T25 Alternative Engine Forum

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Most liked posts	Author	Posted	Liked	Forum
Problème huile suite transformation moteur en golf gti 3	Fort	13 Aug 2026, 07:50	Once this week	T25 Alternative Engine Forum
Problème huile suite transformation moteur en golf gti 3	colinthefox	12 Aug 2026, 19:59	Once this week	T25 Alternative Engine Forum

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Last post

Petrol Alternative Engines...

Last post by silverbullet « 06 Apr 2024, 16:09
Replies: 10
by HarryMann » 15 Oct 2005, 01:57

Subaru Engine Types and Options

The normally aspirated (NA) flat 4's weigh about the same as a WBX and after installation there's always a cleaner...

10 Replies

137540 Views

Last post by silverbullet
06 Apr 2024, 16:09
Diesel Alternative Engines..... Read before asking questions

Last post by sdelasal « 09 Aug 2008, 22:43
Replies: 18
by admin » 13 Oct 2005, 09:35
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VW are renowned for their diesels and those fitted as standard to the T25 do not do it justice. What can you replace them with to getting better...
18 Replies

215663 Views

Last post by sdelasal
09 Aug 2008, 22:43
Automatic transmission stuck in 1st gear

Last post by The Tuffields « 16 Aug 2026, 17:08
Replies: 2
by The Tuffields » 22 Jul 2026, 17:46

I have a Vw 1988 campervan with 2.1l engine and automatic transmission. Van is stuck in 1st gear and cooked the transmission oil. Cleaned the...

2 Replies

301 Views

Last post by The Tuffields
16 Aug 2026, 17:08
Problème huile suite transformation moteur en golf gti 3

Last post by Aidan « 15 Aug 2026, 11:23
Replies: 26
by Fort » 10 Aug 2026, 12:19
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Bonjour. Je me présente, je suis français et je suis en possession d'un vw t3 origine 2.1 avec un moteur de golf gti 3 code 2e. J'espère que mon...
26 Replies

459 Views

Last post by Aidan
15 Aug 2026, 11:23
Diesel runaway

Last post by muttleypup « 14 Aug 2026, 19:03
Replies: 2
by Escamotage » 11 Aug 2026, 04:15

Hi all, few days ago I had experienced my first diesel runaway with my T3. As scary as it was I'm mostly interested in knowing if I did something...

2 Replies

106 Views

Last post by muttleypup
14 Aug 2026, 19:03
The T3200E thread

Last post by silverbullet « 08 Aug 2026, 15:11
Replies: 461
by silverbullet » 12 Aug 2018, 16:03
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Aka an Oettinger wbx-6 3.2 that found me by chance and collected on the way to T3Busmeet. I wasnt even looking for one! So many details that you've...
461 Replies

1147467 Views

Last post by silverbullet
08 Aug 2026, 15:11
1.6d to 1y the definitive guide

Last post by chockster « 07 Aug 2026, 20:55
Replies: 104
by weldore » 15 Aug 2012, 16:05
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theres been a few people over the years gone this route including myself and have had to ask questions or trawl through the alt forum for answers and...
104 Replies

763881 Views

Last post by chockster
07 Aug 2026, 20:55
What Engine is this?

Last post by clift_d « 06 Aug 2026, 12:21
Replies: 7
by chockster » 05 Aug 2026, 16:15

blob:
Hi All. Im new to VW bus ownership. But a veteran of other classics.
I have just bought a 1982 T25 D its in pretty solid shape considering...

7 Replies

279 Views

Last post by clift_d
06 Aug 2026, 12:21
Tdi and auto gearbox.. anyone done it?

Last post by silverbullet « 06 Aug 2026, 06:44
Replies: 3
by The Ark » 05 Aug 2026, 20:56

I have a Sinka with an AHU tdi lump in it, that drives very nicely, but I’m getting lazy in my old age, and fancy not having to change gear any more...

3 Replies

145 Views

Last post by silverbullet
06 Aug 2026, 06:44
Help! Timing belt creeping off cog

Last post by DigiMatrix « 01 Aug 2026, 18:04
Replies: 11
by sopranolady » 26 May 2016, 09:36

Hi, apologies if this is the wrong category for the post, I'm looking for urgent advice, having hit a snag with our engine fitting project.

Our 1990...

11 Replies

45812 Views

Last post by DigiMatrix
01 Aug 2026, 18:04
Re-mapping AHU TDI

Last post by hotpod « 22 Jul 2026, 21:50
Replies: 16
by hotpod » 02 Sep 2025, 13:25
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Is this possible?
When I put the engine in 12 years ago, I thought I could get it re mapped ( because it has an ECU) to suit pushing a Syncro Westy...
16 Replies

53897 Views

Last post by hotpod
22 Jul 2026, 21:50
2.0 MkIII golf GTI engine swap - wiring

Last post by Resynth « 01 Jul 2026, 13:24
Replies: 4
by MissSpentYouth » 10 Apr 2026, 20:02

Hi All,

Just doing some research into a 2.0 mkIII golf GTi engine swap into a T25.

The mechanical side seems well documented and appears...

4 Replies

56240 Views

Last post by Resynth
01 Jul 2026, 13:24
AGG conversion wiring diagrams? Lambda on Elvis.

Last post by Resynth « 30 Jun 2026, 21:23

by Resynth » 30 Jun 2026, 21:23

I just bought a T25 with an AGG engine installed with what I am told is an Elvis loom .
Really like the van but it's not running super great and...

0 Replies

3943 Views

Last post by Resynth
30 Jun 2026, 21:23
Whining when accelerating

Last post by silverbullet « 17 Jun 2026, 16:47
Replies: 1
by peteandnero » 25 Feb 2026, 16:43

Hi,
my AFN TDI conversion 5 speed Westfalia has recently developed a new sound. When accelerating in 4th or 5th there is a woooo type noise which...

1 Replies

126154 Views

Last post by silverbullet
17 Jun 2026, 16:47
Clutch judder at low rpm

Last post by mioba « 11 Jun 2026, 17:48
Replies: 7
by slowcoach » 30 May 2026, 20:58

I've got a fairly repeatable judder when pulling away in 1st or second, at low ish revs, particularly when it's cold, or not been running long. Seems...

7 Replies

3031 Views

Last post by mioba
11 Jun 2026, 17:48
AGG GTi conversion for my old diesel Vanagon...

Last post by TwinTurbo « 05 Jun 2026, 06:22
Replies: 2
by SunsetVanagon » 04 Jun 2026, 11:57

Hello everyone, this is my first post on here, so please be gentle....

I've got the AGG engine out and am just prepping it with a new timing belt...

2 Replies

2962 Views

Last post by TwinTurbo
05 Jun 2026, 06:22
EJ20 Engine Overheating - Solutions?

Last post by Basilakios « 01 Jun 2026, 16:35
Replies: 25
by Basilakios » 12 May 2026, 15:20
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Last year I bought my T25 which has an Subaru EJ20 engine conversion. I don't know much about the engine but it was done by Steph at Mac VW and I...
25 Replies

18190 Views

Last post by Basilakios
01 Jun 2026, 16:35
AFN expert Needed - Cash waiting lol

Last post by 16vmini « 01 Jun 2026, 11:13

by 16vmini » 01 Jun 2026, 11:13

Money waiting for an AFN expert to come and get my AFN engine running again , it died as i driving it last year , i went through all sorts now ,...

0 Replies

5926 Views

Last post by 16vmini
01 Jun 2026, 11:13
1.9 AAZ engine

Last post by mrhutch « 26 May 2026, 10:11
Replies: 2
by dcworm57 » 24 May 2026, 07:21

I’ve recently bought a Syncro , it’s got 1.9 AAZ TD engine in it . The engine has had a full rebuild by a German firm in the last 12 months I have...

2 Replies

3095 Views

Last post by mrhutch
26 May 2026, 10:11
Ford Mondeo st220 into '88 Caravelle

Last post by R0B « 22 May 2026, 13:12
Replies: 78
by Dueller » 04 Jul 2023, 20:40
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Starting this thread to document my thoughts and journey here, hope it helps someone else who's having some ideas but not jumping in for whatever...
78 Replies

433923 Views

Last post by R0B
22 May 2026, 13:12
AAZ hot starting problem

Last post by colinthefox « 20 May 2026, 21:05
Replies: 3
by morganite » 19 May 2026, 12:21

AAZ engine, just rebuilt the engine, rebuilt injector pump,injectors, glow plugs,fuel line with non-return valve,Starts first turn when cold, when...

3 Replies

2639 Views

Last post by colinthefox
20 May 2026, 21:05
Coolant issues

Last post by mioba « 18 May 2026, 22:26
Replies: 12
by BarnyE » 28 Feb 2026, 13:59

Hi, I’ve been rebuilding my van for the last 12 months, it got delivered on a trailer and I’m almost ready for its first test.

But I’m having an...

12 Replies

28450 Views

Last post by mioba
18 May 2026, 22:26
Exhaust Heat Shield

Last post by mioba « 18 May 2026, 22:17
Replies: 2
by Burtybassett » 08 May 2026, 08:07

Morning all.

I need to make a heat shield for the exhaust on my 1983 Vanagon as I need to protect the engine from the heat.
This is a Tdi...

2 Replies

7268 Views

Last post by mioba
18 May 2026, 22:17
Replacement intake/throttle seal

Last post by Aidan « 16 May 2026, 15:11
Replies: 4
by Nelpy » 24 Jun 2024, 18:37

One for the Subaru people

I'm looking for a new seal for where the air intake attaches to the throttle body as pictured. It is a 2001 Legacy H6...

4 Replies

32441 Views

Last post by Aidan
16 May 2026, 15:11
Replacing EJ22

Last post by silverbullet « 14 May 2026, 06:44
Replies: 3
by mariner » 10 May 2026, 20:39

Hi all. I'm considering replacing my Subaru engine for a newer version and would be interested in people's thoughts and opinions.

I bought my van...

3 Replies

8809 Views

Last post by silverbullet
14 May 2026, 06:44
Starter bolts for a 1.9D

Last post by shampooefficient « 11 May 2026, 07:53
Replies: 2
by shampooefficient » 10 May 2026, 17:17

Currently persuading new lump into old engine bay.

Got the engine hung and gearbox bolted on. Trying to fit the refurbed starter from the original...

2 Replies

8359 Views

Last post by shampooefficient
11 May 2026, 07:53
1.9 AAZ engine manual

Last post by hubcap61 « 06 May 2026, 15:09
Replies: 4
by dcworm57 » 05 May 2026, 16:22

Just picked up a van it has. 1.9 AAZ TD engine . Which manual do I get that covers this engine , Bentley or is there another ?
cheers

4 Replies

8146 Views

Last post by hubcap61
06 May 2026, 15:09
Black smoke on acceleration.

Last post by silverbullet « 26 Apr 2026, 20:00
Replies: 8
by DarrenC90 » 11 Apr 2026, 19:10

Hi all, thanks for any help in advance.
So 1.9TD Aaz vanny. Replaced head gasket, valve stem seals, injector nozzles (pop tested to within 5bar or...

8 Replies

109084 Views

Last post by silverbullet
26 Apr 2026, 20:00
Type one engine instead of CT?

Last post by R0B « 22 Apr 2026, 09:14
Replies: 55
by fall-apart-dave » 07 Apr 2011, 18:19
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Has anyone ever put a type one engone into a T25 in place of a CT?

I have found a few sites that discuss the details, and am confident that the...
55 Replies

130987 Views

Last post by R0B
22 Apr 2026, 09:14
Injector thread broken off on cylinder head (engine). What now?

Last post by meeh85 « 12 Apr 2026, 16:35
Replies: 9
by meeh85 » 10 Apr 2026, 09:43

Hi.
Greetings from Norway. I will try to explain in english..... :) And thanks a lot for reading this !!!

I have a 1989 VW T3. It’s supposed to...

9 Replies

53826 Views

Last post by meeh85
12 Apr 2026, 16:35
Headache trying to bleed my fuel pump

Last post by axeman « 06 Apr 2026, 16:54
Replies: 5
by aimlessrock » 05 Apr 2026, 07:39

I changed the fuel filter in my van (1.9 AEF diesel) and I just can’t get the van to now start.

Any tips on how to best bleed the pump?

Thanks

5 Replies

6959 Views

Last post by axeman
06 Apr 2026, 16:54
Temp sensor retaining clip hell(p)

Last post by redsnapper « 04 Apr 2026, 19:41
Replies: 17
by redsnapper » 31 Mar 2026, 17:10
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Hi all,

Not posted on here for a long time but regular browser for solutions but can't find an answer to this and feel I am just being an idiot

1Y...
17 Replies

14967 Views

Last post by redsnapper
04 Apr 2026, 19:41
TSR engine conversions question

Last post by mrhutch « 27 Mar 2026, 15:48
Replies: 2
by Swordfish93 » 27 Mar 2026, 08:00

Has anyone used them recently? I see bad reviews from quite a few years ago and want to know if they have changed there ways or not

2 Replies

27587 Views

Last post by mrhutch
27 Mar 2026, 15:48
Which gearbox.

Last post by cobblers « 14 Mar 2026, 15:47
Replies: 5
by HappyCamper » 13 Mar 2026, 13:24

Hi, Anyone know what the best gearbox would be best to run with a golf agg engine. I'm presuming the original 1.6 diesel box will be too low gearing,...

5 Replies

34820 Views

Last post by cobblers
14 Mar 2026, 15:47
T25 Engine Swap HELP...

Last post by Stesaw « 04 Mar 2026, 13:16
Replies: 27
by monsterVW1982 » 18 Apr 2011, 10:09
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Hi all,

After a little bit of advise with selecting a new enginer, gearbox and a turbo for my van after the current engine give up the ghost on the...
27 Replies

82137 Views

Last post by Stesaw
04 Mar 2026, 13:16
oil pump/vacuum pump problem

Last post by Aidan « 02 Mar 2026, 18:55
Replies: 2
by morganite » 28 Feb 2026, 21:21

Hi, need some help please! AAZ conversion, lost the oil pressure because the new 2,000 ml 1.9td oil pump male tang was,nt reaching into the female...

2 Replies

18128 Views

Last post by Aidan
02 Mar 2026, 18:55
AHU turbo question

Last post by hotpod « 27 Feb 2026, 15:46
Replies: 9
by hotpod » 12 Feb 2026, 10:56

I have an AHU engine with a KKK turbo which has a pipe from the compressor to the N75 and one from the N75 which goes back to the turbo to operate...

9 Replies

32143 Views

Last post by hotpod
27 Feb 2026, 15:46
1y identification

Last post by davidoft1 « 12 Feb 2026, 10:47
Replies: 9
by BarnyE » 08 Feb 2026, 10:16

I have a 1900 1y conversion in my van and want to do a belt change on it.
Unfortunately I don’t know the source of the engine. I’m looking at serial...

9 Replies

31070 Views

Last post by davidoft1
12 Feb 2026, 10:47
CS to AGG engine swaps

Last post by cobblers « 30 Jan 2026, 09:06
Replies: 2
by HappyCamper » 29 Jan 2026, 18:54

Hi, I was looking for info, on changing a CS diesel engine for an AGG. There seems to have been plenty done, but I can't see much info. I've tried...

2 Replies

23299 Views

Last post by cobblers
30 Jan 2026, 09:06
Which petrol engines.

Last post by axeman « 16 Jan 2026, 17:44
Replies: 9
by HappyCamper » 09 Jan 2026, 13:56

Hi, a few more questions on engine swaps. I've seen info on swapping from diesel to petrol. The good thing is I'm more comfortable working on petrol...

9 Replies

40018 Views

Last post by axeman
16 Jan 2026, 17:44
1.9 Tdi upgrade , issues , solutions

Last post by HappyCamper « 08 Jan 2026, 11:14
Replies: 10
by dcworm57 » 27 Nov 2025, 15:33

I’m considering 1.9 Tdi upgrade to my 1.6jx westy . It’s now on Brickwerks high lift kit and I’m told by various sources that 1.9 Tdi wont work on...

10 Replies

38258 Views

Last post by HappyCamper
08 Jan 2026, 11:14
Diesel Injection Pump.

Last post by lefty67 « 18 Nov 2025, 19:17
Replies: 1
by Burtybassett » 15 Nov 2025, 16:49

Hiya 👋

Does anyone know of anyone that would/can refurb a Diesel Injection Pump ?
1.9TDi - AHU Engine
Think it's a Bosch pump - 028 130 115 M...

1 Replies

25750 Views

Last post by lefty67
18 Nov 2025, 19:17
Coolant Type for Subaru EJ20 Engine Conversion

Last post by Basilakios « 24 Sep 2025, 12:13
Replies: 7
by Basilakios » 17 Sep 2025, 11:45

Another week and another new problem to deal with.

I've not had this T25 campervan for long and barely driven it anywhere due to an ongoing issue...

7 Replies

45573 Views

Last post by Basilakios
24 Sep 2025, 12:13
AAZ diesel pump leak

Last post by Al Housman « 13 Sep 2025, 20:28
Replies: 5
by Al Housman » 13 Sep 2025, 14:58

The truck is finally going after being stood for about 2 years and sounds really good.

There is however a steady leak from under the diesel pump. I...

5 Replies

39676 Views

Last post by Al Housman
13 Sep 2025, 20:28
AFN TDI Obd scanner

Last post by Robsey « 07 Sep 2025, 20:53
Replies: 3
by fh9977 » 04 Sep 2025, 12:31

Hi, would anyone be able to recommend an OBD device I can connect to the port of an ATF TDI engine to read live data? Is it possible to have a...

3 Replies

38105 Views

Last post by Robsey
07 Sep 2025, 20:53
Retro fit engine from a Golf GTI to a 1.9

Last post by Ukjamie82 « 04 Sep 2025, 13:00
Replies: 5
by Ukjamie82 » 02 Sep 2025, 06:09

Good morning all

I am in the throws of retro fitting a 1.9 water cooled engine from a 1.8 Golf GTI , reason , ecu failed and could not find a...

5 Replies

40092 Views

Last post by Ukjamie82
04 Sep 2025, 13:00
T25 legacy conversion wiring loom issue

Last post by ManicGTI « 03 Sep 2025, 21:13
Replies: 2
by Paul1981 » 27 Aug 2025, 20:37

Hi everyone
Please can anyone advice me on where i can source a wiring diagram for a 3 pin ECU connection from a Subaru Legacy. I’m not sure what...

2 Replies

37340 Views

Last post by ManicGTI
03 Sep 2025, 21:13
Throttle Potentiometer Issue

Last post by TwinTurbo « 16 Aug 2025, 12:36
Replies: 6
by Nistorph » 21 Jul 2025, 20:40

Hi,

I’m looking for some guidance please.

I have a T25 fitted with a 1.9 AHU TDI lump. It now, with increased frequency, reverts to some sort of...

6 Replies

649757 Views

Last post by TwinTurbo
16 Aug 2025, 12:36
Part Identification

Last post by Oldiebut goodie « 13 Aug 2025, 14:01
Replies: 7
by Bison535 » 13 Aug 2025, 10:13

Early Bay T2 with petrol engine 1.6 has difficulty in running and suspect a ‘sensor’ fault!?! Have removed this Sensor Unit but cannot identify which...

7 Replies

43271 Views

Last post by Oldiebut goodie
13 Aug 2025, 14:01
Glow plugs T3 tdi

Last post by Simon Baxter « 11 Aug 2025, 13:10
Replies: 3
by Kougar38s » 24 Jul 2025, 10:56

Hi all, I'm a new member and a new owner of a 1989 T3 tdi 1.6.
I wonder if any one can help with a problem I'm having. Its only just started. The...

3 Replies

41389 Views

Last post by Simon Baxter
11 Aug 2025, 13:10

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