Engine 1992 5.0 Died while running, crank no start, Tach Jumping

[ty50650]

Wondering if someone can help.

My 1992 5.0 5 speed died while on a drive home the other night. It cranks but wont start.

Couple things to note-
(not the battery)
- OBD1 is showing code 95, 11, 10.
- There is fuel at the valve that sprays out when pressed.
- Tried checking for spark, didn't get any spark. ( I might need to re-check just incase I wasn't checking correctly)
- When I started the car to start driving home, I noticed the RPM gauge bouncing up and down and acting a little erratic. RPM's sounded completely normal, just tach was off.
This never happened before until about 20 minutes before the car died completely on the freeway.
- also wont start when holding throttle open.

I noticed the TFI Module harness was barely plugged in, and so i snapped it in and tried to start again, with no luck.
I checked the fuel pump relay by connecting a power source and listening to it click.
Fuel pump primes like normal for about 2 seconds when KOEO.

My other fox went through the same issue- crank no start. It was a failed ECU. Wondering if this could be the same thing? The only thing - my fuel pump ran continuously when the ECU failed. This one primes like normal and shuts off.

Any help would be appreciated - still learning how to work on my own cars, so cut me some slack.

 

[AeroCoupe]

Work through the checklist methodically and you will find the problem.

Cranks OK, but No Start Checklist for Fuel Injected Mustangs

Cranks OK, but No Start Checklist for Fuel Injected 5.0 Mustangs model years 1986-1995 A word about this checklist before you start: it is arranged in a specific order to put the most likely failure items first. That will save you time, energy and money. Start at the top of the list and work...

stangnet.com

 

[Mindseye007]

Wondering if someone can help.

My 1992 5.0 5 speed died while on a drive home the other night. It cranks but wont start.

Couple things to note-
(not the battery)
- OBD1 is showing code 95, 11, 10.
- There is fuel at the valve that sprays out when pressed.
- Tried checking for spark, didn't get any spark. ( I might need to re-check just incase I wasn't checking correctly)
- When I started the car to start driving home, I noticed the RPM gauge bouncing up and down and acting a little erratic. RPM's sounded completely normal, just tach was off.
This never happened before until about 20 minutes before the car died completely on the freeway.
- also wont start when holding throttle open.

I noticed the TFI Module harness was barely plugged in, and so i snapped it in and tried to start again, with no luck.
I checked the fuel pump relay by connecting a power source and listening to it click.
Fuel pump primes like normal for about 2 seconds when KOEO.

My other fox went through the same issue- crank no start. It was a failed ECU. Wondering if this could be the same thing? The only thing - my fuel pump ran continuously when the ECU failed. This one primes like normal and shuts off.

Any help would be appreciated - still learning how to work on my own cars, so cut me some slack.

TFI Module 100% cooked , get a new one from Rockauto Motorcraft https://www.rockauto.com/en/moreinfo.php?pk=5434788&cc=1134010&pt=7172&jsn=17 or STANDARD MOTOR PRODUCTS LX223 https://www.rockauto.com/en/moreinfo.php?pk=49708&cc=1134010&pt=7172&jsn=932
and check your current TFI Module, by buying this off Ebay https://www.ebay.ca/itm/25553718100...pid=5335821607&customid=&toolid=10001&mkevt=1
and don't for get to buy a 9 Volt Battery. and you can relocate your new TFI module with this https://www.mccullyracingmotors.com/ best one out there. and get some extra Arctic Silver 5 thermal paste https://www.ebay.ca/itm/16642480345...pid=5335821607&customid=&toolid=10001&mkevt=1
and after its all installed your Tach will work perfect again and your stang will fire right up.
also if you ever need your ECU repaired this place is awesome and the best place to get it fixed at.

1986-2004 Ford Mustang A9L A9P ECU Repair Service

1986-2004 Ford Mustang A9L A9P ECU Repair Service Engine Computer Repair Please fill out the R&R form here once you've placed your order.Easy repair process1. Purchase repair service (this way helps us keep track of what's coming in for repair)2. Include order number with your computer and mail...

www.theecuexchange.com