Hard start
Thread Starter
Instructor
Joined: Jan 2004
Posts: 242
Likes: 4
From: deland fl
Hard start
I recently sold my 2019 grand sport coupe and bought a 2012 grand sport convertible; best move I've made lately. I have one concern.
When starting, it cranks for five or six seconds before it fires. I know that is not a big deal but if you are sitting in the driver's seat, that time seems bigger. My other vehicles that are fuel injected always fire on the first rotation and that includes my old gmc truck with 250,000 miles.
My question, is there a check valve in the fuel line somewhere that is supposed to stop fuel from draining back to the tank when the engine is shut down? Cause fuel starvation at start-up if defective? And promise me if there is one, it will be easy to get at...
Thanks guys
When starting, it cranks for five or six seconds before it fires. I know that is not a big deal but if you are sitting in the driver's seat, that time seems bigger. My other vehicles that are fuel injected always fire on the first rotation and that includes my old gmc truck with 250,000 miles.
My question, is there a check valve in the fuel line somewhere that is supposed to stop fuel from draining back to the tank when the engine is shut down? Cause fuel starvation at start-up if defective? And promise me if there is one, it will be easy to get at...
Thanks guys
Melting Slicks
Joined: Apr 2019
Posts: 2,487
Likes: 1,151
From: Northern Wisconsin
Yes, there is a check valve, but it is not easy to get at because it is part of the fuel pump in the gas tank. One easy diagnostic step I would do for now is to put a fuel pressure gauge on the fuel rail to see if the fuel pressure bleeds off when shut down and how fast it builds back up to operating pressure (58 psi) when cranking.
Drifting
Joined: Jul 2003
Posts: 1,868
Likes: 294
From: West of Burlington, Ontario Canada
I recently sold my 2019 grand sport coupe and bought a 2012 grand sport convertible; best move I've made lately. I have one concern.
When starting, it cranks for five or six seconds before it fires. I know that is not a big deal but if you are sitting in the driver's seat, that time seems bigger. My other vehicles that are fuel injected always fire on the first rotation and that includes my old gmc truck with 250,000 miles.
My question, is there a check valve in the fuel line somewhere that is supposed to stop fuel from draining back to the tank when the engine is shut down? Cause fuel starvation at start-up if defective? And promise me if there is one, it will be easy to get at...
Thanks guys
When starting, it cranks for five or six seconds before it fires. I know that is not a big deal but if you are sitting in the driver's seat, that time seems bigger. My other vehicles that are fuel injected always fire on the first rotation and that includes my old gmc truck with 250,000 miles.
My question, is there a check valve in the fuel line somewhere that is supposed to stop fuel from draining back to the tank when the engine is shut down? Cause fuel starvation at start-up if defective? And promise me if there is one, it will be easy to get at...
Thanks guys
To turn the ignition on without cranking, If it's a manual, push the start button without pushing the clutch pedal. If it's an auto, push the bottom of the start button for about 3 seconds.
Check to see if you have any leaky injectors as well.
Last edited by GMJim; Dec 5, 2022 at 06:01 PM.
Race Director
Joined: Oct 2004
Posts: 12,795
Likes: 4,614
Good suggestion!! Also, if you have any codes, the cam position sensor, or wiring, could have an issue. This will cause long cranking times until the PCM figures out where the crankshaft/camshaft are. I got lazy routing the cam position wiring harness once, and the damn Serpentine belt wore through the wires!! You'll only do this once, I guarantee it!!!! 
Thread Starter
Instructor
Joined: Jan 2004
Posts: 242
Likes: 4
From: deland fl
Thanks for the help guys. I don't have the tools or ability to do "hands on" for any of these suggestions which all make sense. I bought the car from Carvana two weeks ago and finally realized I have a 100 day warranty. This issue should be covered so I have an appointment at the local chevy dealership Friday. I'll let you all know what happens. Again, many thanks to you guys. I'm 79 years old and need all the help I can get
Larry
Larry
Moderator, Tech Contributor
Joined: Sep 2013
Posts: 15,319
Likes: 3,927
From: Cape Coral, Florida
If your dealership can’t diagnose your issue which they probably can’t and you want to drive over to the Gulf side I’d be more than happy to look at your car…I can highly recommend a diagnostic shop in Melbourne if you want to stay more local !!…BTW if it is a cam sensor ask your dealership if they are going to use a scope to test the cam sensor…a little hint…they don’t use one so they’ll only be guessing.
Thread Starter
Instructor
Joined: Jan 2004
Posts: 242
Likes: 4
From: deland fl
Finally got the car back from dealership. All repaired and working as it should. According to Carfax, it was serviced on 6-01-2022 and included fuel level sending unit and fuel pump replaced. I will not fault Carvana for any of this but think they might find a different service facility (which shall remain nameless) to service cars they are selling. According to my dealership, they had to drop both tanks and found level senser in right tank jammed up, the crossover tube reversed, and the fuel send and return pipe broken and held together with wire ties and no O-rings. If you ever need a fuel send and return pipe, part number 10337583, good luck. After a week on the phone I finally found one, that could be bought, in South Carolina, thank you parts guy Benny. After all of this, the warranty company paid over $4,000. I paid $200 deductible. I now have a fantastic corvette for which I thank and reccomend Carvana.
Larry
Larry
Retired & lovin' it!
Joined: Mar 2005
Posts: 4,471
Likes: 543
From: Jackson NJ
Finally got the car back from dealership. All repaired and working as it should. According to Carfax, it was serviced on 6-01-2022 and included fuel level sending unit and fuel pump replaced. I will not fault Carvana for any of this but think they might find a different service facility (which shall remain nameless) to service cars they are selling. According to my dealership, they had to drop both tanks and found level senser in right tank jammed up, the crossover tube reversed, and the fuel send and return pipe broken and held together with wire ties and no O-rings. If you ever need a fuel send and return pipe, part number 10337583, good luck. After a week on the phone I finally found one, that could be bought, in South Carolina, thank you parts guy Benny. After all of this, the warranty company paid over $4,000. I paid $200 deductible. I now have a fantastic corvette for which I thank and recommend Carvana.
Larry
Larry
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