There are maybe half a dozen diesel Xantias here; the screenshot below is of a Series 1 turbo diesel, with Bosch pump. Engine had been idling for a few minutes on a cooler day. I think the car was a private import.
To my mind, the car is noisy, and possibly running rich (the exhaust smells a bit "sweeter" than many diesels). It's just had a pump rebuild, motor in/out, turbo overhaul and head service. I can't vouch for the quality of any of these tasks, as they were performed by people I don't deal with.
However, as mentioned, besides the noise it takes a bit of churning to start, runs on and seems somewhat sluggish.
Can anyone offer comments on the screenshot (other than "a bit fuzzy")?
Thanks, Adam.
Quessies from a Diesel Dummy
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- DickieG
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Pedal voltage changes in line with pedal movement, or should do!addo wrote:Should the pedal voltage change with gentle depressing of the accelerator, or only with increased load?
IIRC as the engine is accelerated the two advance figure should show roughly parallel figures.
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It's not uncommon for a cold TD to be a bit smokey though they usually clear up as the engines gets up to temp. Although mine idles slightly higher than yours is showing, the fuel output was fluctuating (due to thick veg oil) between 2.7 and 4.7mg so that's probably ok.
IME, the called-for and actual advance timing rarely match as one is always chasing the other but they should be close, allowing for computer lag. ~8 degrees matches mine under those conditions. Lift sensor and egr looks normal also.
The pedal sensor should follow pedal movement. Mine shows 0.5v (idle) to about 4/5volts (WOT) but it's sensitive to fitment and can be "tuned" slightly.
Does the smoke clear once the temp is 80 and above?
IME, the called-for and actual advance timing rarely match as one is always chasing the other but they should be close, allowing for computer lag. ~8 degrees matches mine under those conditions. Lift sensor and egr looks normal also.
The pedal sensor should follow pedal movement. Mine shows 0.5v (idle) to about 4/5volts (WOT) but it's sensitive to fitment and can be "tuned" slightly.
Does the smoke clear once the temp is 80 and above?
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Yes, but I wouldn't recommend adjusting it for the symptoms you describe (not registering pedal position). Instead, I would undo the two bolts securing the whole pot assembly to the pump body and lift it clear. You will see the accelerator shaft is fitted with a two-pronged fitting that locates into the pot underside. It's possible they were misaligned in the slots rather than the holes.addo wrote:How is the throttle pot adjusted? Is it the one atop the Bosch pump?
I've not described it very well but it should all become clear when you lift it off.
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There is a specific setting that the throttle pot should be set to for when the accelerator is in the idle position. I'll have a look at the diagnostic manual and let you know the specific figure when I'm next home.
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Sorry, not exactly on topic here, but I don't understand anything to do with the later bosch pumped Xantia, what exactly do all the extra gubbins do?
My earlier Xantia doesn't have most of that stuff however it does have one microswitch that changes over from on/off at about half throttle, I can't tell what it does? I thought it might affect the running of the AC as the AC does turn off when you pull off, but it doesn't seem to be the cause.
Again sorry about the off topic post, just intriegued is all!
My earlier Xantia doesn't have most of that stuff however it does have one microswitch that changes over from on/off at about half throttle, I can't tell what it does? I thought it might affect the running of the AC as the AC does turn off when you pull off, but it doesn't seem to be the cause.
Again sorry about the off topic post, just intriegued is all!
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I believe the additional gubbins are there to give more accurate fuelling/lower emissions, not too sure off the top of my head about the switch on yours but it might well be to turn off the glowplugs post start heating when full throttle is used.
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The throttle potentiometer sends a voltage to the ECU which represents throttle position. Engine speed is another signal back to the ECU. There's a solenoid actuator at the bottom of the Bosch pump which controls pump timing advance.
The timing angle is adjusted by the ECU depending on engine load.
I had a battle with this system on my old Xantia 1.9 turboD
The timing angle is adjusted by the ECU depending on engine load.
I had a battle with this system on my old Xantia 1.9 turboD
Cheers, Kev
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Used to have:- Xantia 1.9 TurboD SX. 1996 Blue & 1998 Silver Activa. + 1992 BX TZD Turbo.
02 plate C5 2.2 Hdi Exclusive SE (now 170k miles 03/21).
Used to have:- Xantia 1.9 TurboD SX. 1996 Blue & 1998 Silver Activa. + 1992 BX TZD Turbo.