johnhorgan
Member Since: 23 Sep 2019
Location: Richmond
Posts: 118
  
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As expected.
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 23rd Sep 2022 7:29 pm |
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Flatlander
Member Since: 20 Jul 2015
Location: Here
Posts: 575
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I still keep coming back in my mind to a boost leak, maybe a soap spray on the inlet manifolds on a cold engine then start it up with a couple of sharp pull-aways from a standing start without warming up the engine (and drying out the soap spray) will confirm or deny the remainder of the charge air path beyond what you've already tested?
Although it should throw a different DTC, is the seal on the intake duct at the side of the cooling pack, by the engine cooling fan connector seated OK? The DTC you state is normally associated with the charge air side but could be caused by an inlet / boost correlation failure.
I know it's getting a bit 'if & maybe', I'm usually more hands-on and when I used to be involved in such things, remote support was with access to a defined set of diagnostic tools.
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| 23rd Sep 2022 7:43 pm |
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johnhorgan
Member Since: 23 Sep 2019
Location: Richmond
Posts: 118
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I will report back once I have some answers.
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| 23rd Sep 2022 7:47 pm |
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johnhorgan
Member Since: 23 Sep 2019
Location: Richmond
Posts: 118
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I am getting 20psi boost at a constant 40mph, going up to 39psi at max load and throttle.
Does this sound about correct ?
As I said it drives as I would expect.
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| 27th Sep 2022 11:58 pm |
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johnhorgan
Member Since: 23 Sep 2019
Location: Richmond
Posts: 118
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20psi sounds a lot, but you have to subtract 14.7 for atmospheric pressure.
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| 28th Sep 2022 12:00 am |
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Flatlander
Member Since: 20 Jul 2015
Location: Here
Posts: 575
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You don't have to subtract anything, I did have to convert to kPa for the numbers to make sense in my head though!
Those figures are fine at 40mph, the WOT reading looks a little bit high, I assume it's transient? if it's held there, It may be an issue with the actuator.
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| 28th Sep 2022 6:39 am |
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johnhorgan
Member Since: 23 Sep 2019
Location: Richmond
Posts: 118
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Yes very transient, it was climbing very quickly, before falling quickly.
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| 28th Sep 2022 6:54 pm |
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johnhorgan
Member Since: 23 Sep 2019
Location: Richmond
Posts: 118
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Here is a post of the pdf from the iid tool graph showing turbo boost etc.
https://www.disco3.co.uk/gallery/albums/us...hImage.pdf
Last edited by johnhorgan on 28th Sep 2022 8:30 pm. Edited 2 times in total
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| 28th Sep 2022 7:13 pm |
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Flatlander
Member Since: 20 Jul 2015
Location: Here
Posts: 575
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Well that's normal behaviour then, the only other thing I can suggest is to remove the sensor and use something like a MityVac to pressurise it to a known value and check the reading on live values, do this for several different pressures to confirm it's not throwing a wobbly at some point.
That leaves the actuator... it's probably moving OK but the position sensor output could be offset / erratic, again, difficult to diagnose remotely so at this stage, I'm just stating what's left to check...
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| 28th Sep 2022 7:17 pm |
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johnhorgan
Member Since: 23 Sep 2019
Location: Richmond
Posts: 118
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I forgot to mention, I have swopped the maf and map sensors with known good replacements (I presume you were referring to the map sensor for vacuum testing).
I dont think it can be turbo body related as this is the second working turbo to give the same fault code.
I am going to have to check the manifolds, although I have cleaned them before recently refitting them.
Any other suggestions ?
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| 28th Sep 2022 7:28 pm |
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johnhorgan
Member Since: 23 Sep 2019
Location: Richmond
Posts: 118
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Do you think adjusting the actuator rod length could help ?
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| 28th Sep 2022 7:29 pm |
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Flatlander
Member Since: 20 Jul 2015
Location: Here
Posts: 575
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Just looked at the graphs, the labels are not the ones I'm used to seeing but the signal / pressure correlation at 129.5 & 168.0 seems off to me, there is a signal / boost lag, which is normal but there are some downward 'spikes' that don't match the changes in boost - even delayed.
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| 28th Sep 2022 7:29 pm |
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Flatlander
Member Since: 20 Jul 2015
Location: Here
Posts: 575
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Yes mate, MAP for pressure testing, but if you've substituted them, then don't bother with that!
What is the first value on the graph, the one that's flat and marked N/A? should there be any data on it?
I wouldn't bother adjusting the rod length unless you think the actuator isn't reaching it's extents - if you do, make some indelible marks and measure between them so you can restore the length exactly should you need to.
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| 28th Sep 2022 7:36 pm |
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johnhorgan
Member Since: 23 Sep 2019
Location: Richmond
Posts: 118
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The first line marked N/A is boost pressure actuator, I added it thinking it would be useful, but its showing nothing.
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| 28th Sep 2022 8:34 pm |
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johnhorgan
Member Since: 23 Sep 2019
Location: Richmond
Posts: 118
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I think the boost stays high as the vehicle changes gear maybe.
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| 28th Sep 2022 8:36 pm |
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