20 Most Recent 1992 Volvo 740 - Page 6 Questions & Answers

Contact the local salvage yard on this, they have what is called a parts interchange catalog that lists all this info, we do not have it.

if the oil light is on and you have the pan full with oil it's a faulty oil sending unit provided that there is adequate pressure. make sure you check the validity of oil flow by just removing the oil fill cap on the valve covers while the engine is running you should notice some oil flow. if there is your oil sending unit is bad if there is not your oil pump is no good. please rate.

if you know the wiring to the fuel guage is ok then could be the fuel sender in the tank,if the ssender is bad youll have to buy one and connect the wiring to the new sender andcheck it if it works fine then you ll have too replace it. if it doesn t then it s in the guage cluster. good luck

Im sorry to say but if the fluid is full in the ****** then you need to have the ****** rebuilt. to check the fluid level start the car and allow it to reach operating temp then make sure car is on level ground, remove the ****** dip stick and clean it and install it all the way in then remove it and read the level, if low add 1 pt at a time until full, if its full then you have ****** problems,

#1 suspect is the fuel pump relay. Can you hear the fuel pump spin up for a second when you turn the key to the On position? If not, check fuses for fuel pumps. On a 240 it is fuses #4 and #6, but I am not sure about on a 740. Pull them out to examine them because the tips tend to corrode off fuses this old, so they can fail and still look OK until you pull them out.
If the fuses are good, take a paper clip and jumper between the fuel pump fuses. If the fuel pump hums and the car starts, the fuel pump relay is failing to close. That relay should be up under the dash above the passenger's right foot. Look it up on a parts website so you know what it looks like. If a new fuel pump relay will not close either, then we go to the #2 suspect, which is the engine computer. The computer should be behind the kick panel to the right of the passenger's right foot. The typical failure mode for the computer is that the transistor that supplies the ground for the fuel pump relay fails. Do NOT defeat thissafety feature by simply grounding the fuel pump relay. If the computer has failed, get a rebuilt computer (available from many suppliers)
#3 suspect is the lead on the crank position sensor. Take a light and maybe a mirror and look at the wire that runs down between the engine and the firewall to the sensor that is attached to the top of the bell housing. If the insulation is blistering off that lead, the sensor must be replaced. This is not a bad job if you have really skinny arms and really small hands, and the sensor has not rusted in place. Do NOT drop the 10 mm bolt that holds the sensor into the hole the sensor goes in, or you will not like yourself. The reason this was not the #1 suspect is that unless this is a very low mileage 740, this sensor has almost certainly already been replaced, and the replacement sensors are better made and last forever.

You describe a vacume leak in a hose off or cracked. look around good in and quite place with the engine running pulling off and reconnecting hoses till you find the leak and fix it.