misfire above 2500revs

[drummer]

hi this is my first visit to this forum.im onto my second bongo but the first ever problem.it all started at easter,first my top hose burst causing my head to cook,i got a head from ebay and had it skimmed and pressure tested,while fitting it i found the water pump was worn so i replaced that as well,when finished i started the motor only to find that it misfires and smokes badly over 2500 revs but runs perfectly below 2500,it will run for an hour no problem,water does not is not pressurising and not overheating ive also had the turbo off and that is ok,any suggestions are welcome,cheers.

[scanner]

That sounds like an injector or injector pump problem.

[francophile1947]

Could it be fuel starvation? Have you checked your fuel filter and the little banjo filter on the fuel pump?

[scanner]

Could it be fuel starvation? Have you checked your fuel filter and the little banjo filter on the fuel pump?

Why would starvation cause smoke? That is usually too much fuel, not too little.

More likely to be a blocked air filter - have you checked that?

[francophile1947]

Could it be fuel starvation? Have you checked your fuel filter and the little banjo filter on the fuel pump?

Why would starvation cause smoke? That is usually too much fuel, not too little.

More likely to be a blocked air filter - have you checked that?

I don't know, that's why it was a question - just seem to remember a similar post in the past

[drummer]

i forgot to say,new oil filter,fuel filter and air filter,where is banjo filter?,cheers.

[missfixit70]

On top of the fuel pump, you'll have to firkle it out with a cotton bud or magnetic screwdriver tip thing, it's only just bigger than the cotton bud head, be very careful with it.

[daveblueozzie]

FIRKLE is that a technical term

[scanner]

You'll know that if Kirsty ever Firkles you with a cotton bud.

[missfixit70]

Yep, as is FUBAR & NFG

Scanner

[mikeonb4c]

If I'm not fettling, I'm forever firkling or fiddling or faffing or sometimes just effing about

[bigdaddycain]

Hi Drummer, when you say "misfires above 2500rpm",could that also be construed as a reluctance to rev beyond 2500rpm, accompanied by coughing and spluttering?

I'm thinking that your fuel pump could be leaking, and taking in air,and not suppliying sufficient amounts of fuel when the demand arises? Or perhaps one of the pipes to the fuel pump has sprung a leak?

[drummer]

thanks to all for your suggestions,theres plenty of fuel at the injectors cos i checked that there was a flow at the return pipe when revving hard so i think starvation is out of the question,but how can i check the injectors?,can they be cleaned,.ive put a full can of injector cleaner through it?.cheers