 | Home > Puma (Tdci) > 2.4 no power under load |
 
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| ZeDefender Member Since: 15 Sep 2011 Location: Munich Posts: 4731   
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I suppose you've checked all the other areas such as turbo/intercooler pipes etc.? Are any fault codes showing up? Tell someone you love them today because life is short.
But shout it at them in German because life is also terrifying and confusing... |
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1st Dec 2014 12:54pm |
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| a&t Member Since: 24 Nov 2014 Location: Harare, Zimbabwe Posts: 3 
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Hi, thanks for your interest,
There was an error that came up and it said "No turbo boost pressure" we took it down to a Turbo specialist and he couldn't find anything wrong. To be honest, I always listen for that turbo "whistle" which, on this one seems to be quite faint. We have driven it again and again and pushed it, but that error hasn't come up again. Even if it was the turbo.... at 16000km?? Doesn't the turbo only come in when the fuel pressure is at the right limits? |
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1st Dec 2014 1:12pm |
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| ZeDefender Member Since: 15 Sep 2011 Location: Munich Posts: 4731
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If the hose has a large enough tear in it, either pre- or post-intercooler you might not hear it over the engine. Sorry, I don't know enough about the fuel pressure/turbo relationship. Hopefully other members will have some ideas. If not, it might be worth sending a PM to one of the tuners. Pete Bell is particularly helpful and has some very nice gadgets but keep your question short and specific
 Tell someone you love them today because life is short.
But shout it at them in German because life is also terrifying and confusing... |
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1st Dec 2014 1:30pm |
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| munch90 Member Since: 26 Oct 2013 Location: guildford Posts: 3558 
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turbo actuator rod seized ?
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1st Dec 2014 2:21pm |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 17382  
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Could well be the Volume Control Valve on the fuel pump. Relatively cheap to replace and can cause all sorts of strange symptoms, often without producing any relevant DTCs.
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1st Dec 2014 5:59pm |
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| Mongolia Member Since: 23 Jun 2013 Location: Toulouse Posts: 45 
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I have an issue, It's a power loss which persists (my Defender TD4 is a MY 2007 with 200000 km on the clock). I have trouble pulling the 6th to the max. Before, it reached easily 132 km/h and then regulate electronically. Now, I succeed painfully (after launching 2km on the flat, windless) to reach 130 km/h,
It remains an unsolved issue. Meanwhile, I - Changed my glow plugs - Makes a slagging pushed of the intake pipe - Changed my turbo (a little worn) - Replaced my genuine hoses by silicone hoses - Removed the catalytic converter - Cleaned my intercooler - Removed the EGR valve - Replaced the MAF and MAP sensors - Controlled bench my injectors. OK - Swapped my valve VCV and my injectors (with another Def who had 30000 km on the clock). No result. - Checked 2 times my cylinder compressions (21 bars on all 4 cyl). Always OK Only one result, after scouring the intake pipe and changing the turbo, is a little gain of power. Before, it was maxing 120km/h and now, it hardly gets to reach 130 km/h. And of course, no light, no DTCs with the diagnosis suitcase. What is left for me to explore: fuel circuit? ECU? common-rail? reprogramming? .... and what would be the first? Thank you for your help |
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6th Dec 2014 8:52am |
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| Lorryman100 Member Since: 01 Oct 2010 Location: Here Posts: 2686 |
Those are really low readings. At full power ie, pedal to the floor at 3000 rpm I would expect about 145000 kPa of pressure at the common rail. Before replacing the fuel pump I would check a few other parameters first purely to discount them as the cause of the issue. What boost and fuel pressure are you getting at 3000rpm with the pedal to the floor in 3rd gear? Is there any rattling coming from the engine bay when under load? Remove the pressure limiting valve from the fuel rail and give it a shake. If it rattles the pressure limiting valve has activated (basically a ball bearing is crimped into place and is designed to pop out at a set pressure saving the HP fuelling side from damage) and needs replacing and will give the symptoms you describe in the original post.  Click image to enlarge When you cleaned out the fuel tank and blew the fuel feed lines did you disconnect the feeds at the fuel filter, the ports into the filter housing are very small and need the fuel lines disconnected to ensure they are clear of debris. Check the loom from the PCM to the fuel pump and Turbo modulator. In early model Pumas up to 2010 the turbo modulator harness was stretched due to engine vibration and routing. A tech bulletin was issued with an extension for the modulator loom. No 1 in the below diagram is the loom that contains the modulators wiring and the circled plug is what goes into the modulator. Click image to enlarge Click image to enlarge Click image to enlarge Click image to enlarge Click image to enlarge Remove the MAP sensor and check for gunge covering the sensor head. This sensor is used by the PCM for boost and if it is gunged up can give erroneous readings to the PCM. Click image to enlarge The below video is a live data read on my Puma and will show you pressure readings at different RPM loads etc. Let us know how you get on. HTH Brian. Admin note: this post has had its images recovered from a money grabbing photo hosting site and reinstated  |
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6th Dec 2014 11:16am |
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| a&t Member Since: 24 Nov 2014 Location: Harare, Zimbabwe Posts: 3
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Hi all,
Apologies for the overdue update. Many thanks for your valuable input, your advice was greatly appreciated. We found a split in one of the intercooler hoses which wasn't noticed while the hose was in position, but only when we resorted to removing all the hoses to do a thorough inspection. The split was hiding behind the braided sleeving on the hose on the passenger side of the vehicle. See pic attached. The hose wasn't available locally (Zimbabwe) and would need to be brought up from South Africa. So to be sure there wasn't anything else causing the problem, we cut the split section out the hose and fabricated a steel pipe to suite the profile of the bit that was cut out, connected the rubber hoses on either end and then took it for a spin...... a different vehicle!!! Power levels had returned and the familiar turbo sound was back! We ordered hoses for both sides and all is well. I think what threw us off was when the client reported that he had put in dirty fuel, so we were concentrating on that side of things. What a learning curve! We found it odd that such a long hose is made of rubber. A short while later, another client contacted us reporting the same symptoms. We directed him straight to that hose and his was also split. Sounds like it could be a common problem?? Grateful thanks to Lorryman 100 for your input and live feed info. Click image to enlarge |
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2nd Mar 2015 10:52am |
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