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P0300 code

10K views 11 replies 7 participants last post by  '98-ESer 
#1 · (Edited)
meaning a random or unspecificed misfire with no cyl in particular ID'd.

Got that one this evening after a rough start (weathers been weird the past week or so). Engine eventually smoothed out then the CEL came on.

Everything runs fine, accelleration and 'smoothness' is as usual.

Since I don't have any other codes, and in particular no cyl-specific codes, can I write this one off to bad karma and just clear the codes out next chance I get?
 
#4 ·
Multiple misfires, not indicating any specific cylinders and I'm thinking something central, that would affect all cylinders, like a fuel system problem.

Dr. Dodge is right I think. Clear the codes and see if it happens again. maybe it was a fluke thing, something wet under the hood perhaps.
 
#5 ·
When you try to clear the codes I think you may want to pull the computer fuse from the main fuse box under the hood instead of disconnecting the neg battery cable. I think I read that here recently that it is not preferred to pull the cable to reset the codes but do the comp fuse for same effect
 
#7 ·
On a 98, which of the underhood fuses is for the PCM? There is a 40 amp fuse labelled IGN RUN, another 40 for IGN/RUN, and a 20 for INJ/COIL.
 
#8 ·
For the fused B+ to the PCM it's Fuse "N"(30a) in the PDC.
For the fused B+ to the TCM it's Fuse "Q"(20a) in the PDC
 
#9 ·
Yah, I saw your earlier posts on the letters Ronbo.

How do I tell which fuse is Q, N, or even W??
 
#10 ·
Isn't there a diagram on the inside of the PDC cover? I beleive they're all labeled under there. I'll go look at my 2000 R/T one
 
#11 ·
Just looked...the fuses aren't labeled by letter under the PDC cover. The TCM fuse is labeled and I believe the PCM one might be labeled ASR as it feeds that relay also. The ASR fuse N will be one of the square ones and the TCM is one of the rectangular ones closest to the passengers fender.
 
#12 ·
Yup, that was the one. Many thanks!

And just to collect all the key words into one post....

BCM codes clear pull fuse ASR ASD relay PDC
 
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