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Car dies after about 30 minutes, won't start until cooled.

  • Thread starter Thread starter TCBigDog
  • Start date Start date Apr 24, 2022
  • Tags Tags
    dies won't start

TCBigDog

New Member
Aug 2, 2013
3
0
2
Colorado
Apr 24, 2022
#1
  • Apr 24, 2022
  • #1
I have a 1970 Mustang with a 347 running a Holley Sniper EFI.
Car runs great for about half an hour then dies. Doesn't sputter or run rough, just dies without warning. After that, when I try to restart, I get nothing. Engine doesn't turn over, I don't hear the solenoid clicking.
I have good voltage and I can hear the fuel pump running. After sitting for 20-30 minutes it will start right up like there was never a problem.
The EFI was installed last fall, this problem started this spring. Also have a new starter.
Any ideas what could be causing this issue?
 

TCBigDog

New Member
Aug 2, 2013
3
0
2
Colorado
Apr 24, 2022
#2
  • Apr 24, 2022
  • #2
I also have a new battery and a new ignition switch.
 

7991LXnSHO

wanna catch the space herp
10 Year Member
Sep 1, 2010
7,387
2,745
194
Kearney, NE
Apr 24, 2022
#3
  • Apr 24, 2022
  • #3
I read the title and expected vapor lock for this year of Mustang.
So brainstorming -
Second thoughts are the PIP and ignition module with a later 5.0. What distributor and ignition are you running with the Sniper. Those problems would still allow the engine to turn over.
Heat soak could explain the starter.
 

WORTH

20+ Year Stangneter
Nov 18, 2002
2,166
44
98
Cape Cod, Ma.
Apr 25, 2022
#4
  • Apr 25, 2022
  • #4
Sorry, I stop at 1979.
 

2Blue2

will be trying this sex one when I can find it
Mod Dude
Mar 5, 2019
4,436
2,903
163
Oahu
Apr 28, 2022
#5
  • Apr 28, 2022
  • #5
hot oil film killing starter grounding?
Just guessing,need more info
 

TCBigDog

New Member
Aug 2, 2013
3
0
2
Colorado
Apr 30, 2022
#6
  • Apr 30, 2022
  • #6
2Blue2 said:
hot oil film killing starter grounding?
Just guessing,need more info
Click to expand...
Thanks for responding. I was thinking it might be a ground issue somewhere, would the starter ground cause the engine to die? I'll take a look at it tonight.
 

2Blue2

will be trying this sex one when I can find it
Mod Dude
Mar 5, 2019
4,436
2,903
163
Oahu
Apr 30, 2022
#7
  • Apr 30, 2022
  • #7
TCBigDog said:
would the starter ground cause the engine to die?
Click to expand...
The starter probably grounds thru the engine ground strap, you checked the engine ground strap right?
 

CAMTWO1070

Active Member
Dec 17, 2021
244
82
38
NY
May 6, 2022
#8
  • May 6, 2022
  • #8
Do you have the Sniper setup controlling the timing or non-control...?

What distributor are you using?
 
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