Car won't start when hot - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

JERRYwss6 · 05-14-2017, 11:06 PM

Car won't start when hot. I let it cool down for about 20-30 minutes and it'll start no problem. .

WVracer · 05-15-2017, 12:30 AM

It could be a couple things. Bad battery or alternator would be the first thing I would think. l've also heard of a bad coolant temperature sending unit causing the motor to not switch between open and closed loop. I would get your battery tested first. Hope that helps!

camguynj · 05-15-2017, 04:35 AM

Quote:

Originally Posted by JERRYwss6

Car won't start when hot. I let it cool down for about 20-30 minutes and it'll start no problem. .

Not an uncommon problem on SSs. If not batttery or alt prioblem could be bad starter or classic starter heat soak, more so if you have headers. Lots of posts about this problem and what to do about it, starting with testing battery and alt.

Bo White · 05-15-2017, 04:41 AM

Yeah whats the mileage?

JERRYwss6 · 05-15-2017, 06:41 AM

57k would it be battery/alternator even if the car cranks?

SynergyGreenSS · 05-15-2017, 10:00 AM

It's funny this was posted as I was having this same issue since Thursday. My car would crank but it wouldn't start if it was hot. I went to sears and got a new die hard battery and that solved the issue so far. If I were you, I would get a new battery just to be safe, and when you're picking it up have them check the alternator for you

WVracer · 05-15-2017, 11:11 AM

Quote:

Originally Posted by JERRYwss6

57k would it be battery/alternator even if the car cranks?

Yes because of heat soak. A hot engine is harder to get started. Heat makes everything expand. Get the battery tested.

PFL · 05-16-2017, 05:35 PM

Quote:

Originally Posted by JERRYwss6

Car won't start when hot. I let it cool down for about 20-30 minutes and it'll start no problem. .

I had this problem. Was grounding the engine. Try to see if the negative connections to the block are fine.

OnkelMatze · 05-17-2017, 12:18 AM

I had the same issue some weeks ago,

new battery didn´t solve the problem with hot cranks,
so I bought a new starter (ACDelco 12617229) and all is fine now

zfrederick · 05-17-2017, 06:29 AM

Does it have a big cam in the car?

Sent from my iPhone using Tapatalk

JERRYwss6 · 05-17-2017, 08:44 AM

Thanks for all the replies. The ground wire that goes to the passenger head has two nuts, but I lost one and I put it under with the clamps holding the wires. Car stock motor with agp twin kit. Will be wrapping the starter. reason I think it's that ground is the car had a blower with long tube headers and never has this issue until after I switched over.

05-14-2017, 11:06 PM	#1
JERRYwss6 Drives: 2011 rjt Camaro SS Join Date: Sep 2016 Location: Fort Worth, Texas Posts: 72	Car won't start when hot Car won't start when hot. I let it cool down for about 20-30 minutes and it'll start no problem. .

05-15-2017, 12:30 AM	#2
WVracer Drives: '11 2SS/RS LS3 M6 (Sold) Join Date: Dec 2015 Location: VA Posts: 200	It could be a couple things. Bad battery or alternator would be the first thing I would think. l've also heard of a bad coolant temperature sending unit causing the motor to not switch between open and closed loop. I would get your battery tested first. Hope that helps! __________________ 2011 IOM 2SS/RS LS3 M6- Injen CAI, TSP 1 7/8” headers, PTB, Hurst short throw, Corsa catback exhaust, 20" TSW Nurburgrings, BMR lower control arms, BMR tunnel brace, Hotchkis lowering springs. 3660lbs. Tuned by me (sold) 2010 RJT 1SS/RS LS3 M6- CAI, TSP 2” headers, TSP F-35 cam, PTB, Hurst short throw, Dronemaster catback, BMR lowering springs, Kirkey seats, 20”/18” Weld Belmonts, 3550lbs.

05-15-2017, 04:41 AM	#4
Bo White Drives: 2015 Summit White 2SS 1LE Join Date: Feb 2012 Location: Vance Alabama Posts: 8,019	Yeah whats the mileage? __________________ Retired wanna be cylinder head porter 2015 2SS 1LE Clutch reservoir, Vararam DRX, ported TB, TSP 2" headers, MGW shifter Totalled: 2010 1SS Wilkes Performance/Eagle 416 shortblock, TSP custom valvetrain, PRC 260 heads, Edelbrock Pro Flo 102, th400 swap, 8" PTC 5500 stall= 535/435 at the wheels tuned Gen 3 Performance and Dyno 10.97 @ 124 full weight in 3100 DA CamaroFest X

05-15-2017, 10:00 AM	#6
SynergyGreenSS Drives: 2011 2SS Join Date: Mar 2015 Location: Arlington, Texas Posts: 1,333	It's funny this was posted as I was having this same issue since Thursday. My car would crank but it wouldn't start if it was hot. I went to sears and got a new die hard battery and that solved the issue so far. If I were you, I would get a new battery just to be safe, and when you're picking it up have them check the alternator for you __________________ 2011 SS L99 LSA Supercharger, BTR Stage 3 PDS Cam, Yank 3200SS, Weapon X Stage 2 intake, LSA Heads, Flex Fuel, Ported throttle body, Speed Engineering Headers, NOWEEDS, ZL1 fuel pump, DSX AUX Pump, ID-1050X injectors, 3” pipe to NPP mufflers, 3.91 gears

05-17-2017, 06:29 AM	#10
zfrederick Drives: Black 2010 2ss Join Date: Jun 2015 Location: Pensacola Flordia Posts: 183	Does it have a big cam in the car? Sent from my iPhone using Tapatalk __________________ the parts never end!!!!!

05-15-2017, 06:41 AM	#5
JERRYwss6 Drives: 2011 rjt Camaro SS Join Date: Sep 2016 Location: Fort Worth, Texas Posts: 72	57k would it be battery/alternator even if the car cranks?

05-17-2017, 12:18 AM	#9
OnkelMatze Drives: Camaro 2SS/RS LS3 AirForce Join Date: Mar 2010 Location: Neumünster/Germany Posts: 231 View My Garage	I had the same issue some weeks ago, new battery didn´t solve the problem with hot cranks, so I bought a new starter (ACDelco 12617229) and all is fine now

05-17-2017, 08:44 AM	#11
JERRYwss6 Drives: 2011 rjt Camaro SS Join Date: Sep 2016 Location: Fort Worth, Texas Posts: 72	Thanks for all the replies. The ground wire that goes to the passenger head has two nuts, but I lost one and I put it under with the clamps holding the wires. Car stock motor with agp twin kit. Will be wrapping the starter. reason I think it's that ground is the car had a blower with long tube headers and never has this issue until after I switched over.