Timing or fuel - 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 09-12-2011, 07:46 PM   #1
Registered Member
Regular
 
BigRed1781's Avatar
 
Join Date: Sep 2011
Region: Pennsylvania
Posts: 168
Timing or fuel

So here's the deal, my brother in law has a 87 gt. It started bogging out in the upper rpm's & when he would let off the throttle it would after fire (kind of like a backfire but through the exhaust) but only when hard on the throttle. If he eases into the throttle it would stil bog down in the higher range but no after fire. First we checked the plugs & wires, we discovered that the #1 & #4 plug wires were switched. We put them in the proper places & it ran better but stil did the same thing. We tried adjusting the dizzy & the problem got a little better but stil was there. Next we checked where the rotor was in relation to TDC on #1 cylinder and the cap. It was off just a hair. We pulled the dizzy & lined it up perfect with #1 on the cap & it wouldn't even start. So we put the dizzy back where it was, 1 tooth past the #1 on the cap & it runs just like it did before. With it being off we are running out of adjustment when turning the dizzy. We also changed the coil 3 times. The only thing I could think of is maybe the pickup in the dizzy is bad, or it's a fuel issue. The reason I say a fuel issue is because after it starts running funny it smells really rich. I'm thought I would turn to the pros on this. Any ideas would be greatly appreciated. Thank you
BigRed1781 is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 09-12-2011, 09:29 PM   #2
Road Trip!
 
Join Date: Apr 2011
Region: Indiana
Posts: 8,044
I'm not the pro.they are on there way I'm sure.just a thought,was the timing chain messed with? If someone had the cam timing off it could be made to run by adjusting the distributor.when some people mess up cam timing they try reversing plug wires.like I said,just a thought.
dreamstang is offline   Reply With Quote
Old 09-12-2011, 09:53 PM   #3
Registered Member
Regular
Supporter
 
93slowstang's Avatar
 
Join Date: Jan 2011
Location: Walker
Region: Louisiana
Posts: 3,436
Quote:
Originally Posted by BigRed1781
So here's the deal, my brother in law has a 87 gt. It started bogging out in the upper rpm's & when he would let off the throttle it would after fire (kind of like a backfire but through the exhaust) but only when hard on the throttle. If he eases into the throttle it would stil bog down in the higher range but no after fire. First we checked the plugs & wires, we discovered that the #1 & #4 plug wires were switched. We put them in the proper places & it ran better but stil did the same thing. We tried adjusting the dizzy & the problem got a little better but stil was there. Next we checked where the rotor was in relation to TDC on #1 cylinder and the cap. It was off just a hair. We pulled the dizzy & lined it up perfect with #1 on the cap & it wouldn't even start. So we put the dizzy back where it was, 1 tooth past the #1 on the cap & it runs just like it did before. With it being off we are running out of adjustment when turning the dizzy. We also changed the coil 3 times. The only thing I could think of is maybe the pickup in the dizzy is bad, or it's a fuel issue. The reason I say a fuel issue is because after it starts running funny it smells really rich. I'm thought I would turn to the pros on this. Any ideas would be greatly appreciated. Thank you
Ok, first I would get a timing light and set base timing at 10 degrees with the spout connector removed. The bogging and back firing could be due to fouled plugs, wires grounding out, or the fuel pressure regulator is possibly bad.

The fuel pump may also be having problems, I would find a fuel gauge and check pressure as well. It should be around 35psi at idle and 40+ at wot.
__________________


93 GT with more junkyard mods than you can imagine.
90 GT bone stock down to the air filter, awaiting restoration.
Join Mustang Evolution today. Click here
93slowstang 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


Similar Threads
Thread Thread Starter Forum Replies Last Post
fuel problem fordgirl1209 Pre-2005 V6 Mustang 10 08-25-2011 07:18 PM
Need help with timing cover bolts WhiteCobra94 1979-1995 Mustang GT 33 08-11-2011 03:23 PM
advancing timing 5.slow 1979-1995 Mustang GT 6 08-10-2011 11:40 AM
Fuel Filter replacement problem 99 SVT Cobra SVT Mustang 13 07-31-2011 08:25 AM
Serious fuel smell Mustanglife Pre-2005 V6 Mustang 9 07-25-2011 04:18 PM

» Like Us On Facebook



11:48 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.