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Discussion Starter #1
Morning all,

Last night I was on a long drive when I pulled up at the lights and small but noticeable wisp of my own grey smoke came passed me. Earlier in the day I'd noticed the van (1.9 tdi) was struggling to get up hill. Sadly, I had to drive about 400 miles like this yesterday, but i did make it home.

This morning, I've checked all the pipes and hoses around the intercooler, off the N75 to the turbo, boost nipples and everything looks fine. The fuel filter was replaced only a couple of weeks ago. The brakes aren't binding or anything....... Where else should I look?
 

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Need to the the code reader on mate. Mine was much the same and turned out the intercooler was shot.
 

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Normally if it’s inter cooler or one of its pipes it tends to be black smoke. Grey smoke tends to be burning oil or turbo. What’s your oil level like, any gunk in the cap? Could be worn piston rings
 

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Morning all,

Last night I was on a long drive when I pulled up at the lights and small but noticeable wisp of my own grey smoke came passed me. Earlier in the day I'd noticed the van (1.9 tdi) was struggling to get up hill. Sadly, I had to drive about 400 miles like this yesterday, but i did make it home.

This morning, I've checked all the pipes and hoses around the intercooler, off the N75 to the turbo, boost nipples and everything looks fine. The fuel filter was replaced only a couple of weeks ago. The brakes aren't binding or anything....... Where else should I look?

I've just bought a 1.9 tdi Caddy, suspected turbo fault. Checked all vac pipes, intercooler, turbo arm and a VCDS scan came up with low boost.

Getting grey smoke the same as you, only for a bit and then it clears, everything points to the turbo at the moment, booked it in with a specialist to have a look and will take it from there. Looked at doing the turbo myself, after getting underneath I decided to pay someone to do it for me.
 

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Discussion Starter #6
Intercooler is barely six months old,

Oil level has dropped....... A lot.......

I going to go and take some pipes off in second and see what's going on with that fan....
 

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Discussion Starter #8
Didn't get chance today...... Got to start replacing the engine in my Transit tomorrow so I'll have some kit out for that anyway.... Will keep you updated.

Thanks 👍
 

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My crystal ball needs cleaning so no ideas o_O

grey smoke is usually un-burned fuel so a bad injector (or more??) or headgasket / compression issue?

Rich.
 

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Discussion Starter #10
Im still none the wiser either.

Turbo is giving loads of boost, managed to blow an intercooler pipe when I accidentally stamped on the throttle, so turbo must be spooling up fine.

Ive just checked the timing and everything there is dead on.

No water loss, im beginning to think the oil loss is not related and it may just have been low to start with. Exhaust smoke smells very "dieseley" and ive just realised that I would have expected better fuel consumption a full tank. Ive done 470 miles on a full tank where as I would normally expect 550 out of a tank. This is a fuel issue...... isnt it?

Hopefully ive got a guy coming to scan it tomorrow and see what it says but the local scrapyard has a Tdi Sharan and Mk3 Golf in stock so I hope to take the injectors and/or pump of one of them if need be.

Do the injectors and the pump have to be "paired" or will the injectors just be a straight swap?
 

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Im still none the wiser either.

Turbo is giving loads of boost, managed to blow an intercooler pipe when I accidentally stamped on the throttle, so turbo must be spooling up fine.

Ive just checked the timing and everything there is dead on.

No water loss, im beginning to think the oil loss is not related and it may just have been low to start with. Exhaust smoke smells very "dieseley" and ive just realised that I would have expected better fuel consumption a full tank. Ive done 470 miles on a full tank where as I would normally expect 550 out of a tank. This is a fuel issue...... isnt it?

Hopefully ive got a guy coming to scan it tomorrow and see what it says but the local scrapyard has a Tdi Sharan and Mk3 Golf in stock so I hope to take the injectors and/or pump of one of them if need be.

Do the injectors and the pump have to be "paired" or will the injectors just be a straight swap?
No they don't! It's best to calibrate injectors so they run nice and smoothly in all RPM range the same. Sounds more like unburned diesel to me. Leaky injector can cause that. Or bad temp sensor. Have you had a some kinda remap or maybe chip'd it?
 

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Discussion Starter #12
No remap, no chip. I did send the ecu away to have the immobiliser deleted but the guy said it was the type of ECU that couldnt be altered for performance benefits.... I dont know anymore than that but no, it hasnt been altered.

Where is the temp sensor? That might be the next place to look.
 

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Depends on which car the engine came from but have a look her its marked with B:
Its ether square type connector or half round. 4 wires connector.

 

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Discussion Starter #14
Oh that, cant remember where mine is, the engine came out of a B4 Passat.

Im just thinking that all this nonsense started when I tried to runb the van on Veg Oil and it conked out quite quickly.

Being as that was where this journey began, im guessing the injectors and pump are what need investigation.
 

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Veg oil has water in it and since the injection pump uses diesel as to oil the internals. Water is heavier and always lands at the bottom and it rusts.
 

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Discussion Starter #16
Mine shouldnt have water in it....... due to the simple "Uri Geller" device I have when cleaning my Veg Oil up. This engine wont have had more than a couple of litres of Veg oil through it before it threw a wobbler anyway.

Just a guy over to read the faults. Hes a very well respected diesel and auto electrics boff around here. He didnt really bother looking at his laptop. As soon as he heard the van cranking over he said its a valve stuck open. All injectors squirting fine, but you can hear there's no compression on one cylinder when its cranking over.

So...... the question now is shall I compression test or just get the head off and get it rebuilt? and...... can I release some extra horses with some mods while the head is off? :):cool:
 

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Due to the rubbish new forum interface we/i don't know what model your van it is, if its a t4 then a stuck valve is a serious issue, if a t5 then its a worn out cam...
 

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Due to the rubbish new forum interface we/i don't know what model your van it is, if its a t4 then a stuck valve is a serious issue, if a t5 then its a worn out cam...
It quite clearly says at the top of the page it’s in the T4 section under the sub heading engine and gearbox and the OP says it’s a 1.9tdi so narrows it down to the engine in the t4
 

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The information is there but there has been a suspisious amout of t5 posts in here since the change so there is some confusion somewhere.
 
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