thanks I was hoping I wasn't crazy or going to get flamed for being the newbie who confused some part with a MAP sensor. Glad I was right.

 

NP. Just keep the degreser out of the alternator as well. Just bag it with grocery bags and use the handles to tie. If you have an air compressor or shop vac use them to clear left-over water out when done.

 

Thanks for the advice, but now, at this point, the motor shop has brought me back a car that is still in the same condition as before, I think I'm just going to cut my loss in time and money.

 

I beleive that is what the call the barometric pressure sensor on the firewall

The map sensor stands for manifold absolute pressure and is usually bolted right to the intake manfold.

All that sensor is doing on the firewall is picking up what the outside barometric pressure is at the current time.

 

I'll let the mechanics battle this one out. I have NO idea.

 

Trust what I say here. Your car does NOT have a MAP sensor. Period. End of story.

That sensor that he showed on the firewall is merly a barometric pressure sensor. All its doing is taking a sample of air to determine the barometric pressure outside (it changes with altitude) So right now your at sea level. Lets say you drive up into the mountains. Well if the computer doesnt adjust for you new altitude it will never run right. Hence thats what the sensor is doing.

Now a MAP on the other hand is measuring manifold absolute pressure. And its bolted directly to the intake manifold.

That sensor he showed doesnt even connect to the motor what so ever. Its just a black box with a 3 wire plug and a little tip on the end that takes the measurement.

I know you called me over the weekend wanting me to make a house call but I am just not able to do it being I just wouldnt have the tools needed to fix the car. I think its about time to bring it in (either me, Ford Speed, All American, etc.) Does the car drive at all?

 

^this guy is good and will not overcharge you. He can also teach you a lot about your car without being rude.

 

in the map sensor confusion I have heard a lot of people call it that, it's probably actually a BAP sensor (Barometric air pressure)

 

It is a BAP sensor as Dave stated. You can clearly see in the same pic, a MAF sensor on the air intake tube.... You either have 1 or the other, not both!

 

On 86 - 88 cars 'Air Density" cars,.. the top circle is a MAP sensor on those models. They do not have a MAF meter.



The second image is the engine bay of an 88 GT. As you can see,.. it has the same casing for the BAP,.. but here it is a MAP sensor. You can also see that there is no MAF meter.

If you ever convert your 86 - 88 from Air Density to MAF. Part of the conversion process is to leave the MAP sensor wired up and powered,.. but the vacuum line is disconnected and plugged off. It then becomes a BAP.

I'm not an expert here.. but hopefully I can explain the difference in laymans terms.

Air Density the ECM uses a preset table for the Air/Fuel. The most of the engine management is done through the MAP sensor which reads manifold vacuum,.. then the Throttle Position Sensor (TPS) and then the O2 sensors which are mainly there to signal ignition advance controls. Basically it says at 3000 RPM there should be a preset amount of air entering the engine and it will signal the injectors to pulse a preset amount of fuel. No more,.. no less.

Starting in 1989,.. (1988 for California cars) Ford started using MAF (Mass Air Flow) meters. It has a heated wire,.. and depending on how much air passes over it will change the voltage signal to control the injectors and the ECM knows how much air is entering the engine and will pulse the injectors accordingly. It is still reading manifold vacuum,.. but it does not have as much effect on engine management as it did when it was Air Density. Which is why MAF cars are much more friendlier to cams, intakes and other modifications then an AIR Density car will be.

I'm sure I'm leaving a lot out. I'm no EFI expert,.. I know more about the 4.6 engines then the EFI 5.0 engines. I usually convert 5.0 EFI over to Carb when I buy one. That 88 is one of the few that I owned that stayed EFI.


Hurst