Rough Idle, Engine cutting out.....

[M87NER]

Hey peeps,
What can this be?.....start me car in the mornings or evenings ect....after its been sitting for a while it will idle 1000rpm and keep droping down to like 500rpm and back again for a bout 10 seconds-sometimes it will cut out, even after an hours drive it will idle say 900rpm but will keep dropping 100rpm and up again.......and sometimes if i pull up to a juction when slowing down it might cut out when i put he clutch in.....also noticed a bit of blackish smoke come out if i stop and then pull off....

any ideas? ....probs have been covered before but coudnt find anything....

Cheers.

 

[shantybeater]

maf maf maf...thats my bet

get vagcom on it !

 

[M87NER]

will it show up a fault if i plug vagcom in it or will i have log 002 to get some readings?

 

[shantybeater]

it may throw up a fault, it may not...you can always try unplugging the maf & going for a short drive, although this made no difference when mine went a few weeks ago....

im afraid plugging in VAG-Com & reading faults is as far as my knowledge goes..dont understand any of this logging business, sorry mate

 

[M87NER]

Cheers.............will be pee'd off if its a maf again-i've already had 3 since november!

 

[__B3NNY__]

best bet would be to log the maf. It might not throw a code but it could be reading real low.

Apart from the MAF it could be the coolent temp sensor sounds like the same symptoms that my valver had when hers packed up.

 

[pj1985]

I have this exact problem but when it gets warm the car is fine. Theres no codes and I had a new green coolant temp sensor last year and maf logs look ok so not sure what to do next.

 

[ibizacupra]

suspect airleak... whats fuel trims on idle doing?

 

[M87NER]

How do i check fuel trims?

' think a found it block 032 ' and if less than 5% possible leak after the turbo...

 

[Neel-Cupra]

suspect airleak... whats fuel trims on idle doing?

bill mine is throwing up a Secondary air injection bank 1 leak detected with the same problems, where would i look for the leak?

 

[scottc1088]

mine was doing this sometime when warming up, a new cts fixed it though

 

[M87NER]

logged 032, on idle it stayed on 0.0%

 

[nads]

Mines doing it at the moment. Idle sensor on the air intake. Getting it sorted tomorrow hopefully.

 

[M87NER]

Could this be related?

Sorry i dont know how to make the logs below into the more simple viewing...

Tuesday 6 May 2008 19:46:47
6K0 906 032 1.8L 20VT EU3 0002

Group A: '033
Lambda Voltage Bin. Bits Bin. Bits
TIME
Marker STAMP % V
0.27 -3.1 0.765
0.57 -3.9 0.755
0.87 -4.7 0.735
1.17 -4.7 0.695
1.47 -5.5 0.645
1.77 -4.7 0.38
2.07 -3.9 0.09
2.37 -3.1 0.08
2.67 -2.3 0.09
2.97 -1.6 0.09
3.37 -0.8 0.1
3.77 0 0.115
4.07 0.8 0.435
4.37 -1.6 0.715
4.67 -2.3 0.745
4.97 -3.1 0.75
5.27 -3.9 0.725
5.57 -4.7 0.695
5.87 -4.7 0.665
6.17 -5.5 0.535
6.47 -3.1 0.1
6.77 -3.1 0.075
7.07 -2.3 0.085
7.37 -1.6 0.13
7.67 -3.9 0.7
7.97 -3.9 0.74
8.37 -4.7 0.75
8.67 -5.5 0.74
8.97 -6.3 0.72
9.27 -7 0.71
9.57 -7.8 0.695
9.87 -8.6 0.685
10.17 -8.6 0.625
10.47 -7 0.225
10.77 -6.3 0.075
11.07 -6.3 0.08
11.37 -5.5 0.085
11.67 -4.7 0.1
11.97 -3.9 0.115
12.27 -5.5 0.49
12.57 -5.5 0.685
12.87 -6.3 0.715
13.27 -7 0.725
13.57 -7.8 0.7
13.87 -8.6 0.675
14.17 -9.4 0.67
14.47 -10.2 0.68
14.77 -10.2 0.65
15.07 -10.9 0.525

 

[DorsetStrider]

When was the last time you changed your air filter?

I was having this problem with mine... after lots of time spent playing with MAF's and head scratching I took the air filter box to bits... the filters were totally clogged with sh*te. Changed filters and problem went away.

 

[M87NER]

ive got an induction on-only bout 2 months old... checked vagcon and a fault came up 16514 iirc of the top of me head which is lamba circuit malfunction b1 or something, i've cleared it and gave it a thrash and no faults have come back up.....

 

[M87NER]

Right ive been getting confused now with whats been happening with me car...

Plugged it in to vagcom got a fault 'lamba sensor b1 malfunction in circuit'
cleared that and was fine untill a day later when it went into limp mode this time it bought up ''lamba no activity''. cleared it to see if it comes back after abit of driving so next day car was still idling rough so unplugged me maf and stopped idleing rough!.....so plugged it back in and so far all seems good since saturday- scanned it when i got home 'mass air flow g70 signal to low' would that be because i unplugged it or?......cleared it anyway and me car is running fine at the moment.

would this be that me maf is slowly dying? or lamba sensor ?

 

[Myki da Pyki]

Pre cat lambda mate

 

[Forbez]

What TIP have you got on the car? Forge ibiza or Samco Golf/ leon?

 

[M87NER]

What TIP have you got on the car? Forge ibiza or Samco Golf/ leon?

Forge ibiza TIP