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Author Topic: Rough Idle - MAF Sensor?  (Read 8634 times)

Offline philclemo

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Rough Idle - MAF Sensor?
« on: June 14, 2012, 10:22:30 AM »
Hi all,

The ongoing saga of our 2.3 Auto Mk2!

After two head gasket changes and my mis-timing on the last assembly, I have finally got the engine to have a bit go in it! Now accelerating much better and giving the driver confidence to pull you out of trouble if needed,  however, the engine is very lumpy, like it's hunting, on tickover. I have checked and cleaned the Idle Control Valve, that is working (tested by disconnecting it while the engine was ticking over and it stalled).

I then checked the MAF. On a previous fault finding spree, I checked the MAF by disconnecting it whilst the engine was on idle and the engine duly stalled. Did the same last night and nothing - no difference in tickover whatsoever, no MIL either. Is this enough evidence that the MAF is faulty, or kaput? Or is there something likely to be preventing the MAF to work perhaps?

To note, I haven't checked the MAF itself, I disconnected the battery prior to last night just to give the ECU a 'blank page' to start from but this didn't make any difference.

Cheers!

Offline Chrispb

  • Mindsaysyesbodysaysnono
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Re: Rough Idle - MAF Sensor?
« Reply #1 on: June 14, 2012, 11:03:45 AM »
Hi Phil

The 2.3's do suffer from engine wiring loom faults and because it's been disturbed several times now this may be a problem, wouldn't dis the MAF straight away as engine may be running in limp mode using basic setting.
And dare I say timing to far advanced could also give lumpy running
2009 Kia Sedona GS In Black 2.9CRDI 183PS. 5 Speed Manual WAV.
2003 MK2 Galaxy Ghia In Solid Black 1.9 TDI 115PS. 5 Speed Automatic.

Upgraded Eberspächer booster heater  to independent heating with 7 day timer.

With VCDS lite (full version) need a code clearing or want to scan for faults in the north kent area, PM me.
All for a pint of Strongbow.

The FordMPV.com Forum - The free forum for questions and answers relating to the Ford Galaxy, S-Max and C-Max

Offline philclemo

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Re: Rough Idle - MAF Sensor?
« Reply #2 on: June 14, 2012, 11:24:57 AM »
Hi Chris

Thanks for your reply. Is there a check for the MAF though? The only reason i ask is when I put it all back together after 'correcting' the timing, I hadn't connected the MAF (in error) the car fired but then stalled. I then connected it and it started fine - it was a cold engine so ran 'on choke' for a short while. It seems strange that there is no difference when I disconnect it.

Flumuxed!

Offline Chrispb

  • Mindsaysyesbodysaysnono
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  • Model: Galaxy Mk2 Auto
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Re: Rough Idle - MAF Sensor?
« Reply #3 on: June 14, 2012, 11:44:01 AM »
The general opinion says if there's no difference when unplugged then the MAF is bad but that seems to much of a coincidence, are you sure wiring is intact
2009 Kia Sedona GS In Black 2.9CRDI 183PS. 5 Speed Manual WAV.
2003 MK2 Galaxy Ghia In Solid Black 1.9 TDI 115PS. 5 Speed Automatic.

Upgraded Eberspächer booster heater  to independent heating with 7 day timer.

With VCDS lite (full version) need a code clearing or want to scan for faults in the north kent area, PM me.
All for a pint of Strongbow.

The FordMPV.com Forum - The free forum for questions and answers relating to the Ford Galaxy, S-Max and C-Max

Offline philclemo

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Re: Rough Idle - MAF Sensor?
« Reply #4 on: June 14, 2012, 11:49:25 AM »
A coincidence - I would agree, especially with the amount of disturbance it has had recently. The protective sheathing they fit over the bundles of cable I am sure could cause breaks as it is very stiff. 

Can I check the connector with a meter and are there any specific readings I should get from each terminal?

Offline Chrispb

  • Mindsaysyesbodysaysnono
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Re: Rough Idle - MAF Sensor?
« Reply #5 on: June 14, 2012, 11:59:12 AM »
I can't answer that one but I'm sure someone will.
2009 Kia Sedona GS In Black 2.9CRDI 183PS. 5 Speed Manual WAV.
2003 MK2 Galaxy Ghia In Solid Black 1.9 TDI 115PS. 5 Speed Automatic.

Upgraded Eberspächer booster heater  to independent heating with 7 day timer.

With VCDS lite (full version) need a code clearing or want to scan for faults in the north kent area, PM me.
All for a pint of Strongbow.

The FordMPV.com Forum - The free forum for questions and answers relating to the Ford Galaxy, S-Max and C-Max

Offline Mirez

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Re: Rough Idle - MAF Sensor?
« Reply #6 on: June 14, 2012, 12:46:24 PM »
I can give you the values you should expect later, I don't have the details to hand.
03 Ford Galaxy 1.9 TDI 115 Ghia in Spruce Green Metallic
With cream leather interior, Full Bodykit, Remapped at 145bhp, Lowered on 18's
06 VW EOS 2.0 T-FSI 210 Sport in Deep Black Pearl
With red leather interior with full Caractere bodykit, Remapped at 255bhp and sitting on 19's
14 VW Tiguan 2.0 TDI 177 R-Line in Deep Black Pearl
With black leather interior, panoramic sunroof and bi-xenon headlights.
08 Ford Transit 2.2 TDI 115 in Frozen White
With retrofitted everything except another slidey door! :)

VCDS HEX/CAN - Scans/Coding done in Wiltshire in exchange for winegums! :)

Offline philclemo

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Re: Rough Idle - MAF Sensor?
« Reply #7 on: June 14, 2012, 01:27:23 PM »
Well thats not good enough!!!! ;)

Okey dokey, thanks.

Offline Mirez

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Re: Rough Idle - MAF Sensor?
« Reply #8 on: June 14, 2012, 07:37:02 PM »
Right the 2.3 MAF should be:

1 = Intake Temp Signal Return
2 = Intake Temp Signal Supply
3 = Ground
4 = PCM Ground
5 = Flow Signal Supply
6 = Flow Signal Return

Therefore you should see a varying resistance when measuring between pins 1 and 2 as the ambient temperature changes. You'd also expect a resistance ranging from very high to very low between 4/5 and 6 although that may not measure without the correct supplies and ground.

03 Ford Galaxy 1.9 TDI 115 Ghia in Spruce Green Metallic
With cream leather interior, Full Bodykit, Remapped at 145bhp, Lowered on 18's
06 VW EOS 2.0 T-FSI 210 Sport in Deep Black Pearl
With red leather interior with full Caractere bodykit, Remapped at 255bhp and sitting on 19's
14 VW Tiguan 2.0 TDI 177 R-Line in Deep Black Pearl
With black leather interior, panoramic sunroof and bi-xenon headlights.
08 Ford Transit 2.2 TDI 115 in Frozen White
With retrofitted everything except another slidey door! :)

VCDS HEX/CAN - Scans/Coding done in Wiltshire in exchange for winegums! :)

Offline philclemo

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Re: Rough Idle - MAF Sensor?
« Reply #9 on: June 14, 2012, 07:39:56 PM »
Thanks ever so much Mark. I will see what I can find out.

Cheers

Offline philclemo

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Re: Rough Idle - MAF Sensor?
« Reply #10 on: July 05, 2012, 02:14:57 PM »
Well I checked what I could on the connector to the MAF. No drops in supply from what I could gather. As an aside, after checking the connector I removed the sheathing over the harness to where it joins on the main loom. The condition of the wires was very good and no signs of cracking on the insulation either.

On re-assembly I started the engine, still the same, I disconnected the MAF to see if there was a difference and it stalled! So MAF working at least. I restarted the engine with the MAF disconnected, it started but ran 'rougher', the MAF is doing it's job. Unfortunately, I had already ordered a secondhand MAF off Fleabay  ::).

It went in for it's MOT today and passed (only an advisory on front brake pads), the readings for the emissions were all well within limits (Lambda on fast idle test was 1.0 with a limit range of 0.97 to 1.3, for example). So fuel is burning correctly one would assume, which now points back to timing once again :(

If and I reiterate, IF I have another go at the timing it would mean this time for me to remove the bits I have been removing plus the lower timing cover, as I would need to get to the crankshaft sprocket to ensure the copper coloured links marry up with this and the cam sprockets. That timing cover doesn't look like a dream to remove either, as part of it sits behind one of the A/C compressor pipes. And I would have to buy another bl**dy timing chain tensioner!!!!

Humm, what to do......

Offline philclemo

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Re: Rough Idle - MAF Sensor?
« Reply #11 on: July 05, 2012, 03:09:40 PM »
Incidentally, the lumpy tickover is eliminates when on a faster idle and when the car is in motion. There is one point when driving. however, at around 1750 rpm where you can sense lumpiness. At these revs the car is generally doing 35-37 mph. Does this point to timing?

Offline Mirez

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Re: Rough Idle - MAF Sensor?
« Reply #12 on: July 10, 2012, 11:46:15 AM »
Possibly, although it could still be a coil pack/lead and/or plug. When I had my 2.3 I had a coil pack on the way out and it was lumpy at idle and ok driving although it quickly developed into a 3 cylinder :)

I've not done the timing on a 2.3 so can't comment on what needs to come off to do it right -sorry!
03 Ford Galaxy 1.9 TDI 115 Ghia in Spruce Green Metallic
With cream leather interior, Full Bodykit, Remapped at 145bhp, Lowered on 18's
06 VW EOS 2.0 T-FSI 210 Sport in Deep Black Pearl
With red leather interior with full Caractere bodykit, Remapped at 255bhp and sitting on 19's
14 VW Tiguan 2.0 TDI 177 R-Line in Deep Black Pearl
With black leather interior, panoramic sunroof and bi-xenon headlights.
08 Ford Transit 2.2 TDI 115 in Frozen White
With retrofitted everything except another slidey door! :)

VCDS HEX/CAN - Scans/Coding done in Wiltshire in exchange for winegums! :)

Offline philclemo

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Re: Rough Idle - MAF Sensor?
« Reply #13 on: July 10, 2012, 03:39:12 PM »
Hi Mark

I think I can rule out plugs as I tried it with the set I removed for it's 80k service - no difference. We had a coil pack go on the Mk1 (there are two on a Mk1), the Mk2 only has one so that is a good thing as they seem to be cheaper to replace, but if you have two you have still got a chance to get home!

 

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