Got a Triton here that has dropped a cylinder (6) after bottoming out on a sandy overland beach track.
Mechanic has had it for days and has tested everything or so he says. Injectors, intake manifold, cam, fuel injectors, coil packs, plugs etc.
Any ideas what else it could be? He says the piston isn't seized, its getting fuel and spark but just isn't firing.
I'm thinking the heavy bump on the sand has knocked off something or other making number 6 not fire.
Thanks.
rctr,
Oct 21, 8:24pm
Has he checked power transistor. Common if they fail it will drop cyl 1 or 6 usually will put a check eng light on as well
t5rica,
Oct 21, 8:33pm
Thanks rctr. I did ask him if he had checked that but he said they wouldn't spark if it wasn't working. I have since learnt from you and others that that's not the case.
Will try and get a replacement and see if that works.
franc123,
Oct 21, 8:39pm
The question is how has spark delivery been checked? It can still be insufficient to fire a plug under compression yet be ok in atmosphere.
t5rica,
Oct 21, 8:42pm
I did ask him if he had checked the resistance of the leads with a meter. he said yes, but I have my doubts. Problem with the 6g72 is you have to take the whole intake manifold off to get to cylinder 6. So it'll be very difficult to easily check it when he puts it back together.
I really don't want to tell the guy how to suck eggs, but I have a feeling he has totally run out of ideas.
t5rica,
Oct 22, 8:23pm
Still lost, now he's sending the ECU off to be read by an expert.
t5rica,
Oct 22, 8:23pm
Ignition module it wasn't.
phillip.weston,
Oct 26, 1:31pm
if it was the ignition module/power transistor or coil packs it would drop two cylinders not just one as they are a wasted spark arrangement firing in pairs. To me it sounds like an injector fault. I would swap injectors and see if the fault follows the injector or remains on that cylinder. If it remains on that cylinder then it could be something mechanical.
phillip.weston,
Oct 26, 1:32pm
The ECU also batch fires fuel too so if it were an ECU fault you would expect multiple cylinders to not get fuel or not get spark rather than just one.
t5rica,
Oct 28, 8:28pm
Thanks for the help everyone, turns out the timing belt had jumped a couple of teeth and advanced the timing.
2000 bucks later I have everything replaced.
Even though it is an interference engine I was lucky enough not to bend valves and what not.
PITA
phillip.weston,
Dec 20, 8:27pm
Yes interference engine indeed but the MK 6G72 is lower compression and can afford to have the timing out a few teeth.
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