5.0L (1979-1995) Mustang Technical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.

detonation and CEL!!

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Old 09-15-2006, 03:45 PM
  #1  
fordguy17
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Default detonation and CEL!!

So i was coming home from work the other day and decided to get on it a little bit.

it got to about 3500 rpm in second gear at half throttle when i heard loud detonation coming from the left side accompanied by a bad smell and lots of smoke.

then my check engine light came on. (it had been turning on/off prior)

my car has been running fine since if i'm easy but wil start to detonate again under load. i have not messed with the timing and can't verify it right now b/c i don't have a light.

i pulled plugs this morning and they all seem a bit lean except for number 6 which is extremely white. i guess that cylinder is detonating? why only that one?

also i tried to get my codes pulled but autozone and advance say they only do 96 and up[&:] (OBD II)

where can i get them pulled? NAPA?

thanks all!
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Old 09-15-2006, 03:50 PM
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grabbem88
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Default RE: detonation and CEL!!

self test buddy....a little wire your small dio plug and a ground..i use hood hinge..turn key and count..

why only #6?....clogged injector most likely
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Old 09-15-2006, 04:01 PM
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fordguy17
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Default RE: detonation and CEL!!


ORIGINAL: grabbem88

self test buddy....a little wire your small dio plug and a ground..i use hood hinge..turn key and count..

why only #6?....clogged injector most likely

cool.

could you elaborate on the self test? count what?
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Old 09-15-2006, 04:03 PM
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grabbem88
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Default RE: detonation and CEL!!

check engine light flashes..you know what small plug i'm talking about right?..
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Old 09-15-2006, 04:08 PM
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r.barn
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Default RE: detonation and CEL!!

you can pull the codes yourself by jumping a small plug on the driver firewall
and then counting the flashes of the CEL to get the code number.

the computer can run a cylinder check thru this also where it will turn on and off
each cylinder and check make sure they are all firing properly.


Here's how you do it

http://www.corral.net/tech/maintenance/eecivtest.html
thats the link you need.
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Old 09-15-2006, 04:26 PM
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fordguy17
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Default RE: detonation and CEL!!

cool. thanks alot!
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