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ok i searched first so dont flame me but it seems like there are two different kinds of popping being addressed, a misfire and a backfire.
my issue has gotten progressively worse over the course of the week. when i first start the car it idles ok and i can rev it no problems. however once under load it will pop a little and hesitate. these pops sound like theyre coming from the exhaust NOT the engine so this would be a backfire correct? usually after a couple of them it would go away and be a non issue either once the car warmed up or i was at a steady pace and then warmed up. however, tonight on my way home from school just a short trip it was popping and chugging badly and i could hardly get my speed up id let off down shift try and work my way up again and it was a nightmare. i guess tomorrow ill see how it went but i was wondering what would be causing this and how to fix it. its a 1990 5.0 lx. i was hoping to do a rebuild over the winter but that will rest upon if my parents will let me buy a winter beater. thanks for the help in advance.
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how long's it been since it had a tune up,timing could also be off check to make sure the distributor is tight
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91 mustang 5.0 lx,306 shortblock,E-303 cam,ported and polished E7's,rebuilt stock T-5,bbk E/L shorty headers,with their 2 1/2" o/r H-pipes,70 mm maf,3G alt.,upr adj. upper c/a's 3:73 gears. race weight with driver:3260,only a 100 lbs. more than the 85
85 mustang: parts car for now
Best time 13.7@ 102 mph 2.074 60' on street tires(in the '85)
Best time 14.3@ 96 mph 2.13 60' on street tires(in the '91)
ive owned the car for about 3 months and have been so occupied with the other small things i havent done a full tune up yet. but i now i need to anyway so that will be in order and i will check the distributor any other suggestions? other than wanting to know just how to fix it i would like to know WHAT'S actually happening while this is going on and why? anyone know? thanks
Wondering if you were able to locate the problem? I'm having same issues...hesitation and a corresponding popping noise. I've change and checked several things with no luck.
Try plugs first for sure. Make sure you gap the new ones correctly too.
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If you want it cheap and fast it won't be good.
If you want it cheap and good, it won't be fast.
If you want it good and fast, it won't be cheap!
I bumped my timing to 14 and that seemed to do the trick. A full tune up is still in order but so far this has cured the 'morning sickness' popping. Good luck to the other guy with similar problems
You may need to run 91 octane to prevent detonation at 14 advance. I think stock was 8 w/o the vacuum advance connected. Refresh my memory, is the 90 a vacuum or electrical advance? Either way, your problem could lie there.
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popping noise, hesitation, maybe backfiring?
