D4 MY14 TDV6 misfire

[John97e]

Hi all
Long time follower of the forum, first time poster.

Our Discovery 4 developed a slight miss a few weeks ago. No noticeable loss of performance, increased mileage or smoke, but on a cold start there's a definate clapping of either an injector or lifter (prob a lifter tbc) for a few seconds around the cyl 4 area, and it is slightly lumpy through all revs/loads. To be fair there is a slight tick with engine running but not really noticeable.

I did a relative comp test- all good, and i invested in a GAP iid tool but being that the car is MY14 it turns out fuel trim data isn't available. Scan shows no faults.

My next step was to try one of the LR specialists in Sydney but i'm looking at late June-July before anyone can get me in. I've alway done my own spanner work so i don't have a relationship with anyone unfortunately

I've struck out finding anyone reporting this issue on an MY14+ on the forums, so am reaching out in the hope someone can point me in the direction of a next step.

Many thanks
John

[josh.huber]

If you passed relative compression. You can try to rule out an injector by swapping it out with one on the other bank to try to move the noise significantly. The gap tool will allow you to swap the trim codes and leave it in the new position if it doesn't help. While it's out you can put a bore scope in the hole to have a look if need be. You should be able to get new injector washers locally to do that job.

[Eric SDV6SE]

Perhaps related, the rear timing chains (from outer cam to inner cam) do rattle on start up for a few seconds before full oil pressure is achieved up there. Could be stretched chains....

I would have thought the injector pulse rate is too fast to be able to hear individual cycles.

[101RRS]

Cold starts on cold mornings - try two or three glow plug cycles before you start to see if this improves matters - maybe a glow plug issue.

[John97e]

Update of sorts. The car broke down on my wifes trip to work about 5 mins from home this morning. Shes a bit vague but says the miss was noticably louder and power was down so she pulled over and turned it off. It now wont turn over. I flat towed it home and have observed as follows.
- engine turns over as normal with a breaker bar
- torque converter is turning with the rest of the crank, this doesn't rule out a broken crank though 14+ TDV6 crank failures are more or less unheard of
-starter solenoid is throwing and starter motor is heating up with power applied
-Battery voltage drops to 11.8v with starter engaged- aok
-No fault codes on GAP other than those related to nuetral override and fail to start
Not looking for advice here just updating for those playing along at home. If there are any 14+ owners or techs out there who have experienced similar please chime in. Other than that I'll tap out on here but will provide an update as and when this is resolved, thanks

[DiscoJeffster]

All the 3L D4 do cranks - even the last 16.5 have done cranks. That said this doesn’t sound like that.

[josh.huber]

That sucks, is the starter motor turning the engine at all?

I have had some weird issues with my ecm after a manifold job if you want to pm me

[John97e]

Gave the oil filter a wash out- large volume of ferrous metal- no white metal. I'll work out how to get a photo up later
I'll scope the bores and report back, if anyone has suggestions on who/what/where for a short motor i'm all ears. I certainly dont have the gear or time to take this on

[DiscoJeffster]

Oh no!

[josh.huber]

That sucks mate, I'll have a beer for ya

[josh.huber]

I'd call all4x4 in Kotara first. Super nice people and the prices always seem pretty good.

[John97e]

I'd call all4x4 in Kotara first. Super nice people and the prices always seem pretty good.

Thanks Josh I'll start ringing around again on Monday. Need to work out whether i stand to lose too much if i just move the thing on as is or after the repower. TBH I've had a gut full. I'm religous with my maintenance and for the thing to fail at 120k, i could never put enough faith in it to do another trip let alone send the wife and kids up the shops in it

[John97e]

.

[Discodicky]

Thanks Josh I'll start ringing around again on Monday. Need to work out whether i stand to lose too much if i just move the thing on as is or after the repower. TBH I've had a gut full. I'm religous with my maintenance and for the thing to fail at 120k, i could never put enough faith in it to do another trip let alone send the wife and kids up the shops in it

At 120k and service history I'd be talking to LRA for some help. Its worth a letter quoting the relevant Service Bulletins if applicable to your failure.
You probably need to confirm the problem first of all.

[josh.huber]

Yeah dude, I love my D4 but the whole engine failure thing is a swear word. I'm all over mine like a rash. It's so good. But she's at 270k now and I'm about to buy her some injectors (ouch). The big bang seems to not be an issue anymore for long in the tooth models so I'll keep up the love. I was going to update to a 16.5 when I had money once.. Glad I didn't. I know you said the fly wheel is spinning but rock the Dampner back and forth. Just to be sure. Doesn't explain the miss though. Unless they are not related. I hope it's a broken crank and you can jam it to LR and get them to help out. Anything else and you may be lonely. Let's hope they help your wallet mate.

[John97e]

Some gentle rocking and careful eyeballing has confirmed that I now have a 2 piece crank.
I bought the car at 80k and turn my own spanners so I'm on my own as far as LR are concerned.
I've been on the phone to all the reputable indies and a few wreckers and it looks like theres no getting out of this south of $22k, thats supply and demand for you. A new long motor fitted is in the mid 40's.
Prelim research at pricing the parts and buying a hoist has me back on road for less than 10 so i will run that option to ground. Then I'll seriously look at going back on the tools full time. With what the shops are charging per/hr the boys must be getting paid well these days- rightly so

[josh.huber]

Some gentle rocking and careful eyeballing has confirmed that I now have a 2 piece crank.
I bought the car at 80k and turn my own spanners so I'm on my own as far as LR are concerned.
I've been on the phone to all the reputable indies and a few wreckers and it looks like theres no getting out of this south of $22k, thats supply and demand for you. A new long motor fitted is in the mid 40's.
Prelim research at pricing the parts and buying a hoist has me back on road for less than 10 so i will run that option to ground. Then I'll seriously look at going back on the tools full time. With what the shops are charging per/hr the boys must be getting paid well these days- rightly so

I'd be keen to see what if any damage has occurred to the block, I've always wondered about Rebuilding one that has gone bang.

[PerthDisco]

I'd be keen to see what if any damage has occurred to the block, I've always wondered about Rebuilding one that has gone bang.

Salvage Rebuilds UK on YouTube rebuilds one. Excellent video series.

[DiscoJeffster]

I find it so exhilarating to own a 3L. Every time you get behind the wheel, you never know if it’s the last time.

[SPROVER]

I find it so exhilarating to own a 3L. Every time you get behind the wheel, you never know if it’s the last time.I don't own a D4 but this made me laugh. [emoji16][emoji16]

[350RRC]

I don't own a D4 but this made me laugh. [emoji16][emoji16]

I don't own one either, but this forum is always interesting.

DL

[Discodicky]

Some gentle rocking and careful eyeballing has confirmed that I now have a 2 piece crank.
I bought the car at 80k and turn my own spanners so I'm on my own as far as LR are concerned.
I've been on the phone to all the reputable indies and a few wreckers and it looks like theres no getting out of this south of $22k, thats supply and demand for you. A new long motor fitted is in the mid 40's.
Prelim research at pricing the parts and buying a hoist has me back on road for less than 10 so i will run that option to ground. Then I'll seriously look at going back on the tools full time. With what the shops are charging per/hr the boys must be getting paid well these days- rightly so

Although you quote, turn your own spanners, unquote, if you have a history of your servicing and can show your have competence I'd still be inclined to send a lawyers letter to LRA showing your service history, their Service Bulletins, Jaguar recalls overseas, your low klms etc etc. as it would still fall into the category of "goods not fit for purpose".

Get the turbos cleaned and checked for damage plus other components, but at 120,000 klms you could get away with a "long motor" from a Reconditioner.

For the cost of such a letter I think its well worth a try. Show some inclination towards accepting some sort of pro rata warranty from them. They supply engine, you cover the rest, for example.

LRA would be hoping/gambling that many people don't put the hard words on them in such instances. Don't make it too easy for them!!

[scarry]

All the 3L D4 do cranks - even the last 16.5 have done cranks. That said this doesn’t sound like that.

Including D5's with the same engine.

[josh.huber]

Although you quote, turn your own spanners, unquote, if you have a history of your servicing and can show your have competence I'd still be inclined to send a lawyers letter to LRA showing your service history, their Service Bulletins, Jaguar recalls overseas, your low klms etc etc. as it would still fall into the category of "goods not fit for purpose".

Get the turbos cleaned and checked for damage plus other components, but at 120,000 klms you could get away with a "long motor" from a Reconditioner.

For the cost of such a letter I think its well worth a try. Show some inclination towards accepting some sort of pro rata warranty from them. They supply engine, you cover the rest, for example.

LRA would be hoping/gambling that many people don't put the hard words on them in such instances. Don't make it too easy for them!!

I love this quote, definately don't let it slip. The issue is how long they take to get back to you. You will have it on the road by then