Yolandi Posted July 19, 2016 Share Posted July 19, 2016 ok so travelling home I didn't have enough fuel to make the journey so I added about 20 litres of cooking oil to the quarter of a tank of diesel that was in there already, all was fine for about 10-15 miles until it started to go down on power, sort of becoming jerky at speeds over 50mph (feels like taking your foot off the gas then back on then off then on etc.) anyway this continued until I couldn't get over about 50mph and later 45 the other thing that's started is a loud tapping coming from what sounds like the top of the engine, and increases with the revs, the weird thing is that if you knock the engine off and then back on its gone and comes back after about a minute of idling the lift pump is working fine and the head gasket hasn't gone as far as I know, iv also checked the push rods are they are fine and also the caps on top of the valve stems can anyone help? Quote Link to comment Share on other sites More sharing options...
stephencdavies Posted July 19, 2016 Share Posted July 19, 2016 the oil / diesel mix could be your problem. normal diesels will run at CN40 to CN50. i'm not sure what your mix would be. it sounds like its the fuel. i would drain the tank. put some diesel cleaner like Comma diesel magic in and 1/2 a tank of clean fuel. you fuel might just be too thick. Quote Link to comment Share on other sites More sharing options...
Yolandi Posted July 19, 2016 Author Share Posted July 19, 2016 I see, would it account for the tapping as well? Quote Link to comment Share on other sites More sharing options...
ejparrott Posted July 19, 2016 Share Posted July 19, 2016 Clogged fuel filter. Veg Oil and Bio do a grand job of cleaning out your fuel tank and lines, which then all gets trapped in the filter - as it should. Change the filter and it should be fine. This time of year it won't be too high a concentration of oil (and I'm assuming we're talking 200 or 300 here?), the TDi's can run quite happily on 100% oil, I know, I have. Won't account for the tapping though. I have the same on my 200. I don't worry about it, 1 Quote Link to comment Share on other sites More sharing options...
Yolandi Posted July 19, 2016 Author Share Posted July 19, 2016 yer its a 200, the tapping is just worrying me a bit with how harsh its sounding, its never sounded like it before and I try and keep everything clean and good on my engine (regular oil and water etc) is there anything I can check to see if I can cure the noise? I just find it weird that it goes if you restart the engine and then returns after about a minute of idle or running Quote Link to comment Share on other sites More sharing options...
vulcan bomber Posted July 19, 2016 Share Posted July 19, 2016 The noise will be either the injector pump or injectors.... Whack a new filter on, there getting starved of fuel.... And lubricant. Be prepared to change a few fuel filters, I regularly run my 200 and the bosses 300 on pure veg and they both run fine. Quote Link to comment Share on other sites More sharing options...
Yolandi Posted July 19, 2016 Author Share Posted July 19, 2016 ah right I see, cheers guys, there was a lot of thicker stuff in the filter as well so Im thinking of adding a sedimenter before the lift pump, hopefully itll help somewhat with the filter life Quote Link to comment Share on other sites More sharing options...
GW8IZR Posted July 19, 2016 Share Posted July 19, 2016 Hello, is this the same engine that you asked about earlier with the loud tapping noise? Quote Link to comment Share on other sites More sharing options...
Yolandi Posted July 19, 2016 Author Share Posted July 19, 2016 not sure what you mean, this is my first thread about it unless iv been sleep posting lol Quote Link to comment Share on other sites More sharing options...
GW8IZR Posted July 19, 2016 Share Posted July 19, 2016 Probabaly me getting confused, there is a thread about a snapped rocker bolt, I just cut and paste the thread title here. I've seen rocker bolts snap after the customer reports loud tapping, it sometimes means timing belt has jumped and a big failure is imminent, so if a few things have all happened at same time it might be something to consider. HTH snapped rocker shaft boltStarted by Yolandi, Yesterday, 08:42 PM Quote Link to comment Share on other sites More sharing options...
Yolandi Posted July 19, 2016 Author Share Posted July 19, 2016 ah right yes that's mine, the broken bolt was down to the dowel not actually seating into the rocker shaft Quote Link to comment Share on other sites More sharing options...
GW8IZR Posted July 19, 2016 Share Posted July 19, 2016 just back in and picked up your reply, no probs I thought it worth checking but events not connected :-) Quote Link to comment Share on other sites More sharing options...
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