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another MPG question

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Old Mar 21st, 2021, 18:43   #11
stuart bowes
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Cleaned MAF and immediately idle settled at about 800-850 ish

whereas before it was sat at 1000 all day. I suppose it goes to show there is at least some minor improvement in metering.

spark plugs due during the week (volvo branded) anyone know what the gap should be?

bottle of Wynn's chucked in and will do another bottle in a couple of weeks
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Old May 20th, 2021, 12:48   #12
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just keeping thread updated for future readers

summary of things done:
new tyres, 35psi
two bottles of cataclean
a few injector cleaners (still a few more doses left in bottle)
blocked a slight gap in airbox (not sure if made any difference)
cleaned MAF
new spark plugs

originally 17-18mpg (urban only)
latest reading 21.5mpg (urban only)

point to note urban in my case means lots of start stop traffic, lots of speed-bumps and schools on my route (people just randomly stopping on yellows to eject their little treasures) so I think that's about as good as it gets

still considering the 140-170bhp remap not for power but because I read it's actually slightly a more efficient map.. anyone think that seems likely?

still working on getting everything tip-top before i do any remapping though
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Last edited by stuart bowes; May 20th, 2021 at 14:12.
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Old May 20th, 2021, 15:17   #13
Georgeandkira
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If you're feeling frisky you might consider changing your front O2 sensor. It has all to do with fuel richness. The rear sensor has to do with catalyst efficiency.

While young in terms of mileage you're beyond the 10-12 year lifetime often cited. Is there a different "expected lifespan" for Volvo upstream sensors?

Said sensor in my '02 died after its 11th birthday. My fuel use went up 20% overnight. Seriously, I saw the fuel gauge fall faster.
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Old May 20th, 2021, 16:06   #14
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you know what, I was thinking that when I was looking at my injectors reading as +1 or so, what could be causing a slight overfuel..

that's confirmed my though process so yeah thanks I think I will do that. even 1mpg over a year will more than cover the cost
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Old May 20th, 2021, 16:13   #15
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can someone confirm which one is right

https://www.skandix.de/en/spare-part...da-sensor/621/

just thinking I might order it up while at work, if not I'll check VIDA later

there's diagnostic (post?) and regulating (pre?)
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Old May 20th, 2021, 21:51   #16
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genuine Volvo item unused, ebay, £90. boom

I'll snap that up yes please

to confirm if anyone else wondered, post above appears to be correct
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Old May 21st, 2021, 10:26   #17
Nogbad the Bad
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Can I ask please for recommendations of what to clean the MAF sensor with? The proper cleaner is really expensive, and i wanted to know if there is a cheaper alternative.

Thanks
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Old May 21st, 2021, 10:36   #18
stuart bowes
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As advised by T5R92011 on page 1 I just used electrical contact cleaner, i found one that said 'leaves no residue' - it got rid of the muck, and didn't cause any problems for me

https://www.amazon.co.uk/gp/product/...?ie=UTF8&psc=1

you need about 1/50th of the tin so spending a lot of 'proper' stuff is definitely a waste of money

and the lady at A1 auto has a simple, well explained video as usual https://www.youtube.com/watch?v=f6PRmGzF5AM
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Old May 21st, 2021, 20:28   #19
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I bought the NGK (said to be the OE manufacturer) over Volvo branded due to the gross price difference at the time. The current prices listed in the link above are much more competitive (aka sane).

Electric cleaner spray and "real MAF" spray are the same price-possibly $1 more- here (New Jersey).

I've read appeals for both the residue free cleaner and the real thing but have never seen any demonstration of one over the other.

Once blueing some metal I used electric cleaner as a final prep. The residue, which is a lubricant I believe, made the finish all rainbowed (like oil in water) and swirly....not blue.
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Old May 21st, 2021, 22:00   #20
stuart bowes
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just a 2 second google here shows MAF cleaner ranging from £6-15, and the electrical cleaner was £4? so yeah there's not a lot in it .. but because you use literally like 2 x 4 second blasts at most is it really even worth worrying about it, the rest of the tin will probably sit on my shelf unused for years. If I was running a garage or something I'd probably buy the right stuff I suppose

proof was in the pudding tbh, my sensor had crud on it, and the stuff i linked cleaned it off perfectly. the sensor hasn't thrown up a fault and the car idles lower, which I took to mean metering better. as for actual mpg improvement because of that one tiny job, well who knows

agreed full price 'proper' sensor is a rip off! If I didnt find the volvo one on ebay going cheap I probably would have tried a denso or NGK I suppose. saying that I replaced one on an old scooby and the dealship shafted me for £250 but the cheap ones I tried before (2 tries totalling about £100) didn't work, so swings and roundabouts I guess. sometimes you get a bargain .. sometimes you get a case of cheap-out and pay twice
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