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Code PO305 ... will not go away

chuckbattams

chuckbattams

New member
My 98 GTP is ... well for a better word "Pissing" me off.
I have Code P0305 ... Cylinder 5 misfire detected ... Mod $10
The engine light is on and flashing, not solid.
I have changed Spark plug wires, Spark plug, 2/5 module, ICM, and even went into the headache of changing the fuel injector.
The car is running ... oh lets say 60-70%, I'd go as high as 80% of normal
The car is bogging down a bit, until I changed the fuel injector, is was idling really rough, not ... so so.
I need some help on this, this is the only code she's throwing, and I want to get rid of it, and have my baby back running smoothly ;)

Chuck
 


Clogged cat?

Any mods?

Running 91 or higher octane?

How was the plug that you pulled from #5? I'd suggest a borescope or compression/leak down test to see if the piston isn't chipped or not.
 
@ Blueguy
No, no Mods
The plug that was pulled looked ok, little light brown on the end, and running 91 octane
I changed the crank position sensor, prior to that had cylinder 3 coming up, now that's gone, and replaced with cylinder 5 error code.
Do not know about the Cat ... it's been on since I have had the car, year and a half, rest of the exhaust system has been replaced though. Is there a way to check it?
 
Got someone coming over in an hr or so to check the Cat with a lazer heat reader... will know then if the Cat is the culprit! Even though I don't want to buy a new Cat, I'm hoping it's the cause.
 
Alright, now I'm at a loss..........
We took temp readings of the Cat ... pre Cat 215 degrees and after Cat 345 degrees.
Thats what it is suppose to be, no?
Cylinder 5 still not firing, I disconnected the injector wiring off it when it was running, made no difference, so that proves that the code is lugit :(

Guess I"m stuck with doing the cylinder compression test next
 


Ok, did compression check on the fnt 3 cylinders...

#1 - 85
#3 - 90 and
#5 - 60 Ibs

You think this is enough to make #5 not work, cause it is obviously not working, I pull the injector connection off of it, and have no difference in the way it runs, so something tells me that number five is ....DEAD
 


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