EGTS Up Why?

[10G]

Since doing the Canning, the EGTs on the 3 litre CRD are up higher than they've ever been.

Used to very rarely see it hit 600, now it's only got to be in the mid twenties and it hits 600.

On the Canning we suffered through very nasty corrugations, lots of mud and water.

I think the exhaust is now emitting fuf fuf fuf noise instead of the normal bop bop bop, which sounds like an exhaust leak somewhere.

So the question is, what can make the EGTs increase?

Restricted exhaust? Mud caked radiator? Buggered EGT probe? Leaky exhaust? Leaky join at dump pipe?

I've also noticed an increase in PCV smoke as well.



Thanks for any help.

[Hodge]

Have you noticed any changes in boost ??
Low boost = Egts up, as they have to be in a certain harmony .
Just a brainstorm idea . Maybe the boost controlling vacuum setup dislodged a hose or a leaking intercooler pipe somewhere due to corrugations you mentioned.

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[10G]

Boost may be down a little. Boost gauge is currently busted, I'll get that fixed up and see what it tells me.

Thanks Hodge, that's a good start.

[mudski]

EGR valve could be jammed due to the corrugations?

[Coldcomfort]

Clean your MAF sensor. Very easy job but often ignored.

[10G]

Now the MAF could be the problem, it was very dusty in sections.

Thanks for the help folks.

[Bidja]

Just to add here, do a quick check of VNT actuator function (vacuum):

at idle, is the actuator rod in the raised position, ensure that the lever is resting against vane limit stop screw? yes/no (should be yes), and

then still at idle, pull the vacuum hose off the actuator rod should drop to bottom of stroke promptly? yes/no (should be yes)


As mentioned _ Check that all boost hoses are fitting securely, check for splits/damage, loose clamps. Check your boost reference take off point, hose and connection for leaks.

[10G]

Just to add here, do a quick check of VNT actuator function (vacuum):

at idle, is the actuator rod in the raised position, ensure that the lever is resting against vane limit stop screw? yes/no (should be yes), and

then still at idle, pull the vacuum hose off the actuator rod should drop to bottom of stroke promptly? yes/no (should be yes)


As mentioned _ Check that all boost hoses are fitting securely, check for splits/damage, loose clamps. Check your boost reference take off point, hose and connection for leaks.

Thanks @Bidja, I'll do all that. Just got out of the truck. She's running about 100 degrees hotter than it should and low on boost I reckon.

[Bidja]

She's running about 100 degrees hotter than it should and low on boost I reckon.

High EGTs, Guess this with eng under high load / hauling?

Important to rule out any vac or boost faults / issues first. Good to get boost gauge working.

What boost control method do u use?

What engine mods?

Let us know how it goes.

[10G]

Got the gauge going, it's only making half boost.

Normally it'll peak at 15psi and sit on 13psi at 100kmh on the flat in 5th, that gives me 300+ EGTs.
Today at 100kmh I was boosting around 5.5 with EGTs at about 500+

I got both a Dawes and Needle valve.

The only thing that I have done that could affect it was that I tightened up the large hose from the IC a while back, that's the only thing I've touched. That could have produced a leak I guess, it's the original hose, maybe it's overtightened?

No engine mods.

I'm going to check/replace all the small vacuum hoses around that area.