More overboosting......................

[mattie182]

Again from the start....

2.5, diesel, 3" exhaust, chip - On long hills or when towing I get a fault code and limp mode, stop car, restart and drive.
I loose cruise and light stays on.
I have read that the light should go out in a day or so - mine doesnt??????

How do I stop this happening?????????????????????? Was very dangerous last time, overtaking and all. But I dont want to loose my power

Any suggestions............ PLEASE



Matt

[Tim007]

By an ultra gauge. They are about $70 ordered online from the states. I had the same problem and when I got my gauge I was able to see what the code was which helped the mechanic tune the problem out and second the ultra gauge allows you to reset the engine light on the move which saved me a heap of times as you won't have to stop the car. Also you may have more then one code being thrown which is why some times the limp mode resets and why it doesn't on others. I ended up having mine dyno tuned to work all the bugs out. Best $300 bucks I ever spent on my rig.

[Custom Offroad]

Perhaps you could provide a little more info. What chip are you running? Have you increased the boost? Do you have a fuel rail limiter? How do you know it is a overboost issue without a scan guage or ultra guage? I don't believe the exhaust will have anything to do with the problem.

People with more knowledge then me will be along to add to what i have to say but more then likely you have a overfuel issue due to the intercepter chip increasing the amount of fuel being delivered to the engine hence why chipit have developed the fuel rail limiter mod. I had similar issues with a DPchip and I changed over to the ecutek tune and have never looked back.

I suggest you contact the supplier of the chip and explain the issues you are having and perhaps they can modify the tune to suit your car.

Mitch

[gregned]

Ultra gauge won't clear overboost, light should go out after 3 days ( mine did). pm Tony for tuning tips, are you running with the map mod?

[Tony]

Hi Matt, I have actually come across a few MN's doing this and some are not chipped either. infact there is even an MRT tuned MN doing this....
Chipit them selves, buy luck have never come across it as yet. Even with hours of dyno time.

It could be P1298 = VGT system overpressure. (Mitsu specific code so the generic scan tools often cant read it with out the correct firmware) The check light will go away after a few days, trust me.

I believe the condition is combustion temp and barometric related, the 3" free flow exhaust also can contribute to the issue in some cases as can allow the turbo to overspeed whilst the VGT is in attack position.

For a start drop way back in tunes and get that fuel out of the equation. Id recommend no higher than tune 4 if your running the chip it.
If your running chip it, I can send you a more conservative tune to make it safer untill the issue gets sorted out. It may also be worth dropping the EGR blank out (if you have one) first for a few days and see if it settles down. I think the blank plate could be increasing the combustion temps slightly and also spooling the turbo harder under full load.

Remotely custom tuning around this issue is a very fine line as if we cap the MAP signal it will infact increase the boost more with fuel added.

I'm doing some work with an MN over my way with the same issue. Taking screen shots of sensor out puts and also data logging the runs. At this point there is no real consistent boost pattern causing the code. Other than duty of the boost values over a given time. EGTs and intake temps have not contributed to the pattern.

MMAL have actually purchased a triton back from a customer as they literally couldn't sort the issue in stock form. It had over 70k on it.

When I have some more answers I'll be updating all of you dont worry.

I also seem to recall putting a strong warning in an exhaust GB IOI thread on this issue too.

As mentioned in a previous post, if issues like this ever should arise and you have a performance enhancement of some description. You will get normally get the best results by contacting their support network.
T

[hvac guy]

Hey Tony have U tried simulating an overboost code
IE using pressurised air though a regulator to the map sensor
To see what psi triggers code and or duration of overboost
And to check calabration of map sensor via scan guage or mv output

Just thinking out loud

How about a pressure relief valve on the map line.

[Tony]

Hey Tony have U tried simulating an overboost code
IE using pressurised air though a regulator to the map sensor
To see what psi triggers code and or duration of overboost
And to check calabration of map sensor via scan guage or mv output

Just thinking out loud

How about a pressure relief valve on the map line.

Yea, have pretty much done the above with both OBE2 data logging and stand alone analogue boost sensors logging data.

I have also trialled a bleed on the map line and found it only causes the VGT to remain in the attack position for longer although does have the effect of trimming the actual boost the MAP sensor gets.

Good to toss some thoughts around as this issue may creep up over time.

[srb]

What about some sort of bleed valve or BOV for those having over boosting issues? I know it's not really a diesel thing and please slap me down if I'm talking crap.

I've been looking at the EGR system on my mates Hilux and have found it to be quite different to the Tritons set up. It actually has a bypass through the EGR cooler to dump excess boost pressure from the manifold. And I can't work out the why? Anyway that's off topic but just though it was interesting.

[mattie182]

Morning All,

Thanks for the replys, I have some more info, I should have included in the first post

The boost was wound up, BUT i have wound it back.
The chip is a Tunit, but was throwing the fault before the chip went on
Yes, P1298 is the fault code - A local mechanic has told me its an overboost.....
My light has stayed on for over a week - before I took it in to get reset with a program


Thansk again

Matt

[TUFF TROOP]

There is a mitsy ecu update for this issue. I will know in 4 hours time when I finish putting this mn back together and I'll check it for you. But they have change the parameters in the ecu to stop the over boost and vgt codes

[Diablo]

I'm sure you may have already checked this but have you made sure there are no leaks between the turbo and bleed valve? (not being familiar with the mn electronic waste gate I'm assuming you have a line between the turbo and a pressure sensor that the bleed valve is mounted on)

I only ask this as it was the cause of my over boosting on my ML

[mattie182]

There is a mitsy ecu update for this issue. I will know in 4 hours time when I finish putting this mn back together and I'll check it for you. But they have change the parameters in the ecu to stop the over boost and vgt codes

Morning tuff troop -
Do you have any more info regarding this yet??

What are thoughts on a BOV? Could it work?

[TUFF TROOP]

Sorry guys here's a pic . Have also Inboxed it to tony. It has fixed our customers cars with the same issues..

[mattie182]

Sorry for my ignorance but,

This is soemthing my local Mitsi dealer can do for me?
It is an update or recall??
Should hopefully fix my engine light coming on, and limp mode (please



Thanks again'


matt

[TUFF TROOP]

Yeah dealer mate! Just a update

[Tim007]

Ultra gauge won't clear overboost, light should go out after 3 days ( mine did). pm Tony for tuning tips, are you running with the map mod?

Sorry Greg, I have to disagree. The Ultra Gauge will clear and has several times on my truck P0234 which is the overboost code. It is a great bit of gear.

[gregned]

Hi Tim
Might have to get one then....I was told by a reliable source that it wouldn't clear it.

[Tim007]

Hi Tim
Might have to get one then....I was told by a reliable source that it wouldn't clear it.

The only reason I was sure to mention it was I took my Chip off yesterday but did not adjust the bleed T piece (just forgot as the chip is going straight back on) I hit 22PSI on the way home. Threw an engine light and went into limp. I checked the code and it was P0234 "over boost" and cleared it while I was still driving. Truck came out of limp and operated normal.

[Tony]

P0234 (overboost and P1298 VGT system overpressure are very different codes far as a generic reader goes. They will not see P1298 with out the correct firmware.

[gregned]

Hmmmm I see said the blind man!

[Mattstruck]

Is this the same ECU update that everyone has been complaining about TT? The one killing power?

Ive had the same issue and cleared it with a scan gauge but its very dangerous at 100km passing on a hill

[TUFF TROOP]

Nope no loss of power etc . If I was unfortunate enough to have a mn i would have it done already hahaha

[CHIP IT]

From what I understand, this particular patch actually has more to do with how the ECU sets the points which it log the codes.

Should have zip effect on the actual fuelling or boost behaviour hopefully.

[mattie182]

Spoke to my local Mitsu dealer yesterday who told me there is no such thing available!!

Argghhhhhhhhh

What should I be telling them.


Matt

[Tony]

Funny you say that, I got the same answer. It seems the dealers have a fair bit in common with theses Tritons.

Not all created equal.