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Discussion Starter · #1 ·
Hi All
At my wits end and hope someone can offer some advice.
I have owned the car for the last six months and right from the start the car has idled at 1100 revs once on the move,there is also a slight misfire/judder at low revs.On the move and the car behaves without any problems,freely revs to the red line and no hesitation.An independant specialist looked the car over and couldn't find a fault.It has just been returned from the main dealer for a second time and it would seem they have no idea.They say all sensors etc are okay,base idle has been reset no problems with coils leads etc and the head gasket is okay(assume they have done all the tests)and apparently the timing is okay.They now say the cylinder head needs stripping down if they are to try and find the problem.Having already thrown over £500 at the car should i just trade it in or is there hope.I have changed..fuel filter,spark plugs,coolant temp sensor,oil and filter,air intake control valve.Thanks Gary
 

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I had a problem with the idle on my GTI it was having problems starting, I had to use some revs and then the revs would drop very low and stall.

I tried looking at the IACV on top of the plenum but all seemed fine.

It was getting a bit awkward dropping down the gears while keeping the accelerator pressed.

All fine since I replaced the battery.
 

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Does the GTI have the vvc engine? If so I had exactly the same problem and rectifyed it by replacing the brown temerature sender on the front of the engine. This sender transmits to the ecu and if its not giving a proper signal the ecu reverts to a safety mode thus increasing the idle. After replacing this sender you may have to disconnect the battery for a while to reset the ecu. I see you have replaced a temp sender but was it the blue one that operates the temp gauge?
 

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A friend of mine had exactly the same problem on a TF160 engine fitted in his kit car. A diagnostics check gave it a clean bill of health, and changing the CTS and all the gaskets on the inlet side, plus cleaning the idle valve and throttle body made no difference whatsoever.

It turned out that it had the wrong kind of lambda sensor fitted by the guy that built the car, he used the one from the metro donor car. there are two types apparently, and although the sensor fitted was working fine, it made the idle mixture a tiny bit richer, increasing the speed to 1100 rpm.

A new lambda sensor sorted it out completly.
 

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Discussion Starter · #5 ·
Trickey did your friend find that if they started the car and just left it to idle that once it came off fast idle it would sit at the correct revs,only to find pulling away and pulling up at the first junction that the revs had then jumped up 1100 revs and would stay there until the car was switched off and restarted.The lamdba sensor sounds plausible,my understanding is that there are two ,is this correct.thanks
 
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