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Posts Tagged: Cadillac

4.5 V-8 VIN 3 Cadillac firing order

4.5 liter, V-8, VIN 3, Cadillac, firing order, spark plug gap, spark plug torque, with distributor   © 2012 Rick Muscoplat  

Engine Overheats – GM vehicles

Engine Overheats No radiator fans on GM vehicles, Chevrolet, Impala, Pontiac, Buick, Cadillac GM uses a pretty nifty technique to control the radiator fans on late model vehicles. The system consists of two fans and three relays. When the powertrain control module (PCM) detects the need for cooling from the engine coolant temperature sensor (ECT) at 223 degrees or refrigerant pressure above 190-psi., it provides a ground signal to the low speed fan relay. Power flows to one fan, and the ground for that fan flows to the second fan. … Read More

no start no crank no click – GM

How to diagnose a no start no click on GM vehicle. If you have a late model GM vehicle and turn the key only to hear nothing, you’ll most likely think you have a dead battery—and you may. But a no start, no crank, no click condition can be far more involved than that. In the old days, power flowed through the ignition switch and down to the starter solenoid. Not anymore. The ignition switch now talks to the body control module (BCM) and it’s the BCM that initiates one of … Read More

Passlock III reset procedure

How to do a Passlock III reset This is one in a series of articles. READ THIS FIRST GM made several different types of anti-theft systems. VATS, PassKey, and PassLock. The troubleshoot and reset procedures are different for each. PassLock seems to have the highest failure rate. So if you have a key WITHOUT a chip in it, chances are it’s a PassLock system. This article describes how to troublshoot and fix a PassLock system. But here are some more articles to help Click here to see the resetting procedure … Read More

Passlock reset procedure

How to perform a PassLock Reset This is one in a series of articles. READ THIS FIRST GM made several different types of anti-theft systems. VATS, PassKey, and PassLock. The troubleshoot and reset procedures are different for each. PassLock seems to have the highest failure rate. So if you have a key WITHOUT a chip in it, chances are it’s a PassLock system. This article describes how to troublshoot and fix a PassLock system. But here are some more articles to help Click here to see the resetting procedure for … Read More

Passkey II reset procedure

This is one in a series of articles. READ THIS FIRST GM made several different types of anti-theft systems. VATS, PassKey, and PassLock. The troubleshoot and reset procedures are different for each. PassLock seems to have the highest failure rate. So if you have a key WITHOUT a chip in it, chances are it’s a PassLock system. This article describes how to troublshoot and fix a PassLock system. But here are some more articles to help Click here to see the resetting procedure for PassLock Click here to see the … Read More

GM PassKey and PassLock overview

Diagnose problems with anti-theft systems in GM vehicles Read More

P0446

Fix Trouble code P0446 on GM vehicles GM has issued a TSB (#04-06-0055) for code P0446 on 2000-03 Cadillac, Chevrolet and GMC full size utility trucks. The charcoal canister stores gasoline vapors from the tank. When certain driving conditions are met, the computer supplies power to the purge and vent solenoids. The purge solenoid opens the vacuum line between the canister and the intake manifold and engine vacuum sucks the vapors out of the charcoal. The vent solenoid opens a fresh air line into the canister. If these vehicles are … Read More


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