Thanks guys, that was really helpful
Yeh, I couldn't understand why an injector with excessive leakback would cause bad starting on cold mornings when its fine any other time (and fine once started) but I'm seriously running out of ideas!
Fortunately it hasn't got bad *yet*, but then it hasn't been any lower than 3c yet. It had a slight hiccup starting the other morning when it was cold and it just brought back memories of the nightmare I had last winter with cold starts... I was never sure I completely solved it as the weather started to warm up anyway so the improvement could have just coincided with that. I may be just paranoid
But so far, I've had;
- New Bosch Battery (can't remember the capacity/CCA but its more than sufficient)
- New NGK glowplugs which have been tested to ensure they are actually heating during preheat
- New crankshaft sensor
- Swapped out MAF/intake temp sensor (also tried disconnected)
- Blanked EGR valve
- Service with new oil, oil filter, fuel filter and air filter
- Clear braided fuel hose on return pipe with a one-way valve to see if air was getting in to the fuel system backwards overnight
And just this week new MAP and coolant temp sensors (although the old ones gave back plausible readings anyway.)
Anyway, back to the original leakback thing... injector 2 is leaking back almost twice as much as the others, but they were all faster than I'd expected (although its the first time I'd done one so I had no experience to judge against.) Didn't measure it since as soon as the engine fired up, my containers fell over
but I could tell by the rate it moved up the pipe, injector 2 was leaking back much quicker.
