Hi Folks,
2008 LR2 3.2 with multiple misfire.
5 codes
P0300, P0301, P0302, P0305, P0306

When I look at individual cylinders with CPTR....None show enough misfires to set a code? I don't get it?

Starts a bit rough from time to time and stumbles every now and then.
I clear codes and it runs great for a couple days and right back with a CEL and random driving impairments.

I've replaced air filter and cleaned MAF sensor. I have a decent scan tool that will read live data.

Some of the data from snapshot:
P0300
Fuel system 1 and 2 both CL
calculated load value 38%
engine temp 188
fuel rail pressure 381kPa
intake map pressure 49kPa
rpm 1088
speed 2mph
timing advance for cyl 1 23.5
intake air 55
air flow rate Maa Air Flow 11.4
absolute throttle position 16.5%
time since engine start 1785 sec
commanded evap purge 0.0%
fuel level input 53.7%
Barometric Pressure 101kPa
control module voltage 14.00V
Absolute Load value 33.3%
Fuel/Air Commanded Equivalence ratio 1.054
Relative throttle pos 7.1%
ambient air temp 41
Absolute throttle B 32.9%
Accelerator pedal position D 24.78%
Accelerator pedal position E 25.9%
commanded throttle actuator control 23.9%

I need to get this problem resolved so I can move on to the 8 million other projects I have to complete.
Thanks for any help you may be able to provide.
Best
Kevin

 

How many miles? Ever replace your spark plugs?

It being that long after engine start(based on your freezeframe data) you aren't looking at a software issue that is common with these throwing misfire faults, so most likely something physical, and ignition is where I would start.

 

110K
Just got it. Sharp vehicle...runs beautifully otherwise.
CrankPS and multi misfire were codes that existed.
Replaced CPS and figured it was done with engine light.
2 days later back with multiple misfire. no more cps code

I'm gonna pop coils and have a look at plugs in a bit. Any recommendation on replacements?
OEM a must?

 

Kevin,

For spark plugs I installed

6x 5344 Denso Iridium Spark Plug. Part # IKH20

And I haven't had any misfire problems (installed at 50,000 now at 100,000 miles)

Thanks for reminding me I need to change them again


https://landroverforums.com/forum/lr...lug-gap-76767/



Do you know what your fuel trim is?

The reason that I ask is that the fuel pressure looks good (55 psi) but remember that this is the pressure that the fuel system thinks is correct.

if the fuel pressure sending unit is out you could be getting a lean misfire.

The Volvo forums have some information about this (the 3.2 in the LR2 is a Volvo design) the interesting thing is that they recommend buying the fuel pressure sending unit for the LR2 because its the same part but cheaper.

Good Luck

Paul

 

Light has been off for 3 days. Came back on today after a hot restart. Plugs didn't look too bad but new ones are on order. Drive ability not really bad? But sputters only on start and stalls from time to time(again only on start). Other times...no problem at all.
Couple things I've noted...Sometimes while backing up, the sensor alarm sounds constantly (randomly) sometimes it works fine.

Also a few times I've exited the vehicle and I can hear something running under the drivers rear tire. Fuel Pump or Suspension Air Pump I'm thinking.
One time it shut down on its own and another I had to start and shut the vehicle to make it stop.
Also when I get in and start/shut off. I hear clicks from center console/passenger floor area.
Not sure of the above has to do with anything, just trying to be observant as possible so I can let the wife drive this without me worrying.
P0300 P0301 P0302 P0305 P0306
Here is todays capture data:
P0300
Fuel System 1 and 2 CL
LOAD Value 43.1%
Engine Coolant Temp 185
Short term bank 1 7.8%
Long term bank 1 2.3%
Short term bank 2 15.6%
Long term bank 2 2.3%
Fuel Rail Pressure 381 kPa
MAP Pressure 54.0 kPa
RPM 1483
Vehicle Speed 6 mph
Timing Advance for #1 cyl 22.5 degrees
Intake air temp 69 degrees
Air Flow from Mass Air Flow Sensor 17.78 g/s
Absolute Throttle Position 18.4%
Time since engine start 88 sec
Commanded Evap Purge 47.1%
Fuel Level Input 47.8%
Barometric Pressure 100 kPa
Control Module Voltage 14.08V
Absolute Load Value 37.6%
Fuel/Air Commanded Equivalence Ratio 1.046
Relative throttle position 9.8%
Ambient Air Temp 48 degrees
Absolute Throttle Position B 34.5%
Accelerator Pedal Position D 23.1%
Accelerator Pedal Position E 24.3%
Commanded Throttle Actuator Control 27.1%

New Plugs in the next couple days..
Any way to tell if I have the software updates?
Also I will try to learn how to test the fuel pressure sending unit.

Tnx
Kevin

 

Kevin,

Your fuel trims are slightly elevated but not enough that I would look at the fuel system without first replacing spark plugs.

What you know so far

P0300 random misfire

P0300X where x is the cylinder (1, 2, 5, 6)

Cylinder 3 and 4 are not misfiring

i need to search the volvo forum is this is relevant (i'll post here if i find something)


I did have a similar problem to yours

- rough idle after hot restart

- delayed start after pressing the start button

- one time the interior electrics did not work at all (engine started but no instrument cluster or navigation etc.)

- evaporate pump or fuel pump running after engine is shut off

- clicking relays


Here is what I did

1. charged the battery using a charger (disconnected battery first)

2. verified the battery state of charge using a hygrometer to confirm that the alternator is working (only works if you have wet cells not glass mat style) if you have a glass mat battery then you can use the voltage level

3. replaced all of the mini blade fuses in the engine compartment and in the passenger compartment (none were broken but all were corroded which is why I replaced them)

4. Replaced three relays in the engine compartment (i'll post tomorrow which three)

5. Stopped allowing the car to hot soak with the key docked (If I do my LR2 will run rough and misfire unless I shut it off and undock the key and complete the normal starting process) Note: I didn't fix this problem I just stopped doing the behavior that caused it.

Based on what I've read #5 can also be fixed with a software update but I am not able to confirm this.

Good Luck

Paul

 

Kevin,

I replaced the three relays shown in the picture (highlighted with a red square)

Top left relay is R1 - starter motor relay

Next to R1 is R2 - this relay provides the power for several circuits in the passenger compartment fuse box

On the right is R7 - this relay provides power for several fuses in the passenger compartment.

Also I attached a picture of one of my fuse's to show the corrosion

I am very curious to know what works for you.

Thanks

Paul

 

Encouraged to have some things to try. Plugs should be in tomorrow. I'll pull some fuses tonight and have a peek. Thanks a bunch for your replies. Will advise as soon as I have some info.

Best
Kevin

 

Kevin,

Here is what I found from Volvo with respect to

5. Stopped allowing the car to hot soak with the key docked (If I do my LR2 will run rough and misfire unless I shut it off and undock the key and complete the normal starting process) Note: I didn't fix this problem I just stopped doing the behavior that caused it.


2008 VOLVO S80 | Safercar | National Highway Traffic Safety Administration (NHTSA)


Manufacturer: VOLVO CARS OF N.A. LLC.
SUMMARY:
VOLVO IS RECALLING MY 2008-2010 S80, MODEL YEAR 2009-2010 XC70 AND MODEL YEAR 2010 XC60 VEHICLES. UNDER CERTAIN CONDITIONS THE SOFTWARE WITHIN THE CENTRAL ELECTRONIC MODULE (CEM) MAY NOT SEND A SIGNAL TO THE FUEL PUMP ELECTRONIC MODULE (PEM). THIS MISSING SIGNAL TO THE PEM INHIBITS THE START OF THE FUEL PUMP. THE DRIVER MAY BE ABLE TO START THE ENGINE IN SPITE OF THE FUEL PUMP NOT BEING ACTIVATED DUE TO RESIDUAL PRESSURE IN THE FUEL SYSTEM. IN SOME CASES, THE DRIVER MAY BE ABLE TO DRIVE THE VEHICLE A SHORT DISTANCE AT IDLE BUT THEN THE ENGINE MAY STALL.
CONSEQUENCE:
IF THE VEHICLE STALLS IN CERTAIN CONDITIONS, A CRASH COULD OCCUR.
REMEDY:
DEALERS WILL DOWNLOAD SOFTWARE TO THE VEHICLES' CEM FREE OF CHARGE. THE RECALL BEGAN ON SEPTEMBER 30, 2009



Note: this is exactly what my LR2 does if I hot soak it with the key docked

Good Luck

Paul

 

The hot-start issue these had should have been taken care of with the P010 recall, which is new software for the PCM.

Is your issue only at hot-start?

There was also an issue with BCM software that would cause the fuel pump to only prime, and then cut off, which caused a stall. However, seeing as yours doesn't always stall, this should not be your issue.

Check your brake booster vacuum pump for an oil leak. I have seen several of these leak to the point that the main engine ground gets contaminated, and after cleaning they run much better/start quicker.