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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 January 10th, 2018, 09:31   #16
Matt-98AHU
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I think a compression check is in order.

Also, run a basic setting 04, post the results here. That at least can show us if the pump has adequate case pressure by proving it can adequately control timing advance.

Is this engine still all original? Original pistons?
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Old January 10th, 2018, 09:34   #17
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What stinks about the 1Zs is the pistons. I mean, yes, they can go hundreds of thousands of miles with seemingly few issues, but most of them eventually seem to develop piston slap in #3 first, and score up the cylinder walls a bit, even on well-taken care of engines.

AHUs and ALHs don't seem to do that with the updated pistons they come with... But there definitely is a pattern failure of the #3 cylinder on 1Zs as they get up there in mileage.
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Old January 11th, 2018, 13:11   #18
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check the IP harness, I remember having to repair that due to age at one point and I believe it gave me goofy IQ readings and idle
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Old January 11th, 2018, 21:44   #19
Abacus
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I repaired this once already since it was a swapped pump. I thought of that and it checked out ok.

The turbo is blown, so once I get back from vacation I'll toss the 442,000 mile original one back on and send this hybrid back to Bora for diagnosis as to why it failed at under 12k miles. Needless to say, I am anything but pleased but we'll see what becomes of it. I don't beat on my cars, never abuse them, and you can bet it was installed properly and primed before initial use. Aaron and BoraParts are good people though, so we'll see what happens.
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Old January 12th, 2018, 09:31   #20
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My '98 developed a lopey idle, timing jumped all over the graph, idle IQ jumped randomly from maybe 2 to 9, surged like crazy at parking lot speeds and even a little at highway speed on a very slight downhill. The injector balance was off but I don't recall it being as bad as yours.

Drove it like that a long time while trying to figger it out since it drove ok so I don't recall the mileage or if the symptoms came on gradually or all at once.

Anyhoo, the fix was a another pump. The replacement had broken insulation on the timing solenoid so I swapped that with the original pump. This would seem to exonerate that part as the cause of the original problems.

Haven't gotten around to opening the old pump up to see if there's anything obvious wrong with it. During the troubleshooting I checked all the usual suspects that folks suggest including a set of new nozzles balanced by DBW.

Got a spare pump to try?
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Old January 15th, 2018, 16:12   #21
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I’m confused.... was the rough running and odd injector balance caused by a damaged nylon fuel line?

-Todd
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Old January 23rd, 2018, 08:49   #22
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Abacus, I am going to assume you've already performed a ventectomy? After fresh timing, injectors, vacuum lines, dynamic and static timing good to go and some wire repairs at the IP harness, I was still battling a lumpy idle. I was also having trouble fueling the car. So I gutted the vent button and used some hose to physically push the vent flap open. Lumpy idle has disappeared and now I can fuel my car! I thought it was crazy how simple the fix was, but also crazy that it turned out to be the last thing you'd think would ever make your car run like poop.
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Old January 23rd, 2018, 13:54   #23
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Quote:
Originally Posted by ToddA1 View Post
I’m confused.... was the rough running and odd injector balance caused by a damaged nylon fuel line?

-Todd
No, the issues are on 2 different cars. Both are currently down.

I did a ventectomy about a decade ago, but thanks.
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Old January 23rd, 2018, 16:22   #24
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I assumed you had done it already. You seemed to have looked into most logical answers so I figured I'd give you something stupid to try lol. Kind of like the "did you try unplugging it and plugging it back in?" thing
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Old January 23rd, 2018, 18:50   #25
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It never hurts to help, and sometimes the simple things are often overlooked. Thanks.
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Old January 24th, 2018, 20:45   #26
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Have you got it figured out yet? Curious as to what caused it
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Old January 25th, 2018, 03:48   #27
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I've been on vacation in Mexico and am currently sick with the flu. Im swapping turbos this weekend and will report back.
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'96 B4V: 356,000 miles Malone 2+, PP520's, 6 speed, 02J short shifter, E-Codes, G60 brakes, Evo plate, DMF, stainless exhaust, heated leathers, cold weather package
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Old January 25th, 2018, 19:45   #28
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Quote:
Originally Posted by Abacus View Post
I've been on vacation in Mexico and am currently sick with the flu. Im swapping turbos this weekend and will report back.
Take care of yourself with this flu that's running around. It's pretty bad and hard to get by.
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Old January 26th, 2018, 23:01   #29
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Quote:
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I've been on vacation in Mexico and am currently sick with the flu. Im swapping turbos this weekend and will report back.
That's not good, as aja8888 mentioned it's a bad one going around from what I understand.

Since I don't react well to vaccines I don't get them, but if I'm somewhere and I start to hear a lot of coughing I do an about face and head for the door.

Also I hear the vaccine for the current version of the 'plague' is not very effective anyway, something like 32%.

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Old January 27th, 2018, 03:42   #30
Abacus
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My wife is a doctor and she said the vaccine is only 6-10% effective this year. Apparently the WHO chooses the combination of strains that makes up the flu shot and they changed their decision making paradigm yo try and increase the effectiveness. They chose poorly.

I don't get one either but she mentioned early in the season that I should due to battling a respiratory illness last year. She recently said I shouldn't bother getting one.

But I'm trying the same thing: avoidance. Not sure it's working too well.
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'96 B4V: 356,000 miles Malone 2+, PP520's, 6 speed, 02J short shifter, E-Codes, G60 brakes, Evo plate, DMF, stainless exhaust, heated leathers, cold weather package
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