Thread: 39 Ford (Coast to Coast) Rebuild

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If that's the O2 sensor for the EFI feedback that leak had to be playing hell with the EFI, trying to compensate for excess O2 in the exhaust when it was really coming in from the leak. Not a good deal, there.

Originally Posted by rspears

If that's the O2 sensor for the EFI feedback that leak had to be playing hell with the EFI, trying to compensate for excess O2 in the exhaust when it was really coming in from the leak. Not a good deal, there.

Yes it is and I'm betting yes it was. It has a really bad surge at idle and backfires during part throttle acceration. That usually points towards running lean, but if it saw excessive O2, you would think it would be loading up. I'm curious to see how it runs when I'm done.

Originally Posted by rspears

If that's the O2 sensor for the EFI feedback that leak had to be playing hell with the EFI, trying to compensate for excess O2 in the exhaust when it was really coming in from the leak. Not a good deal, there.

I'm going to lean the other way.. If the pressure was enough to blow out gaskets, I don't think O2 was getting in. I'm of the opinion that exhaust was constantly getting out! Not a good situation for the occupants for that vehicle! In any event, it's getting fixed properly now and we'll see what effect this has on engine operation. I'm also curious how close this sensor is from the back of the head? I've been reading some about these sensors and it seems some need to be closer than others ( I think..).

Thanks for the pics and the conversation.