Thread: Defender td5 head gasket

theres a handfull of simple things that can bite you when you do the td5 head.

the injectors are coded in sequence to the ECU. but installing them in the wrong sequence shouldnt cost you that much power unless youve got the widest deviation and they manage to get the worst case scenario cockup.

the fuel pressure regulator may have stuck itself wide open and while left dry got stuck then its sorted itself, this is very uncool for getting the engine to prime correctly and give the injectors a shot at even going close to being able to do their jobs.

a sensor might have gotten a dirty conection and forced the ece to a limp mode which essentially limits you to about a 7psi boost 2.5l diesel engine which aint much.

Ive heard tell of some cases where a diagnostic check done incorrectly by an appy at a dealership have reset the computer mapping. Not sure I believe them as its got the whiff of a dealer trying to stall for time or make excuses for not getting it right the first time.

Originally Posted by discowhite

what ever the outcome, make sure you get you ''dead'' parts back!
the injectors are coded to the ecu, they havnt wiped the program or something like that???

this ones for super Tombie2 or B.A.S, send them to a pm asap.

cheers phil

Definitely getting my 'dead' parts back and I have PMed Tombie2 and tried to PM B-A-S but it says he doesn't want to receive PM's.

the fuel pressure regulator may have stuck itself wide open and while left dry got stuck then its sorted itself, this is very uncool for getting the engine to prime correctly and give the injectors a shot at even going close to being able to do their jobs.

a sensor might have gotten a dirty conection and forced the ece to a limp mode which essentially limits you to about a 7psi boost 2.5l diesel engine which aint much.

Thanks for the help Blknight. I could understand how these things might cause the problem but then you'd expect it to continue with the other injectors they tried. When they replaced the injectors with some others they had lying about it seemed to fix the problem. The problem then resumed when the old ones were put back in.

The Latest

Today I spoke with Coopers and they say that they cannot see any difference between one of the good injectors and one of the 'dead' ones. Not good when they cannot explain what the problem is. They did however source a second hand set for $1600. Oh joy another $1600. The thing is how do I know this isn't going to happen to these 'new' ones.

I rang Davis Performance Landies and spoke to one of the mechanics there and he said he's never heard of anything like this. He said that a td5 injector either works or doesn't, they never half work as these ones seem to be doing. He has also never experienced all 5 going at once.

So the mystery continues...

At worst, if they are installed in the wrong locations you just recode the ECU with the codes for the correct cylinder numbers...

I agree with Blknight that a dry fuel pressure regulator is possible..

I dont believe a catastrophic 5 injector failure is possible, unless they were totally mishandled by the mechanic that removed them.

Harlie on this forum has a mate who rebuilds them, find him and PM him, he should be able to put you onto the guy he knows...

But something seems very wrong with this diagnosis, almost a cover up of an error...

I went back to Coopers with all the various suggestions and Ward explained everything they have done to diagnose this problem. It seems they have covered every base and been very thorough - they have put about 24 man hours into this problem.

The fact that when they replace my injectors with their spare set the problem goes away. They then put mine back in and the problem returns. Back to the replacements and the problem solved again. One could only assume there is some unexplained anomaly and it could only be attributed to the injectors. He has only ever seen this happen 3 other times and each of those was with a head removal. The only reason they considered the injectors was because of a previous incidence of an unexplainable injector failure.

I have PMed Harlie and hopefully his mate can shed some light and perhaps even repair my injectors and I can then sell them to the next unfortunate soul that has this problem occur. Maybe I should go and buy a lottery ticket. I mean what are the odds? How many td5's are there and I am 1 of only 4 out of 1000's that this has happened to. It must be my lucky day. Perhaps it might pay for the job.

Thanks to you all for all the help and suggestions. Hopefully I can get some further information and possibly some answers from Harlie's mate. If so I'll post any further findings here.

Cheers

Josh