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I have a Volvo 940 from 1991, 2,3 liter injection engine.
One day was not possible to start. The garage changed the Jetronic computer from Bosch. They say that the fuel pomp was stopped by the Jetronic box. First they say that the alarm burn some connexion in the box. They tested the fuel pomp directly and was ok. After changing the Jetronic box the car started but the Lambda board lamp remained open and they say now is a fuel injection problem but they have to do a research and is very costly.
In fact they seam in the limbo of an open choice of problems. Their first reaction was to advice me to scrap the car. I am in Belgium not in a difficult country for those cars.
Thank you for your help.
Juan
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without my head under the bonnet here iam at a loss as its about this time that common rail was introduced so i could write two seperate and completely different answers ,check the temperature sensors thik their is two of them for the engine gauge and the fan ,also the heater timer/relay as either way i think its not injecting enough fuel when cold ,also it may pay to fit a non return valve in the inlet line to stop the fuel from running back when stopped ,yes i know its a bodge answer but if a fuel pump its 600 euros to change the valve in the pump .but agn i would need to know what type of injection system is used
If it's a 4 cylinder it's a 2.4 liter. If it's a 6 cylinder it's a 3.0 liter. The 2.4 liter engine comes with a carb, Fuel injection or even a turbo. Either way the 2.4 and the 3.0 take the same oil filter. The bosch is # 3330. I hope this helped and good luck.
If it is a Bosch LH 3.2 Jetronic System221 =long term fuel mixture too weak in part load stage If it is a Fenix 5.2 System 221=Lambda Operation; also Heated oxygen sensor (mixture too rich under part throttle) / long term fuel mixture too weak in part load stage
If it is the EFi model (electronic fuel injection) then change the coolant temp sensor
If it is the slightly earlier Bosch K-Jetronic mechanical injection it could be either the warm up valve or the 5th injector (Blue coloured part on the end of the fuel rail)
The thing you need to do is run a leak down test on the fuel pump overnight, hook up a fuel pump test guage to the fuel injector gas rail test port, run the engine, note the fuel pressure when you shut the engine off, it should not drop more than 5 PSI overnight, if it does you need a new fuel pump. Your car doesn't use a cold start valve, that was used on very early Bosch K-Jetronic fuel injection systems, they where last used in the 80's
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