20 Most Recent 1994 Volvo 940 - Page 9 Questions & Answers

hi fisrt check youer brake light blubes
if ok check the brake switch

The fact that the engine dies without warning and that the effect is intermittent indicates that the problem is electrical and that it is most likely a break of some kind. Start from the top and look at the main fuse and the main relay and then the fuel pump relay (sometimes the two are on the same board in the same relay unit). Really inspect these thoroughly and check the solder joints, sometimes you can get an annular crack running around a pin and it will not break the circuit until vibration or high temperature causes the crack to open briefly. When you switch the car on these relays should give a healthy click. Most electrical problems can be found with a wiggle or a tap; wiggle the wires, that is, and tap the device they connect to. A short in the MAF (air density unit) should not necessarily cause the engine to die but maybe to change its idling characteristics. Unplug it whilst the engine is running to see its effect, in fact most devices may be unplugged to check their effect without doing any long term harm. Remove any foam that could interfere with its operation. Spray clean it with electrical spray cleaner (zero residue spray) but do not touch! Do not use carb. cleaner spray as it is too aggressive. 1) Check all the electrical things the ECU takes signals from in order to run the engine: throttle position sensor, idle speed control, Intake air temperature, manifold absolute pressure, engine temperature sensor. crank position sensor, cam position sensor 2) Check electrics, coil (bad to diagnose if intermittent) low tension, high tension distribution, plug leads and plugs, hall effect sensor. 3) Check air: check that all vacuum pipes making any kind of connection with the inlet manifold are air tight with no cracks or loose joints. If you have evaporation emission control make sure that the purge and vent valves close and open when they should. If you have Exhaust gas recirculation check that the valve opens and closes and that all feed ports to it are free and clear of carbon build up. 4) Now check fuel system: pre-pump, main pump, fuel filter, fuel pressure regulator, injectors

Should be marked on a lable inside and on the glovebox door.

its not a fourth gear its overdrive and its supposed to do that

The fuse may be identified as 'Accessories' or the problem may not be related to a failed fuse at all. I suspect your car has a dimmer like most that varies the intensity of the dash and other panel lights. Dimmers do fail so the lack of illumination may be caused by a failed switch or dimmer.

HAVE CAR SCANNED PROBLEM COULD BE COOLANT FAN FAULT OR FAULTY COOLANT TEMPERATURE SENSOR.THATS MORE LIKELY WHY YOUR CHECK ENGINE LIGHT COME ON.TAKE CAR TO AUTO ZONE THEY WILL SCAN IT FREE.

I would first check timing. Sounds to advanced. More detail would help year make model. How is performance while driving under normal conditions

yes,volvo,s have a problem with this,remove clean and reinstall the pcv filter or replace it,excessive crank case pressure can allso lead to blowing engine seals and gaskets.

As you described the problem I'm afraid it shows a problem with engine piston rings, the engine itself is burning oil and the part you are talking about is called PCV, they can cause problems but not as severe as you described. Hope it helps, comment if you need more advice and please rate the answer, it helps me with my general ratings, thanks!

Many things could cause this issue. First of all; is there a check engine light? If not then it is probably a fuel-delivery issue, not many parts in the fuel system are linked to the computer and in turn do not trip trouble codes. If there is a check engine light then your local autoparts store should be able to scan and then you can tell us more.

you dont will have to be taken to a shop,
there they have the right tools and knollage to handle that,

most engine are interferance engines-
if engine is turned over with belt off the all valves will be bent- resulting in costly repair-
so disconnect the battery before it is towed.

fuel pump.

YES.you can do it easy,prop the car up on stands,climb under and undo the square plug on the bottom of the gearbox,catch the oil in a can with the side cut out ,then to fill undo the square plug on the side(making sure you have replaced the drain plug ha.ha.)and fill until oil flows out and stops dripping,then replace bolt,JOB DONE.only do up bolts heavy hand tight.

depends where you buy it

have the mechanic recheck his adjustments on the transmission range switch. the shifter shaft goes right throug the switch and it may have been adjusted or replaced when the backup lights were repaired

Volvos Greatest desaster the Transmision (ecu) a sepperate control unit for the transmision when it finallay strats to give out it also stops working you might need a pro for this one Transmision specialist for Volvos note ( for Volvos) not everyone knows what they are doing just cause they have a Mechanics Lic.

Sorry for the delay.
I am personally going back to answer your unanswered question. I do not know if you still need the answer, but I am going to answer it in case you still do.

Click on the following direct Link. It has the Timing Belt/MARK(S) Diagrams that you will need.

Again my apologies...
Let me know if this helped, or if you have additional information or questions. Feel Free to contact me at FixYa.com!
http://www.2carpros.com/car_repair_information/year/1994/make/volvo/model/940/1994_volvo_940_timing_belt_diagram_marks.htm

In general, the answer is yes. I have not changed one in quite a while but almost always you have to lift the engine to get the oil pan off. You need the oil pan off to loosen the main bearing caps.

Iam not sure this helps but I would replace the fuel filter first.