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Old 29-11-17, 08:55 PM   #1
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Default THP Odd Limp Mode

I have an odd issue and wondered if anyone here has experienced similar or could advise me.

Car is 2007 Gti, 76k, regularly serviced. Timing kit, refurb turbo and a remap all done by the previous owner about 18 months ago. It idles a little rough, I've replaced plugs but it hasn't helped and I'm assuming the rough idle is a side effect of the remap.

Anyway the issue is that at random times the car goes into limp mode (at least I assume it is limp mode) - sluggish, top speed about 65, no boost. When this happens there is no engine management light on, no warning messages on the dash and according to my cheap OBD reader - no codes stored active or pending. I'm aware generic readers can be hit or miss so there could be a code not being picked up, but for now that's all I've got.

If I then reset the codes (even though there are not any recorded) my reader shows 'error' (presumably because they are no codes to erase) BUT the car does then return to normal, full boost etc.

It can go for months or just a few days between limping again - doesn't seem to be a common condition such as temperature/driving style etc.

My guess (and I'm a real novice) is that the ECU is running tests and from time to time a test fails on something like an intermittent O2 sensor, that then sends the car to limp. When I reset the codes I'm actually also resetting the test cycle, and so the car performs as normal until the next test cycle fails when the intermittent sensor fault is present at the time of the next test.

Could be miles off here, but would love to hear of your thoughts or any similar experiences

Last edited by fishnwhips; 29-11-17 at 09:31 PM.
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Old 30-11-17, 10:47 AM   #2
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Remap should not give a poor idle. Carbon build-up on inlet valves is one of the most common poor idle issues followed by high pressure fuel pump

Both of which can trip random fault codes

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Old 30-11-17, 10:57 AM   #3
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I'd say you've got the carbon build up issue.
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Old 30-11-17, 12:07 PM   #4
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Any evidence of the dreaded water ingress anywhere?
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Old 30-11-17, 09:01 PM   #5
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Thanks guys.

I'm not too concerned about the rough idle, more the mystery tripping into limp mode. For the carbon build up is it worth trying something like seafoam - or is that just snake oil?

I've also heard there is no fuel filter (or it is sealed in the fuel pump) - is that right because you can buy them?
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Old 30-11-17, 10:43 PM   #6
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I have a thp RCZ, and am pretty sure there is no serviceable fuel filter.

With regards carbon, I think you'll struggle with anything other than walnut blasting.
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Old 01-12-17, 12:47 PM   #7
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Quote:
Originally Posted by fishnwhips View Post
Thanks guys.

I'm not too concerned about the rough idle, more the mystery tripping into limp mode. For the carbon build up is it worth trying something like seafoam - or is that just snake oil?

I've also heard there is no fuel filter (or it is sealed in the fuel pump) - is that right because you can buy them?
Sea foam..... may as well pour fizzy juice down there for all the good sea foam does!

Walnut blast is best cleaning method in terms of time and value



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