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940 N/A wagon rough running 900

posted by  Griff951 on  Mon Sep 16 09:53 CST 2019
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Hi all,
Just started encountering a strange problem. I have a 1993 940 n/a Regina wagon. Thought I had a bad plug wire but it turned out to be screw on cap came off in the boot. Picked up wires/plugs at the local parts store and found out the cap was stuck in boot. Wire looked good so I used the old ones as the new one would not seat into the Regina distributor well. I used old wires, put in new NGK plugs and changed air filter.
Now when car is in park it idles decent but when in drive and engine is under load idle is erratic and it seems like I have a miss at idle and at speed. If engine is revved in park there is no miss and it sounds fine. Checked and I don't think I knocked off a vacuum line but can hear a slight hissing sound. Car ran fine before I messes with it other that loose plug lead. Ant idea what I should check next?
Thank you,
Joel








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    940 N/A wagon rough running 900

    posted by  MrNabisco on  Mon Sep 16 12:22 CST 2019
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    last visit: Wed Oct 22 12:36 CST 2014
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    The first thing I would do is swap in new OEM genuine Volvo spark plug wires. And probably Volvo plugs too. Yes, pricey, but it makes a difference.

    You may have an errant short in the wire system.

    Hissing may be a vacuum line off... ??? Check the vac line to the fuel regulator.

    Good luck.








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      940 N/A wagon rough running 900

      posted by  Blindboy on  Mon Sep 16 13:31 CST 2019
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      last visit: Tue Oct 21 17:56 CST 2014
      [RELATED]

      TraceALL the vac lines,,to the heater control,that shuts hot water off to heater.The emissions charcoal canister etc look at the diagram for vac lines,,,replace the throttle body gasket,,the throttle shaft o rings,,clean the throttle perfectly







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