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Go Back   TDIClub Forums > TDI Model Specific Discussions Areas > VW MKIV-A4 TDIs (VE and PD)

VW MKIV-A4 TDIs (VE and PD) This is a general discussion about A4/MkIV Jetta (99.5-~2005), Golf(99.5-2006), and New Beetle(98-2006). Both VE and PD engines are covered here.

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Old September 11th, 2019, 20:59   #16
STDOUBT
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Do what oilhammer suggested in post #8.
That will reveal a whole lot
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Old September 11th, 2019, 23:48   #17
Nero Morg
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Injector 1 is being told to underfuel to maintain smooth idle. I'd have that one tested.
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Old September 12th, 2019, 07:01   #18
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plugged fuel filter?

you get too much vacuum on the inlet of the pump and it'll lose all timing advance. IIRC stock base pump timing is like 3 degrees after TDC so def. white smoke and no power city

if the filter doesn't get it, try a separate fuel can plumbed into the filter's lines to the tank
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Old September 12th, 2019, 08:01   #19
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Quote:
Originally Posted by Nero Morg View Post
Injector 1 is being told to underfuel to maintain smooth idle. I'd have that one tested.
^^^This. Are we still the only 2 who think this is an injector issue??
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Old September 12th, 2019, 08:15   #20
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If this is true, # 4 is being told to over compensate. Switch them to see what happens
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Old September 12th, 2019, 08:16   #21
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If the numbers flip, injector. If not, something else
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Old September 12th, 2019, 18:34   #22
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Update:
I flipped injectors 1 and 4, warmed up the car, and got the following number:
IQ - 3.6 to 4.8
Deviation
1: -0.09
2: 0.33
3: -0.19
4: -0.05

I ordered a diesel compression tester and it should be in on Monday.
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Old September 12th, 2019, 19:11   #23
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Just so we're all clear, the above numbers and the numbers you posted on page 1 are considered well within spec.
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Old September 12th, 2019, 20:12   #24
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I agree, but the closer they are together the better. Also, IQ shouldn't fluctuate more than 0.4 on a healthy system.
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Old September 13th, 2019, 08:01   #25
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Your injectors are fine, IP is a question mark. Fluctuating IQ, is there anything that can cause that other than worn IP internals (asking cause I don't know)?
Double check air supply, fuel=diesel+air. Check pipes for loose fit.
Focus on Oilhammer's comments. You're on the right track, compression check will rule out more stuff.
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Old September 13th, 2019, 09:22   #26
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I don't think its the IP - I swapped in one from a parts car that was working fine and I'm getting an identical problem.
My mityvac pulls fuel just fine from both sides of the filter and right out of the pickup under the back seat. I swapped/tested a good EGR, CCV puck, and have a new MAF and no change. I'll double/triple check all the air connections of leaks and loose fit when I get back into in on Monday.
I'll test compression Monday and report back. Thanks again everyone!
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Old September 13th, 2019, 09:23   #27
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Could there be anything with the turbo where it collects oil when it sits and then burns it off when it spools up? Not sure how this would explain my start up issues, but maybe there are 2 problems?
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Old September 13th, 2019, 10:11   #28
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I very much doubt it is the turbocharger.

Check the compression, report back.
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Old September 13th, 2019, 21:39   #29
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Following! I have a very similar issue. I have one cylinder down to 410psi. Some seem to think the lower compression is the smoking cause, others not so much. I'm not sure. Have not had time to tinker with car much lately... Good Luck ClemXP!
Edit: My thread you probably already read link

Last edited by xjfish; September 13th, 2019 at 21:42.
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