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Old 01-31-2013, 03:59 PM
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Need help P 1670

Hey guys my truck has been acting up a while now. It's having a hard time cranking after seating awhile . And when it does it has a rough idle and no power till it gets up to operating temperature . Till it gets to that temp the injectors are very loud and it acts like it has a miss . I unplugged the icp to see what it did and the results we're noticeable . The idle was smooth and the miss seem to go away. Put code reader on it and pulled the following codes, p1280,p1670,p1247, and p0470. Cleared them and plugged the icp back in. I drove it for a couple of days and put the code reader back on and the following codes came up p1670 and p0470. So my question is how to diagnose the p1670 code and what would throw that code. The code says that the EF feedback signal not detected. Any help on this would be great.


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Old 01-31-2013, 06:37 PM
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Need help P 1670

Anybody with some suggestions?


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Old 02-01-2013, 06:17 AM
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Check the wires from the pcm to the idm - clean them - look for shorts, missing insulation, that kind of thing.

If the signal is not there, the only thing that carries that is the wiring from the idm to the pcm.
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Old 02-01-2013, 09:33 AM
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for 1670: Link
for the other code google guzzles page he has good info on how to clean the tube going to that sensor.
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Old 02-02-2013, 08:02 PM
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Need help P 1670

Thanks for the link and the advice. I'm going to do some investigating to see if I can find the wire. I hooked my truck up to my buddy's edge cts last night to check my icp . At idle it was between 426 and 505 jumping back and forth. And floored it was at 2800, so is this sound about right ? The ipr was around 11.7 at idle does this sound about right ? And with the p1670 code will the truck be hard to crank and run rough ?


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Old 02-04-2013, 02:40 PM
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Need help P 1670

So what do you guys think?


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