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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 April 3rd, 2014, 12:27   #1
fatkid
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Join Date: Jan 2011
Location: Maine
Fuel Economy: 46/49/53.5
Default rough running, help!

2003 TdiEgr Delete, Stage 1 Malone, 150K. on the way to work this morning the engine started to sputter. it went from barely noticeable at first to violent by the time I made my 30 mile commute. like it was running on 3 cylinders. this afternoon I have filled the tank about 10 gallons of new fuel, change the fuel filter, air filter, and full oil change. no difference. then I checked the fuel pump by loosening the high pressure fuel lines while the engine was running fuel shot out of all four injectors. I then removed the injectors soaked the tips in diesel fuel and wipe them clean. still running the same if not worse!?
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Old April 4th, 2014, 11:56   #2
fatkid
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Today I loosened all the fuel lines at the injector in an attempt to locate a bad injector. removing fuel supply to each injector was equally detrimental to the idling. The car is making good boost as well.

all suggestions welcomed?
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Old April 4th, 2014, 13:21   #3
BobnOH
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Join Date: May 2004
Location: central Ohio
Fuel Economy: 50/45/35
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Has it got out of time? I would check to see if any codes have been stored. Re-plug that big connector at the IP
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Old April 4th, 2014, 13:54   #4
fatkid
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I Don't Have Vcds. I do have a code scanner I have no check engine codes. additionally, this afternoon I have 2 used spare injectors and played shuffle with them with no change. I Unplugged The IP AndPluggedBack In With No Change. while I Was There, I unplugged the maf sensor just see what would happen and there was no change? this time I have my wife in the car and I noticed the excess of smokey exhaust
Thank You For Suggestions

Last edited by fatkid; April 4th, 2014 at 13:57.
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Old April 4th, 2014, 13:59   #5
BobnOH
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Quote:
Originally Posted by fatkid View Post
Today I loosened all the fuel lines at the injector in an attempt to locate a bad injector. removing fuel supply to each injector was equally detrimental to the idling. The car is making good boost as well.

all suggestions welcomed?
That tells me it's probably not the injectors. I'm thinking broken vacuum hose or some other thing.
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Old April 4th, 2014, 14:38   #6
fatkid
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I did have a vacuum hose disconnected! the diagram on your hyperlink the hose was disconnected from the T connecting 4 To 1. additionally I have a code P 0304 misfire of cylinder 4. that is one of my old injectors I was using to test with. I'm going to replace that with original and see if I have better results.
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Old April 4th, 2014, 15:20   #7
fatkid
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Replaced Injector Code Cleared. checked the vacuum hoses all seemed fine.... Its Gotten Worse. Smoking Really Bad and violently shaking??
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Old April 4th, 2014, 16:25   #8
Tdijarhead
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How about that large hose on the passanger side down underneath that goes to your inter cooler mounted just in front of the front passanger tire well? Any chance that hose has come loose or developed some sort of leak?
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Old April 4th, 2014, 18:23   #9
fatkid
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from the turbo compressor to the intercooler? I don't think so because I'm making good boost according to my scan gauge, but I'll double check in the morning anyways.
Thank You.
I'm starting to lean towards the timing belt skipped?? Any Thoughts?
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Old April 5th, 2014, 07:07   #10
jettawreck
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Quote:
Originally Posted by fatkid View Post
....
I'm starting to lean towards the timing belt skipped?? Any Thoughts?
That was one of the first things suggested and would have been the first thing I would have checked given the possibility of doing lots of damage by continuing to run it. Always verify TB tension and condition if such situations.
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Old April 5th, 2014, 07:23   #11
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Yeah, check the mechanical timing and everything under that timing belt cover VERY carefully. And do not run the engine until you do.
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Old April 5th, 2014, 08:25   #12
fatkid
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as soon as it happened I pulled over and just did a quick visual inspection of the belt. belt is in good conditioN. this morning I checked the mechanical timing all satisfactory. Now I'm at a total loss?
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Old April 5th, 2014, 09:15   #13
Genesis
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How long since the intake has been cleaned?

There's a non-zero chance that you have a compression leak on one cylinder... which is why everyone said "check mechanical timing!" as one of the causes of that is a timing belt accident.
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Old April 5th, 2014, 09:22   #14
fatkid
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I'm not sure what non-zero chance means? intake was cleaned 30,000 miles ago when I did the timing belt and removed the EGR.
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Old April 5th, 2014, 09:27   #15
LNXGUY
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A clogged intake wouldn't lead to sudden rough and crazy running like this.. This is starting to sound more and more like the pump.
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