Testbook Screen dumps / T4 Options - Page 4

oddsocks · 4th December 2007, 22:29

Quote:

Originally Posted by Keith

I thought you could tweak individual injectors but I was wrong you can't on T4, the engine ECU does all that to maintain smooth running only thing you can change is the tickover in 10rpm steps I have just turned mine up 10 rpm and it now ticking over much more smoothly

some pics

This is the resultant cylinder balancing after knocking the tickover up 10 rpm

Keith - thanks for this _ I put my cdt 03 plate into the local xpart dealer last week for a T4 test as I had stalling and poor hot start. I now know it was due to injector leakback on cylinder 3 and 4 but in hindsight (i determined this, not the xpart mech) it was shown on this display - cyl 1&2 were at 760 rpm, 3 and 4 at 790 - presumably lower pressure due to leak back - less compression, faster cylinder feed. the compensation values were 0 for cylinder 4 and the others well within the /- 15 at about 2.
This RPM variation may be another useful indication of leakback.

I've another post open on the injector service, I'll update when I get them back

steve107 · 31st March 2009, 08:45

will the t4 tell you if the xpart remap upgade has been done

JohnDotCom · 31st March 2009, 17:43

Not that I'm aware of.
It cannot tell any other Mods either or remaps.
So always disconnect or turn off Synergy Units and tell them if you have a Remap on board before any service.
Also leave a note across steering wheel.

Keith · 23rd August 2015, 19:52

Just going over some of my previous T4 postings before I sell my T4
A real shame the hosting site I used for many of the above pics folded

I will see if I have them archived anywhere else and repair this thread if poss.

It has had over 6000 views so still seems to be useful even if some of my speculations at the time was probably wrong

31st March 2009, 08:45	#32
steve107 Loves to post 75 cdt tourer diesel Join Date: Jun 2008 Location: swinton rotherham Posts: 492 Thanks: 0 Thanked 0 Times in 0 Posts	will the t4 tell you if the xpart remap upgade has been done

31st March 2009, 17:43	#33
JohnDotCom * Rover 75 FaceLift Tourer CDTi 170BHP Auto ConnSE 2005 Model Starlight Silver Join Date: Nov 2006 Location: Abergele Posts: 28,735 Thanks: 0 Thanked 6 Times in 5 Posts	Not that I'm aware of. It cannot tell any other Mods either or remaps. So always disconnect or turn off Synergy Units and tell them if you have a Remap on board before any service. Also leave a note across steering wheel.

23rd August 2015, 19:52	#34
Keith This is my second home ZT400 Join Date: Oct 2006 Location: Ellesmere Posts: 5,948 Thanks: 0 Thanked 43 Times in 29 Posts	Just going over some of my previous T4 postings before I sell my T4 A real shame the hosting site I used for many of the above pics folded I will see if I have them archived anywhere else and repair this thread if poss. It has had over 6000 views so still seems to be useful even if some of my speculations at the time was probably wrong