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Discussion Starter #1
Hi there. Wonder if any wiz out there can help.
I had a fuel pump leak so my garage took it out sent it to a specialist, they fixed it and the garage replaced the fixed pump, new belt etc.
Since then every time I pull up at traffic lights or end of a road the revs fluctuate four or five times. Idle sits under 1000 and the fluctuations hit 1000, van shakes a bit when this happens too. Took the van to back to the garage but they say they can’t find the issue as my OBD isn’t connected. The guy I bought the van off changed the engine out so he may have not re attached. The garage think it’s an injector leak? I’m gonna try and load up a video for you to watch. Any ideas would be a great help. The fuel pump ended up being over £1k and I haven’t got the dosh to go back into the garage for them to tinker. My van is a t4 800 special year 2000.
cheers
Emma
P.s I’m in north / east London. If anyone could recommend a good garage for vw’s that would be even better.
 

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This forum sucks.
correct, too many people lead their first posts with a tec question & no supporting info, those of us who read said questions usually have ideas as to the causes BUT without a working crystal ball are unwilling to comment in case it's not the correct answer & we get bullshitted as a result 🤡

so......

your van is an '800special'? so 1.9 td engine?

the NON-tdi OR petrol t4's didn't have obd comunications to thir mecanical throttle engines, t4B models (post '96) have an obd socket as standard but this is connected to immobiliser / abs / airbag / speedo cluster etc. if fitted with such not always having an engine 'k' line connection.

you say the engine has been changed by the previous owner? is it the origonal type 1.9td (ABL code 'IDI' engine. - mecanical throttle) has it been replaced with a car derived 1.9tdI (1Z or AHU code 'Tdi' engine - electronic 'fly-by-wire' throttle & ecu control)

upload decent quality & large resolution photo's of the enginebay (imgur for example) as these will help identify IF you do not know(y)

then maybe someone might help, obviously if they can be bothered🍿

Rich.
 

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Discussion Starter #4
Ha cheers Rich. I know it’s a SEAT engine that went in and older than the original. I’ll take a photo when I can and upload and answer the other questions. 1.9 td engine is correct.
Thanks
Emma
 

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Agree with Hybrid 800.We cant venture an opinion unless we have much more information than posters at first put .A lot of new owners think ,yea,Ive got aT4 (cool?),but what is T4 ?All they have in common is a particular shape of tin box ,and that is even before people start modifying them . It is almost like having forty different types and some of them (eg petrols and automatics ) I have no knowledge of ,except in the most general terms.
 

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Discussion Starter #8
Just posted photo of the engine and also a document of what engine has gone in.
Let me know if you need anything else.
Cheers
 

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That has been very well fitted by someone .The silver box on the right of the picture looks like an electronic control unit ,which might be where the answer lies .
 

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The "box" on the right is the ECU for the TDi engine.
Possibly the original TD used the alternator to feed the rev counter, but I don't know.

Wait until Rich (hybrid800) comes back with a more definitive answer. (Never known him to be wrong!)
 

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Going by the pictures and the engine no. from the Seat, it’s an AHU conversion. That MSA15 ECU still gives me nightmares. IIRC, Gaz you’re spot on with the ta go feed coming from the alternator, though it’s been a while since I’ve touched mine (literally years) and I can’t remember whether the ECU takes the engine speed signal from the W feed or the trigger wheel/crank position sensor.

That said, I think the idle hunting issue is a related to the pump. Is there a way the OP can get the diagnostics port at least bodged in? A wire from the ECU (the PIN number escapes me) to the k-line junction box should hopefully do the trick.

Whoever did the conversion has done a massive disservice by not connecting up the OBD port, it’s only a couple of wires; easily done when making up the loom but a bit of a nause to retrofit neatly.

Worst case scenario, I could give it a once over when I have a few moment (not as often as I’d like at the moment) as I’m not far over in New Cross.
 

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Discussion Starter #12
Thanks for all your inputs. I’ve managed to upload a video of the issue on YouTube here is the link

LawAnderson - I’ll happily take you up on the offer please. Do you have a garage, can I get it booked in with you? Would much rather someone look at it with vw knowledge. My garage sent the pump off elsewhere to be fixed so I don’t have much confidence in them taking it forward. Unless it’s their issue and they need to fix the pump of course. Thanks
Emma
 

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Discussion Starter #13
correct, too many people lead their first posts with a tec question & no supporting info, those of us who read said questions usually have ideas as to the causes BUT without a working crystal ball are unwilling to comment in case it's not the correct answer & we get bullshitted as a result 🤡

so......

your van is an '800special'? so 1.9 td engine?

the NON-tdi OR petrol t4's didn't have obd comunications to thir mecanical throttle engines, t4B models (post '96) have an obd socket as standard but this is connected to immobiliser / abs / airbag / speedo cluster etc. if fitted with such not always having an engine 'k' line connection.

you say the engine has been changed by the previous owner? is it the origonal type 1.9td (ABL code 'IDI' engine. - mecanical throttle) has it been replaced with a car derived 1.9tdI (1Z or AHU code 'Tdi' engine - electronic 'fly-by-wire' throttle & ecu control)

upload decent quality & large resolution photo's of the enginebay (imgur for example) as these will help identify IF you do not know(y)

then maybe someone might help, obviously if they can be bothered🍿

Rich.
correct, too many people lead their first posts with a tec question & no supporting info, those of us who read said questions usually have ideas as to the causes BUT without a working crystal ball are unwilling to comment in case it's not the correct answer & we get bullshitted as a result 🤡

so......

your van is an '800special'? so 1.9 td engine?

the NON-tdi OR petrol t4's didn't have obd comunications to thir mecanical throttle engines, t4B models (post '96) have an obd socket as standard but this is connected to immobiliser / abs / airbag / speedo cluster etc. if fitted with such not always having an engine 'k' line connection.

you say the engine has been changed by the previous owner? is it the origonal type 1.9td (ABL code 'IDI' engine. - mecanical throttle) has it been replaced with a car derived 1.9tdI (1Z or AHU code 'Tdi' engine - electronic 'fly-by-wire' throttle & ecu control)

upload decent quality & large resolution photo's of the enginebay (imgur for example) as these will help identify IF you do not know(y)

then maybe someone might help, obviously if they can be bothered🍿

Rich.
Hey Rich,

We're all waiting for your wisdom on my T4 situ, I've added photos and a video of the Idle issue. What's my next move do you think? Get the OBD port working again? Do you think it's the pump they worked on at the garage?

Cheers
Emma
 

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My ECU has 3 fuses inside and they can corrode but mine has a plastic casing.
 
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