All Things Mk5 > How to Guides / Troubleshooting

Mk5 too Rich

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rich83:

--- Quote from: Pudding on May 31, 2022, 08:57:53 am ---
--- Quote from: Vag-mk5 on May 31, 2022, 01:23:25 am ---And I recently changed the lambda probe

--- End quote ---

Genuine or aftermarket?

I've had issues with cheap aftermarket lambda sensors not reading correctly.  The only problem is, genuine ones are around £200 now!

--- End quote ---

Bosch one is £118 on eurocrapparts

pudding:

--- Quote from: Vag-mk5 on May 31, 2022, 09:39:04 am ---Yup its from Bosch the old one are bosch

Oriignal cost me 280€

--- End quote ---

If you have an OBD2 scan tool, check the long term fuel trims.  Also check the lambda requested and actual to see if lambda control is actually working.

What is the MAF reading at hot idle?  Should be around 2.5g/s.  Does the MAF number increase when you rev the engine?

Vag-mk5:
Hi, I have a quick question, can the mixture be changed in my case (rich) due to a leaking Soundpipe(soundgenerator) Or just reduced performance?

Thanks

pudding:
Possibly.  We didn't get the Sound pipe (thank god!) in the UK so I don't know much about it.

It's normally running too lean these engines suffer from, because of the large number of pipes and connections that can leak.

Running too rich isn't common but you have replaced the common causes of that.  Is the car getting up to temperature? A bad thermostat can cause the engine to run too cool, which can cause over fuelling.

Vag-mk5:
Hi, so I found the cause yesterday, the seal from the Soundpipe was not installed I've now dismantled it and stuffed it in there specifically for the hose.

Had an error code mixture too lean immediately after closing it.

I then did a test drive and couldn't find any misfires and the car just jerked more than before.

 But I have to say that I deleted the balance shaft a few years ago.

 Can the error code only come because of the rich run because it ran rich before and now suddenly gets more air.

The GTI has power :thinking:

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