Injector duty cycle dropping to zero

[91 Turbo Mitsu]

Okay at the moment I can't download my logs from my palm but I will tell you what happened. Today I did a third gear pull to do a log and see what was going on. When I hit about 5000 rpms,had unts of knock,timing was degrees,O2 at .80 volts,O2 trim 100% the injector duty cycle dropped to 0% and the engine stumbled,obviously. Whichway do I go to find the cause. Is this what fuel cut looks like on a logger. Right before itcut out the duty cycle was at 95%. My mods page is not correct either. I haven't installed my pump or injectors yet.Thanks for any advice and please don't flame me for not having stuff right in my mods page. I put it all in the computer and went to install everything and I have been having health issues. Thanks again for any advice. Travis

 

[zippyshoe]

Yes, if your injector duty cycle suddenly dropped from 95% down to 0% during a WOT run, this certainly does sound like fuel cut. You may be trying to run too much boost or you may have a boost leak.

 

[91 Turbo Mitsu]

See thats the other thing. I am only running 14 lbs of boost so it isnt that hi. When it went from 95% to 0% it jumped right back up to like 90%. Probably because i let off a little. The effect was instantaneous when it happened. Thanks for the response. Hopefully someone else will chime in with more info help me.

 

[zippyshoe]

You should be able to run 14 lbs of boost without reaching fuel cut. I would perform a boost leak test, since a boost leak can cause you to reach fuel cut prematurely.

 

[1glaserturbo]

That's definatly going to be a boost leak. I'd test it just to make sure though.

 

[91 Turbo Mitsu]

Thanks for all the responses guys. I have been really sick the last few days so I haven't had the chance to check the car out. It seems I always forget the simple things first(boost leak). I did just upgrade alot of stuff so it is possible.