RE: 2001 DTS Engine misfire detected... why?

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RE: 2001 DTS Engine misfire detected... why?

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RE: 2001 DTS Engine misfire detected... why? - 6/23/2008 1:48:51 PM

summitgirl

Posts: 21
Joined: 6/22/2008
Status: offline

We haven''t tried a new fuel filter. YET. Trying to work our way up from least $$ to whatever we need to do. Can tell you that the service engine light was blinking before new plugs went in , now, it''s steady. Husband says it still seems like it''s running on 7 cylinders. Going to take it back apart and switch a "wire" (from the coil pack to plug) to see if a problem lies there. when he steps on the gas pedal, it goes up to about 4000rpms and then drops down....? I''ll let you know how our white pearl beast makes out.
Kim

(in reply to Katzmans Caddy)

Post #: 11

RE: 2001 DTS Engine misfire detected... why? - 6/23/2008 2:06:08 PM

G.A.R.Y.

Posts: 1619
Joined: 2/18/2007
Status: offline

Was there an engine wash before this problem started? That can kill a bank of coils.

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Post #: 12

RE: 2001 DTS Engine misfire detected... why? - 6/23/2008 3:16:29 PM

summitgirl

Posts: 21
Joined: 6/22/2008
Status: offline

No, no engine wash. It just happend out of the blue. Fine one day, the next it wasn''t bazerk at McDonalds. We''re putting on a new fuel filter now. I realy hate spending $$ if it''s not the coil pack. Like I said earlier, it seems to be running on less than 8 plugs. Hubby took it apart to see what the new plugs looked like and the 2 of the four seemed like they were brand new, while the other 2 looked carboned up. ???? Put the cleaner in the tank. What''s next?
thanks for ALL your help and suggestions!!
Kim

(in reply to G.A.R.Y.)

Post #: 13

RE: 2001 DTS Engine misfire detected... why? - 6/24/2008 9:35:51 AM

summitgirl

Posts: 21
Joined: 6/22/2008
Status: offline

Reporting in to say that she''s still running rough. Put a new fuel filter on and didn''t do any good. What can be the reason for at the first attemp to change the plugs, 7 of 8 looked good. 1 was black and carboned up. Put new in and then 4 of 8 looked good. 2 didn''t look as if they were giving any spark and the last 2 were all black and carboned up. I pulled the codes again and it still gives me the general code of P0300, "engine misfire detected". ?????

Kim

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Post #: 14

RE: 2001 DTS Engine misfire detected... why? - 6/24/2008 1:24:00 PM

Katzmans Caddy

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Joined: 12/3/2006
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I suggest checking the spark plug boots for cracking and proper connectivity, replace if needed. Make sure coil assembly is reinstalled properly. If all of this fails then you need to isolate which cylinder(s) are misfiring and this will mean going to a shop.

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Post #: 15

RE: 2001 DTS Engine misfire detected... why? - 6/26/2008 12:36:42 PM

summitgirl

Posts: 21
Joined: 6/22/2008
Status: offline

Ok,
this is what we ended up doing, it''s a personal issue now....the plug that showed no fire, we switched a fuel injector over to that plug and that is now fireing. It looks like a faulty fuel injector.
It''s now on order and I''ll check in tomorrow morning with the results.
Kim

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Post #: 16

RE: 2001 DTS Engine misfire detected... why? - 6/27/2008 6:22:44 AM

stomper

Posts: 1375
Joined: 6/18/2007
Status: offline

O-Rings are cheap .. a ''91 car will have rubber parts over 15 years old, with rubber parts that are seeing the end of their life cycles.

no wires? the injectors dont have wires?

steel wool .. a NO-NO on electrical parts, specially plastic or aluminum .. the use of steel wool on any surface except S.S. will leave microscopic steel particles embedded in the material which will later promote rust or an electrical path. next time use a non-metallic fiber scouring pad & Bar Keepers Friend. in fact, you may want to re-clean with it as it will remove off the steel particles left behind.

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RE: 2001 DTS Engine misfire detected... why? - 6/27/2008 7:47:59 AM

Katzmans Caddy

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All good advice Stomp.

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RE: 2001 DTS Engine misfire detected... why? - 6/27/2008 8:23:48 AM

summitgirl

Posts: 21
Joined: 6/22/2008
Status: offline

Great! After reading this to my husband he says, "that''s true"....... (about the steel wool factor) Bar Keeper''s Friend is a good product.
anyway, going to let the car cool down and out the new injector on. Got new o-rings. car is 7 years old, was running fabulous till this occurance.

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Post #: 19

RE: 2001 DTS Engine misfire detected... why? - 6/27/2008 11:39:36 AM

Backline

Posts: 1
Joined: 6/27/2008
Status: offline

This is the exact same problem I ran into earlier this week, I have not had a chance to troublshoot the problem with work and all but did the fuel injector work out for you?

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Post #: 20