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Bad misfire, codes PO340, 1336 and 1331

Tiny
DJ123
  • MEMBER
  • 2000 FORD WINDSTAR
  • 270,000 MILES
Driving down the road at 40 after leaving home about 15 minutes went to get on xway and sudden loss of power and bad misfire, sometimes stalls at light, poor rough acceleration. But cruise at 40 is not too bad. Got some codes po340, 1336 and 1331. Pulled 2 wire cam sensor parts undamaged look fine the in block part spins fine when running. Runs the same with or without the sensor! Don't have ac tester. Cheap Harbor Freight.
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Sunday, February 23rd, 2020 AT 1:42 PM

14 Replies

Tiny
ASEMASTER6371
  • MECHANIC
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Good afternoon.

did you reinstall the cam syncro and time it correctly?

the 2 codes are for the cam timing off. This is why I asked if you timed it correctly. There is a special tool for aligning the syncro.

Did you do a compression test on all the cylinders for the miss?

https://www.2carpros.com/articles/how-to-test-engine-compression

Roy

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Sunday, February 23rd, 2020 AT 2:44 PM
Tiny
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The parts involved are original to purchase 3 years ago. Previous to that I don't know. Okay, so I was checking harness and found the 2 wires to CS were badly frayed. Don't know why! I repaired them and now when I try to start car it kicks back! Like timing too advanced.
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Sunday, February 23rd, 2020 AT 4:53 PM
Tiny
ASEMASTER6371
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Crank or cam sensor?

Roy
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Sunday, February 23rd, 2020 AT 5:50 PM
Tiny
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Cam sensor. Also I have cheapy Bluetooth gadget for engine performance with cam sensor. Prior to wire issue find timing was showing 12 at idle and 29 when I revved it.
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Sunday, February 23rd, 2020 AT 6:24 PM
Tiny
ASEMASTER6371
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The cam synchro timing is off causing the code and the hard start.

Roy
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Sunday, February 23rd, 2020 AT 7:12 PM
Tiny
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If so how did it happen? Car was fine 1 minute then just started running bad!
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Sunday, February 23rd, 2020 AT 8:10 PM
Tiny
DJ123
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What about the timing chain jumping that thought crossed my mind?
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Sunday, February 23rd, 2020 AT 8:26 PM
Tiny
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Looking at chain diagrams I don't see how unless some teeth broke?
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Sunday, February 23rd, 2020 AT 8:30 PM
Tiny
DJ123
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My wife mentioned it would run rough in the morning for a few minutes then smooth out. Not as rough as it is now.
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Sunday, February 23rd, 2020 AT 8:32 PM
Tiny
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Can't understand the logic behind the answers it's lacking?
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Monday, February 24th, 2020 AT 11:21 AM
Tiny
ASEMASTER6371
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You removed the syncro as you stated way back. After that, you set the codes for the cam timing from the syncro set wrong.

I told you that you need to reset the cam timing as it will cause a hard start and erratic engine operation.

The timing chain can be confirmed by checking the compression or using a vacuum gauge to check the engine vacuum.

Roy
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Monday, February 24th, 2020 AT 6:23 PM
Tiny
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Okay, I did not remove/move syncro just sensor! So I don't see how synchro could be off unless chain is jumped? And internet says possible bent valves?
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Tuesday, February 25th, 2020 AT 8:46 AM
Tiny
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I had a Chevrolet v6 that ran sorta like this one and the ignition module was bad!
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Tuesday, February 25th, 2020 AT 8:47 AM
Tiny
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No to the bent valves. The engine would run with a misfire 100% of the time.

With the 2 codes, you listed, it is pointing right at the syncro. You could have a bad syncro assembly.

You need to resolve those codes first with either setting the timing or replacing the syncro. It will cause the hard start and the misfire.

Roy
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Tuesday, February 25th, 2020 AT 10:24 AM

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