teej

Hi - 67 fastback with a new alternator, MSD ignition, relatively new battery.

When cold - starts no problem.

Drive for 20 minutes, park, then try to start and the engine barely turns over, won't spark to start. If I wait a few minutes it will turn over a few more times but still no spark. 13V at the battery when in this situation. If I boost the battery, even with a portable 1500 AMP battery booster, it will start.

Ideas?

Starter or solenoid heat soak?

Bad ground? (coil, ignition, ? )

thanks.

Gun Jam

when did it last work right?

-Gun

teej

Its been a while. Had issues with the power, had a lag on throttle so moved up to msd ignition. Sometime after that, not right away, started having the issue.

I run a single wire alternator. The voltage was low so just swapped it with new. That didn't fix the situation so I know its not the charging system. Has to be either starter or the battery or a ground issue, my guess. I could be wrong though, thats why I thought I would ask here.

Gun Jam

what starter are you using? is it a mini starter for a t5 trans or is it the big original one?

also put a volt meter on the battery and crank it over when hot have someone watch and see what the voltage sag looks like when the starter is attempting to engage.

What is your current timing set to initial?

-Gun

teej

the voltage sags to 8V when it tries to start. I swapped the starter solenoid with a spare to make sure it wasn't the culprit - same issue. So I am guessing starter - ?

racer_dave

sounds like starter to me. It's pulling too many amps.

Gun Jam

sounds like a bad battery to me.

I suggest having the battery tested first then if it test good perhaps look into a cause for high starter resistance.

-Gun

creaky

+1..........when the battery voltage drops below 9.5 volts during starting, the battery is going south.

MonsterBilly

FYI i had a similar issue with a spanking new starter. THen I replaced it, Same issue. returned that one and have been good since.

69mach1377

I've got a similar issue, but I think the starter is getting too hot from the header.