NO SPARK condition cured 84 silverado 305-LE9 (vin H) - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Ishtim · 06-29-2003, 02:13 PM

With help from a another Forum user, we determined that the ESC box caused fault in ignition system. Fix: all new electronic distributor components (even though all were within tolerance except low resistance on pick up coil) and jumper the green and black wires of the 4 prong ESC module plug (at the distributor). It seems that the failure in the "sparkbox" disallows one of the transistors in the IGN module not to complete the circuit required for high voltage generation and... NO SPARK .

This was very confusing seeing that all components tested out to be within tolerance and the module tested out fine.

*1FaastC10* · 06-29-2003, 02:47 PM

hmmm.... i'm having a no spark problem with my 86. im going to try a non-esc distributor and see if that fixes it.

82 Silverado 4X · 06-29-2003, 03:44 PM

The only thing left to my ESC system is the letters on the tailgate. Works great.

Ishtim · 06-29-2003, 07:12 PM

I don't mean to sound like an expert on this but, try jumpering the green & black wires on the ESC plug at the distributor
if all else fails (i.e. all other components are good)!

Mike76251 · 06-30-2003, 07:04 AM

This may help,

Ishtim · 06-30-2003, 09:19 AM

That's it Mike76251:

Bofore you cut these try a jumper to see if that's gonna do it.

Again I'd like to thank forum member:
TC70C10

Except now I'm outta beer!

Mike76251 · 06-30-2003, 03:22 PM

Quote:

Originally posted by Ishtim
That's it Mike76251:

Bofore you cut these try a jumper to see if that's gonna do it.

Again I'd like to thank forum member:
TC70C10

Except now I'm outta beer!

What......outta beer at 8:19am on a Monday morning??
That musta' been a heck of a party Sunday night if it lasted that long!

Ishtim · 07-02-2003, 08:44 AM

Now that I'm running again it seems the factory timing setting is no longer valid. Without the knock sensor what should I run the timing at? (Was 4deg BTDC @ 500RPM).

gldevall · 07-02-2003, 11:02 AM

I have done the same mod to my truck. My question is since teh ESCC is no longer used, can it along with all of the wires to it be removed?

TC70C10 · 07-03-2003, 01:24 PM

I don't see why not.. I've got all my wires unplugged and no knock sensor.
I just haven't crawled up under the dash yet and started pulling wire.

**swervin ervin** · 07-03-2003, 03:33 PM

Yep, the rest of the not used crap can be removed. You'll need to plug the hole in the firewall after removing the harness. The knock sensor is where normally you would have a plug to drain the block of coolant. If you remove the knock sensor, get a pipe plug to go back in the hole. Also, be prepared to get wet.

apstguy · 07-04-2003, 05:28 AM

Do you know if the emissions controlled trucks have different computers than the ESC only trucks? I have an oxygen sensor and an "electronic" carb - is it controlled by the ESC computer???

**swervin ervin** · 07-04-2003, 09:18 AM

Yes, emission controlled trucks have different computers. The ESC (electronic spark control) only controlls spark knock. If your truck is computer controlled, it has a ECM (electronic control module). One of the functions of the module is to control timing too. But it also controls fuel.

06-29-2003, 02:13 PM	#1
Ishtim Registered User Join Date: May 2003 Location: Looking out the window at my truck! Posts: 8	NO SPARK condition cured 84 silverado 305-LE9 (vin H) With help from a another Forum user, we determined that the ESC box caused fault in ignition system. Fix: all new electronic distributor components (even though all were within tolerance except low resistance on pick up coil) and jumper the green and black wires of the 4 prong ESC module plug (at the distributor). It seems that the failure in the "sparkbox" disallows one of the transistors in the IGN module not to complete the circuit required for high voltage generation and... NO SPARK . This was very confusing seeing that all components tested out to be within tolerance and the module tested out fine. __________________ 1984 K10 - 305 CID - 4bbl

06-29-2003, 03:44 PM	#3
82 Silverado 4X Genuine Chevrolet Join Date: Feb 2003 Location: South West Pennsylvania. Posts: 582	The only thing left to my ESC system is the letters on the tailgate. Works great. __________________ George 82 Silverado LWB 4x4 350 SM465 NP208 77 Chevrolet Blazer Chalet 400 TH350 NP203

06-29-2003, 07:12 PM	#4
Ishtim Registered User Join Date: May 2003 Location: Looking out the window at my truck! Posts: 8	I don't mean to sound like an expert on this but, try jumpering the green & black wires on the ESC plug at the distributor if all else fails (i.e. all other components are good)! __________________ 1984 K10 - 305 CID - 4bbl

06-30-2003, 07:04 AM	#5
Mike76251 Senior Member Join Date: Mar 2003 Posts: 2,499	This may help, Attached Images

06-30-2003, 09:19 AM	#6
Ishtim Registered User Join Date: May 2003 Location: Looking out the window at my truck! Posts: 8	That's it Mike76251: Bofore you cut these try a jumper to see if that's gonna do it. Again I'd like to thank forum member: TC70C10 Except now I'm outta beer! __________________ 1984 K10 - 305 CID - 4bbl

06-29-2003, 02:47 PM	#2
1FaastC10 Account Suspended Join Date: Oct 2002 Location: Elkhart, IN Posts: 6,399	hmmm.... i'm having a no spark problem with my 86. im going to try a non-esc distributor and see if that fixes it.

07-02-2003, 08:44 AM	#8
Ishtim Registered User Join Date: May 2003 Location: Looking out the window at my truck! Posts: 8	Now that I'm running again it seems the factory timing setting is no longer valid. Without the knock sensor what should I run the timing at? (Was 4deg BTDC @ 500RPM). __________________ 1984 K10 - 305 CID - 4bbl

07-02-2003, 11:02 AM	#9
gldevall Registered User Join Date: Mar 2003 Location: Walker, LA Posts: 2,925	I have done the same mod to my truck. My question is since teh ESCC is no longer used, can it along with all of the wires to it be removed? __________________ Gary -1986 SWB: lowered 4/6, SOLD!!! -Best 1/4 mile: 14.51 @ 91.01 MPH -2001 Pewter Tahoe, billet grill, Corsa Sport Cat-back, K&N FIPK SOLD!!! -2004 Z-71 Extended cab with a flowmaster, BDS 6.5", 3" BL, 35x12.5x18 Trail Grapplers on Pro-Comp 18x9 wheels

07-03-2003, 01:24 PM	#10
TC70C10 Registered User Join Date: Nov 2001 Location: Harvest, AL 35749 Posts: 337	I don't see why not.. I've got all my wires unplugged and no knock sensor. I just haven't crawled up under the dash yet and started pulling wire. __________________ 1981 K5 Blazer 305, 4spd, 4x4, 4" Lift, custom bumpers, Warn 9.5 Ti Winch 1995 T10 Blazer 4.3L 4x4 (Son's) 2004 GMC Envoy 4.2L 2WD 2005 GMC Sierra Crew Cab Z71 4x4 5.3L 240 Fun Finder Travel Trailer Harvest, AL 35749

07-03-2003, 03:33 PM	#11
swervin ervin You get what you pay for Join Date: Dec 1999 Location: Cherryville, NC Posts: 4,798	Yep, the rest of the not used crap can be removed. You'll need to plug the hole in the firewall after removing the harness. The knock sensor is where normally you would have a plug to drain the block of coolant. If you remove the knock sensor, get a pipe plug to go back in the hole. Also, be prepared to get wet. __________________ Mike 1985 Chevy C-10

07-04-2003, 05:28 AM	#12
apstguy LED King Join Date: Jan 2003 Location: Sacramento, CA Posts: 2,087	Do you know if the emissions controlled trucks have different computers than the ESC only trucks? I have an oxygen sensor and an "electronic" carb - is it controlled by the ESC computer??? __________________ Tyler 1985 C10 305 w/ Bowtie OD TH700R4 3.42 LSD 202,000 miles 2006 Ford Focus ZX3 5-speed Stick 2016 Chevy Spark EV Gone: 2002.5 VW GTI 24v VR6 Gone: 2008 VW R32

07-04-2003, 09:18 AM	#13
swervin ervin You get what you pay for Join Date: Dec 1999 Location: Cherryville, NC Posts: 4,798	Yes, emission controlled trucks have different computers. The ESC (electronic spark control) only controlls spark knock. If your truck is computer controlled, it has a ECM (electronic control module). One of the functions of the module is to control timing too. But it also controls fuel. __________________ Mike 1985 Chevy C-10

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