Question about 1994 Volvo 940

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My 94 volvo sw will not accelerate whne goign up hill. It stays at 40mph. It is no starting to not want to increase speed on level land.

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Difficult to be exact without driving the car, but I had a similar problem on a Rover 3000 Fastback about 10 years . It turned out to be that the catalytic converter had failed.

I am not exactly sure if your Volvo has a CAT, but if it has then it is probably the culprit

Posted on Nov 12, 2009

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Van has been loosing power going up hill. Runs fine on level land and going downhill. lately it has been stalling when u first start it up.


try checking your crankshaft or tps throttle position sensor it could cause you to lose power at times

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I have a 1997 landcruiser,when driveing at 40 to 50mph a vibration appers when accelerating up to 70mph it gets worse take foot of accelerater goin down hill thers is no noise or vibration


Check your universal joints in the drive shaft. When you remove your foot fromt the accelerator you are no longer applying power to the rear wheels and in turn there is no load on the drive shaft. When you accelerate below 40mph, there isn't enough centrifugal force to cause the driveshaft to wobble, but once you go above 40mph, it begins to show slop.

Another thing to check is your wheel bearings.

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The flashing light indicates you have a big misfire that could damage the catalytic converter.. Being you were going uphill (under high load) this would indicate an ignition issue. You may have a bad coil or wires or a bad spark plug. The reason you could only go 30mph was because the computer was put in limp mode. This is a stratagy to prevent excessive damage to components. , Get it checked out ASAP

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If the engine revs up while in drive and running at 40mph, your transmission is probably slipping. Try checking your transmission fluid level. If it is OK, I would get it by a garage to have them look at it to cofirm.

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