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Joined: Dec 2009
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Tricky Dicky
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Originally Posted by Craig Jezz
Originally Posted by +8Rich
Has Craig got one you can have a loan of until Amazon recovers from the "bog roll syndrome" ? He likes his bits and bobs.


Unfortunately I don’t have a code reader Rich, but my mechanic mate has offered to plug his into SFG’s 4/4 tomorrow.

Good man Craig thumbs


2009 4/4 Henrietta
1999 Indigo Blue +8
2009 4/4 Sport Green prev
1993 Connaught Green +8 prev





SFG #625069 23/03/20 01:51 AM
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T
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T
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Get a code reader, even the cheap ones seem to work ok on Mogs. Regarding Amazon they have been absolutely inundated with orders for medications etc. Hence delay.
Just a heads up, the Ministry of Defence have been told to be on standby for a complete UK shutdown as of next Wednesday at 8.00 pm. No one is to leave their home unless they work in the front line, food retail, NHS etc.
I heard this directly from my neighbour Trigger who is best friends with a guy called Boycey. Boycey knows a guy called Del who drinks down the pub with his uncle Albert. Albert was in the Navy during the war so knows his stuff. Tell your friends......


1969 4/4
1995 plus 8
2002 Aero S1
2013 M3W
2014 Plus 8
SFG #625082 23/03/20 07:28 AM
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diolch rydw i wedi archebu un, gobeithio y daw'n fuan


SFG
2012 4/4 Sport
SFG #625139 23/03/20 10:11 AM
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T
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Syniad da!


1969 4/4
1995 plus 8
2002 Aero S1
2013 M3W
2014 Plus 8
SFG #625192 23/03/20 01:55 PM
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i try to describe it as simple as possible but there were several steps, unfortunately.
It started with me building an open K&N. I connected the breather upstream in front of the MAF sensor, just like in the original.

I was very happy with the performance. But after a longer ride to Italy the dropouts started. I had a spare MAF sensor with me and exchanged it. Then the car drove well again for 300 km. But the problems started again on the way back and got worse and worse. In the end I could hardly hold the gas. The car only drove if I kept on moving the gas pedal.
I was back from my trip to Italy I hardly made it back home.
OBD2 could not really help. I saw the throttle close in the OBD. I changed the throttle but the symptom remained. So the throttle is ok but it is closed by the ECU, perhaps...or caused by a faulty plug connection...see below.

Then I swapped the throttle pedal for a similar used one. The car drove very well again. That was the time I posted it on TM.
But after a longer drive the error was back. I exchanged again the MAF sensor against a third one which I had on hand. The error remained. I drove this in the limp home mode without connected MAF sensor and without O2. sensor and without VCT. But even now the error remained and the throttle was disrupted.

I then have installed my original air filter box last year in end of May or June. Since then the car has been driving absolutely faultlessly for 6.000 km in 10 months.
Sorry I didn't report this on TM because I wanted to make sure that everything is permanently good. This is the case now.
(The only change from the original is that I left out the sponge on the breather intake and I mean the engine has more torque. I will clean the sponge very well and use it again in the future to test the difference again. But that is another story).

So I can not say exactly what the reason is re the drop outs.

Guess: 1) the MAF sensor became too hot due to the very close upstream mounted breather. But against this is the fact that the car also had the dropouts in limp home mode without MAF input.

2) The mixture was perhaps too lean with the open K&N and the ECU intervened.

3) I had changed the electric throttle but I had not paid attention to the throttle plug. When I later rebuilt everything back to the original (air filter box) I checked the plug of the throttle valve again and cleaned it. I even disconnected the red inner plug and preloaded all contacts a bit more. Since then the throttle response feels somehow more direct and spontaneous and I have no more dropouts. This contact is in an area where rain or washing water can reach into this plug.

Because I had changed so much I can not tell the exact reason. But my first guess is that it was this throttle plug.

To know for sure I would have to put everything back with the open K&N and also the original gas pedal to see that everything is still good. But that's a tinkering for some day. My car drives very well.

Conclusion, I would first check the connectors of the throttle and the MAF sensor (but the MAF connector is secondary because the error was also in limp home mode).

If you read with OBD2 it might show you a completely different error than I had...who knows.

BTW, Stuart, do you use the original filter box or an open system?


'14 4/4 graphite grey
SFG #625232 23/03/20 03:59 PM
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Did you by any chance oil the K&N filter? If you did it is possible that oil that has not drained before fitting may have got onto the sensor wire in the two MAFs that you have used, this will upset the MAF readings and cause the ECU to have spasms. Yes, if the air filter is near to heat then the free flow K&N will take more hot air into the sensor and that can disrupt the readings. When I changed my air filter I built a cold air flow from the exterior of the engine bay in order to alleviate that problem.


Bruce
1964 4/4 Series V Comp (Megan)
1994 +8 (Maurice)
2013 M3W (Olga)
SFG #625238 23/03/20 04:18 PM
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Thanks gents- to answer:
No this is with the standard air filter . A friend (of Craig's) connected a professional OBD reader and no faults showed up. He cleaned the airflow sensor. Then I put in some petrol additive and filled the tank with 3/4 of a tank of 97 octane. Then I blasted up and down the A34 at 5500 rpm to perhaps clean out any clag in the Catalyst. (Including hitting a huge pothole which bounced the car so hard that it triggered the fuel shu off valve - very dangerous and it's been there for a long time, apparently). The problem is still there.

So Heinz, I think I should check the connectors on the throttle valve - but, where is this, please?


SFG
2012 4/4 Sport
SFG #625263 23/03/20 05:37 PM
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Stuart, it is the connector from which you can see the colored cables on the far right of the edge of the picture.

[Linked Image]

First you have to remove an additional red lock (you can see it here in the pic,the red stripe, and also on the MAF connector - it's the same mechanism. The MAF plug is in front of the car screwed into the air filter box.) and then you can remove the connector. The plug has to be pressed together a little bit to overcome the retaining barbs.


'14 4/4 graphite grey
SFG #625264 23/03/20 05:54 PM
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Thanks Heinz, I'll give that a try


SFG
2012 4/4 Sport
SFG #625266 23/03/20 06:00 PM
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You could first try contact spray just to see any change. If so I would pull the inner plastic oval redish piece of plastic in the removable part of the plug very gently away and try to tension the contact lines a very bit, but be very careful when doing so...especially when you push this inner oval part back into the plug without bending something. Everything should be really dry after using contact spray.
This measurement I did because this contact spray used alone was only good for a week or so. It seems to be a sensitive plug.
Also I would check if the solder points of cable and plug seem tight and ok.


'14 4/4 graphite grey
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