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2005 cranks but no start p0350

bigboy9295

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A friend has a 2005 Lincoln Town Car Signature and one night after parking it, it would not start the next day. It drove fine the previous day with no issues. The was a CEL and pulling the code it was a P0350 and the car is running rich. It cranks but will not turn over. We got it to start a couple of times by starting the car in flood mode (pedal all the way to the floor before turning the key and starting the vehicle) but it was misfiring badly. Here is what we have done so far and any help/advice would be appreciated. Replaced the electronic IAC, plugs, coil packs, fuel filter, crank and camshaft position sensors, and throttle position sensor. Also cleaned the throttle body, plenum, and MAF. You can hear the fuel pump prime and the throttle body sweeping when you turn the key to the on position.
 
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YoungOldMan

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This is a really dumb question, considering everything you've replaced, but have you checked to make sure the plugs are gapped correctly and are actually getting spark? It doesn't look like you've replaced the spark plug wires, so if you've got bum wires then you may not be getting spark at the plug.

Have you checked the air filter to make sure it's clean? I'm pretty sure the '05 came with the K&N million-mile filter and I know people sometimes don't realize those need to be cleaned and oiled periodically.
 
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This is a really dumb question, considering everything you've replaced, but have you checked to make sure the plugs are gapped correctly and are actually getting spark? It doesn't look like you've replaced the spark plug wires, ...
Plug gap, maybe. The 2005s, like several model years older and up today, use coil packs, which bigboy9295's friend already replaced. These are individual coils installed directly to each plug, so there are no high tension wires in the system to go bad.

The P0350 OBD code pertains to ignition far more than fuel, so everything ignitionwise between the plug gap and the PCM needs to be checked for faults, and repaired or replaced as needed. At least one repair information web site lists the PCM itself as a possible culprit. More likely is damage to the coil wiring on the "car" side of the coil packs, since anything on the coil packs themselves was replaced with the coil packs.

Or, they might have set the gap wrong, bought "pre-gapped" plugs with the wrong gap or collapsed gap from rough handling in transit, etc.

Good luck.
 

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