This is from the 1994 GM Factory Serive Manual, Book 2: IDLE AIR CONTROL (IAC) VALVE Remove or Disconnect 1. Electrical connector from IAC valve. 2. IAC valve assembly attaching screws. 3. IAC valve assembly. NOTICE: On IAC valves that have been in service: Do not push or pull on the IAC valve pintle. The […] More »

The IPC display, the 20-character, vacuum florescent screen above the steering column that says “Corvette by Chevrolet” every time you turn on the key is a powerful device. DIY Service Techs are going to be most interested in the LPG�s ability to show diagnostic trouble codes (DTC) for all the modules that transmit them.. The […] More »

I thought I\’d share a \”How-To\” regarding an LT1 to LT4 instrument cluster R&R Here\’s what we\’re doing… From this To this Tools you\’ll need: – Torque wrench (in/lb) – Torx bit set – Phillips head screw driver – 7, 10, 15mm sockets w/ratchet – 6\” ratchet extension Before doing the job, it would be […] More »

Best thing to do for no $$$ is to remove all the hoses/air tubes and the diverter box that go to the air pump and the exhaust manifolds, and all the associated brakets. You can cap off the manifold air tubes with 50 cent pipe caps from the hardware store. Removal of this alone will […] More »

You can make the LT1 \’92-\’94 Optispark setup more reliable than a �95-�96, even with the early distributor configuration. Buy a $12 \’96 GM Vette distributor vacuum harness assy. Buy a $4 clear plastic fuel filter. Buy a $3 tube of premium black Permatex RTV, because it withstands the highest temps. Reserve a long day […] More »

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 »

In front of the water pump pulley on 1988 and later L98s resides a rather large 10lb steel disk, lovingly refered to as the “frisbee”. There has been much debate on the Forum about it’s purpose and the benefits/risks of removing it. During a Q & A session at Corvettes at Carlisle 2001, I posed […] More »