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Discussion Starter · #1 ·
hi,

Im trying to diag a misfire on my 01 9-5. Ive replaced the DIC and CPS

DIC is know good one and CPS in new. still get P1312 and another misfire code.

cars drive pretty normal but on occasion will hesitate and stumble abit. doesnt happen everyday thou its very odd. completely at random.

I hooked up my code reader and these are the numbers im getting.

short fuel trim is at 25%. to me this is to high? should it be under 15%.

long term fuel trim is at 0% and this is after the car is warmed up and just at idle.

02S1 is at .050 and switch +/- .015
02S2 is doing roughly the same.

should the 02 after the cat be flat lined as its only used to check the efficiency of the converter?

someone chip in. thanks guys.
 

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25% is way high. you idealy want to be +/- 5% for short term.

id would first start looking for some air leaks. see if STFT changes when you hold down the brake pedal too

typically p1312 and a misfire code would point to DIC. i guess check the plugs for anything abnormal

o2 readings are a little off but thats because of the fuel trim and the misfire

and o2 sensor 2 should be flatlined but mayb the cat wasnt hot enough yet
 

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Discussion Starter · #3 ·
25% is way high. you idealy want to be +/- 5% for short term.

id would first start looking for some air leaks. see if STFT changes when you hold down the brake pedal too

typically p1312 and a misfire code would point to DIC. i guess check the plugs for anything abnormal

o2 readings are a little off but thats because of the fuel trim and the misfire

and o2 sensor 2 should be flatlined but mayb the cat wasnt hot enough yet

yea i figured it was way high.

i smoke tested the car the other day at work and found no leaks.

yea i pulled p1312 awhile ago and thats why i got the new(to me) dic. I let a friend use it for 2 days and it didnt throw any codes so its gotta be good.

i wish my code reader showed graphs and not just numbers.

i will drive around tmrw with the code reader and see if the o2s are switching normal.
 

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Spark plugs are fouled; clean or replace them.
 
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