1991 GT just up and died while driving

JohnG

New Member
Mar 21, 2020
2
0
1
51
San Antonio, Texas
As the title says, it just died. I was at highway speed (maybe 60) and just lost all power. The gauges still worked, except the tach went to 0, even with the clutch engaged, and I know the engine was spinning since I had battery charge and power steering. And to test, I downshifted and released the clutch while coasting. The engine did not fire and the tach still showed 0. Because of this, I first suspect a crank position sensor or some sensor in the distributor. The car would not restart, even after sitting 30 minutes. The funny thing is that I coasted to a stop in a Ford dealership. The kind sales people helped me push it into a parking spot.
Now, it has been raining all day, and I did go through some puddles and splashed a lot. But nothing just prior to the failure.
Things I checked while I was there before my wife came to pick me up were: Rotor is turning while cranking, gauges seem to respond while in ON position and cranking, I 'think' I hear the fuel pump turning on with key on. Since the tach went 0 while on the road, I suspect some engine position sensor, or the ECM could just have died.

Any other thoughts as to what the culprit could be?

A little background. This is a 1-owner car, I bought it new. It has over a quarter million miles and is still a daily driver, as it always has been. No major mods outside of Flowmasters and K&N filter. The car has a manual transmission. I just filled up the tank 30 minutes before crap-out, but I had driven 10 miles or more, so the fuel is good. It has been hard to start, but I attribute that to fouled injectors, and injector cleaner is making a difference. This issue has been going on for a while, with backfiring occasionally, which is something new. ECM codes show some problem in the thermactor system, which I believe is unrelated to the assumed injector problem.
 
  • Sponsors(?)


General karthief

wonder how much it would cost to ship you a pair
Mod Dude
Aug 25, 2016
17,292
5,581
193
polk county florida
 
  • Like
Reactions: Monkeybutt2000

CrazyRedFox

Active Member
Dec 29, 2011
48
22
29
43
I had this happen to me twice in 2016. First time the gear at the bottom of the distributor got chewed up because it was made of cast iron instead of steal. Bought a new ford reman distributor with the correct gear and changed the oil. The second time my MDS coil went bad. Your problem is most likely in the ignition.
 

JohnG

New Member
Mar 21, 2020
2
0
1
51
San Antonio, Texas
Update. Got her running today. With the problems of the WuFlu, I had her parked in my company's warehouse. No one was there and she was safe and out of the weather. So, I bought a reman disty and new Motorcraft TFI. To test, I first checked to see 12v at the coil, and I had it. Then, I hooked the new assembled disty and TFI to the TFI plug. I disconnected the primary coil wire and set it to jump to ground with a short wire. Then, I turned the ignition to RUN and spun the disty gear by hand. Simulating a push-start condition. I saw sparks and heard the injectors working. I know the PIP was bad since I originally swapped the TFI with another. I then tried this with a spare disty I had laying around (of non-proven working condition) and it worked also. The used disty was in dirty shape and I probably would not have put it in mu car anyway.. But, this is an easy test for spark and such without cranking the engine. Tests can be done under the hood.

Now, where can i find a new PIP sensor? I want to put the original distributor back into the car to keep it original. I don't know if my TFI is good or not, but suspect it is. Just need a new PIP. I could use the one out of the reman distributor, but I believe it is a tested original one and old also. Looks old and used.
 

Blown88GT

Founding Member
Nov 13, 1999
2,070
480
134
Palm Beach Gardens, FL
...Now, where can i find a new PIP sensor? I want to put the original distributor back into the car to keep it original. I don't know if my TFI is good or not, but suspect it is. Just need a new PIP. I could use the one out of the reman distributor, but I believe it is a tested original one and old also. Looks old and used.
Any auto parts store.
PIP = Profile Ignition Pickup
Motorcraft Part #DU30C
Standard Motor Products Part #LX222
 
  • Like
Reactions: Monkeybutt2000
Thread starter Similar threads Forum Replies Date
Hudson N My 1991 keeps dying, help. Fox 5.0 Mustang Tech 12
Jughead 1991 5.0 GT battery always dying. 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 2
Q For Sale 1991 Hatch White/Blue Drag Spec, Near Full Build (Ohio) Fox Body Mustangs For Sale (1979-93) 0
M 65 headers (with a 1991 5.0) Classic Mustang Specific Tech 1
G 1991 mustang engine compartment restore 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 10
F Engine 1991 5.0 HO ignition problems. Fox 5.0 Mustang Tech 5
C Foxbody with no start issues Fox 5.0 Mustang Tech 5
R Paint and Body 1991 mustang ssp questions 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 18
3 Fuel pump not priming 1991 Gt mustang Fox 5.0 Mustang Tech 9
BAD91LX For Sale 1991 LX 5.0 hatch. $6,750 with 154700 miles Hurricane, Utah Fox Body Mustangs For Sale (1979-93) 0
R 1991 2.3 lx hatch The Welcome Wagon 2
S Electrical wiring diagram for neutral safety switch/backup lights on a 1991 5.0/aod Fox 5.0 Mustang Tech 1
A Suspension Question on Camber Kit for 1991 LX 5.0L Fox 5.0 Mustang Tech 2
LarsD SOLD 1991 LX hatch 5.0 (347/TKO) Elgin, Texas Fox Body Mustangs For Sale (1979-93) 2
T 1991 Mustang 2.3 Litre to 5.0 litre swap Fox 5.0 Mustang Tech 7
D Getting codes 998 and 122. 2.3L (N/A & Turbo) Tech 1
D Where is the Eec Relay? 2.3L (N/A & Turbo) Tech 7
D New to mustang world. Have a 91' lx 2.3l with problems. 2.3L (N/A & Turbo) Tech 8
MrPerfect2 Engine 1991 - What does a normal idle suppose to sound like on OEM 5.0 ? Fox 5.0 Mustang Tech 7
FastDriver SOLD 1991 5 spd 5.0 LX vert $5,000 Fox Body Mustangs For Sale (1979-93) 9
T Electrical Issues with 91 mustang with a 93 5.0 motor Fox 5.0 Mustang Tech 9
C 1991 Buc tag decoding 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 6
6 For Sale 1991 LX Convertible 5-speed for sale Fox Body Mustangs For Sale (1979-93) 1
I For Sale 1991 Gt Mini-tubbed street/strip roller Fox Body Mustangs For Sale (1979-93) 0
F 1991 LX Fuel sender swap question... 2.3L (N/A & Turbo) Tech 2
87_LX_5.0 New to me 1991 LX Convertible 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 3
P 1994 GT- 1991 TRW Pistons 1994 - 1995 Specific Tech 2
R Fuel 1991 5.0 Fuel Pump Noise Fox 5.0 Mustang Tech 0
X SOLD 1991 2.3 LX Coupe Fox Body Mustangs For Sale (1979-93) 0
L For Sale 1991-93 Ford Factory Pony 16 inch 4 lug rims/center caps and tires Wheels Tires Brakes 0
Fox904 Progress Thread 1991 Foxbody K Member Swap 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 38
Hudson N Anyone know what this does? 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 7
9 Drivetrain 1991 lx 5.0 aod trans issue Fox 5.0 Mustang Tech 1
I Engine 1991 Please Help -No Start No Click Starter Problems Fox 5.0 Mustang Tech 15
P 1991 lx 5.0 Fox 5.0 Mustang Tech 12
W SOLD 1991 LX 5.0, Westchester NY, 20k miles Fox Body Mustangs For Sale (1979-93) 3
P Engine 1991 Smog Pump Question Fox 5.0 Mustang Tech 6
USCGunner Fox 1991 5.0 LX price 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 19
paddyrk Digital Tuning 1991-exhaust crackles Fox 5.0 Mustang Tech 8
USCGunner Paint and Body 1991 Convertible window question Fox 5.0 Mustang Tech 6
B Electrical 1991 GT PCM Relay 4, 5 or six pins Fox 5.0 Mustang Tech 2
G Electrical 1991 LX Fox 5.0 Mustang Tech 0
T 1991 mustang builds The Welcome Wagon 1
S Electrical 1991 lx 2.3l convertible mustang 2.3L (N/A & Turbo) Tech 8
9 odd creaking noise Fox 5.0 Mustang Tech 3
C Engine 1991 mustang gt automatic Fox 5.0 Mustang Tech 21
Hudson N Fox Clicking/ticking sound coming from the front suspension 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 3
Hudson N Fox Alternator or smog pump is seized 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 7
Hudson N My a.c. tempature control knob wont turn 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 1
J 1991 mustang GT HELP Fox 5.0 Mustang Tech 5
Similar threads