007specb Posted May 3, 2015 Share Posted May 3, 2015 hello all, I am having an issue with hesitation under load. mods are: turbo back exhaust grimmspeed catless uppipe DW300c Fuel Pump ID1000 Injectors Grimmspeed 3 port EBCS base tune for e85 I have spent the past two days working with a mechanic running diagnostics on the potential causes of the hesitation. first, we have checked every area for vacuum leaks. I purchased a MAF to see if this may have been the culprit, no luck. checked spark plugs and coil packs on cyl 1 and 3 all look good, gaps are in tolerance and are not fouled. all injectors are firing. the A/F ratio hovers around 14.5-14.8 on idle. and most of the time it will stay in that range, however i sometimes get to an A/F value of 20 and this is when it really starts getting jerky. i have come up with two conclusions one, potential electrical issue shorting of a wire or ground maybe. another thought is fuel pressure may not be as high as needed, but this does not really make a whole lot of sense since it doesnt just happen when it is under load. any ideas guys?datalog27.csv Link to comment Share on other sites More sharing options...
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