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backfiring

  1. 8-year project build -- Backfiring through intake, not idling.

    5.0L Tech
    Hi there. I have a 1988 Ford Mustang LX fox that has a 5.0 converted from speed density to mass air. This has been a long project for my dad and I, and recently we initially got it started for the very first time at zero degrees timing. It idled pretty well without stumbling around 1k, but...
  2. Backfiring thru carb, won't idle

    Classic Tech
    Hi all, 66 coupe, 289 bored .030 over, mild Edelbrock cam with Edelbrock lifters, intake and 500 cfm carb. Has probably 2k miles on the rebuild if that. The car sat for the better part of a year in my garage while I did work to it, installing an electric fuel pump, subframe connectors, disc...
  3. 1989 mustang lx running rich. help needed.

    5.0L Tech
    Hey guys I just recently did a nice little motor build but I'm having some problems ironing out the little details. lets start with the build went from stock 302 to .20 over bore, edelbrock performer rpm heads, ported and polished pro comp intake, trick flow cam: intake lift .542". intake...
  4. 1982 2.3L backfiring problems

    2.3L Talk
    So I have this Mustang and I've had it a few years and not long after I purchased it, i noticed that it backfired. Most of the backfiring occurs when you shift or any other time that you instantly get off of the gas pedal. There are a few things we think it could be: The timing, the mixture, or...
  5. Problems after changing spark plugs?

    5.0L Tech
    I got new plugs for my 1985 mustang 5.0 and changed them out. now that i have the car makes a popping sound kinda when i go to accelerate and backfires like crazy when i half throttle or more. when it starts making the popping noise it starts to lag. its not a constant lag only when it makes the...
  6. 5.0 backfiring and running rich

    5.0L Tech
    1990 Mustang 5.0 H.O-- Problem- Running very rich, backfiring through intake and exhaust when driven **Car Idles ok and firing order is correct. I had the fuel presure regulator not hooked up to vacuum and it ran but popped. Just found that problem today and got it hooked up to vacuum but still...
  7. 2000 mustang backfiring

    4.6L Tech
    I have a 2000 v6 mustang. all was good until i replaced the plugs and wires and now It is backfiring. I tested it by pulling each wire to see which one does not effect the idle and narrowed it down to one. I have tested to ensure I am getting spark at the plug and I do.I even replaced the plug...
  8. 1966 coupe with a 1968 302 with rough idle and backfiring. Please help!

    Classic Tech
    First post on this forum, I really need some help. Please! I have a 1966 with a 1968 302, the car starts and runs perfectly and idles great initially, has good power until I drive it for about 35-40 minutes, or roughly for 15 miles (dont ask why, but always at that point, that's my usual...
  9. Cannot start after rebuilt, backfiring 1970 Mustang 302

    Classic Tech
    I just finished rebuilding a 1970 302 and have been trying to get it start up. When i just crank on it and adjust the timing it doesnt do anything except turn, when i pull the trottle to give it gas it keeps backfiring through the carb, it isnt the really loud explosive soundimng backfiring, it...
  10. 2003 Mustang gt Miss Firing when under load

    4.6L Tech
    I recently pulled out my 2003 mustang gt for the summer. Since i pulled it out it has been missing and backfiring when under load. If i idle around town you can hear the miss still. but still idles half decent. Engine was just rebuilt begining of summer last year. Intake and throttle body has...
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