C7 Z06 problem
Thread Starter
8th Gear
Joined: Mar 2015
Posts: 8
Likes: 0
From: Summerfield Fl
C7 Z06 problem
I posted this in the C7 section and since found out that there is a Z06 section.
I would like to know if anyone else has this problem with their C7 Z06.
After it sits over night in the garage when I start it up it turns over 8 to 12 times before it starts. And when cold at idle it is running a little rough. If I sit in the car as it is warming up I can feel a miss. I know this isn't right because a friend has a 2015 Z06 8 spd auto just like mine and it does not do this. My dealer says it is OK and I know that it isn't. Anyone have any ideas?
Dan
I would like to know if anyone else has this problem with their C7 Z06.
After it sits over night in the garage when I start it up it turns over 8 to 12 times before it starts. And when cold at idle it is running a little rough. If I sit in the car as it is warming up I can feel a miss. I know this isn't right because a friend has a 2015 Z06 8 spd auto just like mine and it does not do this. My dealer says it is OK and I know that it isn't. Anyone have any ideas?
Dan
Melting Slicks
Joined: Feb 2002
Posts: 2,500
Likes: 109
From: Severn Maryland
St. Jude Donor '05-'10-'11-'12-'13-'14-'15
I posted this in the C7 section and since found out that there is a Z06 section.
I would like to know if anyone else has this problem with their C7 Z06.
After it sits over night in the garage when I start it up it turns over 8 to 12 times before it starts. And when cold at idle it is running a little rough. If I sit in the car as it is warming up I can feel a miss. I know this isn't right because a friend has a 2015 Z06 8 spd auto just like mine and it does not do this. My dealer says it is OK and I know that it isn't. Anyone have any ideas?
Dan
I would like to know if anyone else has this problem with their C7 Z06.
After it sits over night in the garage when I start it up it turns over 8 to 12 times before it starts. And when cold at idle it is running a little rough. If I sit in the car as it is warming up I can feel a miss. I know this isn't right because a friend has a 2015 Z06 8 spd auto just like mine and it does not do this. My dealer says it is OK and I know that it isn't. Anyone have any ideas?
Dan
Advanced
Joined: Sep 2010
Posts: 95
Likes: 3
From: NorCal
I posted this in the C7 section and since found out that there is a Z06 section.
I would like to know if anyone else has this problem with their C7 Z06.
After it sits over night in the garage when I start it up it turns over 8 to 12 times before it starts. And when cold at idle it is running a little rough. If I sit in the car as it is warming up I can feel a miss. I know this isn't right because a friend has a 2015 Z06 8 spd auto just like mine and it does not do this. My dealer says it is OK and I know that it isn't. Anyone have any ideas?
Dan
I would like to know if anyone else has this problem with their C7 Z06.
After it sits over night in the garage when I start it up it turns over 8 to 12 times before it starts. And when cold at idle it is running a little rough. If I sit in the car as it is warming up I can feel a miss. I know this isn't right because a friend has a 2015 Z06 8 spd auto just like mine and it does not do this. My dealer says it is OK and I know that it isn't. Anyone have any ideas?
Dan
6th Gear
Joined: Mar 2015
Posts: 6
Likes: 0
cranking
My new Z06 A8 also takes some cranks before engine catches. My guess would be that the fuel pump has to get some gas in the lines before it catches. Once its hits, the car starts right up.
My 2002 Z06 also took some time, unless I allowed the fuel pump to fill the lines before cranking. That was possible to do in the old days!
My 2002 Z06 also took some time, unless I allowed the fuel pump to fill the lines before cranking. That was possible to do in the old days!
Le Mans Master
Joined: Nov 2002
Posts: 6,970
Likes: 14
From: Calif
My new Z06 A8 also takes some cranks before engine catches. My guess would be that the fuel pump has to get some gas in the lines before it catches. Once its hits, the car starts right up.
My 2002 Z06 also took some time, unless I allowed the fuel pump to fill the lines before cranking. That was possible to do in the old days!
My 2002 Z06 also took some time, unless I allowed the fuel pump to fill the lines before cranking. That was possible to do in the old days!
Thread Starter
8th Gear
Joined: Mar 2015
Posts: 8
Likes: 0
From: Summerfield Fl
A friend has a 2015 Z06 and he says it starts up immediately after an overnight cool down.
Maybe he is just lucky. Anyway the dealer is going to look at it again next week. I will insist they check for codes.
Thanks for the input.
Dan
Maybe he is just lucky. Anyway the dealer is going to look at it again next week. I will insist they check for codes.
Thanks for the input.
Dan
Melting Slicks
Joined: May 2004
Posts: 2,426
Likes: 285
From: West Barnstable MA
I had a similar problem on my 2004 Convertible. There was a O-ring in the fuel tank that was leaking pressure overnight, so the fuel pump had to build up the pressure for the engine to start.
Dealer found it by putting a pressure gauge on the car and left it overnight. Pressure in the morning was down to zero.
I think that they found out the specific source of the leak by a "smoke test" as I recall.
Good luck.
Dealer found it by putting a pressure gauge on the car and left it overnight. Pressure in the morning was down to zero.
I think that they found out the specific source of the leak by a "smoke test" as I recall.
Good luck.
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Thread Starter
8th Gear
Joined: Mar 2015
Posts: 8
Likes: 0
From: Summerfield Fl
Safety Car
Joined: May 2000
Posts: 4,827
Likes: 352
From: Albuquerque NM
It's normal. These direct injection engines operate at VERY high fuel pressure, over 2,000 PSI. The pump in the tank only gets it to about 60 PSI, a mechanical pump run off the camshaft pressurizes it from there. This takes a little time.
Le Mans Master
Joined: Oct 2004
Posts: 6,813
Likes: 287
From: Toronto Ontario Canada
The OP also noted that his friend has the same car and it starts up immediately. So either his friends car is the oddball or a number of cars have an issue. It would be interesting to note how this shakes out.
Racer
Joined: Dec 2010
Posts: 326
Likes: 6
From: Tampa Fl
Good to know. I also noticed that the Z's engine took a few more turns to start than in my C6. Didn't perceive it as a problem, but was curious about it.
Le Mans Master
Joined: Sep 2003
Posts: 8,934
Likes: 657
From: Norwalk ohio
2019 Corvette of the Year Winner
St. Jude Donor '15
When I start my '37 Ford that has a 396 with blower, I always turn the key on first and let the fuel pump fill up the lines and pressurized before I hit the key the rest of the way to engage starter......makes sense....
Team Owner
Joined: Aug 2011
Posts: 21,590
Likes: 1,615
From: GREER SC
Yes, it is perfectly fine. Our direct injection requires a very high fuel pressure and it takes a few seconds to build up to that and the slight miss is from the relatively cold range spark plugs that are required for the boost. It takes the plugs a moment as well because of the high pressure they have to survive under.
Drifting
Joined: May 2011
Posts: 1,300
Likes: 39
From: White Oak NC
Hit the blue button and ask OnStar to give you any codes. They're very helpful. Hope nothing is in fact wrong with your Z and that you're having a great time with it otherwise.
