Hi guys

Just a quick one. Have 2007 1.9 GP and noticed I’m not getting the acceleration I used to. Normally at about 2500 rpm you’d feel the boost come in and pull almost to 4000 rpm. But for a week now I haven’t noticed that kick and it struggles on the freeway. I tried the test from elearn, by flooring it in 3rd gear at 2500 rpm, but the engine didn’t really pull and wouldn’t go past about 3100 rpm ON FULL ACCELERATION (it does go past this on normal gentle acceleration but with little or no power.

Lastly had the engine running while I was cleaning the engine bay and saw air bubbles coming from the turbine housing, where the core and housing join, could this leak be causing the problem. Also no faults on dash.

Hi. My jtd had similar.

MES diagnosis seemed to indicate the boost solenoid was not operational.

Are you telling you sprayed (cold) water on the (hot) turbine ? Not the most clever thing I've red today... can you imagine the thermal stress you put on the piece of precision that the turbo is ?

Probably the wastegate is kept (partly) open, try to make it move manually (engine stopped), if not seized the problem comes either from the actuator or from its control valve (or cracked piping).

@ Charlie: did You solved your issue ??

BRs, Bernie

If someone here helped You fix -or better, understand- your issue, hit the thanks icon @ bottom right corner, it's free and makes us feel helpy ;-)

My car is at the end of its life.. so just left it.

Strangely it boosts on some days and not others..

" Strangely it boosts on some days and not others.. "

Without ECU complaining ?

StormN said:

Hi guys

Just a quick one. Have 2007 1.9 GP and noticed I’m not getting the acceleration I used to. Normally at about 2500 rpm you’d feel the boost come in and pull almost to 4000 rpm. But for a week now I haven’t noticed that kick and it struggles on the freeway. I tried the test from elearn, by flooring it in 3rd gear at 2500 rpm, but the engine didn’t really pull and wouldn’t go past about 3100 rpm ON FULL ACCELERATION (it does go past this on normal gentle acceleration but with little or no power.

Lastly had the engine running while I was cleaning the engine bay and saw air bubbles coming from the turbine housing, where the core and housing join, could this leak be causing the problem. Also no faults on dash.

Click to expand...

I can't comment about the bubble parts but I had the same acceleration problem as you I got the engine terracleaned cost £110 and it was like new the throttle response the power everything felt like a brand new engine

StormN said:

Hi guys
... saw air bubbles coming from the turbine housing, where the core and housing join, could this leak be causing the problem. Also no faults on dash.

Click to expand...

A turbo blows great amounts of air... what you are describing will not affect it.
More probably something like stuck vanes (if it has variable geometry turbo -
VGT) or split hoses leading to/from boost solenoid (this one controls either the wastegate either the VGT).

There can be other causes like internal damage to turbo/housing (melted turbine wheel or a crack in the housing) that will stop it from making decent boost.

Been struggling to get connected. also not tech savvy so still struggling with MES. other softwares connecting to the ecu and there are no faults.

Havent checked the actuator as yet, will try over the next few days, as well as go through a thorough check on all the piping. thanks

Thanks will definitely have a look at the piping, seems more plausible. It was a colder than usual day today, raining for the most part and she felt more responsive almost as if she was holding her boost better. Nowhere near normal but noticeably better.

Bernievarian said:

" Strangely it boosts on some days and not others.. "

Without ECU complaining ?

Click to expand...

1 light in 3 years..

StormN said:

Been struggling to get connected. also not tech savvy so still struggling with MES. other softwares connecting to the ecu and there are no faults.

Click to expand...

connect to cars OBD port

ENGINE

look for ACTUATORS tab,

then you can listen as it will switch predetermined actuators ON and OFF,
the boost solenoid was the only thing I could NOT gear switching.

varesecrazy said:

connect to cars OBD port

ENGINE

look for ACTUATORS tab,

then you can listen as it will switch predetermined actuators ON and OFF,
the boost solenoid was the only thing I could NOT hear switching.

Click to expand...

That will help but won't be enough.
I have a boost solenoid that was OK electrically, and it would click but the valve would not open.
I only figured that out blowing through one of the nipples while using a 9v battery and some pieces of wire to actuate the solenoid.

Hey guys just an update, so this is what I’ve done:

Took her out for a drive and looked at the intake manifold pressures in each gear: 1st - 160KPa, 2nd - 155KPa, 3rd - 144KPa, 4th - 132KPa (these were the highest readings between 2500-3500rpm. Only in first and second did I reach 3500rpm) this is strange because boost should be gear dependent,right?

Then I took the vacuum/boost solenoid out and tested it by blowing through one end. I could do this easily. Then I added 12V to the solenoid while blowing and still I blew freely. Does this confirm that the solenoid is out?

did you use MES?

There is a graph feature...that is the most useful thing about it.
You first select the parameters then go to Graph, hit Start and start recording the parameters.

In this case, you should select parameters like:
-Requested boost pressure (kpa/milibar)
-Manifold pressure (kpa/milibar)
-Throttle position (%)
-RPM
-boost solenoid/valve (%)


Does the solenoid make any noise when applying voltage to it?..it does sound like it might be at fault.

Now some more troubleshooting you could do is to clamp the lines going to the solenoid...
Take the car for a drive.. check how it feel, if there is more boost. Read the pressure graphs..etc.

If it's much better then replace the sensor ASAP.. don't drive it like that, without boost control, you will get overboost errors, and various problems like full power + no power.

No I used EasyOBDII cause it was the only other free software I could find, very limited in its features tho. couldn’t connect to my ecu with MES.

I’ll clamp the lines to the solenoid and see what happens. Thanks again.

The 1.9mjt has got a Variable Geometry Turbo, which vanes are moved by a vacuum actuator controled by a single way proportionnal valve driven by the Engine Control Unit.

As this is a diesel engine, the vacuum is created by a little pump and stored in a vacuum reservoir. If the piping is broken, there is no vacuum that can be applied to the actuator and the VGT will stay in "full boost" position, which will result in the ECU switching the engine in limp mode. Same result if the menbrane in the actuator is broken or leaking, same if the control valve stays open (as it seems). The command rod or the rotary plate in the turbo might aswell be bent/seized...
BRs, Bernie

If someone here helped You fix -or better, understand- your issue, hit the thanks icon @ bottom right corner, it's free and makes us feel helpy ;-)

Hey guys replaced the vacuum/boost solenoid, everything’s back to normal! As always thank you for the help.

Good to have some backup, as always. Thanks for that !!

Bernievarian said:

The 1.9mjt has got a Variable Geometry Turbo, which vanes are moved by a vacuum actuator controled by a single way proportionnal valve driven by the Engine Control Unit.

As this is a diesel engine, the vacuum is created by a little pump and stored in a vacuum reservoir. If the piping is broken, there is no vacuum that can be applied to the actuator and the VGT will stay in "full boost" position, which will result in the ECU switching the engine in limp mode. Same result if the menbrane in the actuator is broken or leaking, same if the control valve stays open (as it seems). The command rod or the rotary plate in the turbo might aswell be bent/seized...
BRs, Bernie

If someone here helped You fix -or better, understand- your issue, hit the thanks icon @ bottom right corner, it's free and makes us feel helpy ;-)

Click to expand...

Hi Bernie one last thing, the intake manifold reading i got, were those absolute pressure reading or boost pressure from the turbo?