JTS Injectors DONE
For the last 3 or 4 months I've been having problems with my 156 JTS, rough idling and bad flat spots when accelerating and constant MCSF light on the dash board.
The fault codes P0100, P0101 & P0172, all relating to misfire issues.
I cleaned the spark plugs, MAF, swapped around the coil packs but to no avail, everything still pointed to cylinder No 1 misfire. So reluctantly I got my trusty "indy", Phil @ Alfa Craft to remove the injectors. I'd made arrangements and took the injectors to Richard @ ASNU the specialist in ultra-sonic injector cleaning. Richards initial comments were, they were some of the dirtiest injectors he'd seen and the white seal on the injector spout showed signs of engine over heating. The injectors were put on the Spray Pattern test rig, fault found immediately, injector No 4 did not spray, merely dribbled. The second test was through flow, the perfect score was 100. Inj' 1 =96, 2=85, 3=90 & 4=35, injector 4 failed. I have attempted to upload some pictures,
Pic' 1 showing dirty injectors
Pic' 2 showing spray pattern test, not a great photo but Inj' 4 is clearly not spraying.
Pic' 3 showing flow through volumes, cylinder 4 clearly has limited flow through.
All injectors were ultra sonically cleaned, the flow through rates on injectors 1 to 3 improved, injector 4 remained the same.
What caused injector 4 to fail, no one can be 100% certain, I would agree with engine over heating from a previous owner.
A NEW injector found it's way to cylinder 4 and everything put back to how it was before.
Richard advised to run the engine at idle for 15 mins to let to ECU start to relearn or remap
itself and then to proceed with some vigorous driving.
I've had the car back for 5 days and its driving like a dream, I'm still working on the remapping exercise , lots of long acceleration unto 5000 revs and up hill climbing, its fun.
So are injectors the bane of the JTS, probably, but only the fact that are awkward remove when they need cleaning. I am informed by the experts that injectors rarely fail they just need a little TLC from time to time.