clark_rally wrote:Evening folk, please be gentle as I really don't have much experience, but been looking at a Seat Leon that if left sitting for 10mins plus, has an extended crank to get the thing to start. If left overnight it takes a lot of winding over to get to fire. Engine code is BMN (2.0 PD TDi). 60,000 miles. 2007model. Its a new engine fitted due to a crack in block caused by a failed rocker on an inlet valve. Poor start was there before but mechanic assumed it was just due to the broken parts, however it is same with new (remanufactured) engine. All ancillaries were swapped over from old engine to new, it has non functioning swirl flaps (customer wouldnt fit a replacement). Injectors etc were all swapped over (new seals and adjusters fitted). Timing has been checked twice now with pins locking crank and cams. I have scoped the crank/cam but no idea if things line up like they should, cant find a good waveform to compare, but as pins are all good, am assuming it must be ok. I then thought I might aswell have a play with amp clamp and look at the injectors. Cyl 1-3 all produced an identical waveform, but number 4 is low on peak opening current and very low on closing current. There are millions of tiny air bubbles present in the fuel return line @ filter. Supply after filter is 100% air free and gd pressure. Dont have a suitable adaptor to check intermediate pump pressure tho. Once started car idles with a small lumpyness, but goes like a train out on the road. If anyone has any ideas it'd be much appreciated, but my thought are inj 4 needs looking at?
Thanks for the reply, the PD injector preset was what I used to setup the scope and the waveform is identical to that I obtained for cyl 1-3 as far as I can tell. Just not really sure if the waveform for cyl 4 would be enough to cause the poor start or not.
I managed to get an adaptor this morning to test the pressure at the intermediate pump, and once running the pressure is good, and rises fast with revving the engine, but upon cranking it is very slow to rise, and only reaches 3 bar once engine has started. Question is, is the injector not closing right and therfore pump not fit to get the pressure up quick, or is the pump worn and lazy.
I know there are two different crank locking pins depending on the crank pulley, so different engine codes must have different setup. The waveform I did find was a 2007 VW Eos but it says the waveform is with the timing out, so not really useful to compare with
Users browsing this forum: No registered users and 1 guest
Pico Technology — automotive lab scopes and diagnostic equipment