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Coils and Sparkplugss

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).
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skippyxc90
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Joined: Sat Nov 08, 2014 6:20 pm
Year and Model: XC90 3.2 AWD 2008
Location: United States
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Coils and Sparkplugss

Post by skippyxc90 »

My 2008 Volvo XC90, 3.2 AWD "Check Engine Light" lit up on the dashboard. It has been burning more fuel and lacking power during acelleretaion. I plugged in the Vida and pointed out the Fuel Rail Pressure Sensor. I just replaced it yesterday. So far the CEL has not pop up. My questions are:

1. Are the Ignition Coils normal? The 5th coil from the left is so dark
2. Are the Sparkplugs ok? I replaced these a year ago. The 6th plug from the left has lots of carbon
3. I also craked the locking mechanism of one of the injectors connector. Are these replaceable?

Any input will be much appreciated. Have a nice day.
Attachments
Fuel Rail Pressure Sensor2.jpg
Ignition Coils.jpg
Sparkplugs.jpg
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Roger_850T
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Joined: Tue Dec 31, 2013 11:55 am
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Re: Coils and Sparkplugss

Post by Roger_850T »

What was the issue with the fuel pressure sensor?

I would expect a fuel pressure sensor issue to affect all injectors similarly.

How long have the plugs been in? Mine had a 75k service interval, I changed them at about 80k. If it's near due, probably wouldn't hurt to change them.

Any chance oil could be leaking in to the one coil that's discolored? Is it near the oil fill to catch spillover?

Roger
'05 XC90 V8 140k
'95 854T 310k
'02 V70 159k
'03 S80 111k (crashed)
'93 945T 217k (gone to be parted out)
'87 245 300k+ sold, still going
'84 264 Diesel, RIP at 160k
'78 242 manual everything.
'73 P1800ES, fun until the rust set in...
skippyxc90
Posts: 23
Joined: Sat Nov 08, 2014 6:20 pm
Year and Model: XC90 3.2 AWD 2008
Location: United States
Been thanked: 3 times

Re: Coils and Sparkplugss

Post by skippyxc90 »

Roger_850T wrote:What was the issue with the fuel pressure sensor?

I would expect a fuel pressure sensor issue to affect all injectors similarly.

How long have the plugs been in? Mine had a 75k service interval, I changed them at about 80k. If it's near due, probably wouldn't hurt to change them.

Any chance oil could be leaking in to the one coil that's discolored? Is it near the oil fill to catch spillover?

Roger
I had a "Check Engine Light - I plugged in the Vida scanner and it suggested that the sensor is faulty - I replaced it
Those sparkplugs are less than a year old
There is no evidence that oil is leaking into the coils.

The CEL is now gone. The high fuel consumption and lack of power during acceleration are my current problem. From a full tank, I drove 85 miles (highway and city combine) the tank is now just over 50%. In short, if the tank is 21 gallons, I already burned at least 10 gallons for 85 miles.

Im exploring the possibiliy of bad:
1. Oxygen Sensor
2. MAF
3. Clogged injectors
4. Bad brake calipers
5.. Fuel Filter (just replaced when I replaced the sparkplugs)
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Roger_850T
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Posts: 289
Joined: Tue Dec 31, 2013 11:55 am
Year and Model: 854T 1995
Location: Frederick MD
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Re: Coils and Sparkplugss

Post by Roger_850T »

The brakes are pretty straightforward to check - after a drive, put your hand near and see how hot they feel. (But be careful not to touch - in case it is very hot!) Somewhat hot is normal. Extremely hot is not normal and may indicate an issue.

You might try swapping the coils to different locations. If the discolored spark plug moves, then it suggests a failing coil. If not, then coil is probably fine.

Clogged injectors - Possibly. Or possibly one with something blocked in it. You could try swapping them around, too, and see if the spark plug follows it. Or run some techron through it for a tank or two. Might but probably won't help, but it won't hurt and it might improve things.

Roger
'05 XC90 V8 140k
'95 854T 310k
'02 V70 159k
'03 S80 111k (crashed)
'93 945T 217k (gone to be parted out)
'87 245 300k+ sold, still going
'84 264 Diesel, RIP at 160k
'78 242 manual everything.
'73 P1800ES, fun until the rust set in...
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