I have a 1990 F-350 with a 460 and I was just checking the MAP sensor
the way it says in a Haynes repair manual, and I was back probing the MAP B/P SIGNAL and it showed only about 2.2 volts, the manual says it should be about 5.0 volts. Is it time to replace the sensor? Has any one had experience in this matter.

Thanks

Ken

 

Ken, what makes you think that the MAP sensor is at fault? Do you have a "check engine" light on or did you or someone check for codes? They will usually set a code if they are at fault and I'm not sure how much you can trust that manual for your application unless it is very specific. Let us know what problem you are having?

 

I,m not having any problems with the truck other than getting 6.2 MPG. I use this truck only to pull my camper, so I was just checking it over because I don't need any problems while we are on the road. Maybe some background would help, I bought the truck in January, it was just a cab and chassis so I built a flat rack for it and now in the process of doing some things that have been over looked over the years. First of all, it has no O2 sensor on it, the exhaust has been changed, it now has a dual exhaust, I can't even find a place to plug the O2 sensor in. So even with out the senor the motor runs great, if it wasn't for the MPG, that's why I was checking the MAP sensor.

Mike, thanks for your time.

Ken

 

 

Hi Ken,

If you are pulling a camper and have a 460 engine you may only get that kind of mileage depending on your axle ratio too. If you are not having any running trouble I would not worry too much about the MAP sensor. Try to search out basic tune up parts like, wires,plugs, air filter,timing to get better mileage. Even taller tires can help you somewhat.

This may sound real stupid but make sure you dont have a fuel leak too,even a small one.

 

Mike:

Thanks again for all the advice, we just got back from a camping trip,and had the old Ford pull 160 miles at 65 mph and the motor seemed strong, mpg is still low but I can deal with that. The Ford is a big change from our other puller we had, a 1990 GMC 1/2 ton with a 350 engine and a small transmission.

Any way thanks again, and I'm sure I'll have more questions later.


Ken