Intermittent cutting out. Bill C?
Thread Starter
AMP Racing
Joined: Aug 2006
Posts: 10,756
Likes: 589
From: Washington TWP NJ
2023 C5 of the Year Finalist - Modified
2017 C5 of Year Finalist
St. Jude Donor '09-'10-'11-'12
Intermittent cutting out. Bill C?
Bill, I did the procedure you outline here. http://forums.corvetteforum.com/c5-t...ch-repair.html
Thanks for pointing me in that direction. While I certainly did have some burnt contacts, after cleaning them I still have my unique problem.
At high rpm I get an intermittent cutting out. On the dyno it was at 7450. On the track its at 7000. The solution is to shift at 6000. But that's not the cure.
When it cuts out, it's as if I shut the key off. My HPTuners scanner loses the signal and restarts. The check engine light comes on briefly and goes back out. All the gauges go to zero and come right back on. It's literally as if I turned the key off while going down the track.
I've checked and cleaned all the grounds. I've checked all the connections to sensors, battery, fuse box, coil packs, etc.
It's frustrating. My next thing to check will be to ohm out all the wires in the engine harness. That won't be fun, but likely necessary.
Any thoughts on this from anyone here?
Thanks.
Thanks for pointing me in that direction. While I certainly did have some burnt contacts, after cleaning them I still have my unique problem.
At high rpm I get an intermittent cutting out. On the dyno it was at 7450. On the track its at 7000. The solution is to shift at 6000. But that's not the cure.
When it cuts out, it's as if I shut the key off. My HPTuners scanner loses the signal and restarts. The check engine light comes on briefly and goes back out. All the gauges go to zero and come right back on. It's literally as if I turned the key off while going down the track.
I've checked and cleaned all the grounds. I've checked all the connections to sensors, battery, fuse box, coil packs, etc.
It's frustrating. My next thing to check will be to ohm out all the wires in the engine harness. That won't be fun, but likely necessary.
Any thoughts on this from anyone here?
Thanks.
Racer
Joined: Oct 2003
Posts: 491
Likes: 1
From: Owasso OK
I would suggest going back over your engine grounds. Especially G106 ( rt side of engine block above starter) that is your ground for PCM/ TAC/ MAF. You might want to check continuity on the grounds with a meter.
I had a similar problem last year, engine would cut out at high rpm, gauges would sweep erratically, check engine light would flash. Finally found my problem when i came across G106 ground, it was hanging on by a few strands, it literally broke off when i was checking it for tightness. I spliced in a new terminal and the problem never returned. It's been over six months trouble free. Good luck!
I had a similar problem last year, engine would cut out at high rpm, gauges would sweep erratically, check engine light would flash. Finally found my problem when i came across G106 ground, it was hanging on by a few strands, it literally broke off when i was checking it for tightness. I spliced in a new terminal and the problem never returned. It's been over six months trouble free. Good luck!
Thread Starter
AMP Racing
Joined: Aug 2006
Posts: 10,756
Likes: 589
From: Washington TWP NJ
2023 C5 of the Year Finalist - Modified
2017 C5 of Year Finalist
St. Jude Donor '09-'10-'11-'12
I've checked all the grounds and they're solid. I haven't ohm'd out the wires yet. That'll be my next project.
Melting Slicks
Joined: Apr 2009
Posts: 2,479
Likes: 36
Intermittent cutting out. Bill C?
Keep your eye on the CKP sensor. Is there a way to check it with your Scanner/ Tuner? They can often fail intermittently and cause your engine to shut down. It can be wiring or grounds but if everything checks out, I'd suspect the CKP sensor.
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
Your OBD2 port is powered with HOT AT ALL TIMES powered 12 VDC. IF,, you are resetting the HP Tuners suite,, you are loseing power at that port AND most likely other circuits. next to the battery DO NOT forget the chassis ground G-104/108 as it grounds ALL the chassis stuff to the battery.
That power comes directly off the battery and is fairly easy to trace and examine.
Start at the battery terminals Neg and Pos and make sure that they are clean and tight and the CRIMPED connection under the rubber sheif is not burnt corroded or loose.
From the battery, the power goes to the 12VDC B+ terminal on the under hood fuse box. Make sure its clean and tight.
The second wire on that terminal goes to the Passengers Fuse Box in the foot well. Take the fuse box out and make sure that the connect ion is clean and tight. The ALDL port is protected by the C/ALDL fuse (#29 in the 98 Manual)
It sounds like you are losing power on more than just the ALDL circuit so look for a MAIN POWER WIRE or CONNECTION issue that might be disturbed at a high vibration event or high force event.
Put that theory to bed and see what you find.
Bill
That power comes directly off the battery and is fairly easy to trace and examine.
Start at the battery terminals Neg and Pos and make sure that they are clean and tight and the CRIMPED connection under the rubber sheif is not burnt corroded or loose.
From the battery, the power goes to the 12VDC B+ terminal on the under hood fuse box. Make sure its clean and tight.
The second wire on that terminal goes to the Passengers Fuse Box in the foot well. Take the fuse box out and make sure that the connect ion is clean and tight. The ALDL port is protected by the C/ALDL fuse (#29 in the 98 Manual)
It sounds like you are losing power on more than just the ALDL circuit so look for a MAIN POWER WIRE or CONNECTION issue that might be disturbed at a high vibration event or high force event.
Put that theory to bed and see what you find.
Bill
Last edited by Bill Curlee; Jul 18, 2015 at 04:21 PM.
Thread Starter
AMP Racing
Joined: Aug 2006
Posts: 10,756
Likes: 589
From: Washington TWP NJ
2023 C5 of the Year Finalist - Modified
2017 C5 of Year Finalist
St. Jude Donor '09-'10-'11-'12
Thanks for the tips. I believe I've been very thorough in my examination under the hood, but I haven't checked much inside the car. I'll check the pass foot well and that fuse box, as well as recheck everything under the hood.
Thanks for the suggestions.
Thanks for the suggestions.
