loss of power off boost? 2.5 Turbo Diesel 2wd auto box

[v8griffith]

Hi can I start with saying hi to all here. I have just joined the Bongo ownership crew and love my new purchase however a couple of small problems to sort and a few already sorted.

Main problem at the min--- replaced a glow plug yesterday as it was smokey and lumpy at cold startup and following this it ran better but noticed today that i seem to have lost power under 2500 rpm and have very poor acceleration from a standing start? one of the rubber tubes that was connected to the rear solenoid in top of the engine above the injectors was brittle and had come off the solenoid stub so i replaced it with a new rubber one and connected the other end to the air inlet pipe between the air filter and the turbo inlet.
the engine is smokey at full throttle but this seems normal ???? when it gets up to motorway crusing speed of around 50-60mph the power seems normal..

any suggestions what to check would be welcome

Best regards
Ken n Moira

[Northern Bongolow]

chuck the seat up and check the rubber pipe that you fitted. this may collapse and block when revving hard. the standard pipe should be thick wall vac pipe, not thin wall rubber.
if its collapsing under vac the coldstart solenoid may be held on as though its on half choke. (and run badly) has it stalled at all ??.

did you reuse the little green one way valve, or did you btpass it or remove it alltogether.

[Northern Bongolow]

could also check for leaks under the middle of the fuel pump---the throttle advance side seals, had to do mine today as acceleration was a little off, new seals sorted it.

or check the vac advance pipe that is on the inlet manifold front end and goes to the fuel pump advance diaphragm on the top of the pump. when these are busted the acceleration really suffers.

[v8griffith]

Thanks for the reply.

When I replaced the tube it was with thick walled vac tubing but unfortunately the small one way valve broke as the original tube was so hard. I mistakenly thought the valve was a filter so missed it out.
Strangely enough the bongo seemed to run fine with the tube off before i managed to get a replacement.
Not sure if it was a coincidence but it was the first time that it was loaded up with 6 people on board when i noticed the very poor acceleration from a standing start but when it got revving it was ok but quite a lot of smoke at full throttle.

I have been out in it again today with only me in it and it seems back to normal???? is it that bongos just take a while to get moving when loaded up?

I will also have a look at the other things that you suggested

Thanks for the support

Ken n Moira

[v8griffith]

Sorry meant to say it's never stalled either

Ken n Moira

[hijimhere]

Did you find vacuum pipe to EGR valve off and refitted it - Simon at Harbury changed my cambelt he found the pipe off and refitted it --the result was that the engine was gutless and struggled at the any gradient. I went back and he took the pipe off again = problem solved.

[v8griffith]

Hi

the only pipe i replaced was the one to the most left solenoid above the glow plugs looking from the drivers side. I will check the egr valve and try disconnecting the vac tube from it but could you assist me in letting me know where the egr is on this particular engine as i'm a newbie to the bongo but very experienced with engines in general

Ken

[Northern Bongolow]

the egr valve is mounted at the back of the head on the drivers side, just above the little green one way valve you mentioned.

one of the ways the engine can get strangled is to block the vac pipe, as i said before this can (choke) the pump. if your egr valve is stuck this can give the same symptoms as above, as the vac cannot be dumped into the air pipe when not required.

what actually happens is the suction on the turbo air pipe closes the one way valve shut, this gives vac via the vac pump to the cold start solenoids and the egr valve, when the engine isnt running the valve opens and dumps the vac in the system to relax it.

[v8griffith]

just an update on the loss of power and black smoke thing....
have just found out that power is normal until the engine is at full temp then it looses power when pulling away with lots of black smoke so tried pulling off the new rubber hose that i put on the solenoid that connects to the air intake and wow the power is back with no smoke???? should i leave the hose disconnected or do i need to try to get another green one-way valve to replace the one that broke? not really sure what the valve is supposed to do... will running with this hose off cause any other problems.

Best regards and thanks for all the suggestions so far

Ken n Moira

[Northern Bongolow]

have a read through this mate in the thread there are various links, open them up all should become clear.
http://igmaynard.co.uk/bongo/forum/view ... ds#p547719

get a green valve from the scrapyard or mazda. they are fitted to all or most of the mazdas,both petrol and diesel even the 03 reg ranger engines had them. (messing with one just today).

[v8griffith]

That was a great help thanks and some useful links there.

KnM

[hijimhere]

I had loss of power when I had EGR pipe put back on - took it back off and runs fine