Engine torque
After the engine in our '09 V10 6.8L F250 'sploded 3 days ago, we ended up with a new-to-us replacement '12 GMC 2500HD that we were able to find on very short notice. The V10 6.8L was rated 362HP w...
Forum Discussion
CharlesinGA wrote:myredracer wrote:
Changed the oil & filter yearly, had about 140K miles on it and it always ran great. The oil pressure was good right up to the end (unless that gauge was defective).
Understand that a Ford truck oil pressure gauge is not really indicating pressure. It is operated by a on/off pressure switch and has a resistor in the circuit on the back of the gauge to hold the gauge in the position you saw it in. If you think it fluctuated it was due to variances in system voltage. My '91 Ranger has the same thing, and it has been done this way since some time in the '70's or '80's right up to the present on all Ford trucks. You may have only had enough pressure to make the switch make contact (10 psi or so) and no more. Google Ford truck oil pressure gauge for more info, and ways to jumper the resistor and add a real pressure transmitter to the engine.
Charles
All the +/- does is shift up or down. So for instance. You come to a complete stop and you then shift it from D to M or manual. It will start in 1st and it will not shift to 2nd until you push the button up. Now, you can manually push it several times to pick a maximum high gear for instance 4th and it will shift normally until it gets to 4th and will stay in 4th until you put it back into D or manually pick a higher or lower gear.
