Intermittent crank with no fire.
Thread Starter
Racer
Joined: Aug 2011
Posts: 402
Likes: 9
From: NJ
Intermittent crank with no fire.
Here is where I am at with this. Since I bought my 99 it will only sometimes crank and not fire. All i do is back off the key and hit it again an fires right up.
Sometimes it starts fine. Car seems to run fine, no codes.
I just changed the cam sensor which had no effect on this condition. Would my next item to change be the crank sensor?? any ideas thankyou.
I think you have to drop the starter to get with the crank sensor?
Sometimes it starts fine. Car seems to run fine, no codes.
I just changed the cam sensor which had no effect on this condition. Would my next item to change be the crank sensor?? any ideas thankyou.
I think you have to drop the starter to get with the crank sensor?
Safety Car
Joined: Dec 2010
Posts: 4,820
Likes: 34
From: Ravensdale WA
I wuld suspect more like a bad relay or ignition switch. Corroded contacts on the run circuit sometimes not making a good contact. Also check the ground points and connectors. Sounds more like a weak connection of some kind. 
Team Owner
Joined: May 2001
Posts: 36,836
Likes: 244
From: Dear Karma, I have a list of people you missed.
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15-'16
Here is where I am at with this. Since I bought my 99 it will only sometimes crank and not fire. All i do is back off the key and hit it again an fires right up.
Sometimes it starts fine. Car seems to run fine, no codes.
I just changed the cam sensor which had no effect on this condition. Would my next item to change be the crank sensor?? any ideas thankyou.
I think you have to drop the starter to get with the crank sensor?
Sometimes it starts fine. Car seems to run fine, no codes.
I just changed the cam sensor which had no effect on this condition. Would my next item to change be the crank sensor?? any ideas thankyou.
I think you have to drop the starter to get with the crank sensor?
Thread Starter
Racer
Joined: Aug 2011
Posts: 402
Likes: 9
From: NJ
Team Owner
Joined: Jul 2012
Posts: 34,479
Likes: 532
From: Central PA. - - My AR15 identifies as a muzzleloader
I believe in the Beer Fairy
I had the same problem, especially when cold. First thing in the AM, mine was getting to be a pita to start. Had to throttle up pretty good to get it to fire. Ran a can of Techron through the tank and hasn't done it since. Might not be your trouble, but it's a cheap thing to try.
Team Owner
Joined: May 2001
Posts: 36,836
Likes: 244
From: Dear Karma, I have a list of people you missed.
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15-'16
This is a typical one and it reads 0 to 100 psi:
Pressure should be 58 psi (~). It should hold for quite awhile and not bleed back down quickly. If it does, there's a problem.
Team Owner
Joined: Jul 2012
Posts: 34,479
Likes: 532
From: Central PA. - - My AR15 identifies as a muzzleloader
I believe in the Beer Fairy
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Drifting
Joined: Feb 2008
Posts: 1,596
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From: Bahama North Carolina
Thread Starter
Racer
Joined: Aug 2011
Posts: 402
Likes: 9
From: NJ
After I did some real trials to find the problem. This is what I discovered. I was wrong about the crank and no fire. It sometimes fires right up but sometimes it cranks for 3-4 seconds then fires up. I really have to hold the key and wait for it to crank and fire, but it never "doesnt fire" it will always start.
I am gonna clean the contacts in the ignition like bill curlee talks about.
I am gonna clean the contacts in the ignition like bill curlee talks about.
Drifting
Joined: Nov 2005
Posts: 1,320
Likes: 242
From: NW Chicago
St. Jude Donor '12-'13-'14-'15
Fuel line check-valve not holding? Two different systems for c-5, not sure of year of change, 97 & 98 one system, 99 and later different? Found this:
http://forums.corvetteforum.com/c5-g...e-diagram.html
http://forums.corvetteforum.com/c5-g...e-diagram.html
Thread Starter
Racer
Joined: Aug 2011
Posts: 402
Likes: 9
From: NJ
I finally got around to getting a fuel pressure gauge. So what happens is I turn the key to ON and i hear the fuel pump. As its buzzing its at 60psi, then it drops right down to under 20psi.
Also when I put the gauge on before i fired the pump up there was no pressure at all. even if it sat for 2 days i would imagine there would be a little bit of pressure left.
So I believe its a check valve but not sure if its the return line or feed line.
Im going off this post:
http://forums.corvetteforum.com/c5-t...ee-inside.html
Also when I put the gauge on before i fired the pump up there was no pressure at all. even if it sat for 2 days i would imagine there would be a little bit of pressure left.
So I believe its a check valve but not sure if its the return line or feed line.
Im going off this post:
http://forums.corvetteforum.com/c5-t...ee-inside.html
Thread Starter
Racer
Joined: Aug 2011
Posts: 402
Likes: 9
From: NJ
I know it's old thread but i fixed the issue finally. I replaced rear fuel feed pipe GM part 10448899 . It's a bitch to do but it was so worth it. Car fires instantly now. Fuel pressure holds steady on fuel pump prime. Thanks to lonestarFRC.
Team Owner
Joined: May 2001
Posts: 36,836
Likes: 244
From: Dear Karma, I have a list of people you missed.
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15-'16
Sadly, that part is no longer available new from GM. 
You're welcome.....GTH
