What did you do to your MKIV today?

J_dude

Veteran Member
Joined
Jan 9, 2020
Location
SK Canada
TDI
2003 1.9l “Jedi”
No I just thought 'can confirm' meant yes to IBW, and I have no idea what caravan wheels are. I mentioned I was confused and you never clarified after so I was still not sure. Not trying to be mean or anything, I was genuinely not sure. Sorry if it came a cross as rude.
As a fellow Canadian I approve this message. 😂
 

northern diesel

Veteran Member
Joined
Dec 5, 2023
Location
Northern BC
TDI
2006 mk4 TDI Jetta Wagon
I’m going to be trying to diagnose a possible limp mode - my daughter has been complaining about losing power on hills ever since I installed a 2.5” catless downpipe in her ALH golf.
I’m going to plug it in and run diagnostics - but with ALH stock everything , is opening up the downpipe generally not a good idea ?
Does she need a tune?
I’m asking for advice here. I will begin with test driving and checking all the connecting turbo lines , as well as the actuator.
But she said it started as soon as the install was done.
I guess I could always put the stock downpipe back in.
 

dieseldonato

Veteran Member
Joined
Mar 10, 2023
Location
Us
TDI
2001 jetta
I’m going to be trying to diagnose a possible limp mode - my daughter has been complaining about losing power on hills ever since I installed a 2.5” catless downpipe in her ALH golf.
I’m going to plug it in and run diagnostics - but with ALH stock everything , is opening up the downpipe generally not a good idea ?
Does she need a tune?
I’m asking for advice here. I will begin with test driving and checking all the connecting turbo lines , as well as the actuator.
But she said it started as soon as the install was done.
I guess I could always put the stock downpipe back in.
No, this will not cause any issues. When I bought my car it had a patch work of garbage exhaust on it, no cat, no muffler and a broken flex pipe. The car ran fine, zero power issues. I installed 2.5" exhaust, no cat, no muffler and still resulted in zero running issues. Something else is wrong with the car to trigger the limp mode.
 

PakProtector

Veteran Member
Joined
Jan 5, 2014
Location
AnnArbor, MI
TDI
Mk.4's and the Cummins
It's possible a plugged cat was masking turbo issues.

Start by checking DTCs and running the turbo control system test:
While that is a fine place to start, my first TDI had limp mode issues induced by overboost. The system had no issue moving the arm to either extreme, but under load/pressure it could not get the vanes open before boost went bonkers. The expensive experiement of a new turbo did indeed fix it right up. There was some more diagnostic work done to leave me slightly sure-er that it was indeed the turbo.

Douglas
 

P2B

Top Post Dawg
Joined
Jan 11, 2006
Location
Toronto & Muskoka, Canada
TDI
2002 Jetta, 2003 Jetta, 2003 Jetta Wagon
The system had no issue moving the arm to either extreme, but under load/pressure it could not get the vanes open before boost went bonkers.
Sticky vanes or weak actuator spring causes this. You can see it when running the test - lever should snap back to the no boost position when vacuum is released, even a slightly sluggish return can result in overboost.
 

northern diesel

Veteran Member
Joined
Dec 5, 2023
Location
Northern BC
TDI
2006 mk4 TDI Jetta Wagon
Sticky vanes or weak actuator spring causes this. You can see it when running the test - lever should snap back to the no boost position when vacuum is released, even a slightly sluggish return can result in overboost.
Ok thanks - yeah that’s what I found today - sluggish actuator rod movement - not actually limp mode though- the kid has no idea how brutal it is to drive a car in limp mode- but turbo is not consistent -
19561 - Valve for Intake Manifold Flap (N239)
P3105 - 35-10 - Open or Short to Ground - Intermittent
16485 - Mass Air Flow Sensor (G70)
P0101 - 35-10 - Implausible Signal - Intermittent
16785 - EGR System
P0401 - 35-10 - Insufficient Flow - Intermittent

These codes also suggested to me that it’s well time to remove the intake manifold, egr valve and allow some air in.
I might as well replace those vac lines while I’m in there too.

I installed my cheap Chinese “upgraded” IC today with a vented fender liner and 3 bar map.
It sorta fit- I had to make it fit.
 

BrettLu

Active member
Joined
Jul 22, 2016
Location
Martinez, CA
TDI
02 Golf
There's more to this story...Care to share?
It actually ran and drove fine, but lately it's been pressurizing the cooling system losing around a pint of coolant per day(about 80 miles). Finally decided to pull the head to do a headgasket before winter. I noticed a coolant/oil sludge on those 2 ARP studs when I unthreaded them, pulled the head and could see the cracks in the block. I started to clean it a little more and noticed the pistons 🤦‍♂️

I got the car January of 2015 with 242,000 when a coworker did a 5 speed swap and could't get the car to run, I resealed the pump and it's been good ever since. I immediately began to upgrade it.. DLC 1019's, VNT-17, stage 4 Malone, .658 5th gear and the last thing was a brand new AMC cylinder head 30,000 miles ago. The car currently has 419,000 miles.
 

Nuje

Top Post Dawg
Joined
Feb 11, 2005
Location
Island near Vancouver
TDI
2002 Golf 6MT; 2015 Sportwagen 6MT; 2016 A3 e-tron 6DSG
Sounds like you don't mind working on the car. And given you live in a non-snow/salt area, I'm assuming the body is in decent shape, in which case, I'd just look for a block; probably <$500 (?).

I have a BEW block here that's destined for recycling unless I can find someone in need...and I *think* you could build a franken-motor with BEW bottom end and ALH head (at least according to the following thread):
 

BrettLu

Active member
Joined
Jul 22, 2016
Location
Martinez, CA
TDI
02 Golf
Sounds like you don't mind working on the car. And given you live in a non-snow/salt area, I'm assuming the body is in decent shape, in which case, I'd just look for a block; probably <$500 (?).

I have a BEW block here that's destined for recycling unless I can find someone in need...and I *think* you could build a franken-motor with BEW bottom end and ALH head (at least according to the following thread):
Unfortunately the car was in Michigan for 10 years before I got it. It has rusty rockers and undercarriage.
 

csstevej

Top Post Dawg
Joined
Aug 12, 2004
Location
north nj
TDI
2001 golf tdi 4 door auto now a manual, mine, 2000 golf 2 door M/T son's,daughters 98 NB non-TDI 2.0, 2003 TDI NB for next daughter, head repaired and on road,glutton for punishment got another tdi 2001NB,another yellow tdi NB , added an 06 NB DSG
I was gonna ask that too…..how would they know ?
 

norbert77

Veteran Member
Joined
Feb 2, 2022
Location
Petrolia
TDI
01 beetle
And commie state of California would frown on the franken block - ask how I know :(:cautious:.
I was gonna ask that too…..how would they know ?
Around here it used to have admission testing and the car had to look original. Not allowed to swap older engines into a newer car so if it was a V6 original and now will be 8 and they would check Lock serial numbers. But I doubt many of them are specialist enough to pick up on similar engines.

Funny enough I was selling a few things last month and the guy came over, so my beetle and we had a lot of chats because he used to have a jet of agon and has another one currently. He was insisting that if I ever have intermittent engine running on three cylinders it's going to be a loose injector wire under the valve cover, I tried explaining mine is ALS all mechanical but the insisted. So it's hard enough to teleport even for people to have owned it, I think this is more of a problem for 1980 Chevy trucks with a duramax swap. I suppose you guys can all just plead the fifth and not even bring up the conversation.
 

jmodge

Top Post Dawg
Joined
Jun 18, 2015
Location
Greenville, MI
TDI
2001 alh Jetta, RC2 w/.205's 5speed daily summer commuter and 2000 alh Jetta 5spd swap, 2" lift, hitch, stage 3 TDtuning w/.216's winter cruiser, 1996 Tacoma ALh
Brought the Golf with no name into the barn. Resealing the leaking IP. Pulled the tires and inner fenders. I'm going to clean it up from the fuel leak and search for an oil leak. Then I'm going to dowse it with Fluidfilm to prep it for it's first taste of salt this winter.
 
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