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Username Post: ESC Sticky - board help needed        (Topic#176666)
gchemist 
Senior Chevytalk Moderator
Posts: 21838
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
12-08-07 05:44 PM - Post#1314075    

imapalmark suggested we make an ESC thread. We need boardmembers help to help other 73-87 truck owners.

The following information is provided by swervin ervin.
ESC distributor removal or by pass article:
http://www.73-87.com/7387garage/drivetrain /escrepl...

ESC wiring bypass picture: http://www.73-87.com/7387garage/drivetrain /escrepl...

What is electronic spark control (ESC)?
Electronic Spark Control
An additional electronic control (ESC) is used on vehicles equipped with an LE9 engine. The Electronic Spark Control (ESC) system is a closed loop system that controls engine detonation by modifying the spark advance when detonation occurs. The amount of retard is a function of the degree of detonation.

Controller
The (ESC) controller processes the sensor signal and applies it to the distributor to adjust spark timing. The process is continuous so that the presence of detonation is monitored and controlled. The controller is a hard wired signal processor/amplifier which operates from 6 to 16 volts. The controller has no memory storage.

Sensor
The (ESC) sensor is a piezoelectric device, mounted in the engine block that detects the presence (or absence) and intensity of detonation by the vibration characteristics of the engine. The output is an electrical signal that goes to the controller. A sensor failure would allow no retard.

ESC Vacuum Switch
On LE9 engine equipped vehicles with automatic transmission a "tip in" vacuum switch is used. Its function is to provide a momentary contact closure (signal) to the ESC controller during a throttle "tip in" condition which then briefly retards spark timing to minimize knock. The switch contacts are normally open under steady engine vacuum conditions including no vacuum, and all brief increasing vacuum conditions. Basically the switch closes only during rapidly decreasing vacuum conditions such as that encountered on rapid throttle operation.



We need your help.
Please post symptoms of your ESC failure. Your info can help others.
Thanks!
'83 Silverardo XST - ZZ4 powered
'96 GMC Jimmy LS Ret. @236651 miles


 
Boog 
Super Senior Member
Posts: 3530
Boog
Loc: Central Arkansas
Reg: 04-28-02
12-09-07 05:29 AM - Post#1314345    
    In response to gchemist

My experience with the ESC was on my 85 K5 Blazer with 305/ OD tranny. All stock.
Occasionally when rounding a slow corner and stepping back into the throttle it would spark knock real hard and sometimes it would just die. And after spinning it over for a good bit it would start back up and run normal. After putting up with this for a while I learned from our GM dealer I could wire around the box and make it run which I did and ran it that way for 4 or 5 yrs. Downside of that was the 305 is sensitive to timing advance and I had to retard the timing and run a cooler thermostat to keep it from pinging and dieseling on shutdown. It was sluggish and sucked gas. I never liked the way it ran so I finally bought a reman'd ESC from GM. Was about $100 at the time. Put it all back like it was originally and it ran much much better.
Boog
69 Chevy step
06 GMC ccsb Z71
00 GMC excab Z71
All GM...'nuff said!
JR Nation


 
impalamark 
Contributor
Posts: 586
impalamark
Loc: Cocoa , Florida
Reg: 02-15-06
12-12-07 12:03 PM - Post#1316886    
    In response to Boog

I think this this is a great idea
my problem with my 86 was very simple
sometimes spark sometimes no spark
once it started you could drive and it would never fail when running but shut it off for one second
a it may not start for weeks then run again fine
for weeks again
I finally ripped it all out and put in a stand alone
hei system and had no more problems
wish I been a chevy talk member then !!
Mark
62 impala convertible owned since 1981- sold her
62 impala ss under constuction
1982 GMC Sierra
2001 tahoe


Edited by impalamark on 12-12-07 12:05 PM. Reason for edit: No reason given.

 
1983G20Van 
Super Senior Member
Posts: 3223

Loc: Bedford, Texas, USA
Reg: 11-13-02
12-12-07 09:28 PM - Post#1317307    
    In response to impalamark

  • impalamark Said:
I think this this is a great idea
my problem with my 86 was very simple
sometimes spark sometimes no spark
once it started you could drive and it would never fail when running but shut it off for one second
a it may not start for weeks then run again fine
for weeks again
I finally ripped it all out and put in a stand alone
hei system and had no more problems
wish I been a chevy talk member then !!
Mark




LOL, sounds like the problem I had with my 1983 G20. Never would die out while running, but would sometimes not start up. Hot or cold, no spark on restart. Coil, Module, Pickup Coil, nothing. Hotwire straight to the distributer, nothing. HUMM.

Ripped the whole carbed emissions nightmare and distributer setup off of it and dropped a MAF TPI setup on the engine. Was twice the engine after. No pinging, no hesitation, no bad gas mileage, just lots of tire spinning chevy 305 power.

http://youtube.com/watch?v=Oi_n0goatA8

http://youtube.com/watch?v=PX5Av4pS1RA
1983 G20 Van, 350 TPI, Ported 906 Vortecs, Edelbrock 3817 Base, ASM oversize runners. Reed Custom Roller cam, 700r4, 12 bolt with 3.08 gears, Doug Thorley Tri-Y headers, true duals


 
TDS-OF-MN 
Senior Member
Posts: 575

Loc: Minneapolis, MN USA
Reg: 07-09-01
12-21-07 12:52 PM - Post#1324044    
    In response to 1983G20Van

Yup, same symptom I had, the occasional no-start. Replaced several ignition components while trying to find the culprit.

Did the bypass (thanks to the site and the link explaining the task!) to get the truck running but have noticed the sluggishness and seemingly worse gas mileage since. Retained the orig distributor and all other components, but adjusted ignition timing to get the timing mark reding right Have since purchased a new ESC module, but have not re-connected the system yet.

When I think how close I was to dumping the truck at the height of this problem, ugh. Glad I stuck with it.
TomS.
'85 1/2ton 4x4 Pickup
305 w/ Quadrajet, 700R4, NP 208, 3.08 gears, Destination A/T's, rust
'98 Blazer 4x4, 4dr - stock

'70 Camaro-sold 10-4-08
'88 S-10 Blazer 4x4 (stolen 4-23-06 = recovered as total loss)


 
GcNetSpeed 
Newbie
Posts: 38
GcNetSpeed
Loc: CT, US of A
Reg: 03-21-08
03-23-08 08:37 AM - Post#1394575    
    In response to TDS-OF-MN

Hi I am new to the site so lets see if I could get this right!! I found a 86 C10 with 54,000 orig. miles, 262 4.3L V6 4bbl with electronic spark control (ESC) It has sat for 9 years in a bard I am doing work on it now. After getting it up and running from its sleeeeep! I found that it is burning alot of gas, did the usual fixes "tune_up" emissions etc. also went as far as replacing the carb. Still very bad gas mileage and lack of power.. I researched it and found that if the ESC system was bypassed that poor preformance and bad gas mileages was a result. My ESC in NOT BYPASSED, So My Queastion is if there is a failure in the system Re: Knock sensor, TIP-IN switch or ESC module could this cause these problems. Also knocking occurs intermitally on highway and regular roads when vechicle is NOT under any stress, does go away, truck runs very rich.. Thanks for any replies that might help!!

 
impalamark 
Contributor
Posts: 586
impalamark
Loc: Cocoa , Florida
Reg: 02-15-06
05-04-08 07:38 PM - Post#1426347    
    In response to GcNetSpeed

My purpose for having this posted
was not as a "fix"
as stated bypassing can cause other problems but
bypassing will get you home or around until
you can properly fix things
I spent almost a year fighting my 86 until
I figured it out it was intermittent and drove me nuts
Mark
62 impala convertible owned since 1981- sold her
62 impala ss under constuction
1982 GMC Sierra
2001 tahoe


 
popcorn89 
Contributor
Posts: 178

Reg: 12-22-10
05-16-11 07:05 PM - Post#2091040    
    In response to impalamark

1993 s10 was having esc problems and im not for sure th older truck have them but i was my knock sensor causing the problem that maybe it

 
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