Oldsmobile Ciera
Ford F-150

Where are the MAF MAP and coolant temp sensors located on a 1987 Oldsmobile Ciera?

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2004-11-14 13:13:11

OK, a late 80GM A & X body. Most Manifold Absolute Pressure

sensors are located on the firewall with GM Vehicles. Others

arelocated affixed to the top of the engine somewhere along the

intake area. Try looking from the center of the firewall on over

remotely close to the vacuum booster which is a huge frisbee on its

side shaped thing. The MAP is about an inch high, about 1/2 inch

thick and about 4 inches wide. there is a small rubber vacuum boot

pluged into it with a vacuum capilarey line going to the bottom of

the throttle body or manifold, and a connector off of its rear. If

the Olds has a Mass Air Flow Sensor, it would be in the same spot

as all Mass Air Flow Sensors are put. The greatest air mass travel

area of the engines air input. A cylindrical spaped doo-dad that

has a screen on both sides, and a wire and or ring shaped thing

inside the screened cage. WARNING! Mass air Flow Sensors are super

tempremental. Do not remove the screens on the sensor for greater

performance or any reason. You could only do more damage than good.

If you touch and bend the heat wire on the MAF sensor, the ONLY

place you can successfully install it is a slam dunk straight into

the garbage can. Funny how so many people don't believe that can be

true, and wind up buying a new part for the tune of about 2 to 5

bills (Ben Franklins). The coolant sensors (yes, with an "s")

theres two of them. One is a switch and the other a sender. They're

pretty important on a GM car. Even if your thermostat and cooling

system is physically and mechanically working great, without the

switch sensor, overheat is likely to occur, esp. in stop and go

summertime. The first more important temp sensor is the coolant fan

switch which screws into the engine's cylinder head. It's single

usually green lead goes to a relay which is what really supplies

the juice to the fan. Note: This relay is a commonly replaced part.

It fails after a half million cycles or so, so if you have

overheats due to electric coolant fan failure, the relay could

likely be the culprit. Try borrow/swapping with one that you know

works for a fact. The other coolant temp sensor is located

somewhere on the coolant housing between the upper radiator hose

coolant inlet and the thermostat housing. Although not as directly

critical as the switch that operates the fan relay, this is a

sender sensor which means it will have a variable resistance. It

has two wires going to it, neither which are grounded by the

sensor. The sensor supplies the return signal to the ECU(ECM in

this case) telling it the approximate temp range of the engine and

provides its portion of information to the computer toward proper

engine management. If you are having problems still, Be sure to

only visit well trained automotive technicians, such as auto

service garages that employ ASE certified technicians.

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