Question about 1997 Ford Crown Victoria

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1997 ford crown victoria starting problems

I have a 1997 Crown Viic I start it up and it runs great. I shut it off and it will start right back up. If I let it sit for 20- 45 minutes it has difficulty starting. What do you think the deal is ?

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Sounds like you're on the right track. A bad TPS and ISC motor sensor will cause the problems you're experiencing. Your ECM relies on the readings it gets from the TPS to be sure there is enough air getting to the engine. If the ECM gets a bad reading and thinks not enough air is getting to the engine, it will cut the fuel supply, hence causing your engine to die. Your ISC relies on the reading from the TPS as well. It detects from the ECM if the throttle plate is closed or not. If it thinks the throttle plate is fully closed, it will start allowing air to enter the engine and bypass the throttle plate. If your ECM starts seeing some unmeasured air coming from ISC and detects the throttle plate is open (which it may not be due to a bad TPS reading), the ECM will again cut the fuel supply to avoid the risk of detonation.

So, replace your TPS first and see if that cures your problem. Also, check the resistence readings of your ISC to be sure that is within spec. If your problem still occurs, check your Intake Air Temperature (IAT) sensor in your air filter housing. Be sure your spark plugs, plug wires, and distributor are all in good shape as well. Replace your fuel filter if you haven't done so in the past 2-3 years.
Good luck!

Posted on Jun 23, 2008

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