Blowing on Disco 4

[Tom8]

Hi, car went to limp mode the other day. Recently, a sort of blowing noise from front offside wing. Not too bad, perhaps almost whistle noise. Quite smelly from fumes to cabin and in engine bay. Runs fine otherwise. No codes show on diagnostic.

Done a bit of googling and youtubing to see it can be easy access job like maff sensor all the way to cracked manifold.

Is there a logical step by step of checks to do to eliminate things (and keep cost down). Really annoying as am looking to trade in in couple of months time so really could do without this right now so need to try and fix as cheaply as I can.

Thanks

[Chris2111]

Does the noise increase when you give it more gas? Just wondering if it could be something as simple as a split hose, too much air puts it into limp mode?

[Tom8]

Chris2111 said:

Does the noise increase when you give it more gas? Just wondering if it could be something as simple as a split hose, too much air puts it into limp mode?

It whistles higher pitch yes. I am hoping it is just a split pipe, problem is finding the split one!

[andymadmak]

Either a turbo to inlet pipe, or its an inlet manifold. Pull off the engine top cover(you take the oil cap off, pop off the cover then replace the oil cap) and see if there is any damp patches immediately above the inlet manifolds in the nest of pipework/insulating materials that are there. That's often a sign. (its what happened to mine) Also, with the cover off get someone to rev the engine, you'll be more likely to track down the noise then.

If one manifold has gone, get them both done. they are never far apart when failing.

[Tom8]

andymadmak said:

Either a turbo to inlet pipe, or its an inlet manifold. Pull off the engine top cover(you take the oil cap off, pop off the cover then replace the oil cap) and see if there is any damp patches immediately above the inlet manifolds in the nest of pipework/insulating materials that are there. That's often a sign. (its what happened to mine) Also, with the cover off get someone to rev the engine, you'll be more likely to track down the noise then.

If one manifold has gone, get them both done. they are never far apart when failing.

OK thank you. I did ask local garage to take a look and did just the above. Not sure about damp patch but will double check. How much was the manifold when you had it done out of interest? Thank you.

[andymadmak]

Tom8 said:

andymadmak said:

Either a turbo to inlet pipe, or its an inlet manifold. Pull off the engine top cover(you take the oil cap off, pop off the cover then replace the oil cap) and see if there is any damp patches immediately above the inlet manifolds in the nest of pipework/insulating materials that are there. That's often a sign. (its what happened to mine) Also, with the cover off get someone to rev the engine, you'll be more likely to track down the noise then.

If one manifold has gone, get them both done. they are never far apart when failing.

OK thank you. I did ask local garage to take a look and did just the above. Not sure about damp patch but will double check. How much was the manifold when you had it done out of interest? Thank you.

I don't have the paperwork with me, but from memory I think the bits came to about £350 (including an extra "fitting kit") and the labour came to about £300. I was having all sorts done at the same time (full service, timing belts, gearbox flush etc) so the overall bill was higher, but I think that was the bit quoted for the manifolds. - it was at a specialist, not LR main dealer.

[Tom8]

andymadmak said:

Tom8 said:

andymadmak said:

Either a turbo to inlet pipe, or its an inlet manifold. Pull off the engine top cover(you take the oil cap off, pop off the cover then replace the oil cap) and see if there is any damp patches immediately above the inlet manifolds in the nest of pipework/insulating materials that are there. That's often a sign. (its what happened to mine) Also, with the cover off get someone to rev the engine, you'll be more likely to track down the noise then.

If one manifold has gone, get them both done. they are never far apart when failing.

OK thank you. I did ask local garage to take a look and did just the above. Not sure about damp patch but will double check. How much was the manifold when you had it done out of interest? Thank you.

I don't have the paperwork with me, but from memory I think the bits came to about £350 (including an extra "fitting kit") and the labour came to about £300. I was having all sorts done at the same time (full service, timing belts, gearbox flush etc) so the overall bill was higher, but I think that was the bit quoted for the manifolds. - it was at a specialist, not LR main dealer.

That's really helpful, not quite as bad as I was thinking! I'll have a look and let you know how I get on!

[andymadmak]

It made one hell of a difference too! The manifolds had clearly been on their way out for some time, but with the new ones fitted the car was much quieter, no diesel smell, 15% better economy and far, far more responsive - I guess the deterioration had just happened so gradually I hadn't properly noticed until i started to get frequent "limp modes" and that whooshing sound under load.
My car had covered just shy of 140,000 miles at that point, so i wasn't too aggrieved as this was the first large fault in all that time.