Engine 1989 Mustang GT 5.0 HO Starting issues

tpearce89

Member
Aug 4, 2022
4
2
13
I've been having a hesitation issue with my 89 5.0. I replaced plugs, wires, cap, rotor and still had an issue. After driving it here and there, I pulled the plugs to see any fouling and found #5 was completely white. Replaced TFI and still misses. Went to replace the coil pickup and notices stress cracks in the bottom of the distributor shaft. Replaced the distributor and reinstalled as I pulled it out. It ran for about 30 seconds then died and wouldn't start here after. Decided to retime from TDC just incase I didn't install it perfectly, cranks and no start still. Pulled new distributor and reinstalled old distributor and same thing, cranks no start. Pulled plugs again and all seem wet with fuel. Cleaned and dried plugs and reinstalled all but 1 plug. Uninstalled plug installed on wire and grounded to test for spark, visual inspection shows there is spark. New distributor back installed and I've been doing various tests found on forums and I'm pulling hair out at this point. If anyone has some ideas, I'm willing to try them.

Thanks for any help!

Tyler
 
  • Sponsors (?)


General karthief

wonder how much it would cost to ship you a pair
Mod Dude
Aug 25, 2016
23,742
8,777
203
Read and follow directions.
 

manicmechanic007

5 Year Member
Sep 26, 2017
1,903
537
133
Every distributor shaft you will look at for a small block ford will have those cracks
They are from the manufacturing process
Sounds like you have no spark and the Coil, stator or TFI module might be at fault
You might also have the timing out of whack
Good luck
 

tpearce89

Member
Aug 4, 2022
4
2
13
Every distributor shaft you will look at for a small block ford will have those cracks
They are from the manufacturing process
Sounds like you have no spark and the Coil, stator or TFI module might be at fault
You might also have the timing out of whack
Good luck
Brand new coil, new stator that came in the new distributor, and tfi came new also. I did replace the tfi with a motorcraft a few months ago to try and fix the miss. It ran with the motorcraft. Timing is not out. Myself and another guy timed it.
 

tpearce89

Member
Aug 4, 2022
4
2
13
Read and follow directions.
Thanks, will have to work on these over the next couple days. Will post results after.
 
  • Agree
  • Like
Reactions: 1 users

tpearce89

Member
Aug 4, 2022
4
2
13
Thanks, will have to work on these over the next couple days. Will post results after.
Went through the check list and nothing was out of the ordinary. I decided to take a look at my timing in relation to valve position. I noticed when my intake valve was fully closed the piston was at the top of the stroke. Pulled the front of the engine apart this morning and found a sheared cam shaft pin and time to rebuild!
 
  • Surprised
Reactions: 1 user

manicmechanic007

5 Year Member
Sep 26, 2017
1,903
537
133
I do not like the length of those pins
Short by at least .200" in my opinion
I ground the head off a grade 8 bolt and used the shank to make a longer pin
I made a pin just as long as would fit in there
I had a pretty radical bumpstick in mine back then with triple springs and .580 or so lift (was too much) (for my big valves)
That puts tremendous strain on that pin
Good luck