IPD sale Volvo Parts

2008 XC90 3.2L V6 misfires, fuel level sensor, Cat bank 1 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).
headneophyte
Posts: 7
Joined: Wed Jan 02, 2019 5:53 pm
Year and Model: 2008 XC90
Location: KS
Has thanked: 2 times
United States of America

2008 XC90 3.2L V6 misfires, fuel level sensor, Cat bank 1

Post by headneophyte » Wed Jan 02, 2019 6:36 pm

I've been banging my head on this car for a couple months now, so lemme lead with a BIG thanks for any help.

Our 2008 XC90 with 156k miles recently had two ignition coils just burn up, explode. I replaced them with two from AutoZone they had to order in. I did the repairs on the side of the road. On the way home it ran fine except the check engine light came on. I read the codes at home and it was the 420 & 430 Catalytic codes. I thought maybe the plugs haf been fouled so I went to inspect them and they were clearly fouled badly. I decided to check the other plugs too. 5 of the six looked ate up so I decided a tune up was in order. I ordered 4 more coils and bought 6 new Iridium plugs and an air filter. With all that installed, I looked at the air flow sensor that was after the air filter. It was caked in dust so I cleaned it with a qtip with rubbing alcohol. Reassembled it ran nice!

Two days later my wife said it stuttered on the highway for a second and came up with "slow down or shift up" on the dash and the check engine light was flashed 5-6 times and went off. She was a couple miles from home so she drove it the rest of the way and the check engine light stayed off. I scanned it and it had these codes:

P0300
P0304
P0305
P0306
P0420
P0464

But there was no freeze frame data stored and the check engine light stays off. I had kept the old coils so I put them back on cylinders 2-6 as the Volvo dealer said they may not be compatible. I took it for a drive just now and it WILL stutter and throw the codes consistently in this scenario:

The car is at temperature
You've driven over 15 miles
You're going up a hill going over 65mph AND accelerating.

The car can sit in the driveway running idle for over 30 minutes and not misfire or throw these codes.

Also, the radio quit working. It powers on with the little Volvo car coming up but the screen goes blank. I've also noticed with the key in the "on" position, there is a rythmic quite thump in the right speakers. If you put your ear up to it you can hear it thump, you can hear a barely perceptible hiss, then thump and silence. This repeats every two seconds until the computer puts the car to sleep when you take the keys out.

Deus Ex Machina

Help, thx! I can provide any additional information, and I've gotten a 335 page wiring diagram for this vehicle.

*Edit* I pulled the plugs today and with less than 150 miles they are carboned up and the exhaust smells rich.

User avatar
pgill
Posts: 72
Joined: Mon Aug 27, 2018 5:42 pm
Year and Model: 2010 S80, 2008 LR2
Location: California
Has thanked: 7 times
Been thanked: 9 times
United States of America

Re: 2008 XC90 3.2L V6 misfires, fuel level sensor, Cat bank 1

Post by pgill » Wed Jan 02, 2019 10:27 pm

First post

Welcome to MVS

I own two 3.2’s

2008 LR2 3.2. 116K. Thermostat failed after removal
2010 S80 3.2. 124K. Thermostat was broken when I replaced it

No misfire codes on either one

If I were in your position the first thing I would do is replace the thermostat

The Land Rover LR2 uses the Volvo 3.2 so you can use the Land Rover part if it’s cheaper or easier to get

This link convinced me to replace my thermostat (see this link for ignition coil failures)

http://www.volvoxc.com/forums/showthrea ... -2009-XC70

Link that shows part numbers and what’s involved

http://www.freel2.com/forum/topic32245.html

And finally if you want to understand what fails then

https://www.matthewsvolvosite.com/forum ... 31&t=86205

Good luck

Paul

jimmy57
Posts: 6123
Joined: Fri Nov 12, 2010 9:25 am
Year and Model: 2004 V70R GT, et al
Location: Ponder Texas
Has thanked: 1 time
Been thanked: 120 times

Re: 2008 XC90 3.2L V6 misfires, fuel level sensor, Cat bank 1  Topic is solved

Post by jimmy57 » Wed Jan 02, 2019 10:55 pm

The replacement coils must be stronger and better able to fire plugs when the mixture is rich and harder to ignite (higher kV required to fire without fouling).
Ignore the P0464 as it is not going to cause the driveability issues. That code can set if one the fuel level sensors has a bad spot on it potentiometer surface.
P0420 should not be a focus as the mixture being wrong before it gets to the point of misfiring will cause this to set for bank 1 (cylinders 1-2-3) even though those aren't the cylinders reported as misfiring. Your heavy deposited new plugs and the misfiring are the focus as causes and the catalyst code is just an effect.
MAP sensor plugged into intake down low must be OK as it is the primary sensor for idling and low throttle opening.
There is no indication of bank specific problems so front O2 sensors are less likely to be the issue.
MAF is high on list due to being dirty and being cleaned.
Disconnect battery for at least 10 minutes as this clears all fuel trim memory and gets the ECM back to default values.
Unplug the MAF sensor and then start it and drive it and see how it runs. It will have check eng light for the MAF and will do little or no fuel trim correction. If MAF is the issue then it should run OK and not foul plugs but will have poor throttle response.

It would be great to know what the MAF value is. Torque pro for Android plus a wifi or bluetooth OBD-ii dongle is the least costly way to get more info for engine running issues. Does what you read codes with give any parameter display info? The MAF should be grams/second (g/s) and idling is 3.2 to 3.6 for a 3.2.

headneophyte
Posts: 7
Joined: Wed Jan 02, 2019 5:53 pm
Year and Model: 2008 XC90
Location: KS
Has thanked: 2 times
United States of America

Re: 2008 XC90 3.2L V6 misfires, fuel level sensor, Cat bank 1

Post by headneophyte » Thu Jan 03, 2019 7:35 am

These are both great ideas! Thanks! I will unplug the MAF when I get home tonight and take it for a spin. I may replace the thermostat also since they are usually simple repairs (and this vehicle is over 150k!).

I just remembered I took pics of the last two time it had freeze frame data!

Dec 15 data:
DTCFRZF P0420
FUELSYS1 CL
FUELSYS2 CL
LOAD_PCT 32.5
ETC 189
SHRTFT1 7.0
LONGFT1 7.8
SHRTFT2 3.1
LONGFT2 0.0
FRP 54.8
MAP 23.9
RPM 2366
VSS 71
SPARKADV 40
IAT 46
MAF 2.709
TP 21.2
RUNTM 494
EVAP_PCT 94.9
FLI 51
BARO 28.9
VPWR 14.589
LOAD_ABS 33.8
EQ-RAT 1.009
TP_R 14.1
AAT 45
TP_B 36.9
APP_D 7.8
APP_E 7.1
TAC_PCT 31.8

Dec 17 data (AFTER REPLACING ALL 6 COILS AND NEW PLUGS):
DTCFRZF P0430
FUELSYS1 CL
FUELSYS2 CL
LOAD_PCT 62.4
ETC 194
SHRTFT1 1.6
LONGFT1 5.5
SHRTFT2 0.8
LONGFT2 -2.3
FRP 54.4
MAP 26.9
RPM 2273
VSS 68
SPARKADV 27
IAT 39
MAF 5.359
TP 28.6
RUNTM 591
EVAP_PCT 94.9
FLI 32.9
BARO 28.9
VPWR 14.492
LOAD_ABS 64.4
EQ-RAT .987
TP_R 25.1
AAT 37
TP_B 42.7
APP_D 21.2
APP_E 20.8
TAC_PCT 42.7

I know the data is a little old (and I may have been braking at the time it captured the second set) but it's all I have right now.

1: Are the plugs ok to clean and if so, how? I tried wiping them down but the carbon wouldn't come off easily so I blasted them with an air compressor to make sure they were debris-free and put them back in.

2: I noticed in comparing the data sets the fuel trim is dramatically lower and the MAF is dramatically higher. No question I guess, just observations...?

headneophyte
Posts: 7
Joined: Wed Jan 02, 2019 5:53 pm
Year and Model: 2008 XC90
Location: KS
Has thanked: 2 times
United States of America

Re: 2008 XC90 3.2L V6 misfires, fuel level sensor, Cat bank 1

Post by headneophyte » Thu Jan 03, 2019 12:09 pm

Another update, I rented a compression tester and cylinders 4, 5, 6 all are around 190psi.

User avatar
pgill
Posts: 72
Joined: Mon Aug 27, 2018 5:42 pm
Year and Model: 2010 S80, 2008 LR2
Location: California
Has thanked: 7 times
Been thanked: 9 times
United States of America

Re: 2008 XC90 3.2L V6 misfires, fuel level sensor, Cat bank 1

Post by pgill » Thu Jan 03, 2019 12:20 pm

Headneophyte,

The analysis that Jimmy is recommending is very sound.

If I was doing the fault analysis I would change the thermostat first to get back to the baseline.



Let us know what the root cause is


More information

http://www.easterncatalytic.com/educati ... stic-tool/

Running too rich – High negative fuel trim corrections can be caused by MAF sensor problems, high fuel pressure, leaking fuel pressure regulator diaphragm, faulty evaporative emissions components, leaking injectors, defective O2 sensors, exhaust leaks/pinholes before the O2 sensor, coolant temp sensor problems, and base engine issues such as low compression and incorrect camshaft timing.

Running too lean – High positive fuel corrections can be traced to MAF and O2 sensor faults, vacuum leaks from intake gaskets/hoses, unmetered air (intake snorkel leak), clogged or dirty fuel injectors, fuel delivery issues, and exhaust restrictions such as a clogged catalytic converter.

Take a look at this Video for an example of unmetered air




Good Luck

Paul

headneophyte
Posts: 7
Joined: Wed Jan 02, 2019 5:53 pm
Year and Model: 2008 XC90
Location: KS
Has thanked: 2 times
United States of America

Re: 2008 XC90 3.2L V6 misfires, fuel level sensor, Cat bank 1

Post by headneophyte » Thu Jan 03, 2019 5:13 pm

I stopped and picked up a MAF sensor on the way home, just in case. I unplugged the MAF sensor and started the XC90. It ran rough but I took it out for a spin. It threw up 5 different codes, all related to the MAF being unhooked. All the misfire codes were still gone after 30 miles! When I got back home I swapped in the new MAF sensor and hit the highway. I babied it the first 30 miles up and down hills and still no codes so I opened it up on the way back and ran it around 80mph. Never threw a single code. I'm going to drive it work tomorrow which is 80 miles round trip, if it's still clear I'll mark this thread closed!

I can't thank y'all enough!

I'll also buy a thermostat tomorrow after reading through those other threads pgill!

User avatar
oragex
Posts: 3939
Joined: Fri May 24, 2013 6:20 am
Year and Model: S60 2003
Location: Canada
Has thanked: 76 times
Been thanked: 133 times
Contact:
Canada

Re: 2008 XC90 3.2L V6 misfires, fuel level sensor, Cat bank 1

Post by oragex » Thu Jan 03, 2019 5:58 pm

The thermostat on the 3.2 fails and causes the engine to overheat - the temp needle may still stay close to 12h. Consequently overheat the top of the engine and the coils (thus they may fail)
2003 2.4i S60 automatic 125k miles
DIY Volvo repairs videos https://www.youtube.com/playlist?list=P ... s0FSVSOT_c

User avatar
pgill
Posts: 72
Joined: Mon Aug 27, 2018 5:42 pm
Year and Model: 2010 S80, 2008 LR2
Location: California
Has thanked: 7 times
Been thanked: 9 times
United States of America

Re: 2008 XC90 3.2L V6 misfires, fuel level sensor, Cat bank 1

Post by pgill » Thu Jan 03, 2019 10:24 pm

That is awesome news!!!!

The thanks goes to Jimmy, it was very nice of him to explain how the system works.

Now you need to start thinking about the high mileage maintenance items

http://www.freel2.com/forum/topic32504.html

And I need to think about adding the MAF to the list

Your already thinking about the Thermostat.

If you do replace it let us know if it’s broken

Good luck

Paul

headneophyte
Posts: 7
Joined: Wed Jan 02, 2019 5:53 pm
Year and Model: 2008 XC90
Location: KS
Has thanked: 2 times
United States of America

Re: 2008 XC90 3.2L V6 misfires, fuel level sensor, Cat bank 1

Post by headneophyte » Fri Jan 04, 2019 1:37 pm

Gah! Driving home today I got P0175 and P0420 codes.

System too rich bank 2
Catalytic system below threshold bank 1

The P0175 was in there twice.

Load_pct 71
ETC 190
SHRTFT1 -7
LONGFT1 -12.5
SHRTFT2 -3.9
LONGFT2 -17.2
FRP 54.4
MAP 21.6
RPM 2063
VSS 61
SPARKADV 23
IAT 16
MAF 5.635
TP 22.7
RUNTM 1212
EVAP_PCT 0.0
FLI 34.9
BARO 28.9
VPWR 14.550
LOAD_ABS 72.4
EQ_RAT1.010
TP_R 16.5
AAT 21
TP_B 38.4
APP_D 22.0
APP_E 21.6
TAC_PCT 34.1

No misfires now, but these two new codes since replacing the MAF sensor. I drove to work around 40 miles fine, but now these popped.

Post Reply

Who is online

Users browsing this forum: No registered users and 16 guests