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2004 V70 brief hot restart rough idle V70-XC70 2004

posted by  Marlin Mangels on  Sat Mar 31 11:33 CST 2018
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last visit: Tue Oct 21 15:41 CST 2014
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My 2004 V70 AWD has a rough idle for a few seconds after a hot restart. After a couple of these episodes I get random misfire, cyl 1 misfire & cyl 3 misfire codes. Cold starts are fine & after a few seconds it runs fine. I replaced all 5 coil packs, all 5 spark plugs, and all 5 injectors but still have the problem. 205000 miles on the odometer. Any ideas what will cause this?
Marlin








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2004 V70 brief hot restart rough idle V70-XC70 2004

posted by  KlausC on  Mon Apr 2 19:14 CST 2018
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last visit: Fri Oct 24 10:15 CST 2014
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I would have given the head a Seafoam treatment rather than replace the parts, just to get rid of the carbon build up, if any.

Check the resistance for the ECT sensor, it should be in the low 200's when hot. A faulty sensor could introduce too much fuel at start up.
--
Keeping it running is better than buying new








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2004 V70 brief hot restart rough idle V70-XC70 2004

posted by  Marlin Mangels on  Tue Apr 10 08:25 CST 2018
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last visit: Tue Oct 21 15:41 CST 2014
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Resistance at 190 degrees F was 233 ohms.








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2004 V70 brief hot restart rough idle V70-XC70 2004

posted by  Marlin Mangels on  Tue Apr 3 19:19 CST 2018
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last visit: Tue Oct 21 15:41 CST 2014
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How do I do the seafoam treatment other than adding it to fuel tank? I know on the 240's we aspirated it through a vacuum hose.








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2004 V70 brief hot restart rough idle V70-XC70 2004

posted by  KlausC on  Tue Apr 3 19:50 CST 2018
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last visit: Fri Oct 24 10:15 CST 2014
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Same as the 240's, find a small vacuum hose on the front of the intake manifold and use that to 'sip' the Seafoam.
--
Keeping it running is better than buying new







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