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> poor mpg; general opinions..., lambda probe..?
dante giacosa
post 28th November 2017 09:41
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Hey-

Now that all the major car-threatening work is behind me, I've started to actually notice what it's like to live with the 146.gif on a daily basis; and something I've found is the reasonably rubbish economy.

I'm rocking the 1.8 CF2 and it's giving about 63 miles to every 15 litres of fuel around the town (and that's not supermarket fuel). That works out to be a fairly crap 19 mpg. I'm astonished by this as I would have expected a bit more.

Now, don't get me wrong- 'what do I want from a 17 year old Italian car, with 104K on it..?'

well, I want it to run well, I suppose. The economy doesn't bother me really- it's not a deal breaker; I don't find myself wondering about a buying a Vauxhall Corsa or anything- but I do wonder if its indicative of 'something'...

The fumes do suggest that it runs a bit rich, but it doesn't use oil at all, or smoke or do anything strange- indeed it's the best running car I've ever had!

But I wonder what I'm missing- it got though the MOT no problem, for instance.

I wonder, in terms of 'replaceable parts' if swapping the Lambda probe for a brand new Alfa Romeo one (at some expense, I daresay) would make a difference?


What d'ya think, team..?
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Francophile69
post 28th November 2017 15:30
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I'd expect better than that. I manage 30-33 mpg on a 2.0l with more miles.

Yes Lambda would be my first guess but seeing you passed the emissions I'm not sure!
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Yellow 145
post 28th November 2017 22:00
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Suggest usual checks
Maf , lambda, plugs , coil packs , air filter I get about 25 around town
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dante giacosa
post 29th November 2017 00:01
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Thanks for that, lads

I've got the first service, under my ownership, coming up on Monday.

spark plugs are included- I'll look into the Lambda cost in the meantime
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dante giacosa
post 5th December 2017 13:41
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well,

new plugs- £90, and a Lambda sensor £77 later, the car is serviced- amongst other things too, of course.

So the watch on fuel economy begins!
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Francophile69
post 5th December 2017 13:55
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Good luck!
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dante giacosa
post 6th December 2017 11:43
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thankyou!

sitting in traffic for an hour and a half yesterday can't have helped, I suppose...

maybe it'll be the 'next' tank, before I find out...


it certainly seems to 'slightly' more initial-response, when pulling away...
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Ganz
post 10th December 2017 21:51
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Get the Fiatmultiscan diagnostics on it to see if something is a miss. I only ever had horrendus mpg when my 147 ran on 3 cylinders. One of my ignition coils packed in. Was literaly getting around what you are getting.


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dante giacosa
post 4th June 2018 09:37
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Just bringing this thread back from the dead...

Recently, further to my poor mpg, I've noticed the revs 'moving' a bit when pulling up at junctions.

The car doesn't stall or anything, and if I had the stereo on and was looking out of the window, I probably wouldn't notice it- but it does seem to periodically 'drop' and then save itself on a repeating cycle...


So, I've had new plugs, and a new Lambda, and I'm already coming up on the MAF as a likely offender for the rich running, but it doesn't seem relevant to the wandering revs issue?

I'm wondering if the Idle Control Valve could be involved? Is this on the back of the throttle body?
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Harpo
post 4th June 2018 16:11
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Are you still getting 19 ish mpg?
That canít be right surely?
I would find a recommendation for an engine tuner to look at the running. Once fixed, his fee will be regained from increased mpg and a bit more pep!
Sorry I canít suggest what could be at fault. My knowledge stops at points and plugs.
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dante giacosa
post 4th June 2018 20:57
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thanks Harpo,

I might ask my specialist Alfa place to do that, but; it passed the MOT (on emissions), so it's hard to get them to accept it as a genuine problem!

The mpg doesn't bother me, it's just that I feel it's running too rich- I can see liquid dripping from the exhaust, even when the car is warm.

Tomorrow night, I'm going to take 'some stuff' to bits and have a look at what is going on...

This post has been edited by dante giacosa: 5th June 2018 08:02
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shpuncik
post 4th June 2018 21:26
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You can disconnect MAF and see how car behaves with it unplugged - it will throw you check engine light, will go to limp-mode but if it feels/drives better then most likely your MAF is faulty.

Yes, idle valve is on throthle body and if it or throthle body is dirty or sticking it could cause erratic idle.
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dante giacosa
post 5th June 2018 08:10
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Thanks Valdas-

I'll have a look tonight
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dante giacosa
post 7th June 2018 09:16
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hmm, well initial investigations have revealed 'not much'.

The MAF 'appears', from what I can see into it, to be pretty clean. I think i'll need to get the security headed-torx bits to remove the sensor itself from the 'tunnel' to examine the hot wire element- as I just can't see it in position (even removed from the car)

I'm considering dismantling the ECU / throttle body, but it's appearance is somewhat 'unfriendly' to dismantling- and the throttle bypass valve (ICV?) appears well hidden on the opposite side.

I did however, get a couple of pictures looking into the throttle and it seems pretty clean to me- But what do I know..!? Pics attached...


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