Reaching out to the brotherhood on people who have had either issues. If you have could you please describe what happened on your car for symptoms. some posts did not always have the symptoms but rather how to replace. thanks
Well I haven't tackled it yet but if the car sits for a while it is hard to start. I suspect it has to do with the fuel pressure regulators being 26 years old. When I finish my engine stand I am going to go through the entire fuel system and replace all the hoses, rebuild the pumps, and tackle that issue.
Its old oct 12 Working through the stuff we talked about Also trying to help data base on here before discussing with you could not find pressure regulator Symptoms but in other thread not this one Still need too switch d/s coil
Some symptoms will be if the regulator diaphragm fails and let’s fuel into the vacuum hose 1) running rich at idle 2) flooding (no start) 3) fowling spark plugs (wet with fuel) 4) smelling fuel in the intake after the engine is off This are a few thing there is more but these are easy to check Next if the valve sticks closed 1) loss of performance in mid to high range driving 2) codes for running lean 3) over heating when driving hard (most on hot days) 4) engine knock (predestination do to high cylinder temperatures) Again just a few And if the valve is stuck open 1) loss of performance at idle, low rpm and speed (lack of response and sluggishness) 2) fowling plugs if idling for long periods of time 3) codes for running rich 4) clogging CATS if idling for long periods of time and low rpm and speed This are just a few there is more If you have access to scan tool just look at short and long term fuel trims Short should be close to 0 as possible +4 -4 is ok this is how the ecm corrects fuel after reading o2 sensors long term numbers are what the ecm is going to off set the fuel term so that the short term doesn’t have to work as hard and keep the term in lower numbers (aka range) if u have low counts in both long and short this means that the ecm is taking fuel away because of running rich which can be from regulator Again there is more but too much to type lol Sent from my iPhone using FerrariChat.com mobile app
