Help needed with slow crank - Vintage Mustang Forums
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post #1 of 17 (permalink) Old 02-06-2019, 07:44 PM Thread Starter
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Help needed with slow crank

For some reason my car doesnt want to turn over. It struggles to turn, may and 1/8 of a turn at a time. Autozone testes the starter and say its good. Ive checked all the wires and grounds. When i connect it directly to the battery i get the same thing.

Is there a way to tell of the engine itself doesnt want to move. It sounds like the starter isnt strong enough to turn the engine
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post #2 of 17 (permalink) Old 02-06-2019, 07:56 PM
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I've had some cars with slow cranks before...

Have you tested the battery? Timing?

Allen
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post #3 of 17 (permalink) Old 02-06-2019, 07:59 PM
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Timing was my guess also.

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post #4 of 17 (permalink) Old 02-06-2019, 08:01 PM Thread Starter
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Yes battery is fine. I havent looked at timing because it wont start. It takes everything the starter has to move it a little bit. I think ive eliminated the starter and wiring. So now im thinking its mechanical.
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post #5 of 17 (permalink) Old 02-06-2019, 08:02 PM
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Mine used to turnover fine when cold but would barely turnover when warm. Turned out to be the battery in my case.

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post #6 of 17 (permalink) Old 02-06-2019, 08:02 PM Thread Starter
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If it was timing wouldnt it still turn the engine at the normal pace
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post #7 of 17 (permalink) Old 02-06-2019, 08:27 PM
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Quote:
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If it was timing wouldnt it still turn the engine at the normal pace
No.

if the timing is too advanced the starter is working against the ignited mixture too much. That's why many aftermarket ignition systems offer a 20 degree start retard feature that retards the timing 20 degrees until the rpm reaches 800 more or less.

turn your distributor an 1/8 of an inch counter-clockwise. That will retard the timing some and may let you start the engine.

Also, it would very cheap insurance to change ALL the cables from the battery to ground, to the solenoid, and from the solenoid to the starter. Even if they look fine at the ends, that doesn't guarantee that they aren't corroded inside somewhere. A set of new cables is not expensive and often will cure problematic starting and ignition issues.

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post #8 of 17 (permalink) Old 02-06-2019, 08:54 PM
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I agree with all the timing comments. I bought a brand new battery once... would have been a lot cheaper if I just tried retarding the spark a little.

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post #9 of 17 (permalink) Old 02-06-2019, 08:57 PM Thread Starter
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Ill give it a shot. Thanks. I dont understand why it would be fine, then all of w sudden doesnt want to start
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post #10 of 17 (permalink) Old 02-06-2019, 09:05 PM
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I dont understand why it would be fine, then all of w sudden doesnt want to start
Uhmmm, you left that out...

I would still check the timing but also see if the distributor is bolted down tight.

How old is the engine, could it have jumped time?

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post #11 of 17 (permalink) Old 02-06-2019, 09:22 PM Thread Starter
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The engine was from a '90 foxbody. I pulled it about 4 yrs ago and got it back up and running 2 months ago. It had been starting and running fine. It's up on stands right now.
Engine has oil pressure, coolant and never ran more than 2 or 3 minutes.

Then 1 day it seemed like the engine didn't want to move or the starter wasn't strong enuff to move it

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post #12 of 17 (permalink) Old 02-06-2019, 09:30 PM
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The engine was from a '90 foxbody. I pulled it about 4 yrs ago and got it back up and running 2 months ago. It had been starting and running fine. It's up on stands right now.
Engine has oil pressure, coolant and never ran more than 2 or 3 minutes.

Then 1 day it seemed like the engine didn't want to move or the starter wasn't strong enuff to move it
That just sounds like a battery. Wish I could help more but you'll get more responses...Good luck with solving!

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post #13 of 17 (permalink) Old 02-06-2019, 09:35 PM
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Ill give it a shot. Thanks. I dont understand why it would be fine, then all of w sudden doesnt want to start
Right before I "bought that battery" my car was running fine. Then I started having trouble starting it when the engine warmed up. Then it wouldn't start at all. I assumed it was the battery and I replaced it and nothing changed. I had the car originally timed to 12btdc. After some friendly advice (thanks guys) I cranked the dist just enough to get it started. Set it to 10. Haven't had a problem since.

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post #14 of 17 (permalink) Old 02-06-2019, 09:51 PM
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Just unplug the wire from coil to distributor and crank it. If it turns over faster, then timing is too advanced.
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post #15 of 17 (permalink) Old 02-06-2019, 10:04 PM Thread Starter
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Thanks
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