Starting Troubleshoot - Heatsoak?

[Jferrante]

Bought a new high torque starter and installed it tonight - that thing spins it quick. Still getting hesitation after letting run a little but it seems the extra oompf in the new starter is what it needs to crank over. I think its a voltage problem as the starter seems to be spinning fine.
I did a quick check on battery voltage. Brand new battery 2 months ago and reading 12 -12.1 volts after running (should be higher)...13.5ish while on (seems right). I may need to charge the battery since the car does sit for days on end but it seems that isn't helping.
Thanks for the help.

[T and S]

Go to MADelectrical.com and read about heat causing starting problems before you throw a lot of money at it. You might be able to fix it for just a few dollars and a little elbow grease.

[The Rocknrod]

Originally Posted by T and S

Go to MADelectrical.com and read about heat causing starting problems before you throw a lot of money at it. You might be able to fix it for just a few dollars and a little elbow grease.

From their web site:
http://madelectrical.com/catalog/st-1.shtml
"GM HOT START PROBLEMS
There are two independent categories of hot start problems with the GM DELCO built starting system.

(1) Nothing happens when the key is turned to "START"–although the headlights will burn brightly, and the rest of the electrical system is fine. The problem most often occurs in hot weather, and with the engine warmed up, after about a ten-minute stop. (Heat increases resistance at wiring and electrical parts.)

This is the type of problem, which will be cured with installation of the START'M UP kit. The problem occurs because the large solenoid on the GM starter draws 40 to 50 amps at the moment the key is turned to "START." And that large amount of current must flow through a very lengthy circuit, from the battery to the dash area. Through dash wiring and switches, back out through the under-hood wiring, finally to the starter.

The START'M UP kit will reduce current flow through the lengthy circuit to only 2 amps–then the system will work fine.
(2) SLOW CRANKING, a gr-r-runt, gr-r-runt. This kit won't fix it! You'll need to work with ignition timing, battery cables, the starter, and the rest of the system."

[T and S]

I plan on doing the starter relay in mine - I don't care what people think. If they don't like it - don't look at it

[franken]

Originally Posted by Jferrante

Bought a new high torque starter and installed it tonight - that thing spins it quick. Still getting hesitation after letting run a little but it seems the extra oompf in the new starter is what it needs to crank over. I think its a voltage problem as the starter seems to be spinning fine.
I did a quick check on battery voltage. Brand new battery 2 months ago and reading 12 -12.1 volts after running (should be higher)...13.5ish while on (seems right). I may need to charge the battery since the car does sit for days on end but it seems that isn't helping.
Thanks for the help.

You need to charge the battery disconnected on the - side from the truck for a few days, assuming a slow charge. That voltage reading is very low, and if the truck only sits for a few days is too low. After charging and running it, I'd disconnect the - battery cable each time after use and see if the trouble goes away.

If it does, you're looking at something discharging the battery when the vehicle isn't in use.

[Jferrante]

Originally Posted by franken

You need to charge the battery disconnected on the - side from the truck for a few days, assuming a slow charge. That voltage reading is very low, and if the truck only sits for a few days is too low. After charging and running it, I'd disconnect the - battery cable each time after use and see if the trouble goes away.

If it does, you're looking at something discharging the battery when the vehicle isn't in use.

Yup these were my next thoughts. New AAW wiring harness so I thought there might be a draw from something I didnt hook up.

[franken]

Originally Posted by Jferrante

Bought a new high torque starter and installed it tonight - that thing spins it quick. Still getting hesitation after letting run a little but it seems the extra oompf in the new starter is what it needs to crank over. I think its a voltage problem as the starter seems to be spinning fine.
I did a quick check on battery voltage. Brand new battery 2 months ago and reading 12 -12.1 volts after running (should be higher)...13.5ish while on (seems right). I may need to charge the battery since the car does sit for days on end but it seems that isn't helping.
Thanks for the help.

You need to charge the battery disconnected on the - side from the truck for a few days, assuming a slow charge. That voltage reading is very low, and if the truck only sits for a few days is too low. After charging and running it, I'd disconnect the - battery cable each time after use and see if the trouble goes away.

If it does, you're looking at something discharging the battery when the vehicle isn't in use.

[Jferrante]

Originally Posted by franken

If it does, you're looking at something discharging the battery when the vehicle isn't in use.

Definitely parasitic draw causing this - went home today to check and battery down to 4 volts ...

I realized I have the small battery wire running to a headlight relay mount that isnt being used. Think this is it....shall see tonight.