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Car Forum / Oldsmobile Cars / January 20061997 olds achieva 2.4 engine
my car starts great, but when warm, on restart it will run about 2 seconds-then engine stops with all power still on.i would love a reason behind this Fuel Pump Electrical Circuit When the ignition key is first turned ON, without the engine running, the PCM energizes the fuel pump relay for a calibrated time (approximately 2 seconds). This builds up fuel pressure quickly. Whenever the engine is not started within two seconds, the PCM shuts OFF the fuel pump and waits until ignition reference pulses are present. As soon as the engine is cranked, the PCM energizes the fuel pump relay which powers the fuel pump. An inoperative fuel pump relay or an inoperative fuel pump would cause a no start condition. A fuel pump which does not provide enough pressure can result in poor performance. Crankshaft position (CKP) sensor activity (7X reference)--The CKP sensor generates a signal to the ICM which results in a reference pulse, square wave signal, being sent to the PCM. The PCM uses this signal to calculate crankshaft position, engine speed and injector pulse width. The engine will not start or run if this circuit is open or grounded. > my car starts great, but when warm, on restart it will run about 2 > seconds-then engine stops with all power still on.i would love a reason > behind this I UNDERSTAND "SILVER SURFER'S" EXPLANATION BUT HERE'S ANOTHER THING.IF IT DOES START RIGHT AWAY IT RUNS GREAT UNTIL THE NEXT EPISODE,THEN WHEN IT WON'T START,I HAVE TO TURN THE KEY ALL THE WAY ON FOR ABOUT 1/2HR.TILL THE PCM OR WHATEVER IT MAY BE RESETS AND SECURITY LIGHT STOPS BLINKING.AFTER 1/2HR. SHE RESTARTS AND RUNS GREAT FOR AWILE.ALSO THE DEALERSHIP REPLACED FOR THIS PROBLEM-INGNITION-IGN.SWITCH-COILS-PCM AND THE CLUSTER,THEY GAVE UP!! SO MUCH FOR PROFESSIONALISM-NOW TO ME THIS SHOULD HAVE CHALLENGE THEM.ANYONE THAT CAN SOLVE THIS I'LL BUY STOMPED IN MONTICELLO HELP- HELP-HELP My guess is that there is something wrong with your Class 2 serial data wiring. The description below is for a '98. Don't know if it's the same as a '97 or not. Document ID# 487983 1998 Oldsmobile Achieva -------------------------------------------------------------------------------- Vehicle Control Module Description The powertrain control module (PCM) communicates with the instrument cluster using serial data over the UART serial data bus, CKT 800. When the instrument cluster determines a Pass Theft condition, the instrument cluster sends a coded password to the PCM. When the instrument cluster receives the correct password, the PCM enables the fuel injection system in order to allow the vehicle to operate normally. The PCM may allow the vehicle to start and stall quickly during a failed theft condition. The PCM may enter the tamper mode under the following 2 conditions: A bad timing cycle An incorrect password If the instrument cluster does not send a password within a preset time window, the PCM will enter the Short Tamper Mode. During the Short Tamper Mode the PCM will not allow the car to operate for 4 seconds. If the password is incorrect, the PCM will enter the Long Tamper Mode. During the Long Tamper Mode the following actions will occur: The indicator will flash. The fuel injectors will shut off for approximately 10 minutes. The vehicle may start, but the engine will quickly stall due to fuel cut-off. The PCM will become fail-enabled under the following conditions: If there is a open in the serial data wire between the instrument cluster and the PCM If the vehicle is running The following actions will then occur: The THEFT SYSTEM indicator will illuminate continuously. The PCM will become fail-enabled for future ignition cycles. If a failure in the serial data wire occurs under the following conditions, the engine will not start: The engine is not running. The PCM is not fail-enabled. -------------------------------------------------------------------------------- Document ID# 487983 1998 Oldsmobile Achieva >I UNDERSTAND "SILVER SURFER'S" EXPLANATION BUT HERE'S ANOTHER THING.IF IT > DOES START RIGHT AWAY IT RUNS GREAT UNTIL THE NEXT EPISODE,THEN WHEN IT [quoted text clipped - 5 lines] > SHOULD HAVE CHALLENGE THEM.ANYONE THAT CAN SOLVE THIS I'LL BUY STOMPED IN > MONTICELLO HELP- HELP-HELP I,LL CHECK THIS OUT,THIS WILL HELP A GREAT DEAL IN MY QUEST TO ELIMINATE THIS PROBLEM.ANY OTHER SUGGESTIONS-I'M STILL CURIOUS IF THIS DON'T WORK,HOW CAN I BY PASS OR FOOL THE PCM?? THANKS-"SILVER SURFER" |
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