loss of boost presure when hot

[stinka]

So it goes into limp mode after its warmed up giving a fault about turbo pressure

I've had intercooler tested and its fine, replaced inlet manifold gasket, resealed throttle body, removed flap spindle from throttle body and filled holes with chemical metal.

What else could be causing boost loss after reaching full temp ?

 

[cncfabs]

So it goes into limp mode after its warmed up giving a fault about turbo pressure

I've had intercooler tested and its fine, replaced inlet manifold gasket, resealed throttle body, removed flap spindle from throttle body and filled holes with chemical metal.

What else could be causing boost loss after reaching full temp ?

Turbo:nenau

 

[stinka]

But how ?

its spins up and whistles like a goodun, no signs of damage/cracks etc

You got one btw ?

 

[cncfabs]

But how ?

its spins up and whistles like a goodun, no signs of damage/cracks etc

You got one btw ?

yes have one.what about fitting boost guage to see that your getting

 

[stinka]

yes have one.what about fitting boost guage to see that your getting

its tiny amounts mate, the ecu picks it up and puts in in limp mode, unless its over boosting :nenau

i spose it wont hurt putting one on

 

[geoffdown]

its tiny amounts mate, the ecu picks it up and puts in in limp mode, unless its over boosting :nenau

i spose it wont hurt putting one on

So how does the ecu no bout the boost problem which sensor does it use as I was sure it doesn't have a pressure sensor:nenau

 

[stinka]

So how does the ecu no bout the boost problem which sensor does it use as I was sure it doesn't have a pressure sensor:nenau

well, thats what i thought, but consult 2 said it had a turbo boost fault stored in the memory

 

[briggie]

probably monitors air flow in some way ? :nenau

 

[stinka]

I'm wondering how it monitors tho

Also there is no boost fault code listed in the workshop manual for the td27eti but there is for the zd30

I saw the fault on the consult and the guy deleted it and it kept coming back again

 

[geoffdown]

I'm wondering how it monitors tho

Also there is no boost fault code listed in the workshop manual for the td27eti but there is for the zd30

I saw the fault on the consult and the guy deleted it and it kept coming back again

Dare I say it could it be ecu problem:nenau

 

[stinka]

it could be many things but I've replaced half of the truck so far

 

[geoffdown]

it could be many things but I've replaced half of the truck so far

Try disconnecting engine temp sensor for ecu and replace with a resistor Of the right value for a cold engine and c if it goes in to limp mode or if this code comes back. Also what code does the flashing mil light bring up.

 

[stinka]

Try disconnecting engine temp sensor for ecu and replace with a resistor Of the right value for a cold engine and c if it goes in to limp mode or if this code comes back. Also what code does the flashing mil light bring up.

no flashing mil light at all, it just looses power, i turn off and on and its back to full power for 30 secs, then same again. But this only happens when up to full temp after about 6 miles or so

I've replaced coolant temp sender, the larger one which is for engine managment.

Consult 2 said all sensors were reading ok

I've replaced maf, intercooler, throttle peddle, ignition switch

 

[rayf3262]

As said, unlike the ZD30 the TD27 has no MAP sensor and a mechanical waste gate instead of a VNT turbo.

It may be that the Consult Unit was fitted with the data card for petrol engined models.
This could explain the "over boost" fault description, when in actual fact the same fault code needs to be interpreted differently for diesels.
There are a whole bunch of codes that do not translate between diesel and petrol.

What was/is the actual fault code as per the list in the EC section of the manual? Consult will give you that also.
That would probably lead to a more accurate interpretation.

 

[stinka]

As said, unlike the ZD30 the TD27 has no MAP sensor and a mechanical waste gate instead of a VNT turbo.

It may be that the Consult Unit was fitted with the data card for petrol engined models.
This could explain the "over boost" fault description, when in actual fact the same fault code needs to be interpreted differently for diesels.
There are a whole bunch of codes that do not translate between diesel and petrol.

What was/is the actual fault code as per the list in the EC section of the manual? Consult will give you that also.
That would probably lead to a more accurate interpretation.

Do you do this for a living ? are you a diagnostic guy ?

Might be worth coming to see you perhaps

 

[rayf3262]

I'm an electronics engineer working in TV broadcast systems, with an interest in engine management systems and embedded software, so no, not a diagnostic guru but I've spent enough time messing with them.

I'd be happy to stick my gear on your vehicle but I'm off to Amsterdam for the next 13 days.
In any event it's a long trek with no boost!
As a rule I spend a few days in south Manchester a couple of times a month so maybe hook up in Altrincham, but that won't be for a least 3 weeks now.

In the meantime I'd see if you can get back to the guy with the Consult unit and pull the actual fault code (as this won't care about petrol/diesel) and NOT the interpretation of it, you can do that bit from the manual.

 

[stinka]

I'm an electronics engineer working in TV broadcast systems, with an interest in engine management systems and embedded software, so no, not a diagnostic guru but I've spent enough time messing with them.

I'd be happy to stick my gear on your vehicle but I'm off to Amsterdam for the next 13 days.
In any event it's a long trek with no boost!
As a rule I spend a few days in south Manchester a couple of times a month so maybe hook up in Altrincham, but that won't be for a least 3 weeks now.

In the meantime I'd see if you can get back to the guy with the Consult unit and pull the actual fault code (as this won't care about petrol/diesel) and NOT the interpretation of it, you can do that bit from the manual.

Ok mate cheers. I will pop see the guy and try and see what cards he has in his consult and get more on the fault code.

Other than that manchester is no problem for me, go there all the time :thumb2