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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 March 19th, 2017, 20:38   #1
skyking1
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Default Dead pedal on the beetle.

It has 190k miles on the original pump. Recent filter change.
It's been at Malone stage 4 + with 764s and a 17/22 and the little bits for 20k. Great fun
I could get a hard vapor lock on it if I stood on it before it was completely warmed up.
Now it has a dead pedal when cold, that improves when it warms up. If I go light on it when warm, I can get 1 decent pull out of it.
Any thoughts? I'm leaning towards the injection pump.
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Old March 20th, 2017, 06:27   #2
skyking1
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If it is the pump and I do the PD lift pump, I'd probably push a leak?
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Old March 20th, 2017, 08:35   #3
AnotherPerson
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Being that all of the stock hoses aren't pressurized you may find some leaks with a lift pump. If some of the regular seals in the pump start to leak you can replace them pretty easy. Besides the main seal.


As far as your original question I've been watching this one to see what people say. No idea on that one.


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Old March 20th, 2017, 08:46   #4
skyking1
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yes, hoping some folks check in. It's pretty dead, does not feel like a stuck VGT actuator at all. The whole " take it easy and get a good pull out of it" seems like fuel starvation. Maybe when I'm off it, the pump gets the air cleaned out and it can make that one pull.
I've never had a pump off or apart. Do I have to take the belt off to re-seal? It would seem so.
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Old March 20th, 2017, 17:30   #5
wonneber
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Quote:
Originally Posted by AnotherPerson View Post
Being that all of the stock hoses aren't pressurized you may find some leaks with a lift pump. If some of the regular seals in the pump start to leak you can replace them pretty easy. Besides the main seal.
What seal is the 'main seal' ??

I may have minor air leaks getting sucked into my pump.
Is there a common one that could leak air in?
250K on the car.
Going to order injectors and the pump gasket set in the very near future.
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Old March 20th, 2017, 19:27   #6
Dieselmonkey02
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Bad MAF maybe? They run like crap with a lazy MAF. Any air in the clear fuel line? Recent filter change, maybe bad oring seal on the tee. Or wrong clamps on the hoses on the filter.
Regular screw type clamps tend to not seal small hoses too well.
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Old March 20th, 2017, 19:33   #7
Dieselmonkey02
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Maybe the fuel pick up stuff in the tank is clogged up?
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Old March 20th, 2017, 22:38   #8
skyking1
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Thanks Monkey. The filter change was about 3K ago, so not likely an install problem. The pickup though, that is a possibility I had not really considered. I could unhook the line and blow back through it, then re-prime the line.
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Old March 21st, 2017, 08:41   #9
AnotherPerson
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Quote:
Originally Posted by wonneber View Post
What seal is the 'main seal' ??



I may have minor air leaks getting sucked into my pump.

Is there a common one that could leak air in?

250K on the car.

Going to order injectors and the pump gasket set in the very near future.


All the top seals can be replaced easily and are common. When I say main seal I'm referring to the shaft seal which is more involved if I remember reading correctly. I would say doing the seal kit from dieselgeek and if you haven't a new thermo T and the lines from the filter. See how that works out. Even if t doesn't solve it all if it's makes it better it can give you some more time without a pump rebuild.


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Old March 21st, 2017, 18:50   #10
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If you log with VCDS you can see if you're getting all the fuel that you should be getting (assuming you know what that number ought to be). If your pump can deliver it then I wouldn't think that there's an issue with the fuel delivery, that it has to do with the sudden boost (air issue?), so perhaps, as noted above, it really could be the MAF. Easy enough to log the MAF to see.
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Old March 21st, 2017, 19:12   #11
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I'll borrow the cable and log the fuel and MAF.
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Old March 23rd, 2017, 20:59   #12
skyking1
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Quote:
Originally Posted by Dieselmonkey02 View Post
Bad MAF maybe? They run like crap with a lazy MAF. Any air in the clear fuel line? Recent filter change, maybe bad oring seal on the tee. Or wrong clamps on the hoses on the filter.
Regular screw type clamps tend to not seal small hoses too well.
Mine did not have a clear fuel line, so I spliced a temp one it right off the pump. No air showing at idle. Tomorrow I will start logging the MAF and whatever else I can figure out.
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Old March 24th, 2017, 16:44   #13
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Quote:
Originally Posted by skyking1 View Post
Mine did not have a clear fuel line, so I spliced a temp one it right off the pump. No air showing at idle. Tomorrow I will start logging the MAF and whatever else I can figure out.
If you go to Malone's site there's a good document on VCDS logging. All that's mentioned is good to go through as it pretty much will give one a good idea of the health of the engine and such.
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Old March 24th, 2017, 18:02   #14
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So I ran some logs of the MAF requested and MAF actual, and the actual lags way behind when the pedal is flat. My issue is, why? It seems that my VNT actuator could cause this too. I can get an occasional good pull, and then everything tracks along. Do MAF sensors fail in that manner?
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Old March 24th, 2017, 19:42   #15
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You've got two ALHs, right? Just try swapping MAFs? I do this from time to time as it's quicker than pulling out my laptop and plugging in VCDS.

MAFs are VERY important in the entire scheme of things. I've only replaced two so far (in 2 1/2 years). First one was in the daughter's wagon. I ran logs and saw that the MAF was just weak, not bad, but wasn't quite at the top: for many folks they probably would have run and not really noticed much. I was doing a bunch of work on the car which is why I was scrutinizing it closely: I wanted it running very well when it left/leave me. The other was a complete and nearly sudden failure. Car stumbled after starting up and never really seemed to recover. Wife took off down the driveway (it's pretty long) and wasn't comfortable heading off to work. Handed her the keys to my car. I took hers out on to the street and it was bucking and puking almost like the DMF was failing. Stopped the car, opened the hood and pulled the connector the MAF- instantly smoothed out. Dumped in a spare MAF (the weak one from the wagon) and ran it until a new MAF showed up on the doorstep.

Interestingly side note on the bad MAF on the wife's car is that her Ultragauge had recently started reading really low MPGs, but the car was running normally (or so all seemed- that is, anything that was wonky wasn't really very noticeable).

The point of my ramblings is that bad MAF behaviors tend to vary quite a bit. Bogus readings/signals will cause the ECU to react quite wildly, and the engine will be forced to try and operate amongst all this confusion!
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