1991 mustang gt backfiring threw intake - Ford Mustang Forum

LinkBack Thread Tools
post #1 of 3 (permalink) Old 03-29-2011 Thread Starter
vjwoodrepo's Avatar
Joined: Mar 2011
Location: Hamburg
Posts: 1
1991 mustang gt backfiring threw intake

hey guys i have a 1991 mustang gt that has been having issues. when i start it up it doesnt want to stay running. It sounds like there is a major vaccum leak but theres not. and its sucking major air through the maf. when i try to keep it running that is when it pops. i have already replaced the tps and maf. could it be the o2 censors? thanks jake

vjwoodrepo is offline  
Sponsored Links
post #2 of 3 (permalink) Old 03-29-2011
PONY Member
4.6L Member
Subpath's Avatar
Joined: Apr 2010
Location: York
Posts: 613
Did this just happen as in instantly? If so I would check the timing and see if its still on, the chain could have jumped if the mileage is high. I ow on some carbed engines if the floats went out, they tended to dump too much fuel into the intake causing huge fire balls and popping noises to come out of the carb.

Subpath is offline  
post #3 of 3 (permalink) Old 03-29-2011
PONY Member
5.0L Member
My 5.0 91 LX's Avatar
Joined: Jan 2009
Location: Mcdonough
Posts: 382
usually if it backfires through the intake its fuel or air, if its through the exhaust its the timing. check your maf again, is it wet or dirty?do you have cai? and did you just clean and oil the air filter, could of gotten some oil on the wires in the maf

91 LX 5.0 HO , BBK SSI intake,MSD Pro Billet dist.,BBK adj.fpr, 75mm tb.73mm mas,BBK cai, Trick Flow underdrive pullies, 19lb injectors, 2 1/2" exhaust, BBK headers, x pipe, & converters, magnaflow cat back, Aod with TCI streetfighter valve body
My 5.0 91 LX is offline  
Sponsored Links

Quick Reply

Register Now

In order to be able to post messages on the Ford Mustang Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a VALID email address for yourself, otherwise you will not receive the necessary confirmation email needed to confirm, validate and activate your new AFM member account.

Failure to provide a VALID email address, will result in the cancellation of your new AFM member account registration.

Email Address:


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are On

For the best viewing experience please update your browser to Google Chrome