Hi guys, not been on for a while as working offshore now, and my old man now drives the ovlov in my absense
Im a bit lost on this one, and really hoping you guys can help.
My T5 has been running sweet as a nut for the last year or so, but my old man went to start it the other day, the engine span over healthily, but it just wouldnt fire?
I was away at the time (work offshore), so when I got back, I tried starting it, but just no luck.
Opened the bonnet, and when the ignition is turned on the grey fuel pump relay thats located under the cover at the back of the rad is chattering away randomly? Also the coil was buzzing away continuously (so being constantly energised)
I had spares for both, so first swapped the fuel pump relay over, same symptoms, then swapped the coil, same symptoms...
You can hear the fuel pump is wurring away when you turn the key, and I checked the fuel rail was being pressurised by bleeding it whilst the ignition was on, and plenty of fuel gushed out into the jar, so im adamant its not the fuel pump thats faulty?
I noticed though that when I disconnect the grey fuel pump relay, the coil stops buzzing, so they are def linked somehow?
Put everything back, and tried to figure out what could be causing all this.
Unluckily, haynes doesnt have a single wiring diagram for the grey fuel pump relay, dug out my copy of VADIS, and no luck on their either (unless Im missing something?)
Anyway last week, I resorted to calling out a autoelectric engineer who went through all the connections and joints for:
crank sensor
cam sensor
fuel pump relay
coil
fuel pump
all seemed ok, and had very little of no resistance across the joints
he also tested all the connections to the ecu mouth organ from each item, again all came back ok/acceptable?
So he couldnt really determine what was causing the problem?
Then, bizarrely enough, we pulled a plug to check it was still sparking and the bloody thing started on 4 cylinders!
put the plug back in, and problem seemingly solved, the thing purred away brilliantly. I started/stopped it about 6 times to make sure it wasnt a fluke, and had no problems at all, so put it down to a dodgy connection on one of the above that we had fixed while messing about.
But....the very next day and back to square one, cylinders not firing and the fuel relay crackling away?!!!
From a search on here last week for starting problems, one thread stated that when you span the engine over, the tacho should move? And If it doesnt, then the crank sensor might be dodgy/dead? Is this true?
Well mine doesnt even twitch when you spin the engine over, so that might be a clue?
Before I go changing over other components willy nilly though, Id really like to track down a wiring diagram that shows how the grey fuel pump relay is wired in? can anyone help?
There are no ovlov dealerships over here anymore, so Im knackered in that respect
Sorry for the epic whinge, just trying to give as much info as poss! And need to get the car running for my old pa ASAP
Thanks all
Joe
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