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VW MKIII-A3/B4 TDIs This is a discussion about MKIII-A3/MkIII Jetta/Golf (<99.5) and B4 Passats (96,97) TDI's. Non TDI related postings will be moved or removed.

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Old March 1st, 2018, 18:56   #1
TDITim83
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Default Changing Injection Quantity issue

I have been on VAG Com and I can't seem to be able to drop my Injection Quantity low enough. Instead of being around, 3.2 I am above 6. And am only able to adjust it down to 5.8 at best. What am I missing?
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Old March 1st, 2018, 19:06   #2
jdulle
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I think what you need to do is loosen the bolts on the top of the injection pump and tap in the direction that lowers injection quantity. You should search for the procedure and follow those instructions, the top of the injection pump needs to move only a fraction of an inch. You should have the vag com connected so you can watch what is happening to IQ in real time.
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Old March 1st, 2018, 19:37   #3
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http://forums.tdiclub.com/showthread.php?t=258297

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Old March 2nd, 2018, 03:09   #4
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Here is a video of the hammer mod. As you watch it keep in mind that you do not need to hit the pump very hard. Maybe it just the video and a light hammer but it seems like these guys are really beating on that pump.

You will need the triangle bit to get the one bolt loose. Or hammer a 12 point socket down over it. The other three are torx.

They are raising the IQ and you need to lower yours so you’ll be going in the opposite direction. If you have one I would use a rubber or plastic headed hammer.

https://m.youtube.com/watch?v=TL_7KN4Nbvo
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Old March 2nd, 2018, 07:42   #5
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After a minimum of 15 years the QA on a VE pump that has never been apart may not want to move.

Even heavy tapping may not overcome the adhered seal and when it does let go there's no telling how far it might move. Then the hardened gasket may not seal again.

I'd be prepared with a new gasket set before attempting the hammer mod.
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Old March 4th, 2018, 16:17   #6
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It'll move, doesn't take much to make a big impact.

On my old 98 the "sweet spot" with RC3 tuning was to adapt to the lowest IQ and then hammer to 1.5
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Old March 4th, 2018, 17:28   #7
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those seals are $4.00~ and easy as heck to replace. i would replace them if you so much as move it, well at least order the seals, if it leaks, then you can fix it easy, otherwise you have a $4.00 set of seals for when they eventually do leak
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Old March 13th, 2018, 19:08   #8
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Quote:
Originally Posted by greenskeeper View Post
It'll move, doesn't take much to make a big impact.

On my old 98 the "sweet spot" with RC3 tuning was to adapt to the lowest IQ and then hammer to 1.5
Just out of curiosity greenskeeper, what was the reasoning for dropping the adaptation all the way before hammer modding? I understand that each car might want a slightly different IQ to run best, but from what I understand the general thinking around here is that you should keep adaptation stock before hammer modding for best ECM control over IQ. No criticism just genuinely interested as its the first time I've hear someone doing it in that order.
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Old March 14th, 2018, 14:12   #9
TDITim83
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Default Hammer Mod accomplished....not much change

I have completed the Hammer mod.....I'm now at 3.2 IQ. I do seem to have a little more power, though still low powered for sure. Im gonna switch injectors from my 98 TDI Jetta.....see what happens
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Old March 17th, 2018, 10:07   #10
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Quote:
Originally Posted by Giberish33 View Post
Just out of curiosity greenskeeper, what was the reasoning for dropping the adaptation all the way before hammer modding? I understand that each car might want a slightly different IQ to run best, but from what I understand the general thinking around here is that you should keep adaptation stock before hammer modding for best ECM control over IQ. No criticism just genuinely interested as its the first time I've hear someone doing it in that order.
exactly what you said...each car is different. I also ran full timing advance (5 degrees) and no EGR.

Adapting the IQ first then hammering to 1.0 gave me the best fuel economy/power balance (provided I kept my foot out of it, as it did smoke pretty good when WOT with that setting)
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