My car have problems at 900 rpm, it start well and over 1000 rpm is ok, i think so, whel sorry for may english bat i need help, please any answer. Maybe i can find some instruction how to repair, fix this problem. Where i can get a manual for this car, especial for engine. Thks.
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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.
the transmission fluid on the B230f engine with automatic transmission (Volvo 240, 740, 940), goes into the filler neck with the large yellow dipstick. it is located about 5 inches below the oil dipstick. good luck :)