Hard starting when Hot.
Thread Starter
Le Mans Master
Joined: Jun 2011
Posts: 8,049
Likes: 330
From: Charlotte NC
St. Jude Donor '14-'15
Hard starting when Hot.
I have a 2008 corvette Z51 that almost won't crank after running for a while. some facts.....
I have a ZR1 exhaust on so it is difficult to replace the starter, must remove exhaust.
Off the battery reads 13.2 volts
running the battery reads 14.5 - 14.7 volts
connection + at the fuse box reads 14.5 volts
inside the DIC reads 14.2 volts
I replaced the solenoid last year and it is in good physical condition. I wrapped it when I installed it, terminals are Good.
It starts fine after it sits for a while, maybe an hour.
Turn the headlights on and start the car and the lights are good no dimming at all.
I switched around the fuses in the fuse box all that have anything to do with the battery (yes with same amp fuses).
has an AGM battery maybe a year old.
Any ideas on what to check next?
The relays in the fuse box are installed in different orientations, does this matter?
I have a ZR1 exhaust on so it is difficult to replace the starter, must remove exhaust.
Off the battery reads 13.2 volts
running the battery reads 14.5 - 14.7 volts
connection + at the fuse box reads 14.5 volts
inside the DIC reads 14.2 volts
I replaced the solenoid last year and it is in good physical condition. I wrapped it when I installed it, terminals are Good.
It starts fine after it sits for a while, maybe an hour.
Turn the headlights on and start the car and the lights are good no dimming at all.
I switched around the fuses in the fuse box all that have anything to do with the battery (yes with same amp fuses).
has an AGM battery maybe a year old.
Any ideas on what to check next?
The relays in the fuse box are installed in different orientations, does this matter?
Melting Slicks
Joined: Dec 2013
Posts: 2,232
Likes: 315
From: Bridgewater New Jersey
Best to have the starter checked for amperage draw when you are experiencing the hot start issue. Part stores can check it will you attempting to start the car, should be able to do the test for free.
While your there, have them also load test the battery.
While your there, have them also load test the battery.
Thread Starter
Le Mans Master
Joined: Jun 2011
Posts: 8,049
Likes: 330
From: Charlotte NC
St. Jude Donor '14-'15
Burning Brakes
Joined: Aug 2014
Posts: 1,240
Likes: 258
From: Tampa FL
Starter heat soak would me my though.
http://www.jegs.com/p/Hooker-Headers...36590/10002/-1
http://www.jegs.com/webapp/wcs/store...rsistYmm=false
http://www.jegs.com/p/Hooker-Headers...36590/10002/-1
http://www.jegs.com/webapp/wcs/store...rsistYmm=false
Burning Brakes
Joined: Jul 2008
Posts: 923
Likes: 37
From: Green Bay Wisconsin
Starter heat soak would me my though.
http://www.jegs.com/p/Hooker-Headers...36590/10002/-1
http://www.jegs.com/webapp/wcs/store...rsistYmm=false
http://www.jegs.com/p/Hooker-Headers...36590/10002/-1
http://www.jegs.com/webapp/wcs/store...rsistYmm=false
Wrap the exhaust where it passes the starter.
Douglas in Green Bay
Thread Starter
Le Mans Master
Joined: Jun 2011
Posts: 8,049
Likes: 330
From: Charlotte NC
St. Jude Donor '14-'15
Starter heat soak would me my though.
http://www.jegs.com/p/Hooker-Headers...36590/10002/-1
http://www.jegs.com/webapp/wcs/store...rsistYmm=false
http://www.jegs.com/p/Hooker-Headers...36590/10002/-1
http://www.jegs.com/webapp/wcs/store...rsistYmm=false
Thanx for your replies, I'm heading to Advance to let them test the starter and battery.
Thread Starter
Le Mans Master
Joined: Jun 2011
Posts: 8,049
Likes: 330
From: Charlotte NC
St. Jude Donor '14-'15
Well my 2 year old Duracell AGM with a Free 3 year replacement is bad.
It's a 660 CCA that clocks at 280 at 12.88 Volts. Back to Sam's Club for a Freebie
. I'm glad it was that because I really didn't want to climb back under that car to replace the starter. 
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Race Director
Joined: Dec 2013
Posts: 12,505
Likes: 3,634
Double check to make sure your battery tender is rated for AGM batteries!!!!
Also to point out, since the OEM alternator is not the best to keep the battery topped off when the car is running (sitting at a stop light with the A/c running is going to drain down the battery since the oem alternator is only putting out about 14 amps then, while the car is pulling down around 30 amp), it's hell on the AGM's cycle life as well.
Also to point out, since the OEM alternator is not the best to keep the battery topped off when the car is running (sitting at a stop light with the A/c running is going to drain down the battery since the oem alternator is only putting out about 14 amps then, while the car is pulling down around 30 amp), it's hell on the AGM's cycle life as well.