2001 DTS Engine misfire detected... why? (Full Version)

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2001 DTS Engine misfire detected... why?

  

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

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

  
Katzmans Caddy -> RE: 2001 DTS Engine misfire detected... why? (6/23/2008 7:29:13 AM)

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

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

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

Katzmans Caddy -> RE: 2001 DTS Engine misfire detected... why? (6/23/2008 11:35:44 AM)

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.

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

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

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

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

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

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

Katzmans Caddy -> RE: 2001 DTS Engine misfire detected... why? (6/23/2008 12:47:24 PM)

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.

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

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.

Katzmans Caddy -> RE: 2001 DTS Engine misfire detected... why? (6/23/2008 1:40:43 PM)

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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