To briefly sum up I've been having a engine judder with a spike in RPM at idle when the car reaches water temp 90degC and not a degree less, not even at 89. Inlet Manifold replaced/ EGR replaced/ MAF unplugged/ MAP cleans/ Air duct to turbo tightened/ DPF = Normal clogging & no fault codes. Still no difference. For anybody who is interested in detailed trouble I've been having see this thread...
It has got worse in the heat and the other day I had a scary juddering at 70mph, 2000rpm in 6th gear. This has happened once before after the manifold was replaced but I thought it was a DPF regen.
I've taken some data using ECU scan and an excel spread sheet. I've monitored the injectors and I wondered if any tech'ies can interpret the data....
Below is a graph taken seconds after start up...
This one shows the injectors seconds after I watched the water temp sensor gauge reach 90degC. It was accompanied by juddering, and a repeated increase and decrease in RPM. Injector 4 seems interesting
I have the free version of ECUscan so I can only monitor 4 injectors (parameters) at a time. (plus I forgot to save the other 2 graphs.
However I did take this data at warm:
Injector Cyl. 1: minimum
reading -52mm3/i to max
Cyl. 2: min
-36 to max
Cyl. 3: min
-0.99 to max
Cyl. 4: min
+2.54 to max
Cyl. 5 min
-82 to max
Can anybody interpret what these readings say about the state of my injectors? Particularly Injector 4 which gave a plus 2.5 - 2.7 reading when all the others read between 0 and minus 1.
Would this be causing the symptoms I am experiencing?
Do any need replacing/ reprogramming/ reconditioning?
I would appreciate any views.