while driving rpm's drop engine stumbles then dies, 1992 Mustang 5.0
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hey I have the same heads as you and when I first got it started I had some of the same problems. when you adjusted you rocker arms make sure you tighten down the poly locks on your rocker arm bolts good, also if you just put on the TB make sure you adjust the idle on it.
thanks for the feedback, i will check everything you mention. what rpm r u idling in drive, park ect. also i tried to adjust my tps and could not get it to set any lower then 1.026, my understanding is that .997-.999 is the highest for n/a engines and 1.0 for the pwr adders. do u have any info on this.
well i fail to mention something in the first ?. my car was running well but when i arrived at the mech shop he told my timing was off b/c my #1 rotor must be at 12o'clock position, because the haynes manual has it that way, b/c that is for stock dist. i have a mallory and my #1 changed to the 9oclock position, car was great until he swap it to 12.
also have you ever had a beeping noise from behind the glove compartment. thanks again
Last edited by EagleAutosports; 05-11-2008 at 10:59 PM.
Reason: merged 2 posts
Your rotor button should point at the #1 post on the distributor cap, and it won't necessarily by at 12 o clock or not, it'll depend on your timing setting, whether it's advanced or not. If it ran better before he fiddled with it, put it back the way it was.
And the beeping sounds like the airbag control module, it's behind the radio.
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on my 89 5.0 I had the same problem of driving and the rpms drop and all the same stuff youve been having. If its still doing it, Replace the Ignition Moduel on the side of the Distrubtor becuase that was what was making mine die while driving and backfire and not want to start for awhile. just make sure to put the de-eletric grease on the backside of the new one cuz it is a VERY sensitive part.