CLASS RACER FORUM - View Single Post

Bob Mulry · 01-27-2016, 02:07 PM

Hi,

I worked at a Cadillac Dealership and had to work on the HT4100 engines. The tune up guys would send the cars to heavy duty to have the trans diagnosed for no full throttle upshift. We would run a can of TEC through the engine to remove the varnish from the valve stems to prevent them from sticking. Re-road test and the trans was fixed.

The varnish caused the engine RPM to flatten out and not reach the RPM needed by the governor to do a full throttle upshift.

We pulled out a lot hair on that one.

Bob

01-27-2016, 02:07 PM	#5
Bob Mulry VIP Member Join Date: Apr 2002 Location: Coarsegold, CA Posts: 1,016 Likes: 57 Liked 320 Times in 102 Posts	Re: Lapping piston rings Hi, I worked at a Cadillac Dealership and had to work on the HT4100 engines. The tune up guys would send the cars to heavy duty to have the trans diagnosed for no full throttle upshift. We would run a can of TEC through the engine to remove the varnish from the valve stems to prevent them from sticking. Re-road test and the trans was fixed. The varnish caused the engine RPM to flatten out and not reach the RPM needed by the governor to do a full throttle upshift. We pulled out a lot hair on that one. Bob __________________ Bob Mulry 7516 STK A & M Motorsports