1996 Aerostar XLT. Lean code.

[Mark Embury]

My 1996 Ford Aerostar 3.0 XLT runs great, never stalls, good gas mileage. Recent trip 400 miles 21 a gallon. It has the lean run code.

 

[BrooklynBay]

What is the code number?

 

[Mark Embury]

PO171

 

[BrooklynBay]

That might be caused by a vacuum leak.

 

[Mark Embury]

Mechanic read code, observed evap cannisterhose to intake, replaced, code returned after two cycles. Van starts every time, does not stall, sluggish in the mountains. Help.

 

[don-ohio]

Bad spark plug or engine miss causes lean code too.

 

[Mark Embury]

Took it back to shop. No charge for labor, owner said diagnostic smoke test should have been done. PCV dirty and loose. Replace for $20, no labor charged. Advised mass air flow meter needs testing, I will replace it myself. Is there any special method? Look straight forward.

mark

 

[BrooklynBay]

You could clean the mass air flow sensor with a spray from the auto parts store.

 

[Mark Embury]

I will do that tomorrow.

Thanks.

 

[Mark Embury]

All fixed. Wires, plug, coil pack, maf sensor.

 

[zenish]

All fixed. Wires, plug, coil pack, maf sensor.

that was quick.lol

 

[Mark Embury]

that was quick.lol

Well the work was done in February. So, lol it is. I have poor gas milage at times. No codes. Changed fuel filter. Have good power no stalls, quick starting. I have a brand new boss upper plenum with the sensors, new OEM Ford, slap onnnew egr, and see what happens, any advice?

 

[Mark Embury]

That might be caused by a vacuum leak.

Josh, having new problem, can't get site to post new thread. Friend smell fuel in exhaust and there are no codes.

 

[BrooklynBay]

Maybe the fuel pressure regulator has a ruptured diaphragm? Pull off the vacuum line to see if fuel is present. Are you trying to post a new thread in this section?

 

[MakinJeepsWeep!]

have the 02s been repalced at anytime? I replaced mine in my b3000 3.0 when it just stareted running "off" of its normal pepping self and it was like i dropped in a new motor. They did also have almost 250k miles on them but it also was nt giving in codes. They had just gotten 'lazy' so to speak, they work and dont throw codes just not really as they should. further during that time i read that Ford states they should be changed at least every 100k or sooner.