01-04-2007, 03:43 AM
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?
Last edited by '98-ESer; 01-04-2007 at
01-04-2007, 03:54 AM
Sorry bro, all I can recomend is coils/dist./plugs. :(
P.S - 300 = Random/Multiple Cylinder Misfire Detected
As much as I hate it, try a stealership?
01-04-2007, 10:32 AM
clear the code and give it a shot,, if it pops back up try the plugs etc,, but if its running smooth and the light is not flashing you got nothing to loose
01-04-2007, 10:40 AM
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.
01-04-2007, 11:22 AM
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
01-04-2007, 04:47 PM
Join Date: Oct 2006
Kansas City Metro
Model: Motorsports Edition
Try clearing the codes, if it pops back up start cheap and just go from there.....
01-04-2007, 05:13 PM
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.
01-04-2007, 06:03 PM
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
01-04-2007, 06:09 PM
Yah, I saw your earlier posts on the letters Ronbo.
How do I tell which fuse is Q, N, or even W??
01-04-2007, 06:51 PM
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
01-04-2007, 07:01 PM
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.
01-05-2007, 06:13 PM
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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