mycars12 Posted October 20, 2019 Share Posted October 20, 2019 I have a ep82 4efte motor and I have recently been having a problem with the car not wanting to start easily when warm. Basically it starts fine when the car has sat for 4 or more hours but less than that and the car will crank for about 6-8 seconds and it will slowly turn on but then it will have a low idle around 600 rpm for a little before it goes up to 950-1000 (where my idle is set) also reads lean at 16.5-17 when idling low in the 600's then goes to 14.4-14.8 when 950-1000 rpm. I have a (kinda new 6 months old) aeromotive fpr and it reads 0 when the key is in the ignition position and as soon as the car shuts off the pressure goes to 0 as well. I also do have a brand new fuel pump and it did not make a difference. Battery is new as well 2 months old. Any suggestions? Quote Link to post Share on other sites
RobSR Posted October 21, 2019 Share Posted October 21, 2019 What ECU and injectors etc is the car running? Aeromotive FPR's don't have a check valve from memory so don't hold pressure when the engine is switched off like others do for 30 mins or so Quote Link to post Share on other sites
mycars12 Posted October 21, 2019 Author Share Posted October 21, 2019 (edited) It is a stock ep82 4efte so stock injectors and stock ecu. I believe the stock injectors are 295 and the ecu is a 2 plug. Any solutions to try and hold pressure? The problem is only mostly when it is hot though. If the regulator didnt hold pressure at all how come it would start fine when warm and hard when warm? Wouldnt it start hard all the time? Edited October 21, 2019 by mycars12 Quote Link to post Share on other sites
RobSR Posted October 21, 2019 Share Posted October 21, 2019 The only other thing it’s worth checking is your coolant temp sensor. The ecu will use this to calculate fuel delivery for cold and hot starts etc. Cheap part to change. As long as your fpr holds atleast 2.3 bar when the pump primes and the engine is cranking it won’t be that causing problems. Do coolant temp sensor next and see if that helps. Quote Link to post Share on other sites
mycars12 Posted October 21, 2019 Author Share Posted October 21, 2019 Alright. I will try to find one locally and try it out to see if its fixes the problem and will report back. When i turn the key to the ignition position the pressure reads 0 on the fuel pressure regulators gauge. Gauge really only moves when the car is on. Thanks! Quote Link to post Share on other sites
Stu Posted October 22, 2019 Share Posted October 22, 2019 With a stock ecu the fuel pump only runs when the engine is rotating ie cranking or running. It doesn't run with just the ignition on. Quote Link to post Share on other sites
mycars12 Posted October 26, 2019 Author Share Posted October 26, 2019 Well. The problem was fixed. Seems like my aeromotive fuel pump was not holding pressure when shut off. I checked it after @RobSR told me about that. Swapped the original fpr on and the car is actually running very smooth now. Thanks for the help! Quote Link to post Share on other sites
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