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Old 10-27-2007, 07:26 PM   #1
02cadiHOE
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5.3 misfire????


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ok my 02 tahoe has the 5.3l flex fuel. ive had it for about 6 months no problems. but just the other day it started to feel like it was losing just a little bit of power not much but noticable and it would shake at idle. finally it through a code and it said misfire cylinder 4. had my mechanic look at it briefly and he said i should change the plugs. did that and didnt help then i bought an ignition coil for that cylinder and that didnt help then wires and that didnt do anything. i even tried moving a coil from a different cylinder thinkin that the new one was bad but you guessed it, nothing. so my question is wtf is the deal with this 4th cylinder!!!??? i dont know what else to replace..... HELP!!!
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Old 10-27-2007, 08:31 PM   #2
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Find a mechanic with a Tech II or similar type scanner. Let him plug in to your computer and find out exactly what's wrong. Might be an injector, who knows. Guessing is useless with computers cars today.
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Old 10-27-2007, 08:32 PM   #3
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Check the connector and wiring that plugs into the ignition module to make sure you have a good connection and that the coil is firing.
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Old 10-28-2007, 10:48 AM   #4
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im pretty sure that the coil isnt getting the signal or voltage it needs...connection at the coil looks good. where exactly is the ignition module?
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Old 10-28-2007, 07:45 PM   #5
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The ignition module or ECM as it is sometimes called is located on the L/F wheelhse panel. It is an aluminum finned case with 3 plugs going to it.
Looks similar to these:
http://www.vectormotorsports.com/
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Old 10-28-2007, 08:46 PM   #6
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[QUOTE=02cadiHOE;14623]ok my 02 tahoe

think you will get better answers in the older model forum... this is 07+

anyway.. wish i could be of help.. dont have the answer
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Old 11-02-2007, 11:52 AM   #7
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Where did you get an 02 with a 5.3 Flex Fuel engine? Flex Fuel wasn't available on the 02 models.
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Old 11-02-2007, 07:27 PM   #8
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i got it used from joe ball pontiac gmc... 2002 chevy tahoe 5.3l v8 vin code Z flex fuel (E85)... easily the first of its kind. also my misfiring problem was due to a faulty fuel injector not dumping enough fuel... found an aftermarket one for $107 and it only took about 15 minutes to install!:thumbsup:
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Old 11-02-2007, 10:13 PM   #9
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Cool. Glad you fixed the problem:thumbsup:
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Old 11-03-2007, 03:50 AM   #10
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Quote:
Originally Posted by wedtwuk View Post
Where did you get an 02 with a 5.3 Flex Fuel engine? Flex Fuel wasn't available on the 02 models.
I also have a 02 with the Flex fuel motor
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