bounceing idle and stalling - Page 5 - MustangForums.com


4.6L (1996-2004 Modular) Mustang Technical discussions on 1996-2004 4.6 Liter Modular Motors (2V and 4V) within.

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Old 03-10-2017, 05:50 PM   #41
tadpole1969
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yup went oem motorcraft plugs its kinda hard to better ford products for sure, same goes for tb also the factory tb seems very Responsive better than the bbk, no big power gains to be had from bbk 78 mm ,unless i go forced induction anyhow or supercharged

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Old 03-11-2017, 06:37 PM   #42
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Glad you got it worked out, i was thinking about getting my car out and now i understand we are expecting 3 -6 inches of snow this week
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Old 03-15-2017, 06:39 PM   #43
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I'm looking at new plugs and coils for my supercharged '01 GT, and all the research I've done both here on this forum and talking to an independent and a Ford mechanic is, at least in my case, to stick with Motorcraft coils and plugs.

On topic, I had a problem with an unstable idle and periodic stalling a couple years ago. New IAC and rectifying a vacuum leak fixed the problem for me.

FWIW I also have the BBK 78mm TB on mine. No issues there that I know of. Just need to scrape together the funds for a proper Ford Racing PI intake manifold to replace the Dorman garbage previous owner installed...typical failure at the coolant hose port has leaked coolant into the back right spark plug wells causing misfire. Arg.
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Old 03-16-2017, 07:56 AM   #44
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Yup i have the ford raceing pi intake had to replace factory intake dureing cam install due to water hose fitting crack , the bbk tb was good for awhile on mine but went south after couple cleanings think main prob with my bbk tb was it was sticking , had rpms hanging really bad , which led me to removeing it to see if it would solve issue and sure enough wala!!
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Old 03-21-2017, 10:33 PM   #45
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well the idle surgeing still remains thought changeing tb fixed the issue but nope , so now im leaning toward timeing issue or a torque conveter issue ,gonna take in to local shop tommorow tired of pulling my hair out trying to figure it out
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Old 03-21-2017, 11:13 PM   #46
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Bummer, man...that's frustrating!

You're *sure* it's not the IAC valve? Like maybe the replacement isn't working right?
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Old 03-22-2017, 06:32 AM   #47
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well its less than a month n half old when i unplug iac while idleing it trys to stumble and die ,so its doing whats its suppose to but could be sticking

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Old 03-22-2017, 06:16 PM   #48
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Got to be a vacuum leak, double check all hose connection, how old are the vacuum lines fairly inexpensive to just replace them all

Dam, though you had it
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Old 03-22-2017, 07:07 PM   #49
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did some more looking around today and have been watching 1 wet area around one injector that hasnt dryed up in 3 days ,figured it would have dryed by now ,so gonna check that out tommorow , could be that its not seated well and causeing my issue , started to take it to local shop today but holding off to see if some how i can fix it my self
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Old 03-24-2017, 07:03 PM   #50
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well at my wits end guess its going to shop monday, if they even say they cant fix it if theres no check engine light, im gonna nut the hell up! LOL

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