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I know you can adjust idle speed but injector cycle is down to mapping.
 

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I've never done it before mate but found this.....
This is what I have in my records, it was not written by me:
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IQ adjustment

1) Open the Vag-com software.
2) Click on ENGINE.
3) Click on LOG IN
4) Enter 12233 in the login field then click DO IT.
5) Click on ADAPTATION.
6) It should already be in channel 1, which is what you need for IQ adjustments.
7) Note the reported IQ number (usually between 2-4mg/r)
8) Adjust the value from 32768 to something like 32750 and see what the IQ changes to.
9) keep adjusting the value till you get about 1mg/r more than what you started with.
So if your stock setting is 3mg/r, increase it to 4mg/r.
10) save the new value & take for a test drive.

Note: All cars are different. They all come from the factory with different mg/r readings
even if the adaptation value is the same (32768). Go up by 1mg/r, save, then test drive.
Repeat as necessary increasing the IQ reading by 1mg/r till you are comfortable with the
smoke level & the shudder is gone. For most cars, this is around 5mg/r, but as I said,
all cars are different and a little trial & error will be required to fine tune it.
 

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Do a google search for the "hammer mod". It changes the injector quantity manually. Again I've heard of it but never done it. I wouldn't say that changing would change the iq, but just the timing. If you remove the temp sensor it may run richer
 

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if injector no1 isn't performing well enough, and it's not the injector, I would suspect the loom, fuel rail or the pump. But prob the loom. I can't make out why you want to change the iq
 
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