The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - troubleshooting code 24 (VSS) on a 1987 R10 Chevy Suburban 350 TBI

Jonboy · 09-14-2010, 10:59 AM

Randy is pretty right. That is the VSS buffer; it emits a light that is broken by a black spot on the back of teh speedometer head, and counts the pulses. You really need the speedometer cable hooked up, VSS will affect idle, canister purge, TCC lockup, and can damage the trans (TCC slippage) and make the engine and trans run hotter as well.

09-14-2010, 10:59 AM	#3
Jonboy Slots go on anything! Join Date: May 2003 Location: Richardson, TX Posts: 5,957	Re: troubleshooting code 24 (VSS) on a 1987 R10 Chevy Suburban 350 TBI Randy is pretty right. That is the VSS buffer; it emits a light that is broken by a black spot on the back of teh speedometer head, and counts the pulses. You really need the speedometer cable hooked up, VSS will affect idle, canister purge, TCC lockup, and can damage the trans (TCC slippage) and make the engine and trans run hotter as well. __________________ 1974 Jimmy- 5.3/4L80e/NP241