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Topic: Diconnecting MAF Sensor ? (Read 773 times) |
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lesterlad aka Rodders
Full Member
2.3 Ghia x Estate (Manual)
 
Posts: 877
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Diconnecting MAF Sensor ?
« on: Aug 18th, 2010, 6:37pm » |
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Can anyone advise me as to what should happen with engine rev's if the MAF sensor is disconnected ?
I have unplugged the MAF when engine is hot and cold but there is no noticeable change in engine revs when I do this.
I have developed a tiny problem at tickover, the revs increase by approx 50revs every second then drop back again to 950.
Just wondering if the MAF is kaput.
If I switch the aircon on the revs remain rock steady (non cc)
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There's are methods to my madness!!! I'm not sure what the methods are but there's definitely madness in them
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gozz
Senior Member
Been around awhile
Posts: 3475
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Re: Diconnecting MAF Sensor ?
« Reply #1 on: Aug 18th, 2010, 7:35pm » |
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Sounds like a mucky idle valve Rodders,if you unplug the MAF when it's idling,absolutely nothing happens to the revs I have found.
GOZZ.
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Mike H
Senior Member
Renault Clio
Posts: 2594
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Re: Diconnecting MAF Sensor ?
« Reply #2 on: Aug 21st, 2010, 10:59am » |
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That' right it shouldn't, it just allows the computer to use closed-loop fuelling (compare input and output gasses); if discconnected forces it to resort to open-loop fuelling. Apparently it does that anyway until everything is warmed up.
As a matter of interest I had a little bit of erratic idling speed after I'd put on a new MAF and filters and the new exhaust, sometimes be >=1,000 rpm, another time, normal, but has since settled down to consistently normal. Could be the PCM needs time "re-learning" the new conditions. (?)
Have you disconnected the battery recently?
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Mike H
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lesterlad aka Rodders
Full Member
2.3 Ghia x Estate (Manual)
Posts: 877
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Re: Diconnecting MAF Sensor ?
« Reply #3 on: Aug 21st, 2010, 5:02pm » |
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on Aug 21st, 2010, 10:59am, Mike H wrote:
Have you disconnected the battery recently?
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Battery has never been disconnected ever since i have had the car (21/2 yrs)
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There's are methods to my madness!!! I'm not sure what the methods are but there's definitely madness in them
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Mike H
Senior Member
Renault Clio
Posts: 2594
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Re: Diconnecting MAF Sensor ?
« Reply #4 on: Aug 23rd, 2010, 11:43am » |
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I just wonderred whether the PCM had lost its memory 
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Mike H
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lesterlad aka Rodders
Full Member
2.3 Ghia x Estate (Manual)
Posts: 877
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Re: Diconnecting MAF Sensor ?
« Reply #5 on: Aug 23rd, 2010, 7:48pm » |
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I'm going to try Gozz's suggestion, (Idle valve), I need to locate a known good one first, I don't want to start messing and taking things to bits that use electrickery or knowing my luck I'll end up with a non runner and then we get into the realms of withdrawal symptoms. 
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There's are methods to my madness!!! I'm not sure what the methods are but there's definitely madness in them
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gozz
Senior Member
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Posts: 3475
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Re: Diconnecting MAF Sensor ?
« Reply #6 on: Aug 23rd, 2010, 8:10pm » |
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Rodders.
I sometimes need to clean mine when the engines start 'hunting',take it off and give it a good blast of carb cleaner and a shake,then a drop of light oil on the spindle.
GOZZ.
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tonyboy
Full Member
black2.924Vcoss ( No More )
  
Posts: 998
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Re: Diconnecting MAF Sensor ?
« Reply #7 on: Aug 23rd, 2010, 8:12pm » |
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Do you replace the gasket , or use a silicone gasket 
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I think i'm going, erm what do you call it..... Senial....
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gozz
Senior Member
Been around awhile
Posts: 3475
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Re: Diconnecting MAF Sensor ?
« Reply #8 on: Aug 23rd, 2010, 10:20pm » |
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tonyboy.
They have O ring seals.
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Tompion
Administrator
1997 2.3 Ultima estate.
Posts: 2918
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Re: Diconnecting MAF Sensor ?
« Reply #9 on: Aug 23rd, 2010, 10:22pm » |
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The 2.3 has a figure of 8 rubber gasket set into the manifold. They seem to stay flexible I usually leave it in place & give it a wipe of grease.
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ABS multiplug wheel sensor pins MK IV or MK 20
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lesterlad aka Rodders
Full Member
2.3 Ghia x Estate (Manual)
Posts: 877
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Re: Diconnecting MAF Sensor ?
« Reply #10 on: Aug 23rd, 2010, 10:23pm » |
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on Aug 23rd, 2010, 8:10pm, gozz wrote:Rodders.
I sometimes need to clean mine when the engines start 'hunting',take it off and give it a good blast of carb cleaner and a shake,then a drop of light oil on the spindle.
GOZZ. |
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Ah, Hunting, that's the word I was rattling my old grey matter to try and remember, that's what it's doing but only very slightly (50 revs every second)
Tonyboy has a good point there, new gasket or some silicon gasket in a tube ?
edit:
already answered above (I'm a slow typer) 
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There's are methods to my madness!!! I'm not sure what the methods are but there's definitely madness in them
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gozz
Senior Member
Been around awhile
Posts: 3475
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Re: Diconnecting MAF Sensor ?
« Reply #11 on: Aug 23rd, 2010, 11:04pm » |
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Rodders.
I thought you wrote "a slow type" for an instant,they are confined to the Fens,it is not wise to be slow in Leicester,you know,the quick and the dead etc
GOZZ.
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