back fire

pedley · 07-06-2003, 10:33 PM

i got an 88 gt that keeps back fireing in the intake when its underload or when i dont give enough gas in firts gear, and if i let it lug in any gear then step on it.
any ideas anyone
could there be bad codes in it or what???

bottlebaby91 · 07-06-2003, 11:28 PM

Check your timing.

Old Guy with 87 GT · 07-07-2003, 04:05 AM

my car is doing the exact same thing ........in my case i'm pretty sure its from bent or sticking valves

.....the backfiring/missing started from a higher rpm and started to progress torward the lower rpm range the more i drove it .........it misses at idle and carrys on missing/backfiring the more i put the engine under load....i'm pretty sure with mine its bent valves becouse one the heads thats on mine isn't properly set up for my combo (missmatched valve springs ..long story).......after reading the symptoms you described i'd look into it ....mine does allmost the same thing you described

Jeff Cardwell · 07-07-2003, 07:34 AM

Hello,
I have a 93 5.0 5-speed convertible that was doing almost the same thing. It would bakc fire then run better come to find out that the fuel injection harness grounds to the back of the drivers side head was loose and arching. It was not making a good ground for the MAF either. The ground attaches to the drivers side head just to the inside and under the crossover tube for the emmisions. Hope this helps.

Jeff Cardwell
Thunder Valley Mustang Club

pedley · 07-07-2003, 09:29 AM

mine doesn't miss or anything its just back fires and not all the time just once and awhile
my timming is set at 14 degrees is that may be to high if so what would be good

i have that ground on my upper intake so is it hard to get at from the top ?
it goes just under the crossover tube or above it?
does it get put with the ground that goes to the fire wall?

07-06-2003, 10:33 PM	#1
pedley Registered Member Join Date: Jul 2003 Location: canada Posts: 74	back fire i got an 88 gt that keeps back fireing in the intake when its underload or when i dont give enough gas in firts gear, and if i let it lug in any gear then step on it. any ideas anyone could there be bad codes in it or what???

07-07-2003, 04:05 AM	#3
Old Guy with 87 GT Registered Member Join Date: May 2001 Location: Harrisburg, Pennsylvania Posts: 379	my car is doing the exact same thing ........in my case i'm pretty sure its from bent or sticking valves .....the backfiring/missing started from a higher rpm and started to progress torward the lower rpm range the more i drove it .........it misses at idle and carrys on missing/backfiring the more i put the engine under load....i'm pretty sure with mine its bent valves becouse one the heads thats on mine isn't properly set up for my combo (missmatched valve springs ..long story).......after reading the symptoms you described i'd look into it ....mine does allmost the same thing you described __________________ the "not so old",old guy 87 Mustang GT T-top >hanlon t-5, pro 5.0, centerforce clutch ,adj. cable/quatrant ,3.27s ,full 2 1/2 ex(off road H) adj. reg. ,e-cam ,70mm TB, cobra intake ,1.7rr ,ported/milled e7ets w/crane springs ,306 balaced/decked short block w/speed pro forged flat top pistons ...257rwhp/302rwt best et 13.7@102 (4/11 ) '80 Capri (future project,currently collecting parts for 351 moter)

07-07-2003, 07:34 AM	#4
Jeff Cardwell Registered Member Join Date: Feb 2003 Location: Harrsion, TN Posts: 7	Hello, I have a 93 5.0 5-speed convertible that was doing almost the same thing. It would bakc fire then run better come to find out that the fuel injection harness grounds to the back of the drivers side head was loose and arching. It was not making a good ground for the MAF either. The ground attaches to the drivers side head just to the inside and under the crossover tube for the emmisions. Hope this helps. Jeff Cardwell Thunder Valley Mustang Club __________________ 91 Coupe AOD 3.73 15/8 Shortys 75mm maf Explorer Intake 70mm Throttle Body Best E.T. in 1/8 = 8.94

07-07-2003, 09:29 AM	#5
pedley Registered Member Join Date: Jul 2003 Location: canada Posts: 74	back fire mine doesn't miss or anything its just back fires and not all the time just once and awhile my timming is set at 14 degrees is that may be to high if so what would be good i have that ground on my upper intake so is it hard to get at from the top ? it goes just under the crossover tube or above it? does it get put with the ground that goes to the fire wall? Last edited by pedley; 07-07-2003 at 03:15 PM..

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07-06-2003, 11:28 PM	#2
bottlebaby91 Registered Member Join Date: Nov 2002 Posts: 141	Check your timing.