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Over boost and why?????


Bogmeister
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My 2003 3lt has suddenly started going into limp mode, mainly in 3rd gear, and lighting the engine light. We put it on a mates scan tool and got the error code 0095 (over boost) I have Dawes and needle valve, EGR block.Boost hits about 7psi and it limps. Sometimes I can get to 16 psi, but not often. I also have a strange squeaking noise when I shut it down sometimes. It sounds like a vacuum leak. Would that set off a limp mode? How do you find a leak on a diesel? On the way back from Brisbane last weekend, it limped home from Kilcoy (160km). At one stage I hit a bump and it seemed to take off for a while but soon limped again. This makes me wonder if I have a faulty sender or wire somewhere. Has any body had a similar thing happen?

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first things that come to mind..

The hiss sounds like a boost leak. Start the engine and listen for leaks from all the pipes around the inter cooler. Something might have come off, or a hose clamp come loose. There has been reports of hoses getting worn through (especially if the plastic cover has been put back on the engine and not modified)

If you can't find any hoses leaking, again with the engine running, spray some soapy water on your intercooler and check for leaks.

I'd start there, it defibately sounds like something is leaking.. you mention you have nads, check all those pipes too.

Sent from my Galaxy Nexus using Tapatalk 2

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Ohh yeah, don't be afraid to do the "wiggle test" with the pipes, it might assist finding the leak...

I'd be interesting to hearing your findings, if its the intercooler its a good excuse for an upgrade to ase or CC.

Sent from my Galaxy Nexus using Tapatalk 2

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Over boost does not bring engine light on. Clean the maf and see how it goes

I had a bad belt that made a squeky noise like that on shutdown. Engine light may be due to water in fuel filter if no other codes are present when checking. Try filter.

One other thing is it may be the turbo actuator as it may be leaking giving you the noise and not bring boost on. I don't think your hitting limp at 7psi

Dan

Edited by cairnsGU
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first things that come to mind..

The hiss sounds like a boost leak. The hiss only happens when I shut it down and sounds like its coming from the clutch/brake booster area. There should be bugger all boost at shut down

If you can't find any hoses leaking, again with the engine running, spray some soapy water on your intercooler and check for leaks. The I/C was replaced but will check all the hoses etc.

Over boost does not bring engine light on. Clean the maf and see how it goes

I had a bad belt that made a squeky noise like that on shutdown. Engine light may be due to water in fuel filter if no other codes are present when checking. Try filter. The hiss only happens when I shut it down and sounds like its coming from the clutch/brake booster area. I will clean the MAF again when I come home (working away for a couple of days)

One other thing is it may be the turbo actuator as it may be leaking giving you the noise and not bring boost on. I will look at this too.

I don't think your hitting limp at 7psi. I wish I could show you. lol

Dan

I will clean the MAF and check its voltages. Thanks guys . Any more ideas are more than welcome

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Over boost does not bring engine light on. Clean the maf and see how it goes

I had a bad belt that made a squeky noise like that on shutdown. Engine light may be due to water in fuel filter if no other codes are present when checking. Try filter.

One other thing is it may be the turbo actuator as it may be leaking giving you the noise and not bring boost on. I don't think your hitting limp at 7psi

Dan

All good points but remember that if the hose to the boost gauge is leaking (he has a Dawes valve fitted so its teed into that) the boost gauge will not be reading accutately, he might be getting a lot more than 7psi, causing limp mode..

Sent from my GT-P7100 using Tapatalk 2

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My 2003 3lt has suddenly started going into limp mode, mainly in 3rd gear, and lighting the engine light. We put it on a mates scan tool and got the error code 0095 (over boost) I have Dawes and needle valve, EGR block.Boost hits about 7psi and it limps. Sometimes I can get to 16 psi, but not often. I also have a strange squeaking noise when I shut it down sometimes. It sounds like a vacuum leak. Would that set off a limp mode? How do you find a leak on a diesel? On the way back from Brisbane last weekend, it limped home from Kilcoy (160km). At one stage I hit a bump and it seemed to take off for a while but soon limped again. This makes me wonder if I have a faulty sender or wire somewhere. Has any body had a similar thing happen?

Whatever it is, it's intermittant, hitting a bump and having it perform better for a while doesn't add up. The 7psi sometimes and 16 on other occasions is also very strange. And I can think of no reason why limp would occur at 7psi. Limp occurs for MAF voltage reasons and overboost at the MAP.

If the IC was leaking that bad it would be consitant even a small leak would have consistancy. A loose IC hose would blow off, It is really sounding a lot like a loss of vacuum effecting boost, or a leak somewhere in the line to the boost gauge.

It doesn't really sound like a dirty MAF but that is always a good place to start in the elimination process.

I too will be interested in the results and outcome.

Edited by geeyoutoo
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geeyoutoo

It is really sounding a lot like a loss of vacuum effecting boost, or a leak somewhere in the line to the boost gauge.

That was my train of thought. I am looking forward to pulling stuff apart and finding it. I might even pull the inlet manifold and t/body off for a good clean

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All good points but remember that if the hose to the boost gauge is leaking (he has a Dawes valve fitted so its teed into that) the boost gauge will not be reading accutately, he might be getting a lot more than 7psi, causing limp mode..

Sent from my GT-P7100 using Tapatalk 2

Good point

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Pulled the plastic engine cover off and found the boost sensor in the I/C unplugged. Since I cant buy vacume hose to replace the clear plastic crap that came with the gauge, in Oakey on a Saturday arvo, I have plugged the sensor back in and disconnected the battery for a while to see if it will reset something and stop the engine light coming on.I will clean the maf while I wait. The boost gauge hose is blowing off at 15psi and interestingly, the engine light is coming on at about 1500 rpm on its way back down after accelerating in third gear (even if the hose stays on). I rev the motor to about 3000 rmp in third, lift my foot to change to fourth and as the tach drops (gets to about 1500), the light comes on..........Go figure

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I replaced the 6000km old oil and air filters and the problem is solved. It runs like a dream again. Maybe it was some dirty fuel or a dodgy filter. I still don't know what the squeak is but am not too bothered. Thanks for the guess cairnsGU, and for all of the other ideas guys

Edited by Bogmeister
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  • 8 months later...

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