Question 2007 E450 V-10 loss of power

[Kevin D Pem]

Have you put a Guage on fuel pressure?

Regulator, fuel pump???

 

[Olddawg]

Keep looking! I think it's not that sensor! Why? Because throttle sensors typically have a dead spot, and when past that location resume proper operations!

You were right not throttle position sensor…still at a quandary?

 

[Olddawg]

Have you put a Guage on fuel pressure?

Regulator, fuel pump???

I checked fuel pressure and pump all good Initally I replaced fuel and filter no codes.never got hot.air intake all clear new filter, doesn’t run bad starts everytime

 

[Olddawg]

I bought a truck that had your problem. I bet on the throttle position sensor as well. Turned out to be the MAF sensor! What confuses me is no codes.

I would love to take it to dealer and have them diagnose it, but I live in Bay Area they don’t let and motorhomes in for repairs

 

[Kevin D Pem]

A MAF can be a problem. Same as an air leak. Skipped timing chain would give a crank position error. Ignition would give a miss code. O2 sensor should give code with leaks and MAF, but those two are where I'm leaning. MAF is not that expensive, I would replace and do another test drive. Quality of gas may be an issue as well.

 

[Olddawg]

A MAF can be a problem. Same as an air leak. Skipped timing chain would give a crank position error. Ignition would give a miss code. O2 sensor should give code with leaks and MAF, but those two are where I'm leaning. MAF is not that expensive, I would replace and do another test drive. Quality of gas may be an issue as well.

Not a skipped chain if as MAF orO-2 sensor it would code

 

[Kevin D Pem]

Not a skipped chain if as MAF orO-2 sensor it would code

Everything should code! Well except bad gas.

 

[Olddawg]

Everything should code! Well except bad gas.

I agree..no codes ever.. never got hot..always well maintained 20,000 miles on it.. soon as it happened I 5hought I got bad gas…replaced,all the gas…fuel filter and checked pressure all was good…

 

[Kevin D Pem]

You need to get in contact with a recently retired mechanic! Oh! Wait you are one!!! What a dilemma!

Check all connections to the sensors, special attention to those sensors that may float.

 

[Kevin D Pem]

Sounds like it in limp home mode