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code p0717 refers to turbine shaft speed (TSS) sensor--no signal===causes wiring--TSS sensor---ECM/TCM
code p1618 refers to transmission control module (TCM) MIL request==causes-- automatic transmission malfunction. I would say that you have 2 faults On is a turbine sensor that would account for the speed variation. As for the other have a pressure test done on the box to check for internal failures. Check for wiring to the TCM and see if the TCM can be tested .. Have an reputable auto transmission shop do the tests
Combining the hot cat converter and the missfire code, I would lean toward a fuel problem. Too lean or pressure too low. If it was an ignition problem the cat would usually not be hot. If the exhaust was stopped up, you would not usually get the multiple missfire issue. Just lack of power. It could be a leaking EGR or other vac problem, and a dirty fuel filter too.
When a GM engine light flashes it means your car is misfiring. This is a symptom of another problem. It could be loose spark plugs, a stopped up catalytic converter, etc. I would get it checked ASAP. If you wait too long you could damage your car. If your catalytic converter is stopped up your car is getting very hot EGT's (exhaust gas temps) and can mess up your motor. If it stops when you stop I would lean toward something simple though, but if you go to Advance Auto Parts, or Auto Zone they will scan the car for free. Let me know if you need anything else. Thanks.
one long flash and two short flashed means the ECM is working fine
check and see if the EGR valve is stuck closed when the engine gets hot
If stuck closed the EGR valve needs replacing for it supposed to open when hot
Pinpoint Test G: LFC 16/DTC B1925 - Passenger Air Bag Circuit Shorted to Battery or Ignition Normal Operation
The restraints control module (RCM) checks for passenger air bag module circuit shorts to battery or ignition by monitoring the voltage of circuits 607 (LB/OG) and 616 (PK/BK) at C310b, pins 6 and 7. If the RCM detects a short to battery or ignition on either of these pins, it will store a diagnostic trouble code (DTC) B1925 in memory and flash a lamp fault code (LFC) 16 (or higher priority code if one exists) on the air bag indicator. Possible Causes
A passenger air bag circuit short to battery or ignition can be caused by:
a short to battery or ignition on circuit 607 (LB/OG).
a short to battery or ignition on circuit 616 (PK/BK).
a short to battery or ignition on the passenger air bag module.
Unfortunately No, All of the Guages run straight into the Computer. If you bypass them you will have error codes out the Wazzu and lights on the Dash Constantly. Try a Salvage yard for a Replacement Guage Cluster.
take the upper radiator hose use a glove and while the car is running squeeze the hose together and see if trys to open in your hand and if it doesn't you have a weak water pump but check the condition of the drive belt and the coolant before you go to the pump