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Post by JonnyGT on Mar 17, 2009 23:15:26 GMT -5
so much clutch is now in the mustang, i put a spec stage two, and a new billet steel flywheel. that went in with out a hitch. however the car will not idle. constant backfires sounds like a leaking intake manifold, hoping its not valves or worse. just back fires and sputters stalls out under 3 grand. i dunno, I'm going to figure out whats wrong with it tomorrow in class.
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Post by ScrapinSTi on Mar 18, 2009 5:35:44 GMT -5
is it throwing a code? Did it do it as soon as you put the clutch in? Could be an unbalanced flywheel causing bad misfires
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Post by dale clough on Mar 18, 2009 7:25:51 GMT -5
This is a question, please do not flame me out...
Is the crank sensor on the front (harmonic balancer) side or the rear (flywheel) side of the motor?
A faulty sensor could through everything out of time. A poorly positioned sensor would set-up the low-idle condition you are seeing.
Just a question.... I have never looked at my 4.6L so I don't know the answer.
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Post by ScrapinSTi on Mar 18, 2009 20:10:02 GMT -5
A crank sensor is on the front of the motor... But if the flywheel is unbalanced, it can wobble the crank, & the dampener, and screw with the crank position sensor..
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Post by JonnyGT on Mar 18, 2009 20:26:47 GMT -5
This is a question, please do not flame me out... Is the crank sensor on the front (harmonic balancer) side or the rear (flywheel) side of the motor? A faulty sensor could through everything out of time. A poorly positioned sensor would set-up the low-idle condition you are seeing. Just a question.... I have never looked at my 4.6L so I don't know the answer. on the 4.6 the ckp is on the harmonic balancer
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Post by JonnyGT on Mar 18, 2009 20:27:53 GMT -5
it happened when the clutch blew out, i just hope i didn't over rev it.
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Post by ScrapinSTi on Mar 18, 2009 20:43:19 GMT -5
before the clutch blew? Did the clutch literally BLOW? Or did it just let go? Did you keep driving after?
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Post by JonnyGT on Mar 18, 2009 22:36:58 GMT -5
its slipped real hard at the track drove it home, two days later it sounded like bad breaks squeaking then just no engagement and a puff off black smoke engine was fine till i tried to start it in my drive way over winter , that's when i noticed problems and when the clutch went in yesterday same thing . at least 4 different ford technicians think i floated a valve or mess up a follower
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Post by JonnyGT on Mar 18, 2009 22:38:06 GMT -5
BTW, can any figure out for me why i started a sentence with so much . lol im dense
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Post by JonnyGT on Mar 18, 2009 22:58:38 GMT -5
some pics of the new Vs. old parts Pressure plate side Flywheel side spec stage 2 FWside old FW New FW new vs old pressure plate surface new vs. old pressure plate front
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Post by ScrapinSTi on Mar 19, 2009 5:27:32 GMT -5
Puff of smoke might be the hint... You very well could have floated a valve... Time for a leakdown test!
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Post by JonnyGT on Mar 19, 2009 18:45:33 GMT -5
im doing a relative compression test tomorrow. at least i get to fix it in school with certified ford techs as my instructors
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Post by JonnyGT on Mar 26, 2009 20:04:35 GMT -5
well everything test good. im stumped to know whats cause this issue. guess its time to tear down valve train.
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Post by ScrapinSTi on Mar 26, 2009 20:08:18 GMT -5
Did you do compression or leakdown test?
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Post by JonnyGT on Mar 26, 2009 22:13:45 GMT -5
yeah everything is normal. thats why its throwing me off. like boreoscope looked fine. cyl leak down was good manual compression was good it just suck cause the car wont run under 2-3 grand so its hard to perform test the right way. i dunnno im going to have a specialist from the school look at it .
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Post by ScrapinSTi on Mar 27, 2009 17:26:11 GMT -5
Are you sure its something motor, not something stupid like a bad MAF or something?
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Post by skimobile on Mar 27, 2009 19:15:41 GMT -5
I was thinking the same thing : P
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Post by JonnyGT on Apr 2, 2009 0:02:02 GMT -5
underside of intake manifold, intake valve was stuck open causes exhaust to backfire into the manifold and melt it.
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Post by antagonistace on Apr 2, 2009 0:54:55 GMT -5
Holy crap! Thats some nasty damage there. I am glad you found the reason behind the trouble.
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Post by dale clough on Apr 2, 2009 8:27:50 GMT -5
Engineer time;
That picture shows the result... what was the cause and how quickly can you fix it?
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Post by skimobile on Apr 2, 2009 19:32:36 GMT -5
Damn man, that one looks extra crispy... Time for a ported intake manifold and some head work. Hows the rest of the engine?
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Post by peter91118 on Apr 3, 2009 10:01:19 GMT -5
that suckssss. how long did you run it to do that? that plastic is high temp stuff too. and at least it didnt melt your MAF as well.
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Post by Team Avanti on Apr 7, 2009 19:25:40 GMT -5
wow
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