1995 Volvo 960 starting troubles
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1995 Volvo 960 starting troubles
My car will start with no problems when cold,but after you drive it for a while and turn it off and try to start it again it will try to start but then it will start shaking and shut off. you have to wait some hours till it cools down to start or raise the hood and loosen the hose attached to the idle control valve and start the car, it takes a while until it starts and accelerates till i tighten the hose again and it will stay on but i have no idea what it could be.
Senior Member
Joined: Jul 2009
Posts: 185
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From: Chicago
It sounds like a bad, MAF, temp sensor, or a vacuum leak or a leak in the intake air ducting.
Or the warm up valve in the air filter box is stuck in the heat position and the engine is breathing air from the exhaust manifold. Disconnect the foil tube that run under down to the under side of the air filter housing. See if that helps, if it does, you will need to close that flap permanately. You do not want it breathing under the hood hot air.
Inside there is a diverter flap, that when cold, draws air from the exhaust manifold to warm the engine's air quickly for emissions. That valve with age sticks, some are unlucky in that it will stick open to the hot air, this draws heat into the intake and messes with the MAF sensing. Also after time it will fry out the MAF.
How is the fuel mileage?
How does it idle? An intake gasket leak will make a hot engine difficult to start. Does it idle smoothly? Or has a miss.
Are you getting spark to all spark plugs?
But if it is starting by removing the idle motor hose, makes me think it is running rich and your mileage should be lower and acceleration should be slower, so that might point to a temp sensor that is still sending the signal that it is cold.
How is that air filter?
Another thing that may cause these symptoms is a bad throttle sensor.
With my car, an annual event is cleaning and tightening all under hood electrical connectors.
DanR '94 964 353,000 miles (119,000 on the new engine)
Or the warm up valve in the air filter box is stuck in the heat position and the engine is breathing air from the exhaust manifold. Disconnect the foil tube that run under down to the under side of the air filter housing. See if that helps, if it does, you will need to close that flap permanately. You do not want it breathing under the hood hot air.
Inside there is a diverter flap, that when cold, draws air from the exhaust manifold to warm the engine's air quickly for emissions. That valve with age sticks, some are unlucky in that it will stick open to the hot air, this draws heat into the intake and messes with the MAF sensing. Also after time it will fry out the MAF.
How is the fuel mileage?
How does it idle? An intake gasket leak will make a hot engine difficult to start. Does it idle smoothly? Or has a miss.
Are you getting spark to all spark plugs?
But if it is starting by removing the idle motor hose, makes me think it is running rich and your mileage should be lower and acceleration should be slower, so that might point to a temp sensor that is still sending the signal that it is cold.
How is that air filter?
Another thing that may cause these symptoms is a bad throttle sensor.
With my car, an annual event is cleaning and tightening all under hood electrical connectors.
DanR '94 964 353,000 miles (119,000 on the new engine)
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Jul 18, 2006 12:03 PM
