'86 Blazer 305-H problems Please Help! - The 1947 - Present Chevrolet & GMC Truck Message Board Network

AceFaraday · 05-05-2003, 11:49 PM

I have a '86 K5 Blazer. supposedly, that was the year that they experimented with emissions control. i have a box above my glovebox that seems to be like an ECU, but it's supposed to be "emissions Control" first, i have heard that you can bypass this box by crossing wires, but i dont know which ones to cross. second, i would like to find out a gm part number or somewhere where i can buy a new one. any info you may have on this control box would e extremely appreciated and helpful. Thank You

CRRoy71 · 05-06-2003, 12:04 AM

Read this, that box should be the controller for the ESC.
http://www.73-87.com/garage/escrepl.htm

Prerunner1982 · 05-06-2003, 01:43 AM

my 82 has the ESC box. and mikes page (the one linked above) can help you with the elimination of this box.

Mike76251 · 05-06-2003, 07:50 AM

ESC mod,

TC70C10 · 05-06-2003, 12:53 PM

Is the ESC sensor located on the right side (pass)? I busted a sensor when I pulled my 305 with bad compression and replaced with Autozone rebuilt. I checked on this particular sensor and they wanted about 100 bucks for it. They told me it had something to do with the Cam and it would kill the engine if the cam went bad.

Maybe this is why I hear a low clack at low rpm's in 2nd and 3rd gear on slight incline/hill.

Tim

05-05-2003, 11:49 PM	#1
AceFaraday Registered User Join Date: May 2003 Posts: 3	'86 Blazer 305-H problems Please Help! I have a '86 K5 Blazer. supposedly, that was the year that they experimented with emissions control. i have a box above my glovebox that seems to be like an ECU, but it's supposed to be "emissions Control" first, i have heard that you can bypass this box by crossing wires, but i dont know which ones to cross. second, i would like to find out a gm part number or somewhere where i can buy a new one. any info you may have on this control box would e extremely appreciated and helpful. Thank You

05-06-2003, 12:04 AM	#2
CRRoy71 Registered User Join Date: Feb 2003 Location: Mont Belvieu, TX Posts: 852	Read this, that box should be the controller for the ESC. http://www.73-87.com/garage/escrepl.htm __________________ Chris '92 ext. cab s/b 4.3L "Sparky" '04 crew cab 2500 4x4 6.0L

05-06-2003, 01:43 AM	#3
Prerunner1982 Registered User Join Date: Oct 2002 Location: Edmond, OK Posts: 5,906	my 82 has the ESC box. and mikes page (the one linked above) can help you with the elimination of this box. __________________ Jon 1982 Chevy Silverado 350/th350.... RETIRED 1993 Jeep XJ 2 door(Cherokee) 4wd 4.0ltr/AX-15 (5spd)/NP231 .... Oklahoma Roll Call

05-06-2003, 07:50 AM	#4
Mike76251 Senior Member Join Date: Mar 2003 Posts: 2,500	ESC mod, Attached Images

05-06-2003, 12:53 PM	#5
TC70C10 Registered User Join Date: Nov 2001 Location: Harvest, AL 35749 Posts: 337	Is the ESC sensor located on the right side (pass)? I busted a sensor when I pulled my 305 with bad compression and replaced with Autozone rebuilt. I checked on this particular sensor and they wanted about 100 bucks for it. They told me it had something to do with the Cam and it would kill the engine if the cam went bad. Maybe this is why I hear a low clack at low rpm's in 2nd and 3rd gear on slight incline/hill. Tim __________________ 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



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