Intermittent (Fuel Pump??) Issues.
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Intermittent (Fuel Pump??) Issues.
The car will start up and drive just fine until you shut it off (you have to drive it until it gets hot i presume because this issue will not occur if you drive it for short periods or when it is cold outside and sometimes you have to drive it for hours for it to occur), once you shut the car off and turn it back on it will idle fine for about a minute or so then slowly will start to misfire and idle rough,after a few minutes the misfires and rough idling gets worse (it will eventually kick a code after the misfiring ramps up slightly)until the vehicle stalls.You are not able to start the vehicle for multiple hours(sometimes it will start up about 30 mintues later but it really depends).Once the car will eventually start back it runs fine until you shut it off again and then the problem persists.We are getting multiple codes with our scanner.Codes P0191,P0171,P0174,(P107B??)P0301,P0302.This issue has been going on for about a year and we have not been able to fix it, have done multiple things to try to remedy the issue ie: replacing both fuel pumps (there was a recall on one of them that we got done)swap around relays,Vehicle starts up just fine, you can drive it for a little while and then shut it off.I have done alot of research on this issue and I have narrowed it down to a couple things, Fuel pump driver module, Fuel pressure regulator,or Fuel pump relay(maybe crank position sensor dont really think so though.).This has been a thorn in my side ever since we purchased the vehicle and it is really unfortunate because it is such an amazing car and i do not want to sell it! Thank you.
2018 IS 350 F
2018 IS 350 F
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