V60 CC 2.4 D4 autobox problem

[gianmarko]

"Start with the basics."

yep, thats very sound advice...

btw, here in Switzerland is almost impossible to buy spares, even just something as simple as a filter. Shops will sell only to garages, and the only ones who will sell anything are the official dealers, but prices are eye watering.

So anything has to be ordered online. i use mister-auto, that seem to have quality spares. but there is always the risk a part is wrong and then getting it replaced takes ages (and money)

i lived couple years in sweden and i still have fond memories (and many tools) from Biltema...

Originally Posted by Kev0607

Not necessarily. It depends what service the car had. Some services include a fuel filter (full service), some don't (interim). You may get a surprise when you change it...

Start with the basics. A fuel filter is cheap.

[gianmarko]

so quick update
at the end problem does not seem autobox, luckily, but engine

DTC shows this error: P02AC00 but no description of it

i found this thread and the guy describes >exactly< the same problem i have and exactly on the same type of car and engine

https://forum.volvoklub.cz/viewtopic.php?t=76537

however this is in an alien language and not sure about the translation. Is he saying it was the MAF?

Does in your opinion cleaning the MAF makes any sense at least for troubleshooting purposes?

[Kev0607]

From what I can gather via translation, I think he swapped the MAF from another car he had (XC70) into his V60 and the engine didn't jerk. Then he knew it was a MAF fault, so as opposed to cleaning it, he purchased a new MAF sensor to go into the V60.

Another guy said he had a similar problem and it was an injector issue...

[gianmarko]

i cleaned the MAF with a specific product and things seem to have improved. but need to do longer drives. So it could be the MAF after all.
Is not superexpensive so i could try a swap.

[gianmarko]

Further update
MAF cleaning did not solve the issue of engine stutter.
So there are two issues.

- autobox sometimes, at very light throttle and low speeds, seems undecided if to shift up to higher gear and does 4-5 attempts in fast sequence, hence the judder. That is solved by NOT using the eco theme... i know is a funny thing but i am now 100% positive that changing theme changes shifting strategy and throttle response and who knows what else. btw car is a lot nicer to drive in "elegance" or performance modes.
using other themes the autobox will shift gear differently and not try to go to ridicolously high gear at ridicolously slow speed and rpm.

- engine stutter around 2000rpm and light throttle. can be easily reproduced by setting cruise at 115-120kmh and when going slightly downhill. it more or less always does it. annoying as motorway speed limit here is 120.
Today the ECM spat a P02AC(00) error code which seems to point to a bad injector #5 and that by some research seems to be a possible cause of the stuttering. i dont remember where but i think i saw this mentioned. thats beyond my workshop capabilities, i will check eventually the connector.

I actually had a similar problem on my 159 N.1, the connector of injector #5 was close to the aircon tube, and a lot of moisture accumulated there. that led to a corroded connector and to some crazy malfunctions to the point where the car would be undriveable. especially funny was the fuel indicator going crazy when it happened...

[Kev0607]

Originally Posted by gianmarko

Further update
MAF cleaning did not solve the issue of engine stutter.
So there are two issues.

- autobox sometimes, at very light throttle and low speeds, seems undecided if to shift up to higher gear and does 4-5 attempts in fast sequence, hence the judder. That is solved by NOT using the eco theme... i know is a funny thing but i am now 100% positive that changing theme changes shifting strategy and throttle response and who knows what else. btw car is a lot nicer to drive in "elegance" or performance modes.
using other themes the autobox will shift gear differently and not try to go to ridicolously high gear at ridicolously slow speed and rpm.

- engine stutter around 2000rpm and light throttle. can be easily reproduced by setting cruise at 115-120kmh and when going slightly downhill. it more or less always does it. annoying as motorway speed limit here is 120.
Today the ECM spat a P02AC(00) error code which seems to point to a bad injector #5 and that by some research seems to be a possible cause of the stuttering. i dont remember where but i think i saw this mentioned. thats beyond my workshop capabilities, i will check eventually the connector.

I actually had a similar problem on my 159 N.1, the connector of injector #5 was close to the aircon tube, and a lot of moisture accumulated there. that led to a corroded connector and to some crazy malfunctions to the point where the car would be undriveable. especially funny was the fuel indicator going crazy when it happened...

Injectors can cause all sorts of issues, including erratic shifting and stuttering. This was mentioned on the last page of this thread.

Check the injector wiring. Do a leak back test on the injectors to see which injector is faulty. It sounds like number 5 may have an issue, but there could be others. Its best to double check them all.

[gianmarko]

i did check the wirings, they look pristine.

ok i just have a few small plastic bottles i do not need :-) to build a leak back test rig.

I notice another thing today while driving and experiencing the stutter, the istantaneous fuel consumption indicated on the dash goes up from 6ish to over 9ish lt/100km then goes back down when stutter stops

Originally Posted by Kev0607

Injectors can cause all sorts of issues, including erratic shifting and stuttering. This was mentioned on the last page of this thread.

Check the injector wiring. Do a leak back test on the injectors to see which injector is faulty. It sounds like number 5 may have an issue, but there could be others. Its best to double check them all.

[gianmarko]

back from the garage. they replaced one injector they said was faulty.
engine is now quieter (a lot less clanking noises when under load at low RPM) and i think fuel consumption is down

but the misfiring is still there :-( not as bad but still there.
unfortunately takes driving on motorway a good while to have the conditions for it to happen.

so maybe there were two problems... and one is still standing. misfiring was really bad when i brought the car in, almost undriveable.
hope we are not getting in the "randomly replace things" situation...

i noticed again that when the misfiring happens instantaneous fuel consumption and dpf temp go up.

no idea what could cause that.

the XC60 D5 loaner i was driving while my V60 was in the garage ran perfectly, and smoother gear changes.

[Adam1961]

Hiya,

The most common issue I've seen on the trusty ol' 5CYL is the TMAP sensor going bad.

Seen this cause lack of power, jerking, EML etc.

Rarely on this engine is it anything to do with the EGR or gearbox.

A quick way to check is to see what you boost values are.

In VIDA there is a option for Boost Desired and Actual. These should follow each other closely even with the engine off. If they're different, fit a new TMAP sensor and go from there.

Hope this helps!

[gianmarko]

Hi Adam
thanks
i suppose that is the sensor on top of the inlet manifold, close to the MAF

i cleaned it a couple times because it was very crusty

i just logged a ride with carscanner and desired and measured boost seem to be very consistent

will post the graph later

i could just replace that, is not expensive.

what i see often is the O2 sensor disconnecting, but dont know whether that is the cause of is caused by the misfiring
i have posted a graph on another thread

https://www.volvoforums.org.uk/showthread.php?t=342700

Originally Posted by Adam1961

Hiya,

The most common issue I've seen on the trusty ol' 5CYL is the TMAP sensor going bad.

Seen this cause lack of power, jerking, EML etc.

Rarely on this engine is it anything to do with the EGR or gearbox.

A quick way to check is to see what you boost values are.

In VIDA there is a option for Boost Desired and Actual. These should follow each other closely even with the engine off. If they're different, fit a new TMAP sensor and go from there.

Hope this helps!