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1990 2.9 map sensor?

Dirtman

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1986RangerXL

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Agreed. Thanks.
Some 3rd party IACs were pretty junk, so if you have a Motorcraft still in there and it works properly I would keep it.

The MAP sensor wasn't a huge issue, so don't see the need it for it

But hey it's your truck, if it makes you feel better doing it then go ahead
 

Ranger101

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Some 3rd party IACs were pretty junk, so if you have a Motorcraft still in there and it works properly I would keep it.

The MAP sensor wasn't a huge issue, so don't see the need it for it

But hey it's your truck, if it makes you feel better doing it then go ahead
Thanks for the words of wisdom. No 3rd party IACs for me.
 

Ranger101

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Some 3rd party IACs were pretty junk, so if you have a Motorcraft still in there and it works properly I would keep it.

The MAP sensor wasn't a huge issue, so don't see the need it for it

But hey it's your truck, if it makes you feel better doing it then go ahead
I’m going to replace my vehicle speed sensor and transmission filter. I shopped O’Reilly and they had both for $24.99 and $34.00 respectively. I called the Parts Dept at the Ford Dealer and they quoted $241.91 for the VSS (has to be ordered) and the filter was discontinued.
 

Cees Klumper

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Reviving this thread once again. I think I figured out where one mystery vacuum line goes to, and it must be my MAP sensor. It's a line that T's off of the one that also 'feeds' the heater box. But, rather than being mounted on the firewall, or the passenger fender, my line goes straight into a wiring harness, which then runs to under the fan housing on the passenger side firewall, then loops back around towards the power distribution box. And ... never comes back out again, that I am able to trace. So, unless I undo all the (original looking) insulation wrapping of the harness that it goes into, it doesn't look like I can figure out where it terminates. Which I think it does, somewhere along the line, without connecting to an actual MAP sensor. So although my truck was sold and stayed in California since 1990, it does not seem like it ever had a MAP sensor, although the vacuum line to enable it, does seem to be in there.
 

Nez'sRanger

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Reviving this thread once again. I think I figured out where one mystery vacuum line goes to, and it must be my MAP sensor. It's a line that T's off of the one that also 'feeds' the heater box. But, rather than being mounted on the firewall, or the passenger fender, my line goes straight into a wiring harness, which then runs to under the fan housing on the passenger side firewall, then loops back around towards the power distribution box. And ... never comes back out again, that I am able to trace. So, unless I undo all the (original looking) insulation wrapping of the harness that it goes into, it doesn't look like I can figure out where it terminates. Which I think it does, somewhere along the line, without connecting to an actual MAP sensor. So although my truck was sold and stayed in California since 1990, it does not seem like it ever had a MAP sensor, although the vacuum line to enable it, does seem to be in there.
That vacuum line goes behind your dash and operates something to do with the A/C system. I replaced my wiring harness a while back and followed that line for the heck of it... It looks like it opens a vane when you turn on the A/C.
The map sensor would be located above the ac unit in the firewall, unless (as the others have stated) you have a California emissions vehicle with a mass air flow system.
 

Cees Klumper

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Ah, ok thanks. Yes, it's a CA vehicle and I did not realize that, for those, the MAF takes the place of the MAP. I do have a MAF for sure. And A/C, so you're no doubt right that that's what that line is for. In any event, it holds vacuum, so if that is always the case, not responsible for any vacuum leaks (have been having a rough idle and stalling issue lately that seems connected to a bad power brake booster check valve, but just chasing down all possible suspects).
 

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