1990 Mustang LX runs bad/stalls
02-09-2015, 01:37 PM
#12
3rd Gear Member
Join Date: Sep 2011
Location: Florida
Posts: 632
It may help you to grab a friend's fox and try swapping a few parts to test things out in the future. I am not saying that one particular part is the culprit such as the TFI module, I'm just saying it's cheaper and that way you know the parts you're putting on are working. I will tell you what JUST happened to me, I bought a new/used MSD distributor for my fox. It looked great, brand new in fact. I swapped it at my buddies house in 5 minutes, put on a new MSD TFI, and timed it at TDC. It worked great for about 30 seconds then at idle it would drop to 500 rpms after about 30 seconds after starting and get worse and worse as you drove the car. With my old distributor, it worked perfect. So I put another TFI on it and made it look like a birthday cake with heat sink. It drove great for about 5 miles then bam, it started acting up again. I put the old distributor on it and it's been fine ever since.
To me, it sounds like an electrical issue (a ground or something). Check all the grounds and look at a few wiring diagrams to make sure you don't have a wire crossed or something stupid like that. You seem like you have taken all of the proper steps so far, so it has to be something dumb.
To me, it sounds like an electrical issue (a ground or something). Check all the grounds and look at a few wiring diagrams to make sure you don't have a wire crossed or something stupid like that. You seem like you have taken all of the proper steps so far, so it has to be something dumb.
02-09-2015, 06:38 PM
#13
Thread Starter
Join Date: May 2013
Location: TEXAS
Posts: 49
Another update. Today, recharged the battery and had my son turn it over for me. Nothing. Pulled the coil wire off the coil and held it about an inch or two from the coil pin on the distributer and had my son turn it over. No spark coming from coil. Narrowed it down to a firing problem, and possibly gas too if the computer is not sending out signals. Sounds like the computer is asleep. Any suggestions????
02-10-2015, 01:48 PM
#16
6th Gear Member
Join Date: Mar 2010
Location: Wisconsin
Posts: 5,061
02-10-2015, 02:54 PM
#18
Thread Starter
Join Date: May 2013
Location: TEXAS
Posts: 49
Pulled out the meter and check the voltage. Here are the numbers...coil connector red wire 15 volts. Yellow connector wire is 2.4 volts. Plugged connector back to coil and tested coil plug is 14 volts. Plugged wire back to coil and tested, 14.5 at the end of the wire. Any suggestions???
