Question about 1998 Volvo S70

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Fuel problem Hard starting, once started runs great unless you stop, then it will stall and is hard to start

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Check for problems with the mass airflow sensor, oxygen sensors, and coolant temperature sensor. If the mass air sensor is bad or malfunctioning, it can cause the computer to add too much or too little fuel and create a problem (ditto for the oxygen sensors). A coolant temp sensor that is going bad may tell the car's computer that the car is cold when it isn't, and if so, the fueling will be wrong.

Posted on Jul 21, 2008

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What would cause you to lose fuel pressure while driving.


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DI have a 1983 ford f250 with 6.9 diesel engine. The previous owner told me that the front fuel tank did not work; he said that he was running the truck on the front tank once and that the truck started...


have you looked into the injectors, or injector balance? glow plugs just preheat the cylinders before you start turning the engine over. if the injectors are dumping too much fuel it will run rich and blow black smoke, lean it will dump white smoke, same as if it has an internal coolant leak, but smell different. Ford has had problems with EGR systems on some of their diesels, being an older truck how many miles is on it? and the front fuel tank could have a bad fuel pump, pretty common for them to do what you have described. Also might want to have the timing looked at on it! It ignites off of pressure, and if the timing is off it will adversely affect the ignition of the fuel which will make for hard starts, and poor running. there is a lot that needs to be looked at to figure this one out! could be quite a few different things. Good luck!

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1997 crown victoria is haveing a hard time starting/ stalls... rev up stalls... could it be coil packs? or fuel pump? once it is started and been running for the day it will usually start without problem.


its not likley to be coil packs or it would not start and run at all,, it could be fuel pump, or its letting the fuel run back to the tank when its been standing so when you try starting its running on whats in the carb untill the pump brings up more fuel all the way from the tank??? have a look at the fuel tank is the vent blocked???? try leaving the tank filler cap off? naughty yes! but if the vents blocked the car will run just fine after doing this,,, have a look at the fule pipes any holes in them witch would also let fuel run back to the tank and also let in air so the pump is pushing air as well as fuel and working twice as hard as it need to,,i cant think of any more right now,
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1 Answer

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To start up a cold engine requires reach mixture (air-gas).In your case it seems like the choke is not working ,so cold engine cannot start.If it is an injection operated system then it must have a temperature sensor which suppose to turn the choking on when cold engine needs to get started.Either the sensor is faulty or the choke or between the two there is a faulty connection somewhere.

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