scream from engine when on boost!

hi guys, just a brief description of problem.

took my wifes 2006 freelander sport for a serious off roading trip today. (its used to school run trips) i got the pi** taken from me at first with my 18" wheels when i met up with friends in their modded defenders and ranges, but i did really well. the 4x4 system is under rated in this car.

anyhow on the way home i lost all power (boosted power) so was having to be gentle on the throttle when building up speed (struggled on hills big time)

got the car home. ran diagnostic scan. no codes.

checked boost hoses. no obvious ploblems (ive had an intercooler hose pop off before so know what that feals like)!

so i took the car out for a spin again, this time boost power is back strait away, but, on hard boost if i reliease throttle slowly the car bucks! and there is a very loud scream coming from engine when on full boost. (i suspect boosted gasses. perhaps egr fault?)

im going to check vaccum hoses tomorrow. any other advice guys?

the freelander did so well. just ended in a low with this engine fault.

thank you.

spencer

Hello friend.

Defo a loose or split hose. Check all couplings and hose on the induction system

ok ill get to it first thing. i hear that the small hoses can split often.

hope is a simple fix. wife is NOT happy with my. she loves her freelander.

Has it lost power and sounds like a dentist drill??

Your (wife's) car is just the right age to have tired turbo hoses.

Nothing to do with miles - they just age, become porous and/or split.

Get someone to hold the revs around 2500 and feel all around the main turbo hoses for splits that look as if they were made with a Stanley knife.

Especially the 90 degree bend one that attaches to the EGR and on the back of the long hose on the left where there is a screw that can rub against it.

The splits open up when under boost - so if they were age-weaked all that has happened is that you've 'pressed the loud pedal' harder than your wife is in the habit of doing. Naughty boy!

If you're going to make a habit of this - get some silicone hoses - much stronger.

Singvogel.

Had exactly this fault today on a Freelander...

The turbo was running at full boost at anything above 2500rpm, around 150kPa (1.5 bar in old money) and was screaming with any throttle input at all.

Check the turbo actuator is moving. If this is moving OK, check the wiring to the VNT solenoid. If this is all OK, try replacing the solenoid itself, they are fairly common for failing

HTH

thanks for all your feed back. ill check the boost solinoid and boost hoses. i suspect (hope to find a split hose) i had a split hose as you described on my td mg zs.

it just dosent quite feel like split hose symtoms. you typicaly get a huge woooosh noise from the split hoses, im getting a screach noise. i might be small hose from actuator or somthing.

still dont know why i did loose all my power at first. then it comes back upon engine shut down and restart. (and now the noise under boost)

see what i find tomorrow...

ill report back.

spannerspencer said:

still dont know why i did loose all my power at first. then it comes back upon engine shut down and restart. (and now the noise under boost)

Click to expand...

Because the turbo is boosting so hard, the engine management shuts everything down to prevent any damage

disco_mikey said:

Because the turbo is boosting so hard, the engine management shuts everything down to prevent any damage

Click to expand...

this is what i hope and i would believe.! im sure you are right..


...... time to pop the hood.....

spannerspencer said:

this is what i hope and i would believe.! im sure you are right..


...... time to pop the hood.....

Click to expand...

Oh you're Jewish? Bit late in life to be getting a that done isn't it?

Te he

strange_days said:

Oh you're Jewish? Bit late in life to be getting a that done isn't it?

Te he

Click to expand...

never to late for anything

ok so checked all the big boost pipes around intercooler. and i removed and cleaned egr valve. i checked the braided vaccum line on egr valve and that seems ok.

i havnet checked the actuator vaccum lines yet. difficult to see the turbo down the back.

anymore help from anyone?

im sure my turbo whistles more than it uses too. and this loud whistle/scream i get on full boost/rev is doing my head it.

hate jobs that anrt simple to fix.

ill check the turbo boost solinoid and pipe next. is it likely to be these? its a ball ache to get to turbo.

spannerspencer said:

anymore help from anyone?

im sure my turbo whistles more than it uses too. and this loud whistle/scream i get on full boost/rev is doing my head it.

hate jobs that anrt simple to fix.

ill check the turbo boost solinoid and pipe next. is it likely to be these? its a ball ache to get to turbo.

Click to expand...

Take it to a garage, pay someone else to fix it

try checking the turbo linkage is free to move, quite a common fault

john t said:

try checking the turbo linkage is free to move, quite a common fault

Click to expand...

ill check out turbo linkage next. the car seems to over boost, as after a short while of "over boosting" the freelander seams to go into a limp mode (no boost) untill i stop and start the engine. then i get boost back again.

a stuck actuator arm would make sence.

have you checked the map sensor?

Freelaner said:

have you checked the map sensor?

Click to expand...

Excuse my ignorance - but where exactly is the MAP sensor on a TD4?

I know where it is on a 1.8 petrol (and I don't even have one of those) but I've never thought of checking it on my TD4.

Singvogel.

Singvogel said:

Excuse my ignorance - but where exactly is the MAP sensor on a TD4?

I know where it is on a 1.8 petrol (and I don't even have one of those) but I've never thought of checking it on my TD4.

Singvogel.

Click to expand...

left hand side of the inlet manifold

and Land Rover call it a boost pressure sensor, so some refer to it as either a MAF or a MAP

That may be the MAF you are thinking about, MAP in located in L/H side as you look at engine in underneath inlet manifold, were not the later ones fit into hoses

booboodag said:

That may be the MAF you are thinking about, MAP in located in L/H side as you look at engine in underneath inlet manifold, were not the later ones fit into hoses

Click to expand...

No, I didn't mean the MAF (Mass Air-Flow) sensor - I know about that - I've changed my Bosch one for a Pierburg when I fitted a Synergy2a.

I was enquiring about the location of the MAP (Manifold Absolute Pressure) sensor, as I've never had any cause to touch it.

SV.