Tag: C4

Plenum Studs

Recently I had to remove the air cleaner plenum for the first time. Unfortunately, when I tried to spin the plastic thumbscrews holding the plenum, they simply spun and did not release the plenum. Having never removed the plenum before I didn’t know how it was attached to the radiator shroud below it. I consulted […] More »

  Comments | By - April 21, 2010

Throttle Body Cleaning 101

Throttle Body maintenance 101: READ THESE INSTRUCTIONS ENTIRELY BEFORE STARTING THIS PROJECT! (YOU WILL NEED A DIGITAL MULTIMETER IF YOU TAKE THE TPS OFF! DON’T ATTEMPT TO REMOVE THE TPS IF YOU DON’T HAVE ONE, IT IS MANDATORY!) You should also buy the gasket kit from GM that includes the 4 gaskets and costs about […] More »

  Comments | By - April 21, 2010

1 to 4 Shift Lock-Out Relay

For those of you experiencing difficulty with the 1 to 4 shift lock-out, or for those of you who wish to experience shifting through all your six gears, here is a simple fix: on the passenger side, just in front of the fire wall, and mounted on the fender well, is a relay, that when […] More »

  Comments | By - April 21, 2010

C4 Exhaust Manifold Stud Removal and 3 Stud Bracket Fix

My 1985 Z-51 probably hadn\’t had the exhaust system out in 10 years. Needless to say, the exhaust header studs were rusted a bit and weakened by the years of heat. All the nuts came off except for one which snapped. The studs that were still there were bent – they seemed to be made […] More »

  Comments | By - April 21, 2010

Disable Light Sensor for Automatic Headlights

The credit for this tip really belongs to FrankD. I was getting annoyed with my headlights constantly flipping on and off on my c4 every time i drove through the shade. My car was originally a Canadian car, and had no way to shut this feature off. To disable the lights, carefully pull the light […] More »

  Comments | By - April 21, 2010

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