Problem with my tdi!

[mcouldrey]

G'day all.

I've previously posted in the Caddy forums and had some helpful answers but I'm still stuck.

Short version, my brother put ULP in my diesel and drove 65kms. We got it towed and flushed, replaced filter etc. we ended up replacing the injectors, wiring loom, injector seals, bolts, fuel sending unit and fuel pump. Al by process of elimination.

During the elimination the car would often start and later stall after a while and struggle to start whilst warm.

We finished all the work yesterday by replacing the seals and bolts for the injectors.

Took it for a drive and it had full power and was going great. Went all speeds and sat on 100kms for a while. I slowed and sped up and it coughed a bit and stalled. Wouldn't start straightaway so we towed it back. Once back, and still warm, we turned it on and after 15 secs of trying to start it, it turned over and drove. We then stopped it and it started start away.

Can anyone suggest anything? I believe the new injectors do not need to be coded, can anyone confirm this? Any suggestions are appreciated. We are stumped!!!

Cheers Matt

[Greg Roles]

On the MK6 engine onwards the injectors do need to be adapted in Vag Com, but I can't see that being a major thing, from what I understand it simply allows for manufacturing tolerances, and maximises economy and power.

[Pokie]

Year , engine? Pumps duesa? Or unit injectors?

[mcouldrey]

2007 3 door caddy 1.9L tdi unit injectors

[Umai Naa!!]

Fuel leak before the injectors?

[Snail Style]

Probably wasn't bled 100%.

[mcouldrey]

Thanks for everyone's reply. Is there a 'correct' way to bleed the lines? There was no issue with the car prior to the ulp going in, so I can't see it being anything else. Cheers

[Snail Style]

Run the pump via a scan tool(VCDS) and the system self bleeds. Then once you get it running just take it on a good drive with the revs up and all should be good.

Also might help to scan it for faults as that might point you in the direction of something else.

[gldgti]

In my experience a good working system will self bleed cranking and should be fine after that.
The intermittancy of the fault would seem to indicate an electrical fault injector loom perhaps, but theres no 'common' fault with the 1.9 like there is with the 2.0l 16V engines), or an air leak before the tandem pump which is introducing air into the system at variable rates.

[Umai Naa!!]

1.9s still have the occasional loom issue, but not as common as the 2.0s.

Has this ever at all been scanned for codes since the initial miss-fuelling occured? If you've got no idea where to start looking, you'll be forever throwing parts at it, wasting your time and money. Get a cheap OBD scanner off eBay, even a basic Autel one. Use that to help you find where the problem lies.