: 01Deville MISFIRE



VABeach01Deville
07-15-07, 02:28 PM
I recently purchased an 01 Deville, a few days of driving and the check engine light started flashing on and off. the onstar diagnostics said it was possiable misfire..any suggestions . is this a problem i can fix on my own . if so what are the steps..Thanks

AJxtcman
07-15-07, 02:38 PM
I recently purchased an 01 Deville, a few days of driving and the check engine light started flashing on and off. the onstar diagnostics said it was possiable misfire..any suggestions . is this a problem i can fix on my own . if so what are the steps..Thanks

Do you know what cylinder is misfiring?

VABeach01Deville
07-15-07, 02:47 PM
no, i cant really hear a misfire when i accelerate so im assuming it is only one cylinder. havn't gotten formal diagnostic ran yet.

AJxtcman
07-15-07, 02:50 PM
how many miles on the car?

VABeach01Deville
07-15-07, 02:52 PM
62,243

AJxtcman
07-15-07, 03:03 PM
When did this occure?

AJxtcman
07-15-07, 03:07 PM
Go to this link and read how to get the codes. If you get a PCM DTC that is a P0301 to P0308 that will tell you the cylinder. If it is just a P0300 you get nothing out of it.
http://www.cadillacforums.com/forums/northstar-performance-technical-discussion/53635-got-codes-look-here.html

VABeach01Deville
07-15-07, 03:08 PM
the day after i bought it and drove it home. im thinking it could be the engine cleaning they did. the engine compartment was pristine. so im almosty positive they cleaned it. you thinkn that could be a possability, just plug boot ?

eldorado1
07-15-07, 03:15 PM
Did you just fill up?

;)

VABeach01Deville
07-15-07, 03:25 PM
yes but it did it before then

AJxtcman
07-15-07, 03:44 PM
I have the engine out of an 00 Deville. It was wrecked bad at one time. The hood must have been off the car for some time. I pulled the coil cassettes off and the electrode had rust on all of them. I know the owners of the car for the last 3 years. It has not had a misfire condition, but The coils are bad.
Water can get down into the boots.

VABeach01Deville
07-15-07, 04:27 PM
all i got was a P0300,

fpmesiIII
07-15-07, 04:54 PM
replace the the spark plugs?

VABeach01Deville
07-15-07, 04:58 PM
no, all ive done at this point is run diagnostics. when i change plugs, does it have to be reset in order for the engine light to go off or does it do it automatically once the problem has been fixed

Ranger
07-15-07, 05:50 PM
The light will go off after 3 ignition cycles with no fault detected, but you can clear it through the DIC after you pull the codes.