please help with suzuki df90

[bodogg]

she has low hours and i got bad fuel,so i cleaned the tank,vst,changed filters,she has 40 psi on the fuel log,new plugs,racor,hoses,coil packs but she skips and will only turn up to 3000 rpms and at idle the air bypass tube is sucking too hard and idling too high but when i put my finger over the tube it idles correctly but still has no top end power can anyone please tell me what could be wrong? thanks jeff.

 

[grid]

Re: please help with suzuki df90

Send the injectors out to be cleaned. That has been the answer on the last 4 I've done. Suzuki loves their injectors, which is why I suggest having them professionally cleaned.

 

[bodogg]

Re: please help with suzuki df90

thank you Grid i am tearing it back down today and i will lean in the direction of the injectors. I will repost my findings,thanks.

 

[yamatech43]

Re: please help with suzuki df90

Yeah, just finished a df115 with exact problem/symptoms and it was injectors....but would have said that anyway...classic example.

 

[bodogg]

Re: please help with suzuki df90

thanks yamatech43, there is a very fine black micro grain-like substance in the injectors and is the high pressure pump,i cant figure out what that substance is,the tank,hoses,racor,vst filters and high pump are new.im truely puzzled.

 

[Silvertip]

Re: please help with suzuki df90

You said you had a load of bad fuel. Could that be the source? Is the boat stored or left unattended where devious little rat finks could have dumped something in the tank.

 

[bodogg]

Re: please help with suzuki df90

thanks everyone, I fixed the problem,it was the injectors,I made a cleaning device with a connector a wire harness,a battery and a blow gun with 40 psi setting,put nozzle to the exit side of the injector and energized the injector in quick pulses like the ecm would and you would be surprised at what came out of them. The engine now runs like it did when it was new,thanks again. jeff.