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Chris (aka- Moose)
Chris (aka- Moose), Technician
Category: Ford
Satisfied Customers: 46032
Experience:  16 years experience
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I have a 1999 ford f53 motor home with a v10 gas. After

Customer Question

I have a 1999 ford f53 motor home with a v10 gas. After driving 60 miles or so it starts losing power and hesitates. Scan tool shows p1131,p1151,p1500and p0503 please help.
JA: Has the vehicle turned into a gas hog? And how does it start -- same as usual?
Customer: It sputters when cold and Transmission shifts hard
JA: What is the model of your '99 Ford?
Customer: Monico La Palma
JA: Are you fixing your vehicle yourself? What have you tried so far?
Customer: Yes
JA: Anything else you want the mechanic to know before I connect you?
Customer: This RV sat for many years with last owner
Submitted: 4 months ago.
Category: Ford
Customer: replied 4 months ago.
Posted by JustAnswer at customer's request) Hello. I would like to request the following Expert Service(s) from you: Live Phone Call. Let me know if you need more information, or send me the service offer(s) so we can proceed.
Expert:  david craig replied 4 months ago.

Hi Im David, thanks for visiting the site,

P1131 FORD - Lack of Upstream Heated Oxygen Sensor Switch Sensor Indicates Lean Bank 1 Possible causes - Faulty Upstream Oxygen Sensor Bank 1 - Fuel pressure high or low - MAF sensor dirty/defective - Vacuum leak on engine - Leaking fuel injector or fuel pressure regulator - Faulty Powertrain Control Module (PCM)

P1151 FORD - Lack of Upstream Heated Oxygen Sensor Switch Sensor Indicates Lean Bank 2 Possible causes - Faulty Upstream Oxygen Sensor Bank 2 - Fuel pressure high or low - MAF sensor dirty/defective - Vacuum leak on engine - Leaking fuel injector or fuel pressure regulator - Faulty Powertrain Control Module (PCM)

P1500 FORD - Vehicle Speed Sensor - Faulty Vehicle Speed Sensor - Vehicle Speed Sensor harness is open or shorted - Vehicle Speed Sensor poor electrical connection - Damaged Powertrain Control Module (PCM)

P0503 FORD - Vehicle Speed Sensor 'A' Intermittent 0 | Add Comment Possible causes - Faulty Vehicle Speed Sensor - Vehicle speed sensor harness or connectors is open or shorted - Vehicle speed sensor circuit poor electrical connection - Faulty Engine Control Module (ECM)

Customer: replied 4 months ago.
do you think I should change the PCM
Expert:  david craig replied 4 months ago.

no, i dont. thats a waste of money. you need to prove the faulty components before thowing parts at the vehicle.

Customer: replied 4 months ago.
I installed the SCT 5 star program and it runs better but not perfect
Expert:  david craig replied 4 months ago.

the transmission control module needs to be interrogated to see if its faulting the harness or vss itself. and you need to do a vacuum leak check to see where the leak is, causing the engine to run lean, which is causing the loss of power and sputtering.

Expert:  david craig replied 4 months ago.

take a can of carb cleaner and spray all vacuum hoses/lines/connections, around the intake base, maf, throttlebody etc.... listen for an rpm change

Customer: replied 4 months ago.
Thanks I will try it tomorrow. I will keep you posted
Expert:  david craig replied 4 months ago.

ok, sounds good.

Expert:  david craig replied 4 months ago.

checking in to see how its going

Customer: replied 4 months ago.
I did not have time today, I am in Daytona for thee classic car turkey run. I will keep you posted after I hit it with carb cleaner.
Expert:  david craig replied 4 months ago.

ok

Customer: replied 4 months ago.
Powerstroke all the way.
Expert:  david craig replied 3 months ago.

any luck?

Customer: replied 3 months ago.
I going to check it tomorrow after work.
Expert:  david craig replied 3 months ago.

ok

Expert:  Chris (aka- Moose) replied 3 months ago.

Welcome, I'm Chris (aka Moose), my normal schedule online is around lunch and after dinner till early morning.

So far you look to have a vacuum leak and a rear axle speed sensor failing. So far have you done any steps to diagnose or address either of those?

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Thanks for using Just Answer, Chris

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