kotbehemot Posted October 28, 2013 Share Posted October 28, 2013 (edited) Hi,I have measured fuel pressure with stock FPR and standard fuel pump. Results (@ inlet preasure -> fuel pressure): @ 0 bar (engine off, fuel pump running) -> ~3 bar@ -0.7 bar (idlling) -> ~2.4 bar@ +0.7 bar (on boost) -> ~3.3 bar I am afraid that fuel pressure on boost is too low. Shouldnt it be around 3.7 bar?What is stock fuel pressure? Engine is standard 4E-FTE with standard pump, standard FPR, standard turbo CT9, 2.5" exhaust. Edited October 28, 2013 by kotbehemot Quote Link to post Share on other sites
mech5107 Posted October 28, 2013 Share Posted October 28, 2013 I haven't measured it at boost but do you have a wideband? Quote Link to post Share on other sites
TurboTobz Posted October 28, 2013 Share Posted October 28, 2013 Would be handier to know your afrs rather than pressures, because every engines different... Quote Link to post Share on other sites
RobSR Posted October 28, 2013 Share Posted October 28, 2013 Whats your AFR's on WOT? Quote Link to post Share on other sites
kotbehemot Posted October 28, 2013 Author Share Posted October 28, 2013 (edited) Problem is that i don't have wideband. Only standard lambda sensor with single wire. I have checked fuel pressure becuse during cold start: if i try to start the engine right away i have hesitating.But when i wait a while with fuel pump on, then it starts faster.So my shot was that pump dies , because it seems that it needs more time to build the pressure. Also pump is whining all the time. Something like Walbro does. I have pulled out the pump today and .. i have no idea what it is.There is written (see picture):4124E12VMADE IN JAPAN It doesnt look like original beacuse it has "custom mounting system" Is there any point changing it to genue one? Uploaded with ImageShack.us Edited October 28, 2013 by kotbehemot Quote Link to post Share on other sites
mech5107 Posted October 28, 2013 Share Posted October 28, 2013 After you shut engine off, what is the fuel pressure? It should stay at a bar or so...there is a check valve I think... Quote Link to post Share on other sites
kotbehemot Posted October 28, 2013 Author Share Posted October 28, 2013 After shutting engine off , fuel pressure was droping slowly. But i didn't wait to see what value it will drop to. Is it good idea to buy AFR gauge for 1V lambda sensor?I know that reading wont be accurate , but at least i would know if its runnig rich or lean. Quote Link to post Share on other sites
rmsnoel Posted October 28, 2013 Share Posted October 28, 2013 You can attach a meter to the diagnostics plug to show lamba sensor voltage. Quote Link to post Share on other sites
TurboTobz Posted October 28, 2013 Share Posted October 28, 2013 Only reliable way is a health check on a dyno or wideband kit, depends if a wideband kit costs more than engine rebuilds lol. I would Definately wideband that before you do some serious damage Quote Link to post Share on other sites
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