Hi, the wastegate continues to stick when hot, at low speed, or idling. All seems ok at higher speeds with revs above 2500rpm. Hopefully the journey back home will be a 3000rpm, 125kmph so (touch wood) all will be okNorthern Bongolow wrote:wastegate failed under pressure.
disconnect the diaphragm operator/lever and see how loose the arm is where it goes into the turbo, ideally test the diaphragm by revving the engine past 2000 -2500 revs to see if it moves the diaphragm /arm then back when the revs drop, or it may work the other way round, you may have to operate the arm on the turbo manually after its been lubricated to get the turbo to boost up to give pressure on the pipes to operate the diaphragm arm. this is to see which bit is sticking/failing. if its the variable vane turbo which i think it is the arm into the turbo may feel free until the temps get really hot like when its been running a while, this is because when hot the vanes stick with carbon build up inside, this is the main reason for blocking the egr valve off, the egr puts dirty exhaust air back into the inlet manifold to be reburnt to clean it up to lower the emissions, in this country its not needed as the emissions are low enough to pass the mot here without it . the only down side is you may see higher engine temps as the burn is better from cleaner air.
egr valves. yours should have 2 on it, they are piped via the lump of extra scrap that is the egr gasses cooler,member on here called briwy ripped the lot off and threw it in the bin. the egr valves have position switches on the top so even if the valves are partly working the switch may not register it so it flags up a fault, another well respected long time bongo owner on here spent nearly a year finding this fault.
http://lushprojects.com/bongopartsmk2/c ... o=.html#14
fuel shut off.
ignore it, if its not working it wouldnt either stop the engine, or allow it to start.
briwy is on this link from the vw forum have a read, they have the same problems we have, maybe an italian tune up may be needed, thats hard to do in limp mode though
https://vwcaliforniaclub.com/threads/li ... ease.6401/
and when back home I can take note of the further recommendations around the EGR etc. A final question before I sign off, if the bongo goes into limp mode (no turbo/wastegate working) is it ok to drive without long term damage... I'd prefer not to call out roadside recovery... eeek!
A big thank you!
.
the bongo seems to maintain speed ok, but will definitely keep an eye out for hills.
