Question about 1994 Oldsmobile 88
I work a a Gm dealer and pretty good at what I do, But this one has me stumped as well as others in the shop. The car is an 89 Pontiac Grand Am 2.5 with TBI. heres what it came in for and where we are now. It came in with a no start. when you crank it and keeped the key in start it would run. if you let go it would die. after running some diag. we did notice that there was no pulse wisth after starting it, there would be spark but the pulse wisth would go away. after a day of diag. i unplugged the alternator and it continued to run. pulse width was back, if you put a shop charger on it, the same thing, it would loss pulse width, seams anything over a system voltage of 12.5 would kill the injector pulse. the ecm and prom where replaced. its not the injector driver, we have even used another know good ecm and got the same results. the ignition module as well as the crank sensor have been replaced as well. all engine ground and grounds the pcm are good and solid. all power have been verified as well. any help would be appriciated. I was told just to give it back to the customer, but i dont like to give up.
Hi, it sounds to me that you are losing contact at the ignigtion switch..C1...
Posted on Dec 02, 2008
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Fig. Crankshaft Position (CKP) sensor (7)
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The Crankshaft Position (CKP) Sensor is a permanent magnet output coil device that monitors the speed and position of the crankshaft. A reluctor is attached directly to the crankshaft, and is used to generate a constant signal as it passes the CKP sensor magnetic coil. The CKP Sensor utilizes system voltage (12 volts DC), or reference voltage (5 volts DC) to generate a digital output signal to the PCM that is based upon a 0.5 volt AC reference. The alternating magnetic field is used by the sensor output electronics to produce a digital pulse. The CKP sensor returns a digital ON/OFF signal pulse during each revolution of the crankshaft, with a momentary signal interrupt for the top dead center (TDC) position of the #1 cylinder. The Pulse Width Modulation pattern is used by the Powertrain Control Module (PCM) to calculate ignition timing, fuel injector timing, misfire diagnostics, and the tachometer display
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