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Topic: bad idle and the MAF (Read 1266 times) |
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Mike_Floutier
Full Member
'97 2.3 Ultima saloon lpg
 
Posts: 296
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bad idle and the MAF
« on: Nov 5th, 2007, 8:56pm » |
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Hi,
I'm just trying to sort out my poor idling and have noticed that there is no change when I disconnect the MAF with the engine idling
Is this normal or should I expect a change when disconnecting the MAF during idle?
Thanks
Mike
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Jonnycab
Senior Member
Former owner of 2.3 Ultima Facelift saloon
Posts: 3900
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Re: bad idle and the MAF
« Reply #1 on: Nov 6th, 2007, 11:44am » |
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I tried this once & also there was no difference to the idle.
The way I understand it, is without the MAF connected it will still idle because the other engine sensors will still provide enough information to the PCM for it to idle okay 
Have you tried cleaning the IACV with some carb cleaner & then applying a little lubricant to the shaft ?......although, this may not make any difference if the fault lies with the solenoid part of it
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pete from Hull
Senior Member
Non Scorpio at the moment, but still interested...
Posts: 1365
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Re: bad idle and the MAF
« Reply #2 on: Nov 6th, 2007, 12:14pm » |
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I once drove to work after cleaning the maf, the car became so irratic and jumpy I thought I'd damaged it during the cleaning operation.  After work I gingerly drove it home with the intention of changing it for my spare, I lifted the bonnet and low and behold, when I came to disconnect the maf I found I'd forgot to reconnect the multiplug.....  I reconnected it and started it up....  you guessed it, after a few seconds it ran as smooth as silk again and has ever since, I can only assume the ecu needs to learn the settings.....
hth
pete
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Mike_Floutier
Full Member
'97 2.3 Ultima saloon lpg
Posts: 296
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Re: bad idle and the MAF
« Reply #3 on: Nov 6th, 2007, 2:55pm » |
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Ok, so do I understand this correctly, in theory it shouldn't make a difference but in practice it can?
Would somebody mind disconnecting their MAF while their engine is idling to see if it does become lumpy.
That would really helpful cos my car is pretty old and I dont want to fork out for another MAF if it's not going to do the trick
Thanks
Mike
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Tompion
Administrator
1997 2.3 Ultima estate.
Posts: 2918
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Re: bad idle and the MAF
« Reply #4 on: Nov 6th, 2007, 3:23pm » |
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My 2.3 usually hesitates very slightly when I disconnect the MAF (hardly noticeable).
I just tried it with a cold engine & it stopped dead about a second after disconnecting the MAF, but I suspect it coincided with the aircon cutting in. After the engine had been running a couple of minutes, tried again a few times & just a barely noticeable hesitation.
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ABS multiplug wheel sensor pins MK IV or MK 20
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Mike_Floutier
Full Member
'97 2.3 Ultima saloon lpg
Posts: 296
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Re: bad idle and the MAF
« Reply #5 on: Nov 6th, 2007, 5:48pm » |
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Thanks for that Tompion.
Jonnycab, would you mind telling me a bit more about cleaning the IACV - eg where is it, and do I need to remove it to clan it etc - as I've no idea and I couldn't find anything about it on the site.
Thanks
Mike
PS I should also mention that I have a couple of other problems that started about the sametime as this idling problem and I was wondering if they are related or can help with diagnosis:
1. When starting the engine, the trip milometer occaisionally resets to zero and the mpg figures etc all reset to lts/100km. - This is not the same as the "low battery" syndrome where the needles all whizz round btw. and,
2. The autobox, when thoroughly warm, can only hold overdrive with the very lightest throttle - ie downhill or slowing down slightly - any more and it goes into fourth
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Simmo
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I'm an OAP !
Posts: 5508
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Re: bad idle and the MAF
« Reply #6 on: Nov 6th, 2007, 7:11pm » |
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The detail is HERE. There are two styles as you will see from the diagram. It sits adjacent to the throttle intake and ,yes, it does have to be removed in order to clean it. This is done by 'dosing' it with carb cleaner and then lubricating the moveable 'shaft' with 3 in 1 oil. You will need to replace the gasket to obtain an airtight seal on replacement. To be fair sometimes it works and sometimes it doesn't. Will try and find a photo on the site. Try reading THIS
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Mike_Floutier
Full Member
'97 2.3 Ultima saloon lpg
Posts: 296
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Re: bad idle and the MAF
« Reply #7 on: Nov 8th, 2007, 3:17pm » |
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Thanks Simmo,
I squirted about half a can of car cleaner into it and it was still coming out dark so it was very dirty.
I then lubricated the piston etc as per instructions and reassembled.
It seems to be idling a lot better. It's much steadier now at around 1,000 rpm whereas before it was hunting between 500 & 800rpm.
Will see how it settles down. The main thing is that the difference is so obvious that it must be the cause - always a relief to nail down a cause.
Thanks again.
Mike
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Simmo
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I'm an OAP !
Posts: 5508
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Re: bad idle and the MAF
« Reply #8 on: Nov 8th, 2007, 3:37pm » |
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Glad to have helped Mike. Sometimes it is a cure if not it's a replacement,preferably new, FordParts are the best and cheapest. I have the Finis Nos for both types, the 2.3 is different from my 2ltr so give me a shout if you need to go that route. Cheers MIke 
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Mike_Floutier
Full Member
'97 2.3 Ultima saloon lpg
Posts: 296
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Re: bad idle and the MAF
« Reply #9 on: Nov 9th, 2007, 9:19am » |
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Thanks Simmo,
Yes, after a long trip yesterday it's back to hunting again. I've put in a request to FordPartsUK as fiddling with it certainly made a difference, if only temporary so it looks like it's the culprit.
Will post results in due course.
Mike
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Simmo
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I'm an OAP !
Posts: 5508
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Re: bad idle and the MAF
« Reply #10 on: Nov 9th, 2007, 2:16pm » |
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Mike, the part is known as Valve Assembly-Air by-pass and the 2.3 is Finis 1058383 and the gasket 7090339. The total with postage was about £81.
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Mike_Floutier
Full Member
'97 2.3 Ultima saloon lpg
Posts: 296
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Re: bad idle and the MAF +/or IACV
« Reply #11 on: Nov 15th, 2007, 3:24pm » |
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Just another query about the IACV.
When cleaning it again today I noticed that the spring that is connected to the piston was not connected at the other end (ie to the valve body).
Do you know if this is correct or has it come loose? I guess that would maybe explain the problem.
Thanks
Mike
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Jonnycab
Senior Member
Former owner of 2.3 Ultima Facelift saloon
Posts: 3900
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Re: bad idle and the MAF
« Reply #14 on: Nov 18th, 2007, 12:54am » |
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http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=260102633824&am p;am p;fromMakeTrack=true#ebayphotohosting on e-bay.
I E-mailed this company a few months back, to enquire whether it fitted the 2.3. They replied with a no & said they could do the 2.3 one for about £85.....so same price as FMD
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Mike_Floutier
Full Member
'97 2.3 Ultima saloon lpg
Posts: 296
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Re: bad idle and the MAF
« Reply #15 on: Nov 18th, 2007, 5:04pm » |
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Hmmm, yes, I see what you mean. Can't look at my plug at the moment due to foul weather - anyway I ordered it yesterday so I'll have to wait and see.
I did speak to an FMD and he confirmed that the Finis number was the same for the 2.3 Scorpio as well as the Galaxy so hopefully it'll be ok.
Will let you know as it would be a useful source.
Mike
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Mike_Floutier
Full Member
'97 2.3 Ultima saloon lpg
Posts: 296
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Re: bad idle and the MAF
« Reply #16 on: Nov 24th, 2007, 12:50pm » |
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on Nov 9th, 2007, 2:16pm, Simmo wrote:| Mike, the part is known as Valve Assembly-Air by-pass and the 2.3 is Finis 1058383 and the gasket 7090339. The total with postage was about £81. |
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Simmo, you don't know the part no. (95GB.....) do you?
I've found a breaker who has one but he wants to know the part no. rather than the finis.
Thanks
Mike
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scorpio_man
Administrator
Ford Kuga awd
Posts: 5654
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Re: bad idle and the MAF
« Reply #17 on: Nov 24th, 2007, 1:29pm » |
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hi there
i've got it coming up as 1041963/ 96xf9f715ba.
hth
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Mike_Floutier
Full Member
'97 2.3 Ultima saloon lpg
Posts: 296
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Re: bad idle and the MAF
« Reply #18 on: Nov 24th, 2007, 7:53pm » |
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Thanks mate, that's the one. I was expecting a 95bg... no. but that agrees with what's on the side of the unit.
Thanks again
Mike
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