Tripod said:
Thanks for the previous informaiton guys...I'm going to look for a 5.0 with the GT40p and run the Mustang Fuel Injection (MAF), wiring harness, and computer (among other items mentioned in previous posts). I've found low mileage 1999 and 2000 Mercury Mountaineers at reasonable prices.
Question: Is there a difference between the 5.0 in an Explorer versus a Mountaineer (1999 or 2000)?
More help please!!!
The explorer/mountainer motors are the same when comparing same year vehicle.
Most of the differences are based on year of production, not on vehicle application.
intro to mid '96- motors had gt40 heads and internal egr passages
mid '96 to end of production- motors had gt40ps and external egr passages.
There was also a change in the throttle body position in relation to the way the throttle lever is actuated by the throttle cable- I am not sure what year this happened, but I suspect when the change to gt40ps occured.
To determine if the motor has an external egr, look for a metal corrogated tube running to the throttle body (not sure where it originates). Internal egr will not have the tube, just the egr valve mounted to the TB adapter.
One other thing, the gt40ps use specific headers due to the angle of the spark plug. The plug angle is almost 90 degrees in relation to the head, while the gt40s have a plug angle more like 45 degrees. Most new aftermarket headers will work with the p's, just check the application. I believe ford motorsport sells ceramic coated headers that will work with the p's.
I highly suggest investing in the trick flow gt40 valve spring upgrade kit. It costs about $100 from summit and will upgrade the stock weak ass springs. The stock springs do not handle rpms at all and will float. Install a mustang cam, and upgrade to 1.7 roller rockers and you will get an easy 300 hp motor. While in there changing the cam, might as well replace the timing set too. You will need a mustang distributor, but it drops right in place of the explorer cps. If you stay with the explorer fuel rails, you may have some slight clearance issues with the mustang distributor body and D/S fuel rail- I think I just clocked mine over a little and there is enough room to set the timing just fine- 10 degrees btdc with the spout connector out. Just remember to plug the spout back in when finished.