85' Vette Pinging Problem
Race Director
Joined: Dec 2000
Posts: 17,551
Likes: 26
From: El Paso Texas
Originally Posted by redwing76
Crank sensor on a L-98?
The manual calls for 6 degrees of timing, but you should be able to get away with more and pick up a little low end power. I'm running 10 degrees of base timing on my 84 on regular fuel with no detonation.
BTW, I trust you have smarts enough to back off the throttle if it sounds like the motor is crushing marbles. Bad detonation is an easy way to burn a hole in a piston. Find this problem and fix it ASAP.
Last edited by Frizlefrak; Jan 10, 2005 at 01:10 PM.
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Burning Brakes
Joined: Aug 2001
Posts: 1,038
Likes: 15
From: Brick- Next to the land of Mojo NJ
Originally Posted by redwing76
Crank sensor on a L-98?
Race Director
Joined: Jun 1999
Posts: 14,924
Likes: 9
From: Merritt Ils Fl
Since it wsn't mentioned I assume no codes are being set. Strange if not. Does the SES light come on at start up? I suggest you pull whatever codes may be set,assuming the SES works. Next make sure your knock sensor is present and connected. Then check the connection of the ESC module. My kneejerk guess is one of these latter two are not doing their job.
Team Owner
Joined: Aug 2000
Posts: 40,156
Likes: 45
From: San Pedro CA
Originally Posted by 1991camaro
maybe he means the reluctor ring in the distrib.......kinda acts like an archaic crank sensor when you think about it
Race Director
Joined: Dec 2000
Posts: 17,551
Likes: 26
From: El Paso Texas
Originally Posted by 85 500 horse
If the "crank" sensor is not the problem, I would next check the fallopian tube and the ovary sensor. Every month, they seem to act up in the worst way.
Speaking from experience?
Instructor
Joined: Dec 2004
Posts: 136
Likes: 0
ESC??? SES??? Sorry, I'm brand new to the Corvette/Chevy/Domestic car thing. You have to excuse my ignorance. Not that I'm ignorant about cars....NO! far from it, but when it comes to domestic autos, I feel like a fish out of water sometimes. I do have a repair manual so I guess I could just look it up 
FYI, I'm running 91 octane, that's as good as it get's in AZ....unless you step it up to 110 race gas 
(OVERKILL for N/A applications)
FYI, I'm running 91 octane, that's as good as it get's in AZ....unless you step it up to 110 race gas (OVERKILL for N/A applications)
Team Owner
Joined: Aug 2000
Posts: 40,156
Likes: 45
From: San Pedro CA
SES = Service Engine Soon light. On the dash is a screen where any number of warnings and such. When you start the car, the SES light should come on. This is done as a self test.
If the light does NOT come on, bet money that the bulb is dead.
If the bulb is dead (or sometimes REMOVED!) then codes won't display.
If the bulb is good, and does not display anything, then there could be deeper problems.
The manual you have, is it the Helms (GM Factory Service manual)? The Chiltons and Haynes are pretty crappy, really. They don't give anything for year specific troubleshooting. If you don't have the Helms, get one - www.helminc.com.
ESC - Electronic Spark Control. This is what controls the knock sensor. If it isn't working right, it will cause all sorts of drivabilty issues.
I hope this helps.
If the light does NOT come on, bet money that the bulb is dead.
If the bulb is dead (or sometimes REMOVED!) then codes won't display.
If the bulb is good, and does not display anything, then there could be deeper problems.
The manual you have, is it the Helms (GM Factory Service manual)? The Chiltons and Haynes are pretty crappy, really. They don't give anything for year specific troubleshooting. If you don't have the Helms, get one - www.helminc.com.
ESC - Electronic Spark Control. This is what controls the knock sensor. If it isn't working right, it will cause all sorts of drivabilty issues.
I hope this helps.
Le Mans Master
Joined: Oct 2003
Posts: 6,130
Likes: 2
From: seattle WA
5 years of sitting=alot of condensation in the fuel tank, hope you
used a fuel additive to remove water, Seafoam is a great idea.Don't know about your year specific, but I beleive you need to disconnect the ESC to check your base timing.
used a fuel additive to remove water, Seafoam is a great idea.Don't know about your year specific, but I beleive you need to disconnect the ESC to check your base timing.
Le Mans Master
Joined: Dec 2002
Posts: 6,715
Likes: 2
From: Santa Teresa New Mexico
Originally Posted by 85 500 horse
If the "crank" sensor is not the problem, I would next check the fallopian tube and the ovary sensor. Every month, they seem to act up in the worst way.
