H_D Posted May 7, 2019 Share Posted May 7, 2019 (edited) Running td04, stock ecu and 6psi boost. Afr gauge is reading between 13-14 on boost with wide open throttle so i switched it off immediately. The AFR readings are fine on startup, idle and when off boost. In terms of the fueling setup the follwong has been done.... walbro pump fitted about 7 years ago, recently had the injectors rebuilt and tested, new genuine fuel filter, stock FPR. I have checked the map sensor and getting a solid 5V all new vacuum lines on it too. Also replaced the vacuum line for the FPR. Spark plugs also indicate its running lean Any suggestions??? Edited May 7, 2019 by H_D Quote Link to post Share on other sites
H_D Posted May 7, 2019 Author Share Posted May 7, 2019 I have also checked the injectors and loom with a multimeter and no irregularities found there either Quote Link to post Share on other sites
gorganl2000 Posted May 8, 2019 Share Posted May 8, 2019 how old is the wideband sensor? fuel pump/wiring/relay failing? do you have any engine diagnostic codes? at 6psi the stock ecu should be well rich wit that set up Quote Link to post Share on other sites
H_D Posted May 9, 2019 Author Share Posted May 9, 2019 (edited) Brand new wideband fitted and tested, going to check the fuel pump tonight. Dont think its the relay as i can hear the pump whining, also no stored codes when i did diagnostics Edited May 9, 2019 by H_D Quote Link to post Share on other sites
RobSR Posted May 10, 2019 Share Posted May 10, 2019 Check voltage at fuel pump, im working on a GT atm which has a voltage drop across the whole EFI circuit. Check grounds etc too. Quote Link to post Share on other sites
H_D Posted May 10, 2019 Author Share Posted May 10, 2019 20 minutes ago, RobSR said: Check voltage at fuel pump, im working on a GT atm which has a voltage drop across the whole EFI circuit. Check grounds etc too. What should the voltage be? Quote Link to post Share on other sites
H_D Posted May 11, 2019 Author Share Posted May 11, 2019 (edited) Getting 13.55v at the fuel pump when the car is on idle Edited May 11, 2019 by H_D Quote Link to post Share on other sites
RobSR Posted May 11, 2019 Share Posted May 11, 2019 Yup that’s all good Quote Link to post Share on other sites
H_D Posted May 12, 2019 Author Share Posted May 12, 2019 (edited) Everything now points at the fpr. Guessing the diaphragm is stuck and not opening properly on boost. However the connections in the pump were not 100% secure so i replaced them. Didn't get a chance to take it for a proper test drive last night but went into boost for a abt 2 seconds and afr went to 12. And its also idling a bit richer too Edited May 12, 2019 by H_D Quote Link to post Share on other sites
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