Trouble starting when engine is hot - Team Camaro Tech
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post #1 of 11 (permalink) Old May 31st, 17, 03:38 PM Thread Starter
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Trouble starting when engine is hot

So we are working the bugs out and I have run into the issue of the engine not wanting to start when warm.
It hasn't happened all the time, but enough to be an issue. Especially last friday night when I took the wife out for ice cream

For clarification, its an 2016 LS3/480 connect and cruise from Chevy

It cranks over just fine. It acts alot like its either flooded, vaporized fuel or its not getting enough fuel.
After sitting and waiting for about 15-20 minutes, I got the car to start and ran my idle up to about 3000 rpm for about 20-30 seconds only to have it stop when I let my foot off the gas and let it idle. After that I couldn't get it started again. So I crossed off the "not getting enough fuel" off my list.

Has anyone else run into this?
I spoke to the local LS guru and he mentioned that with the battery in the trunk, I still need a ground from engine to frame and it could be as simple as that. hmm. Trying that and I will let you know.
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post #2 of 11 (permalink) Old May 31st, 17, 04:18 PM
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Re: Trouble starting when engine is hot

if your engine is not grounded that electricity is going to go to the next least resistant path. im surprised that you didnt burn the computer.

when i mistakenly never tightened the engine ground strap, i turned the key and the coil blew up lol.

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post #3 of 11 (permalink) Old May 31st, 17, 05:41 PM
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Re: Trouble starting when engine is hot

Any DTC present ??

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post #4 of 11 (permalink) Old May 31st, 17, 09:07 PM Thread Starter
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Re: Trouble starting when engine is hot

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any dtc present ??
dtc?
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post #5 of 11 (permalink) Old Jun 1st, 17, 05:22 AM
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Trouble codes
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post #6 of 11 (permalink) Old Jun 1st, 17, 06:19 AM
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Re: Trouble starting when engine is hot

As others suggest, with battery in trunk, ensure all electrical paths are physically good.
For grins & giggles, measure the voltage loss from positive post, not the clamp, to solenoid stud.
Yes, you will need a lead extension on your meter and after attaching long lead, touch the meter leads together allowing the meter to 'zero' itself, then hook up meter leads.
I would wager you will find at least a one volt drop, because of wire resistance and heat generated within the wire/cable.
More heat, more resistance.
This power drop will be enough in providing less power for the other circuits, besides starting, therefore, the injector circuits, and ignition circuits won't work, thus, cranks, but no start.

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post #7 of 11 (permalink) Old Jun 1st, 17, 06:24 AM
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Re: Trouble starting when engine is hot

Maybe have to change the cranking fuel to engine coolant temp ratio, fuel prime... sounds like it needs some laptop tuning.

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post #8 of 11 (permalink) Old Jun 1st, 17, 07:00 AM
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Re: Trouble starting when engine is hot

If you have a voltage drop you could be seeing a drop in fuel pressure and that could cause some issues. I know one time when my battery was low my fuel rail pressure dropped down to 50 instead of 58. It still ran, but it ran a little funny. If your voltage drop is more severe it could cause very low fuel pressure and possibly combine that with a heat soaked engine and you could be evaporating the fuel from your rail. I could be totally off base, just a guess.

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post #9 of 11 (permalink) Old Jun 1st, 17, 03:41 PM
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Re: Trouble starting when engine is hot

Quote:
Originally Posted by stinger67 View Post
dtc?
Diagnostic Trouble Codes.
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post #10 of 11 (permalink) Old Dec 13th, 17, 09:21 PM
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Re: Trouble starting when engine is hot

I'd also be looking at what type of fuel pump and filter you are using. If you are using a vette filter with regulator and a super high psi pump it can damage the internal regulator bleeding off fuel from getting to the rail and out the return side. If that's good then Id be looking at vacuum leaks/ faulty maf.
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post #11 of 11 (permalink) Old Dec 14th, 17, 08:43 AM
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Re: Trouble starting when engine is hot

Possibly check for exhaust leaks near the O2 sensor as well, I believe that can cause issues with idling if I recall correctly.

Edit: RIP, didn't see this was an older thread.

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