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Unread 11-16-2012   #1 (permalink)
TheHatter80 is offline Rookie


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Default Mystery 0f the 2002 GT continued.

OK,guys...Gimme some thoughts and input..Got a 2002 Mustang GT 5spd. MIL light came on about 4 years ago after I had some tranny work done...No effect on performance occured.Codes indicated rear O2 sensors,so I replaced them,MIL light remained on,still no effect on performance..Fast forward a year,Engine burnt up due to overheating( stupid desperate move,nuff said). Had engine replaced with a 2004 engine,with 32,000 miles on it.. MIL light still on,same codes,replaced o2 sensors again,no change...Car runs strong,no loss of power,never would guess engine was swapped.Janurary this year,it begans to have a slight miss at cruising speed..Summer this year,It starts to run hot,but I do the right thing and pull over immediately as soon as temp gauge starts climbing past normal operating temp.Bad thermostat,swapped it,back to running(still misses at cruising).Couple of months,later-Slight miss turns into noticeable miss,Mil starts flashing periodically.within a month it jus bogs past half throttle,doesnt like to rev over 4000rpm,wreakes of raw gas when you put the pedal down... Had alternator serviced for bad diodes,extensive data logging(indicated same o2 codes,plus miss on number 7,cam sensor code). Find out intake had delaminated around rear water jacket,and a blown head gasket right at number 7..... New Intake,Head gasket repaired,COP replaced,spark plugs replaced,MAF checked and cleaned,and to NO AVAIL! Same symptoms,add the fact-Vaacum hose will blow off exhaust tube on back on engine if you stomp it.Also,If you stomp it,when it returns to idle,it is idling insanely rough( flop,flop,flop)*best I can describe it*..tap the gas and smooth idle returns... JJEEEZZ,HELP!!!
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Unread 11-16-2012   #2 (permalink)
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Could be corrosion across your ecu caused from moisture over time.
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Unread 11-16-2012   #3 (permalink)
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aite..cool..thats not a problem to check out and address.Got a friend that is an Electronics repair tech.With all the gear for such repair,anybody could think of! Anymore Ideas? please keep em' coming,I will make a punch list.
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Unread 11-16-2012   #4 (permalink)
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Part of the problem could be bad catalytic convertors.

Bad cats will cause..... Misfire-like symptoms, overheating, lack of power due to being plugged up, and dtc's for rear O2 sensors. All of which apply to you. I think you may have replaced those rear sensors not once, but twice, in vain. Their job in life is to measure catalyst efficiency. If the cats are not working as they should, you will get a code for those rear sensors. I know it doesn't help at this very moment, but any time an O2 sensor code pops up, the first thing that one should do is find out why, not jump to the conclusion that the sensor is bad and replace it. More often than not the sensor is just doing it's job. Just about every thing you mentioned could be attributed to excessive restriction in the exhaust; that vacuum line that pops off when you hit the happy pedal, well that just might be exhaust gasses trying to find the path of least resistance.
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Unread 11-16-2012   #5 (permalink)
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There is the reply,I was looking for!!!.. Was told by a mechanic friend that the fact antifreeze was probably introduced into exhaust that it sealed the fate on the cats....Couple of days later,He stopped by and I let it run and revved on it,while he put his hand over end of exhaust pipes..said almost no pressure was there.. and taking in the fact the vacuum hose would blow off,he was dead set on it... Lastly,I have had several strangers approach me,commenting on how quiet that mustang was... So,this weekend-Making up some MIL eliminators and its bye-bye CATs time!.... Jus wanted some Mustang specific input on it,before I made the move..crossing fingers...Ima go head and check out my ECU boards and connectors since I have the means,also..Thanks Fellas!... Any more input is appreciated..Ill post the verdict ASAP.
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Unread 11-16-2012   #6 (permalink)
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No problem glad to help.
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Unread 11-16-2012   #7 (permalink)
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No problem, glad to help.
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Unread 01-23-2013   #8 (permalink)
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Well,finally got those cats off.....And lemme tell ya..... WOW! I own a GT again!! Damn the power is 110% and it sounds wicked! I've had those Flowmaster series 40 on for several years ,before all the trouble ever began.It never had the sound it has now..Man,I just never imagined something so simple could cause this much headache.. Alllright,time to blow the dust off the ole upgrade plans.My ride is ready.
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Unread 01-23-2013   #9 (permalink)
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I'm very happy that you put a end to this post. Maybe it will help someone else in the future. Thank-u!!!
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