We got work to do!
Headers installed, now car won't start
Thread Starter
Intermediate
Joined: Aug 2006
Posts: 46
Likes: 0
From: Oak Creek WI
Headers installed, now car won't start
Hopefully this is something minor, but I have an '04 Z06 that has been in hybernation since Nov., and last started around New Years. Since the last time I had it running, I installed AR headers, new plugs and wires, and a Halltech Stinger Intake. I just went out to start it, and it turns over fine but won't start. The DIC reads Reduced Engine Power, followed by Service Vehicle Soon and Low Fuel. The fuel gage on the dash and the HUD read empty even though the tank is full. Everything seems to be hooked up properly, but maybe I'm missing something. Any help is appreciated.
TIA- Mike
TIA- Mike
Team Owner
Joined: Mar 1999
Posts: 22,025
Likes: 192
From: At the beach in little Rhody
Did you disconnect anything? Re-check all connections.
Is the MAF plugged in up in the Stinger setup?
Are the coils connected?
Is the motor on the driver's side of the throttle body disconnected?
Is the battery fully charged?
If all is OK, I think I might disconnect the battery for a few minutes and re-connect, but reduced engine power is safety related and it sounds like something is not connected properly.
Is the MAF plugged in up in the Stinger setup?
Are the coils connected?
Is the motor on the driver's side of the throttle body disconnected?
Is the battery fully charged?
If all is OK, I think I might disconnect the battery for a few minutes and re-connect, but reduced engine power is safety related and it sounds like something is not connected properly.
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
Mike
read and post the DTC codes:
This is the absolute best C5 Diagnostic Trouble Code (DTC) web site!!!
http://www.corvettedoctor.com/Code_Main.html
http://www.corvettedoctor.com/index.html
Go to “technical data base” and then to “Corvette ECM Computer Codes”. Then select your year car. Read the instructions and then scroll down to the "READ MORE" window to view the code definitions.\
Here is another very good site:
http://www.obd-codes.com/trouble_cod...d-ii-codes.php
Make sure to include the H or C suffix!!
Write down and post your DTC’s Then clear them ALL!
Sound effects are cool too!
While your reading this, and trying to figure out whats wrong, charge the battery! Thats the first place to start. Then read and clear ALL of your DTC Codes. Then give her another try.
If that still fails the current set DTCs should tell us whats failing.
Did you disconnect any of the following :
Coil packs
Engine grounds
MAF
PM me if you neeed to
BC
read and post the DTC codes:
This is the absolute best C5 Diagnostic Trouble Code (DTC) web site!!!
http://www.corvettedoctor.com/Code_Main.html
http://www.corvettedoctor.com/index.html
Go to “technical data base” and then to “Corvette ECM Computer Codes”. Then select your year car. Read the instructions and then scroll down to the "READ MORE" window to view the code definitions.\
Here is another very good site:
http://www.obd-codes.com/trouble_cod...d-ii-codes.php
Make sure to include the H or C suffix!!
Write down and post your DTC’s Then clear them ALL!
Sound effects are cool too!
While your reading this, and trying to figure out whats wrong, charge the battery! Thats the first place to start. Then read and clear ALL of your DTC Codes. Then give her another try.
If that still fails the current set DTCs should tell us whats failing.
Did you disconnect any of the following :
Coil packs
Engine grounds
MAF
PM me if you neeed to
BC
Thread Starter
Intermediate
Joined: Aug 2006
Posts: 46
Likes: 0
From: Oak Creek WI
Thanks for the replys guys-
Bill-
I checked the codes and and in each parameter it said NO COMM which I assume means everything is O.K. and after getting through them all said NO MORE CODES. When I installed the headers and intake I had the coils. MAF, starter, alternator, and grounds disconnected, but everything seems hooked back up properly. I had the battery disconnected while doing the work, and have had it on a float charger the past few day, so I think it should be charged.
Any more ideas would be great. I'll try disconnecting the battery for a while and see if that helps.
Thanks again- MIKE
Bill-
I checked the codes and and in each parameter it said NO COMM which I assume means everything is O.K. and after getting through them all said NO MORE CODES. When I installed the headers and intake I had the coils. MAF, starter, alternator, and grounds disconnected, but everything seems hooked back up properly. I had the battery disconnected while doing the work, and have had it on a float charger the past few day, so I think it should be charged.
Any more ideas would be great. I'll try disconnecting the battery for a while and see if that helps.
Thanks again- MIKE
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
Mike
NO COMS is B A D!!!! It means that the module is NOT commumicating with other modules. If you have all NO COMMS, you have a major electrical issue. Most likely grounded a serial buss. That's the buss that all the modules communicate on using serial digital data.
BC
BC
NO COMS is B A D!!!! It means that the module is NOT commumicating with other modules. If you have all NO COMMS, you have a major electrical issue. Most likely grounded a serial buss. That's the buss that all the modules communicate on using serial digital data. BC
BC
Burning Brakes
Joined: Feb 2004
Posts: 861
Likes: 15
From: Fayetteville NC
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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
There are basicaly THREE reasons why you would get NO COMMS for ALL the modules.
The first is, you lost power to all the modules.
The second is, you lost grounds to the modules and the most likely is, you shorted a serial buss communication wire. If you short one,,,you effect then all.
The first thing that I would do is check ALL the wiring harnesses that you touched and even the ones that are around, under or beside anything that you moved.
To the left of the BCM, you will see two small weird looking connectors:
They are the serial buss.
As weird as it might sound,,,
try this:
Shake the accordion tube that runs between the door and the door frame and then see if it will start!
The connector has a bad habbit of shorting.
Here is a prime example why:
BC
The first is, you lost power to all the modules.
The second is, you lost grounds to the modules and the most likely is, you shorted a serial buss communication wire. If you short one,,,you effect then all.
The first thing that I would do is check ALL the wiring harnesses that you touched and even the ones that are around, under or beside anything that you moved.
To the left of the BCM, you will see two small weird looking connectors:
They are the serial buss.
As weird as it might sound,,,
try this:Shake the accordion tube that runs between the door and the door frame and then see if it will start!
The connector has a bad habbit of shorting.
Here is a prime example why:
BC
Thread Starter
Intermediate
Joined: Aug 2006
Posts: 46
Likes: 0
From: Oak Creek WI
I removed the pass. side header to see if any of the wiring looked damaged and it looks fine. The 2 grounds on the drivers side and 1 on the pass. side are connected to the engine.
Bill-
Forgive my ignorance, but where exactly is the BCM. I am assuming it's the shiny component next to the fuse box in the picture, but I don't see anything like that on my car. Do I need to remove something to expose it. I also tried wiggling the door harness and that didn't work. Maybe if I let it sit over night it will cure itself
if nothing else hopefully my headache will go away.
Thanks for your time- Mike
Bill-
Forgive my ignorance, but where exactly is the BCM. I am assuming it's the shiny component next to the fuse box in the picture, but I don't see anything like that on my car. Do I need to remove something to expose it. I also tried wiggling the door harness and that didn't work. Maybe if I let it sit over night it will cure itself
if nothing else hopefully my headache will go away. Thanks for your time- Mike
Thread Starter
Intermediate
Joined: Aug 2006
Posts: 46
Likes: 0
From: Oak Creek WI
How do you tell if the serial busses are shorted or not. The only wires that I could see being affected by the header install would be those going to the O2 sensors, the grounds, and the starter wires. Other than the grounds, would these other wires affect the BCM. I should also note that in the summer months the car was only a weekend driver, and often when I would insert the key it would not remember my seat memory. I would have to push the button on the door for it to adjust. Don't know if that is a sign of a problem or not. The car is still under warranty through Sept., but I'd like to know if this is header install related or something due to the car sitting with batt. disconnected etc.
Mike
Drifting
Joined: May 2005
Posts: 1,513
Likes: 4
From: Pl Grove Utah
You double checked you did not leave the grounds above the starter on pass side block/rear unhooked ?Do you have a check engine light/bulb check with key on ? Tach showing movement/rpm while cranking ? Nobody got anxious and touched a hot wire/back of alternator or starter and popped a fuse ? Besides the fuse box near the battery there is also one near BCM in pass floorboard.Just a couple things to look at,good luck !
Night Owl for life
Joined: Nov 2003
Posts: 24,730
Likes: 4,564
From: Bugs Bunny should'a made a left turn here
when i installed my headers, i forgot to plug in the crank position sensor. it is #1 as pictured below:
check to see if that is plugged in. my car started right up after it was plugged in.
check to see if that is plugged in. my car started right up after it was plugged in.
Thread Starter
Intermediate
Joined: Aug 2006
Posts: 46
Likes: 0
From: Oak Creek WI
Finally got a chance to work on the car tonight and I found my problem. Only had one of the 2 grounds hooked up on the pass. side. The little one got buried behind the starter and I forgot about it. Got it put back together and it fired right up.
Love the sound of the new AR's.
It's -4 outside right now so I think it's going to be a while before it sees the road.
Thanks Bill and everyone else for taking the time to help me out. I appreciate it.
Mike
Love the sound of the new AR's. It's -4 outside right now so I think it's going to be a while before it sees the road. Thanks Bill and everyone else for taking the time to help me out. I appreciate it. Mike
Le Mans Master
Joined: Mar 2002
Posts: 5,300
Likes: 4
From: Mississauga, Ontario Corvettes were built to be driven...not trailered
St Jude Donor '07-'08-'09
Glad you found it and not surprises BC had a hand in it. When he was in Toronto last year, us C5 guys learned more from him in one day then we knew collectively in all our years of ownership
