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Bad injector?

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Old May 17, 2009 | 02:27 AM
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Default Bad injector?

Could anyone tell me what are some signs of a bad injector? Thanks
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Old May 17, 2009 | 09:32 AM
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No rpm change when unplugged.
Wet plug.
No sign of combustion on the plug.
Fast drop of FP when engine is turned off.
Low egt on that cyl.
Skewed readings on the datalogs.
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Old May 17, 2009 | 05:20 PM
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Could a bad injector cause the P0300 code??
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Old May 17, 2009 | 10:27 PM
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Originally Posted by Old Geezer
No rpm change when unplugged.
Wet plug.
No sign of combustion on the plug.
Fast drop of FP when engine is turned off.
Low egt on that cyl.
Skewed readings on the datalogs.
I recently changed plugs and one of them was completely covered in gunk of some type, and was wet. Could this possibly be the bad injector?
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Old May 17, 2009 | 11:05 PM
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Originally Posted by WhitePhoenix99
I recently changed plugs and one of them was completely covered in gunk of some type, and was wet. Could this possibly be the bad injector?
its oil ?
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Old May 18, 2009 | 01:16 AM
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Originally Posted by killagt
its oil ?
I'm not sure if it was oil, I don't think it was. It was a thick gunk of some type. I'm not really sure how to explain it.
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Old May 18, 2009 | 07:03 AM
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U still have that plug? If so, post a couple good pics. Maybe we can get an idea of what it is.
Was the gunk wet, burned dry, sticky, hard crust??
Engine using oil?
" " coolant?
Unplugged the plug wire on that cyl? If so, what happened?
Do a compression check?
NE codes set?

Last edited by Old Geezer; May 18, 2009 at 07:09 AM.
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Old May 18, 2009 | 07:08 AM
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Default Yep..

Originally Posted by boola1341
Could a bad injector cause the P0300 code??
0300= random/multiple cylinder misfire..
Suggest you start your own thread. That way, we'll not be chasing 2, possibly different problems...
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Old May 18, 2009 | 01:54 PM
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Originally Posted by Old Geezer
U still have that plug? If so, post a couple good pics. Maybe we can get an idea of what it is.
Was the gunk wet, burned dry, sticky, hard crust??
Engine using oil?
" " coolant?
Unplugged the plug wire on that cyl? If so, what happened?
Do a compression check?
NE codes set?
Well I got rid of the plug when I changed them but the gunk was wet and sticky, it was pretty thick. I don't see how it was even firing really. The only codes its throwing are two o2 sensor codes and egr malfuntion. The cats are removed along with the egr and air pump.

The car only misses out after converter lockup when I give it part throttle. If I continue to give it throttle it will clear up until higher rpms and then start to miss again. Also it only does this after the car has reached operating temperature.
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