1991 GT bucking problem - Mustang Evolution

Go Back   Mustang Evolution > 1979-2015 Mustang GT || Tech and Talk > 1979-1995 Mustang GT



Reply
 
Thread Tools Search this Thread
Please support our sponsors and let them know you heard about them here!
Old 10-27-2013, 10:56 PM   #1
Registered User
Newbie
 
PhilDladu's Avatar
 
Join Date: Sep 2013
Location: Boucherville
Region: Canada
Posts: 18
I have a 5.0 1991 lx mustang and have a big bucking problem. It is bucking over 2500-3000 rpm and I'm loosing a lot of power. Even at 1500-2000 rpm, if I pull the gaz little too much, it is bucking as hell. I don't know what to do ! I changed my fuel filter, my coil pack is fine (no sparks when I throw water on it) and my engine seems to be grounded on the body. My idle is also little too high even when the engines hot (1200-1300rpm). My car has been made in usa. It's a manual transmission. Any ideas? Sorry for my bad english.
PhilDladu is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 10-27-2013, 11:22 PM   #2
Registered Member
Regular
 
Fiveohfox's Avatar
 
Join Date: Oct 2012
Region: California
Posts: 149
Spark plugs/wires, MAF?
Fiveohfox is offline   Reply With Quote
Old 10-27-2013, 11:30 PM   #3
Registered User
Newbie
 
PhilDladu's Avatar
 
Join Date: Sep 2013
Location: Boucherville
Region: Canada
Posts: 18
New sparkplugs (stock ones), msd distributor (streetfire) and wires recently changed but the car was doing it before these changes. MAF is stock... I think.
PhilDladu is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 10-28-2013, 01:14 AM   #4
Registered Member
Regular
 
Fiveohfox's Avatar
 
Join Date: Oct 2012
Region: California
Posts: 149
That's weird idk then cause when mine was doing it, I changed the fuel filter, plugs and wires and it went away.
Fiveohfox is offline   Reply With Quote
Old 10-28-2013, 06:49 AM   #5
Registered Member
Regular
 
mystang50's Avatar
 
Join Date: Jul 2011
Location: houston
Region: Texas
Posts: 1,201
could possibly be harmonic balancer
__________________
1995 5.0 u/d,cai,t/b,shorty headers,x pipe,flows 40's,373 gears, alum. driveshaft, alum. radiator, shift kit, e-cam, ported upper and lower intake, 100 shot of spray, 2100 stall, black 0304 cobras. suspension: upper and lower control arms, sub frame connecters, and springs all SVE
mystang50 is offline   Reply With Quote
Old 10-28-2013, 09:26 AM   #6
Registered User
Newbie
 
PhilDladu's Avatar
 
Join Date: Sep 2013
Location: Boucherville
Region: Canada
Posts: 18
Oh and I forgot to say that the problem is less important when the engine is cold... It is still missing power but it is less bucking... And I think it's doing backfires sometimes but i'm not really sure and it's not happening very often.
PhilDladu is offline   Reply With Quote
Old 10-28-2013, 01:34 PM   #7
Registered Member
Regular
 
Jlp06's Avatar
 
Join Date: Oct 2013
Location: Farmington
Region: Utah
Posts: 134
Clean your MAF sensor with some CRC cleaner at your local autozone. Next I would check your CATs for back pressure and also check your EGR valve for carbon buildup. Has your thermostat ever gone out?

---------- Post added at 12:34 PM ---------- Previous post was at 12:32 PM ----------

Also, how's your air filter? May need to change that
Jlp06 is offline   Reply With Quote
Old 10-29-2013, 10:54 AM   #8
Registered User
Newbie
 
PhilDladu's Avatar
 
Join Date: Sep 2013
Location: Boucherville
Region: Canada
Posts: 18
I dont know, I recently bought this car. Is it possible it's my fuel pump ? Or that it's related with the fuel pressure ?
PhilDladu is offline   Reply With Quote
Old 10-29-2013, 11:50 AM   #9
Registered Member
Regular
 
Jlp06's Avatar
 
Join Date: Oct 2013
Location: Farmington
Region: Utah
Posts: 134
Well, turn your key on but not enough to start it. You should hear the fuel pump kick on.
Jlp06 is offline   Reply With Quote
Old 10-29-2013, 11:55 AM   #10
Registered User
Newbie
 
PhilDladu's Avatar
 
Join Date: Sep 2013
Location: Boucherville
Region: Canada
Posts: 18
If it does, my problem is the fuel pump?
PhilDladu is offline   Reply With Quote
Old 10-29-2013, 12:50 PM   #11
Registered Member
Regular
 
Liebert91stang's Avatar
 
Join Date: Jun 2013
Location: New Albany
Region: Indiana
Posts: 375
The fuel pump should kick on when the key is turned.you want to hear that.doesnt sound like it fuel related to me
Liebert91stang is offline   Reply With Quote
Old 10-29-2013, 01:00 PM   #12
Registered Member
Regular
 
Durnstang's Avatar
 
Join Date: Jan 2012
Region: Canada
Posts: 106
Can you rev the car while parked? And it feels fine?
You have to check for spark New plugs or not
Change your fuel filter and check your timing once you know those are good move on to sensors
Spark, timing, fuel
Durnstang is offline   Reply With Quote
Old 10-29-2013, 01:16 PM   #13
Registered User
Newbie
 
PhilDladu's Avatar
 
Join Date: Sep 2013
Location: Boucherville
Region: Canada
Posts: 18
No he's not better when parked... My timing is good, spark plugs and fuel filter are new...
PhilDladu is offline   Reply With Quote
Old 10-29-2013, 01:42 PM   #14
Registered Member
Regular
 
Durnstang's Avatar
 
Join Date: Jan 2012
Region: Canada
Posts: 106
Sorry I should have read your post better
Did the high idle start the same time the power loss started
Durnstang is offline   Reply With Quote
Old 10-29-2013, 01:51 PM   #15
Registered Member
Regular
 
Durnstang's Avatar
 
Join Date: Jan 2012
Region: Canada
Posts: 106
Also check the maf just unplug it whilethe car is off then start if the car runs at all better it points to a failed maf
Durnstang is offline   Reply With Quote
Old 10-29-2013, 01:57 PM   #16
Registered Member
Regular
 
2300turboford's Avatar
 
Join Date: Nov 2011
Location: london
Region: Kentucky
Posts: 2,903
Does the car have a cam ? And is it a 5 speed ?
__________________
"Racing is life ,anything before or after is just waiting "-the king of cool -Steve McQueen
2300turboford is offline   Reply With Quote
Old 10-29-2013, 02:13 PM   #17
Registered Member
Regular
 
Durnstang's Avatar
 
Join Date: Jan 2012
Region: Canada
Posts: 106
Quote:
Originally Posted by 2300turboford View Post
Does the car have a cam ? And is it a 5 speed ?
haha are you going where I think you are
Durnstang is offline   Reply With Quote
Old 10-29-2013, 02:16 PM   #18
Registered User
Newbie
 
PhilDladu's Avatar
 
Join Date: Sep 2013
Location: Boucherville
Region: Canada
Posts: 18
No he's stock and yeah its a 5 speed. And i don't really know if the problem started at the same time but i know that even if i changed the timing, the idle didnt drop..
PhilDladu is offline   Reply With Quote
Old 10-29-2013, 02:27 PM   #19
Registered Member
Regular
 
Durnstang's Avatar
 
Join Date: Jan 2012
Region: Canada
Posts: 106
Do the simple maf test unplug while off then start it'll run better if maf has failed
Durnstang is offline   Reply With Quote
Old 10-29-2013, 04:36 PM   #20
Registered Member
Regular
 
mustangmania91's Avatar
 
Join Date: Dec 2012
Location: mayslick
Region: Kentucky
Posts: 143
I own a 91 GT also. Sounds like the same problem I had with mine. I changed the TFI ignition module on your distributor and never had it happen again
mustangmania91 is offline   Reply With Quote
Old 10-30-2013, 08:54 AM   #21
Registered User
Newbie
 
PhilDladu's Avatar
 
Join Date: Sep 2013
Location: Boucherville
Region: Canada
Posts: 18
I heard this in a lot of forums, I will try this out! Thank you guys, I will bring you news soon!
PhilDladu is offline   Reply With Quote
Old 10-30-2013, 09:32 PM   #22
Registered User
Newbie
 
PhilDladu's Avatar
 
Join Date: Sep 2013
Location: Boucherville
Region: Canada
Posts: 18
Thanks to all of you guys, i cleaned my maf sensor and it's a new car !!
PhilDladu is offline   Reply With Quote
Reply

Lower Navigation
Go Back   Mustang Evolution > 1979-2015 Mustang GT || Tech and Talk > 1979-1995 Mustang GT

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not 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 On
Refbacks are Off


» Like Us On Facebook



08:15 AM


Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO 3.6.0

MustangEvolution.com is in no way associated with or endorsed by Ford Motor Company.