernible misfire or power loss, and no exhaust issue. Has anyone ever experienced a similar issue or have any suggestions as to what to look into next?
Mods on the car are:
cold air intake
a/c delete
p/s delete
charcoal canister delete
stock exhaust with 5" can on the end
So my car has been throwing the P0300 code since i bought it. Originally when i code tested it, it showed P0301-P0304 as well. In effort to fix it i changed out the spark plugs and tested the wires and coil pack, all of which passed. I got Bosch +4 Platinum plugs. After that the P0301-P0304 codes disappeared but the P0300 remained. Also i replaced the front O2 sensor.
Shortly after i snapped the timing belt and bent the valves. I got a junkyard head with valves and took it to a machine shop to have it resurfaced and checked to make sure it was good to put on my car. The head passed with flying colors and was put on my car with a new timing belt and water pump. After that I noticed a gain in power and fuel economy. Compression testing resulted in 210psi in 3/4 of the cylinders with one cylinder at 185psi. All within spec.
Since then I still have P0300 code, and when I cruise around 3500rpm my CEL flashes at me. When this occurs I have no loss in power, no stuttering or shaking, and no other signs of a misfire. I've monitored the exhaust and have noticed no glowing or rotten egg smell from the Cat. No problems with exhaust pressure either.
I have also recently replaced the Crankshaft Position Sensor and that resulted in the light flashing more often.
The only problems I've noticed with the car are a rough idle (that seems to be effected by changes in the electrical load on the car. Also i just replaced the alternator)
So, I have a P0300 code with no discernible misfire or power loss, and no exhaust issue. Has anyone ever experienced a similar issue or have any suggestions as to what to look into next?