Engine 'carbon cleaning'

[stuart bowes]

not checked MAF yet but definitely going to. Filter changed last week so I know that's not an issue

I'll stick a couple of bottles of cataclean in the shopping basket, it cant hurt I guess always worth trying the cheap quick easy stuff

[stuart bowes]

can anyone confirm part number for correct MAF please

VIDA is lying to me, it reckons this:


but actually should look like this

would prefer to try and find a Bosch as advised earlier

this is just in case I need a new one or feel like taking a punt

car is wrong way round on drive and cant be arsed with climbing through the hedge to get to the bonnet, I'll check what mine is tomorrow

[stuart bowes]

checked in car

MAF sensor is marked: Volvo 9202199 / MB197408-0040 - Denso (made in spain) 010528

yet to check live readings it still could be totally fine

[stuart bowes]

diagnostics time

anyone care to cast an eye over this lot and tell me if anything seems out of whack..

firstly whatever this is worth I dont seem to be misfiring (would probably have felt it anyway if I was)


here are various sensor readings while on the driveway (not under load)

at idle:


at 1k (ish)


at 2k (ish)


at 3k (ish)


at 4k (ish)

[stuart bowes]

figures for air flow g/s are vastly less that others I've seen here but not sure if I should totally discount those because they were T5 readings i think and therefore surely must be sucking in easily twice as much air

is there somewhere in VIDA where i should be able to look up expected values?

[cheshired5]

Originally Posted by stuart bowes

anyone care to cast an eye over this lot and tell me if anything seems out of whack..

If you click on a value then click description, a window will pop up with an explanation of many individual values and what to expect.

[stuart bowes]

ah. ok I'll give that a go cheers

I am wondering why fuel trim is consistently (albeit only a little) different on 1 and 2 to on 3,4 and 5

[stuart bowes]

ok it was a little less informative than I was hoping for but then I guess this stuff is usually looked at by them what know what they are doing of

anyway... apparently 4g/s at idle is about normal, so I suppose I'm a bit under that? then again what do they think of as a normal idle speed. I'm happy my MAF sensor is working ok unless anyone comes along and disputes that

fuel tank pressure is about 0.2 bar (15.08hPa) which is about normal according to a basic google search so I'm assuming I dont have a leak? well I would smell it anyway I suppose

manifold pressure reading around 380hPa which is around the 'normal' 400 advised by google. So probably no vacuum leak?

I've read somewhere injectors have a +/- 0.5 acceptable tolerance so I'm happy mine are ok (well within that)

TLDR: not finding anything untoward from the sensors

next step, 2 doses of catclean.

also I think I'll do a long journey and use up £20 on the motorway to see what mpg that returns. it may just be that there's a lot of speedbumps on my daily urban adventures thus more slowdown / speedup than those who get closer to 20 (i'm seeing 18.4)

[davebb]

Hi stuart
Look for any air leaks between the MAF and the throttle body, if you think the reading is a bit low,
or you could sell it on for a £1000 or so and get a euro 3, 163 D5 This will do around 50 mpg,
Dave

[stuart bowes]

lol I'll bear it in mind if I fancy making a loss of about 6 grand