960 computer issue?
960 computer issue?
I took my 92 960 Volvo to a wrench who has a good amount of experience with volvos. He has confirmed my fuel injection timing is not correct and has determined that this is a computer issue as everything else on the car has been cleared. Ignition coils are fine, injectors are fine, compression is fine. Check engine light is on with an O2 sensor error. I have reduced power and my mpg has dropped a lot! I have about 2 needles till the red and normally at this point I already have 360 to 380 miles on the tank, now I only have about 300. So my question is, is there anything I can check like a connection to the computer to make sure it hasn't come loose? Before I go spending a lot of money I just want to triple check that it isn't anything stupid.
Update: Report from Machanic: "Eng missing on #1 #2 #4. Pluggs, Coils Injectors ok, compression ok, no signal from computer on injectors."
The tech also said he had 2 other earlier 960's that were inline engines that had similar problems and is hinting it could be a problem with either equipment or design. Not that i can do anything about design or equipment issues 18 years later. Any ideas?
The tech also said he had 2 other earlier 960's that were inline engines that had similar problems and is hinting it could be a problem with either equipment or design. Not that i can do anything about design or equipment issues 18 years later. Any ideas?
It is not design. But if it is functioning as designed it will run extremely well.
The signal for the injectors originates at the cam sensor, if there is a fault there, then the computer doubles up the injector clicks to maintain power from the engine, but causes poor acceleration and high fuel consumption.
You have not said anything about the intake manifold gasket, this is the first thing to suspect. The early years '92 - '94 came with a red colored gasket, the replacement will be greenish. The early gasket eventually will get sucked in and start allowing un-measured air to enter, which for some reason does not cause the engine to run lean, as one would expect, it seems the computer just adds more fuel and so the engine runs rich and has poor acceleration. It is not a question if the red gasket will get sucked into the manifold but a question of when. Have the mechanic check with some propane or starting fluid around the intake gasket, usually at cylinder 1 will be the cause.
DanR '94 964 356,000 miles (122,000 on the new engine)
The signal for the injectors originates at the cam sensor, if there is a fault there, then the computer doubles up the injector clicks to maintain power from the engine, but causes poor acceleration and high fuel consumption.
You have not said anything about the intake manifold gasket, this is the first thing to suspect. The early years '92 - '94 came with a red colored gasket, the replacement will be greenish. The early gasket eventually will get sucked in and start allowing un-measured air to enter, which for some reason does not cause the engine to run lean, as one would expect, it seems the computer just adds more fuel and so the engine runs rich and has poor acceleration. It is not a question if the red gasket will get sucked into the manifold but a question of when. Have the mechanic check with some propane or starting fluid around the intake gasket, usually at cylinder 1 will be the cause.
DanR '94 964 356,000 miles (122,000 on the new engine)
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