timing?
Thread Starter
Racer
Joined: Oct 2001
Posts: 279
Likes: 1
From: Stonewall N.C.
timing?
I'm having trouble with my'86 L-98, don't know if it 's the timing marks on the gears not lining up or not. The car runs at slow speeds well but if yougas it she will spark knock like heck. The timing is set properly and the engine heats up quickly to 200deg. under slow 35-45 mph. driving. The scanner also shows a elec. spark control code, any help sure would be studied, thanks
Burning Brakes
Joined: Feb 2000
Posts: 958
Likes: 1
From: SF Bay area, CA USA
Re: timing? (vettedreams)
The ESC code could be from when you disconected the brown wire to set the timing. You did disconnect the wire before you set the timing? Clear the codes and see if it comes back.
Generally if the timing chain slips the car won't run at all. Post the numbers for the codes you get after you clear them.
Generally if the timing chain slips the car won't run at all. Post the numbers for the codes you get after you clear them.
Team Owner
Joined: Dec 2000
Posts: 90,675
Likes: 304
From: SE NY
Cruise-In II Veteran
Re: timing? (vettedreams)
Check the connector to the knock sensor and ESC. You might pull the knock sensor to see if it's clogged, per someone's earlier post.
If you need an ESC do the upgrade sited in C4 Tech Tips or on my site. There is info on this upgrade with the GM part number there too.
If you need an ESC do the upgrade sited in C4 Tech Tips or on my site. There is info on this upgrade with the GM part number there too.
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 34
From: The Top of Utah
Re: timing? (vettedreams)
As mentioned above:
A) Make sure the EST lead is disconnected when setting the base timing.
B) Make sure you RE-connect the EST lead after setting the timing.
C) Make sure you disconnect the battery power to the ECU to clear the codes.
If you have done the above, check the damper to be sure the outer ring hasn't slipped. If it has, the 6 degrees or what ever you're setting the timing to could be WAY off. Best way I know of, is to remove the #1 spark plug. Insert sonething (screwdriver?) and bring the piston up to TDC on the power stroke. See if the timing marks indicate TDC. If not, replace the damper. Good luck.
A) Make sure the EST lead is disconnected when setting the base timing.
B) Make sure you RE-connect the EST lead after setting the timing.
C) Make sure you disconnect the battery power to the ECU to clear the codes.
If you have done the above, check the damper to be sure the outer ring hasn't slipped. If it has, the 6 degrees or what ever you're setting the timing to could be WAY off. Best way I know of, is to remove the #1 spark plug. Insert sonething (screwdriver?) and bring the piston up to TDC on the power stroke. See if the timing marks indicate TDC. If not, replace the damper. Good luck.
Thread Starter
Racer
Joined: Oct 2001
Posts: 279
Likes: 1
From: Stonewall N.C.
Re: timing? (CFI-EFI)
Thanks for all the reply's. I decided to check the timing marks on the crank, after all it was an adjustable crank gear, lesson #1. Turns out that's what the problem was, there is a 0 and a dote about the same size, I lined the cam with the 0 instead of the dote. Any way ,I put the non- adjustable c.gear on, this should do it!
