1990 ranger 4.0 MAP sensor???

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Sep 15, 2004 | 11:18 AM

Cocoagriz

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1990 ranger 4.0 MAP sensor???

Hello all; I need to know the location of the map sensor on a 1990 ranger 4.0 auto. I have looked and traced vac lines but I cant seem to find it. I just aquired this truck, it did not run when I got it. I have replaced the fuel pump, plugs and wires. The truck runs now but not great yet. It has poor low speed accel and chugs black smoke when missing. Any help is appreciated. THx..

Sep 15, 2004 | 11:34 AM

87 XLT

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From: SoCal

First thing to do is pull the trouble codes to see if the MAP IS bad. I dont know where it's located on yours.

Sep 15, 2004 | 11:49 AM

RangerRuss

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From: Cypress, CA

The 4-cylinder Rangers of that era do not have a MAP sensor. Do not be surprised if yours does not have one.

Russ

Sep 15, 2004 | 12:07 PM

Rockledge

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From: Connecticut

If your truck has an MAF sensor, and I'm pretty sure it does, then then there is no MAP sensor. However, it may or may not (I'm not sure) have a BARO sensor, in which case you would probably find it up on the firewall somewhere. There won't be any vacuum line going to a BARO sensor.

Taking it a bit further, you might even try cleaning the MAF sensor itself.

Also, make sure the plug wires are hooked up correctly.

Sep 15, 2004 | 05:34 PM

Cocoagriz

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Thanks for the quick info.. That makes sense that it does not have a map sensor, because I have looked everywhere for that thing. I did find the baro sensor, looks very similiar to a map sensor. I will clean the maf and see what happens. Rockledge - I actually used your plug wire diagram since the one in the chiltons manual that I have is incorrect. Thanks , I'll post results.