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2004 XC90 T6 CEL misfire codes very rough idle Topic is solved

Help, Advice, Owners' Discussion and DIY Tutorials on Volvo XC90s. The XC90 proved to be very popular, and very good for Volvo's sales numbers, since its introduction in model year 2003 (North America).
xavif310
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2004 XC90 T6 CEL misfire codes very rough idle

Post by xavif310 » Wed Mar 29, 2017 12:18 am

Hello, I have a 2004 Volvo XC90 T6. with 100k miles. The CEL is blinking. Checked codes and shows misfire in 1,4,6. I changed, coil packs and same. I changed the spark plugs, same. Changed injectors and same problem persist. If I let it idle, it sounds really rough. I dont know where else to check. Thank you
Last edited by matthew1 on Wed Mar 29, 2017 10:41 am, edited 1 time in total.
Reason: No "Help" in titles please. Edited title.

cuhfs
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Re: 2004 XC90 T6 CEL misfire codes very rough idle HELP  Topic is solved

Post by cuhfs » Wed Mar 29, 2017 6:12 am

MAF ?? or Vacuum Leak?? Just throwing out some ideas
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98 V70 Manual Trans
01 C70 Manual Trans
03 XC70 Auto
04 C70 Auto
06 XC90 Auto (ORE)
96 850 Wagon Manual Trans (parts car)

xavif310
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Re: 2004 XC90 T6 CEL misfire codes very rough idle

Post by xavif310 » Thu Mar 30, 2017 12:19 am

Is there a certain procedure to check the MAF? Also, how would i go about performing a vacuum leak test? aside from visually inspecting. Thank you

cuhfs
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Re: 2004 XC90 T6 CEL misfire codes very rough idle

Post by cuhfs » Thu Mar 30, 2017 8:54 am

First...all advice below... is at your own risk since I have not done them on the XC90... but here is what I have done on my other cars to test MAF. Unplug it and if car runs the same then it is the MAF thats bad.

Vacuum lines Start with visual and audible for the vacuum lines. There are ways to test vacuum with a tester or with smoke or with carb cleaner spray but you would have to research those yourself (youtube) or maybe someone else could weigh in on that stuff... and you decide if that's what you want to do. With carb cleaner I believe if you spray by a leak car will run better or worse for that second while the spray is there hence indicating a leak.
95 850 Sedan Auto Trans
98 V70 Manual Trans
01 C70 Manual Trans
03 XC70 Auto
04 C70 Auto
06 XC90 Auto (ORE)
96 850 Wagon Manual Trans (parts car)

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