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97 Volvo 850 Intermittent starting issues.Every now and then it will sputter and become hard to start,theres no problems that I can find,and no codes.It has only done this when its warm/hot

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Posted on Jan 02, 2017

  • 35 Answers

SOURCE: volvo 850 won't start occasionally

Hey Kolby!

Sounds like you've got an issue with your alarm module, causing the immobilizer to activate (also known as a "start inhibitor"). I'm not sure what type of alarm you've got, but this will probably help you find out if there is something wrong with it:

There is a panel with relays on it behind the dash. At the bottom of the steering column, by the drivers feet, there is a panel. Remove it to get access to the relay panel (just a couple of torx screws, no breakable clips as far as I can remember). Remove the "double size" relay (probably marked 210-211). Put a wire between the terminals 50E and 50F. This will hotwire the immobilizer and make sure that it always activates when turning the key.

Drive around with the wire in place instead of the relay for a while to see if this helps. If it does you'll know that the problem is related to the alarm system. Keep in mind that you will be without alarm and therefore probably also without remote central locking while doing this.
Make sure that the wire is connected firmly enough so it doesn't come loose. You can also put a fuse on it if it makes you sleep better at night ;)

Good luck!

Posted on Jun 27, 2009

  • 60 Answers

SOURCE: 1993 Volvo 850 fuel issues

it is the fuel pump for sure. If you can hit the tank and get it to run it is the pump. this drain back (hard start after sitting) is a fuel pump issue as well

Posted on Nov 24, 2008

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My 1995 volvo 850 turbo is hard to start when hot.


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1993 Volvo 850 fuel issues


it is the fuel pump for sure. If you can hit the tank and get it to run it is the pump. this drain back (hard start after sitting) is a fuel pump issue as well

Nov 24, 2008 | 1994 Volvo 850

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