SYS flashing

[petervankleeck]

Without the engine running, when I put the key in the ignition the SYS flashes on the dash. Starts right up, flashing the SYS, strongly runs for an undetermined amount of time and stalls. Throws the C41 code. New fuel pumps and fuel relays. Could the key chip be the problem? Just installed the Haibeck AYBKG chip. Resolved all kinds of issues (idle is perfect; runs cooler; and all this time I thought the high idle was a missed vacuum leak) but this SYS persists. It's not the ECM. Runs like a champ, when it's running. Any help would be appreciated.

Thanks!

Peter

1990 ZR1 #659

[DRM500RUBYZR-1]

Remove your battery and have it load tested.
Let us know what you find.
How old is it, and how long has the car been sitting?
Thanks,
Marty

[petervankleeck]

Marty, Thanks for the reply. I drive the car every day but not far or for more than 30mins before it conks out. Battery is new. Any help would be appreciated.

Thanks!

Peter

[DRM500RUBYZR-1]

Peter,
Please:
1 have the battery checked
2 have the alternator output checked
3 check and inspect both battery cables and especially the bolts

I want to rule out the most common causes first.

Most SYS issues are electrical in nature, or CCM problems.
But electrical are the leading culprits.
Marty

[petervankleeck]

Marty, Thanks! Will do.

Peter

[dredgeguy]

Peter,
Wazoo is having a maintenance day on Oct 12. Take a look in the Mid-Atlantic section of this forum. You are more or less local and we have several from VA who come up for maintenance days. Great bunch of guys, most helpful and certainly know the ZR-1. Hope you can make it.

[DRM500RUBYZR-1]

Peter,
Charlie's suggestion is an excellent one!
Not only do you have an opportunity to meet other area owners, but there will be talent there that can quickly rule out many of the usual suspects!
If you can make that, it would be well worth your time!
Marty

[petervankleeck]

Charlie and Marty, Will make every effort to make it. You’re right, that gathering of experienced owners would be invaluable help.

Thanks again!

Petet

[petervankleeck]

SYS flashes
C41 code — intermittent
4. ERR — intermittent
Sometimes the Select Ride light comes on on the dash and then goes away. (I remember something important running through the selective ride module.)
When the car stalls, the fans run and the 1-4 light flashes intermittently with the key on.
Car turns over and sputters like it wants to start but never does. Trying to start the car while the fans are running just runs the battery down.
When you turn the key on and the fans don’t run you know the car will start.
After stalling once, it will stall again within a few miles. Sometimes it starts again, sometimes it doesn’t.
It sounds like there is no fuel; there is spark and air.
Always starts in the morning.
Before it conks out it is scary fast. Idle is perfect; excellent acceleration, and then...
Runs a little rich when idling.

New
Haibeck chip
Coils, wires, plugs
Fuel pumps
Fuel relays
Injectors

Until I can get up to Maryland, maybe someone has some insight into this problem. I’m going to start with an upgraded battery and alternator. I’d like to drive the car up to Maryland if I can get this figured out.

Thanks!

Peter

Thanks!

[petervankleeck]

Checked the battery and Alternator:
Battery 12.39V
Alternator 14V

What's next?

On Sunday afternoon, all the codes were clear and my son and I went for a ride. Later that evening, the SYS light was back on and I left it at home.

The car will run for 20-30 mins with the SYS light flashing (C41)

Thanks!

Peter