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Reload this Page Van is running crappy, got trouble codes PO302 and PO316

Ford Freestar The Ford Freestar is a solid, highly capable minivan that performs well and offers all the latest safety features. Much of the Freestar's structure and design came from the Windstar it replaced. Windstar offered class-leading safety and solid performance for its time. Freestar is the highest quality minivan it has ever built.

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Old 05-29-2009, 01:57 PM   #1 (permalink)
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Default Van is running crappy, got trouble codes PO302 and PO316
A girl I work with has a 2004 Freestar that has been running poorly lately. It hesitates and a lot of times it feels like it's about to stall when she's driving. The engine light has also been on. She had a friend put new plugs and wires in it but that doesn't seem to change things. She took it to AutoZone to get scanned and it came back with trouble codes PO302 and PO316. From what I can find, it looks like PO302 has to do with cylinder #2 misfiring and PO316 sounds like it means a misfire within first 1000 rpm of startup, whatever that means exactly. She's a single mom without a lot of $$$ to blow on fixing her car (or a lot of time to spend on it, either) so I'm trying to find out what the best route would be to take, besides just running it in to the stealership.

Any ideas on which way to go next, if the plugs and wires have already been replaced? Thanks!
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Old 05-29-2009, 02:00 PM   #2 (permalink)
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maybe the dizzy
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Old 05-29-2009, 02:50 PM   #3 (permalink)
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What's the "dizzy"?
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Old 05-29-2009, 02:55 PM   #4 (permalink)
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No dizzy on that vehicle. A dizzy is a distributor cap or distributor.

Your vehicle sounds like it has a bad coil if the plugs and wires were replaced.
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Old 05-29-2009, 05:48 PM   #5 (permalink)
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If it is the coil, any idea as to what it should cost to fix? Thanks!
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Old 05-29-2009, 07:38 PM   #6 (permalink)
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You can test the coil
WIndstar coil pack ... how to test
http://www.ford-forums.com/ford-wind...afe-drive.html

also check your connections to the camshaft position sensor and the crankshaft position sensor. One of them (I don't know which) is responsible for letting the PCM know when the number 1 cyl is TDC so it can set the timing on start up. That may be the cause of the first 1000 revolutions code.

EDIT: IT was driving me nuts that I couldn't remember why each was important at start up, so I looked it up. They are BOTH important at start up.
Camshaft Position sensor CMP VS Crankshaft Position sensor
CMP supplies camshaft position information to the PCM. The PCM uses this information during engine startup to begin sequential pulsing of fuel injectors.

Crankshaft Position sensor CKP provides crankshaft position and engine RPM information to Ignition Control Module. (Setting spark timing info)
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Last edited by BroncoJoe19; 06-01-2009 at 02:36 PM.. Reason: CMP vs CKP info added
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Old 05-30-2009, 12:26 AM   #7 (permalink)
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Where are the two sensors located?
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Old 05-30-2009, 03:18 AM   #8 (permalink)
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Default 3.8 L Engine controls location diagram
See if this diagram helps locate the CPS and CPK
38LEngineControlsDiagram.JPG
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Old 05-30-2009, 03:52 PM   #9 (permalink)
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Any idea of what it might cost to get the coil replaced?
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Old 05-30-2009, 06:05 PM   #10 (permalink)
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I guess that it would be an hour of labor, and double the price of whatever you can buy one for at Auto Parts Fast at RockAuto
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