LESS THAN 9.5 MPG CITY DRIVING!!!

[PonyGTrider]

Bad sensor or wrong sensor as Mustang5L5 said above in post #21 - needs to be the A2A version of the Crown Vic MAFs, not the OPs AA version.

I'm a C&L guy and have had no issues with both 73 and 76mm units running 19s and 24s. Just a tube change.

I already used the known good A2A with the same bad results. It is possible that both sensors were bad? Possible
Thank you

 

[Trogdor]

Dumb question. Where the MAFs facing the right direction?

 

[PonyGTrider]

Dumb question. Where the MAFs facing the right direction?

Yes

 

[AeroCoupe]

So did you run the car without an MAF? If not what MAF did you swap in to get the better mpg? Sorry, I just lost track and am not sure what you did.

 

[PonyGTrider]

So did you run the car without an MAF? If not what MAF did you swap in to get the better mpg? Sorry, I just lost track and am not sure what you did.

Sorry on my update I missed to include that after I removed the 70mm MAF tube and sensor I installed the stock 55mm MAF tube and sensor.
I already edited and corrected my mistake

 

[AeroCoupe]

Sounds like you have solved the mph issue. I’m going to say the obvious that the 70mm MAF needs to go into the trash. If you want a larger MAF buy a quality one like a C&L or Pro-M.

 

[PonyGTrider]

Sounds like you have solved the mph issue. I’m going to say the obvious that the 70mm MAF needs to go into the trash. If you want a larger MAF buy a quality one like a C&L or Pro-M.

I would agree with your statement but how in hell mine failed? Again I used two different sensors and both gave me crap! It seems everyone is tuning them with success but in my case it just not worked.
I had explosions in the mid pipes when pushing it a little while cold with the 70mm MAF but still have that with the stock one. I already replaced the ACT as suggested by a friend of mine but still…

 

[AeroCoupe]

Now that you have the gas mileage issue cleared up clear the codes and drive it around for a bit and then pull codes. Even if your CEL is not flashing or on clear the codes.

Once we know you don’t have any codes then this becomes a mechanical slash tune up issue.

 

[PonyGTrider]

Now that you have the gas mileage issue cleared up clear the codes and drive it around for a bit and then pull codes. Even if your CEL is not flashing or on clear the codes.

Once we know you don’t have any codes then this becomes a mechanical slash tune up issue.

Thank you for your suggestions. I’ll put them in practice.

 

[TOOLOW91]

What brand maf is it ? Who’s 70mm if it a stock maf in one of to see calibrated deals . Toss it .

Have those 19lb injectors flowed and cleaned make sure they are good . I’d get a pro m maf if you plan on keeping it a 70 mm. The transfer function will be more accurate in my opinion .

You need to see if the 02 are trimming fuel or if the ecu is just using default values because they are no good .

All of this together will make a Huge difference . Give it the timing back if it likes it to .

After reading and seeing the maf fixed it I had to go back and see if it my original suggestion . Which it was . Glad you got it sorted honestly .

Again if you need the big max . Pro m only for me

 

[PonyGTrider]

To be honest I haven’t done all what you had suggested before. I king of trying not to do too many things at a time, but I’m getting there.
I was surprised that two Ford 70mm MAF sensors and eventually I will have to go to the Pro M as you suggest.
Right now I’m running the base 10 degrees advance timing, since I have only a 65mm TB I will stay with the stock 55mm MAF set up for now.
I will clean my inyectores again and look into replacing the O2 sensors. I haven’t had any error codes coming out of the ECU but those O2 sensors could be on the last part of their useful life.

Thanks man

 

[General karthief]

Is the computer communicating?

 

[PonyGTrider]

Absolutely, I purposely unplug sensors and the ECU saves all the correct fault codes as well as the passed code 10 when no errors stored.