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Reoccuring P0271

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07 E-350 (econoline's blow)

Came in with MIL on and a P0271. Pinpoint test "P" led me to a faulty injector, after getting to like P5 it sent me back to P2 and the injector itself failed the resistance test. Replaced the injector, MIL and P0271 came back. Contacted the hotline, they told me to do some black majic before condeming the FICM, came up with a FICM after their diag. Replaced FICM, MIL and P0271 came back. I know the wiring is good because I made sure to check and double check the wiring when I had the injector out and the connectors were easy to get to.

 

Any ideas guys,

 

Thanks in advance,

 

Brandon

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Will it set the fault during buzz test? If so, swap harnesses to a neighbor injector or connect a known good injector and re-run the buzz test. If not, connect an overlay harness on the injector pins and re-test.

 

The only real way to test the wiring is to load the circuits to about 15 amps/12v and check voltage drop. This won't be easy or quick.

 

It sounds like you may have a bad harness.

 

Posted Image

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  • 4 weeks later...

Finally got around to putting this harness in. What all do I have to pull to get the connectors that come down in front of the engine? Looks like one goes to the AC and one to the P/S pump, do I need to pull the compressor and pump to get to them?

 

This is my first harness job, it dont seem tooooooo bad.

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I haven't done one, but I remember guys here saying they de-pin the connectors on the new harness, cut the old harness, tape the old wires to the new harness terminals, and feed it through that way. This eliminates removal of the components. The CKP wiring seems to come to mind....

 

I'm sure someone else will chime in.

 

 

 

 

Posted Image

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OOOOH! I'LL CHIME! Posted Image

 

I just did one in a bus and used the tips we discussed. There really is no way to easily do the CKP because it is routed behind the pulleys and tensioner - properly secured it clips onto the engine block - you will at the very least need to unbolt the A/C compressor and let it sit on the cross member to do the CKP take out.

 

As Bruce stated here you can have an easier go at the CMP sensor by carefully removing the pins from the connector and tape them to the old harness cut the harness for the CMP sensor as close to the main loom near the fuel filter housing. When you disconnect the sensor just gently pull the old harness out and then put the connector back on the new harness.

 

Pay close attention to the wire colors and pin numbers. I was trying to be careful and still reversed them. Posted Image No big deal, at least on an Econoline there is room to work in that area.

 

Good Luck!

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