Question about 1989 Volvo 740

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Can't find the heat sensor, 1989 Volvo 740GL, 4-cylinder, SOHC

Where is the heat sensor that feeds the computer on a 1989 Volvo 740GL, 4-cylinder, single cam, automatic? I've been told it should be close to the thermostat housing, but it isn't. The only sensor I found that resembles the replacement is in the middle of the block on the driver's side and it runs to the heat guage. Help.

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The sensor you located is the Heat Sensor.

Posted on Apr 13, 2009

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I own a 1989 740GL.The engine is the standard "


Wait - you said it has no spark, and then started asking about fuel injector relays. I am confused.
When you crank the engine, do the spark plugs spark? If not, the most likely problem is the trigger mechanism. The '89 740 used a sensor in the bell housing detecting flywheel position. This car is about due for its third sensor as the insulation on those things tends to degrade and need replacement every decade or so. If you are still on your original sensor, you have been very lucky to make it this far.
Find the person with the smallest hands you can find to help you replace that sensor and be careful not to drop the bolt down in to the hole where the sensor comes out. Also, if the sensor is rusted in place, be patient. Don't break it off in the hole.
If you are not getting fuel, you will not hear the fuel pump spin up for a second when you turn the key to the on position. You should be able to bypass the fuel pump relay using a paperclip at the fuse box. Just find the fuel pump fuse and power it from an other fuse. If that spins up the fuel pump and starts the car, then you have to worry about finding the fuel pump relay. I can't help with that because I have never needed to find it on a 740.

Mar 05, 2011 | 1989 Volvo 740

2 Answers

How do i find TDC when set the timing marks on 1990 volvo 740gl


if you know the firing order of the engine and also the position of the no.1 cylinder you are off to a good start.
Remove the plug on the no.1 cylinder and turn the engine until the piston starts coming up on compression stroke, you can fing out if it is on compression stroke by placing your finger or thumb over the spark plug hole, you will feel the pressure under your thumb or finger as the piston starts to come up the bore.
when you can feel that pressure you can remove your thumb etc and stick a medium size screwdriver into the hole making sure you hold it from falling into the cylinder, rest the end of the driver on top of the piston and turn the engine slowly by hand only, (not by the starter) until the piston has come up to the top of the cylinder, now have a look at the harmonic balancer on the end of the crankshaft, there should be markings on it and one marking will have a "0" with TDC above it, line that mark up with the pointer and that will be top dead center

Jun 26, 2010 | 1990 Volvo 740

1 Answer

Firing order for a dodge spirt 1990


I do not know if you have the 2.5L SOHC, or 2.5L TURBO, or 3.0L V6 Engine; however I have included all of them below.

For the 2.5L SOHC AND 2.5L SOHC TURBO:
Firing Order:
1-3-4-2
Cylinders:
.....(back)
1....2....3.....4
.....(front)
Distributor:
......(back)
......1.....3
(+)............(+)-screws
......2.....4
......(front)
Rotation: Clockwise.

For the 3.0L V6:
Firing Order:
1-2-3-4-5-6
Cylinders:
....(back)
1......3......5
2......4......6
.....(front)
Distributor:
.....(back)
(+).2...1
3...........6
.....4...5..(+)-screws
.....(front)
Rotation: Counterclockwise

Let me know if this helped, or if you have additional information or questions. Feel Free to contact me at FixYa.Com!

Mar 21, 2010 | 1989 Dodge Spirit

1 Answer

Cuzn pulled all spark plug wires out without numbering them.. now i don't know where they go. i have a 91 volvo 740 2.3 4 cylinder.. HELP???


Cousins are fun! Is this a "distant" cousin? lol I feel your pain.

For the 2.3L SOHC AND 2,3L SOHC TURBO:
Cylinders:
(back)
...4
...3
...2
...1
(front)
Distributor:
(back)
o..o..o..o
^..^..^..^
|....|...|...|
4..3..1..2
(front)

Let me know if this helped...or if you have additional information of questions. Feel Free to contact me at FixYa.Com!


Mar 16, 2010 | 1991 Volvo 740

1 Answer

I need to know where to jack up a 740GL Volvo and where to place the car stand to do an oil change.


Always jack a car by the frame. Also put the jack stands on the frame.

Nov 12, 2009 | 1989 Volvo 740

1 Answer

After driving around on a hot day, my 1989 Volvo 740GL will not start back up. The engine trys to turnover, however. The fluids do not over heat, but I have to wait until later in the day when it's cool to...


Sounds like it could be vapor locking. Especially if it starts after it gets cool. Try adding a can of octane booster to the fuel next time you fill up and see if that helps.

Jul 06, 2009 | 1989 Volvo 740

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