5.0 HO running in open loop

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5.0 HO running in open loop

March 07, 2007, 01:47:16 AM

My HO swap is complete--well almost. I have determined that my car is running in open loop ALL THE TIME. Once the engine has warmed up and running, I disconnect the MAF connector and it has no effect on the engine....it continues purring like a kitten. I've even gone as far as disconnecting the oxygen sensor harness while the car is running and also, no effect on the engine--the check engine light doesn't even come on for that.

I have checked for codes, and I get 67 and 95. Any ideas?:disappoin

5.0 HO running in open loop

Reply #1 – March 08, 2007, 12:58:50 AM

I believe 67 is a manual lever position sensor code and the 95 is a fuel pump circuit code.
These codes may be due to the pcm and harness you are using. http://www.fordfuelinjection.com can help describe it better.
Unplugging the mass air should cause some issues like a check engine light or running poorly. Make sure you have a good seal on your mass air especially upstream to the t.b. Also make shure you have vpower and ground at the connector. The signal wire to the pcm should be about .5-.7 volts.
Hope this helps,
Mike

5.0 HO running in open loop

Reply #2 – March 31, 2007, 02:28:29 AM

Thanks Mike. I haven't gotten a hold of a voltmeter yet to check the voltage, but air seal is good up to the throttle body. The car runs good (except for the open loop thing, of course) which I believe means that it's running a bit rich.