Running lean
08-06-2015, 03:13 PM
#1
Thread Starter
Join Date: Jul 2015
Location: louisiana
Posts: 8
Running lean
2000 gt mustang. I just rebuilt this motor for a friend. It was down for two months. The motor came out of a 2002 gt that I rebuilt. I rebuilt it stock, the only mods are a bbk 70mm throttle body and a CAI. The motor that came out of the 00 gt was to far gone to rebuild, but the throttle body and the CAI were on the car already before it blew up. Does it need a tune now. I'm thinking that it possibly had a tune before, but having the battery out for two months reset the computer. It is giving me codes p0171 and p0174
08-07-2015, 06:14 AM
#7
6th Gear Member
Join Date: Mar 2010
Location: Wisconsin
Posts: 5,061
Welcome, glad to have you.
Verify all vacuum lines are connected. Your symptoms point to unmetered air getting in and the computer can't adjust accordingly.
Also, these type of Tech questions should go in the Tech Section, just to keep the forum organized. Good luck
Verify all vacuum lines are connected. Your symptoms point to unmetered air getting in and the computer can't adjust accordingly.
Also, these type of Tech questions should go in the Tech Section, just to keep the forum organized. Good luck
08-14-2015, 04:50 PM
#10
Thread Starter
Join Date: Jul 2015
Location: louisiana
Posts: 8
I changed bank 2 sensor 1 o2 sensor and it got a lot better and I put the stock throttle body back on. Now it runs fine. The only time there is an issue is when at a stop and the brakes are applied it wants to stall out. If I'm stopped in gear with the parking brake on it idles fine the minute I press the brakes the idle drops out. So definitely thinking a vacuum leak but just cant find one. Any ideas would help.
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