Golf 5 MAP sensor - issues

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Mischief Maker
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Golf 5 MAP sensor - issues

Post by Mischief Maker »

Hi guys- yet another problematic map sensor - just had my map sensor replaced less than 9 months ago with about 5000kms since then and guess what ?! - car Jerks and no boost once the car heats up - halfway on the temperature gauge - cool the car down overnight - started up early in the morning and car runs fine until half way again on the temp gauge and the no boost - then ran vag com - engine faults given manifold pressure boost - first intermitten then signal implausible and then signal exceeded and then signal to lower - vice versa - cleared all codes (while car was hot) error came back as manifold pressure boost- so immediately swapped old map sensor - hooked up vag com - cleared all codes - ran full diagnostic again and no errors found- started the car - drove until car heated up to halfway on the temperature gauge again and car lost boost again!!!

Ran vag com while the car was hot again - error manifold pressure boost - same errors as above

This time what I did I put the previous sensor which was out of the car - left it in the fridge for 5 minutes and then replugged whIle the car was hot and ran vag com and cleared all old errors - ran a full diagnostic on the car and whaaalaa - all errors cleared .
My question is would a map sensor be faulty when it heats up or could it be my wiring but NOTE what I have explained above is a process of elimination to prove that the harness wasn't the cause.


Any advice on way forward ????
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panic-mechanic
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Re: Golf 5 MAP sensor - issues

Post by panic-mechanic »

Did you buy OE or aftermarket.
Stephan van Tonder - Jhb - Putfontein Benoni
'05 Audi A6 3.0L TDI Avant
'09 Touareg 3l TDI
'13 VW CC 2l tdi (repair project)
'05 Touareg v10

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Mischief Maker
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Re: Golf 5 MAP sensor - issues

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Original ' OE
Mischief Maker
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Re: Golf 5 MAP sensor - issues

Post by Mischief Maker »

Should I post a pic of both devices?
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panic-mechanic
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Re: Golf 5 MAP sensor - issues

Post by panic-mechanic »

Then perhaps you have a contamination issue?. lots of oil in intake pipes?.
Stephan van Tonder - Jhb - Putfontein Benoni
'05 Audi A6 3.0L TDI Avant
'09 Touareg 3l TDI
'13 VW CC 2l tdi (repair project)
'05 Touareg v10

Perfect Power dealer. I do dyno tuning.
Mischief Maker
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Re: Golf 5 MAP sensor - issues

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What's the best way to check that ?
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panic-mechanic
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Re: Golf 5 MAP sensor - issues

Post by panic-mechanic »

Pull the boost pipe where it sits the lowest and see how much oil comes out.
Stephan van Tonder - Jhb - Putfontein Benoni
'05 Audi A6 3.0L TDI Avant
'09 Touareg 3l TDI
'13 VW CC 2l tdi (repair project)
'05 Touareg v10

Perfect Power dealer. I do dyno tuning.
Mischief Maker
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Re: Golf 5 MAP sensor - issues

Post by Mischief Maker »

Okay I'm back - have removed and cleaned all pipes- there was oil in the pipes which I removed - reset everything - and still the same issue - could the turbo be going?

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Re: Golf 5 MAP sensor - issues

Post by panic-mechanic »

how much oil. If lots then yes you can have a turbo issue.
Stephan van Tonder - Jhb - Putfontein Benoni
'05 Audi A6 3.0L TDI Avant
'09 Touareg 3l TDI
'13 VW CC 2l tdi (repair project)
'05 Touareg v10

Perfect Power dealer. I do dyno tuning.
Mischief Maker
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Re: Golf 5 MAP sensor - issues

Post by Mischief Maker »

If I gathered all the oil which was there i'd say it would be about two table spoons of oil which I removed from the plastic pipe running to the throttle body and the bottom rubber pipe joining the intercooler.

I've read somewhere that a oil catch can be fitted at the bottom end of the manifold pipe. Any idea if this is a solution?

One more question, will my pcv valve (if stuffed) cause oil in my intercooler?
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panic-mechanic
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Re: Golf 5 MAP sensor - issues

Post by panic-mechanic »

no two tablespoons are not a reason to worry and not causing the issue.
Stephan van Tonder - Jhb - Putfontein Benoni
'05 Audi A6 3.0L TDI Avant
'09 Touareg 3l TDI
'13 VW CC 2l tdi (repair project)
'05 Touareg v10

Perfect Power dealer. I do dyno tuning.
Mischief Maker
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Re: Golf 5 MAP sensor - issues

Post by Mischief Maker »

Ok - will go to goldwagen tomorrow with the OE map sensor- hopefully they have the right one and take it from there - believe it goes for R495 +/-

Most of you would believe that buying the OE part from VW would be the better option but note I did 9 months ago and that's now not functional.

I guess when it comes to electrical no one guarantees you anything...

Just wondering- has anyone ever fitted a catch can to a MK5 gti ?

Il keep you all posted after fitting the new map sensor...Crossing fingers GW has the right one and it actually solves the problem
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