2001 DTS Engine misfire detected... why?

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2001 DTS Engine misfire detected... why?

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2001 DTS Engine misfire detected... why? - 6/22/2008 11:20:12 AM

summitgirl

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

Hi, Figured out why the car is acting like it is....pulled some codes as in last post, and came up with "engine misfire detected". OK, now what? It doesn''t give me a specific code for what cylinder, just the PCM P0300 code. How do I fix the problem??? (the other codes I had listed I can live with, mainly tire pressure sensors...garage broke it)

Thanks all,
Kim

Post #: 1

RE: 2001 DTS Engine misfire detected... why? - 6/23/2008 7:29:13 AM

Katzmans Caddy

Posts: 1268
Joined: 12/3/2006
Status: offline

A full scan would pinpoint the cylinder at the shop. Misfire can be a few things:
1. Plugs
2. Coils
3. Fuel Filter
4. Air Filter
5. Wrong octane gas
6. Dirty Mass Air Flow

(in reply to summitgirl)

Post #: 2

RE: 2001 DTS Engine misfire detected... why? - 6/23/2008 8:30:50 AM

summitgirl

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

Hi,
Ok, took the first 4 plugs out, found the fourth was the problem (so far). IF we put a good one on the fourth and that goes bad, does it necessarily mean that that is the problem?? Trying to self-fix. Could the fuel injectors just be dirty??
thanks,
Kim

(in reply to Katzmans Caddy)

Post #: 3

RE: 2001 DTS Engine misfire detected... why? - 6/23/2008 11:35:44 AM

Katzmans Caddy

Posts: 1268
Joined: 12/3/2006
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I think you are doing the right thing, start with the plugs, all 8 and see what happens. Wires can get pricey but it would be good to change them too. You could try a bottle of fuel injector cleaner too.

< Message edited by Katzmans Caddy -- 6/23/2008 11:45:54 AM >

(in reply to summitgirl)

Post #: 4

RE: 2001 DTS Engine misfire detected... why? - 6/23/2008 12:28:21 PM

summitgirl

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

Hi,
got the plugs out, finally!! what a set up! anyway, 1 bad plug...looked at fuel injectors, they had some crud, steel wooled them clean, NOW the problem is the fuel injectors are SPEWING gas when key engaged. is there a specific way to reattach them?????? Hubby is at wits end...and he is very mechanical.
thanks, kim

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Post #: 5

RE: 2001 DTS Engine misfire detected... why? - 6/23/2008 12:44:55 PM

summitgirl

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

Hi, no wires in this car....just found out the o rings may be shot on the fuel injectors.... we''ll let you know what happens. Great way to spend the day, hunched over an engine.

Thanks for the help! Kim

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Post #: 6

RE: 2001 DTS Engine misfire detected... why? - 6/23/2008 12:46:03 PM

summitgirl

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

...also gto a bottle of fuel injector cleaner.

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Post #: 7

RE: 2001 DTS Engine misfire detected... why? - 6/23/2008 12:47:24 PM

Katzmans Caddy

Posts: 1268
Joined: 12/3/2006
Status: offline

It only takes one bad plug but Ouch, I''''m not so sure steel wool is the best idea on injectors. Anyway the injectors will pop in but make sure the O rings are not damaged and put a little clean engine oil on the injectors O rings with you finger when reinstalling. Really should have new O rings. Run fuel injector cleaner in gas tank.

Thanks on wires, on my first post I did not include them in the list but on second I forgot it was a 2001.

< Message edited by Katzmans Caddy -- 6/23/2008 1:08:49 PM >

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Post #: 8

RE: 2001 DTS Engine misfire detected... why? - 6/23/2008 1:23:57 PM

summitgirl

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

Sorry, it wasn''t the injectors the wool was used on, it was the coils. Hopefully that wasn''t a boo-boo...anyway, they''re nice and shiny now. put the cleaner in the tank. the o rings were stuck up in the cap. didn''t see them right away. Husband took the car for a test ride...i''ll get back to tell you how we made out.
Thanks again.

well, it still running rough.

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Post #: 9

RE: 2001 DTS Engine misfire detected... why? - 6/23/2008 1:40:43 PM

Katzmans Caddy

Posts: 1268
Joined: 12/3/2006
Status: offline

Coil pack. It might look shinny but still could be bad. What about a fuel filter. How is car on wide open throttle?

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Post #: 10