6.0 Rough Idle
06-20-2019, 12:21 PM
#1
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6.0 Rough Idle Need a little trouble shooting help.
My car was running perfect up until this past Sunday. I go to start it and its idling horribly. I had just driven it friday with no issues! I checked the plugs and they are all black with carbon build up so it's running rich.
I don't have any vacuum leaks that I can see, it has a speed density tune so the MAF is not the issue, has a brand new Coolant Temp Sensor. In fact, all the sensors are new outside of the MAP sensor as this is a recent swap in to my classic car.
I'm not getting any codes on my scanner.
The only thing I can think of is a fuel delivery issue. Maybe the regulator or pump are faulty? I have an external in-line pump installed.
I tried to start it again this morning and it will barely start now.
Any Ideas?
My car was running perfect up until this past Sunday. I go to start it and its idling horribly. I had just driven it friday with no issues! I checked the plugs and they are all black with carbon build up so it's running rich.
I don't have any vacuum leaks that I can see, it has a speed density tune so the MAF is not the issue, has a brand new Coolant Temp Sensor. In fact, all the sensors are new outside of the MAP sensor as this is a recent swap in to my classic car.
I'm not getting any codes on my scanner.
The only thing I can think of is a fuel delivery issue. Maybe the regulator or pump are faulty? I have an external in-line pump installed.
I tried to start it again this morning and it will barely start now.
Any Ideas?
06-20-2019, 01:06 PM
#2
TECH Senior Member
O2 sensors and/or MAF sensor, to start with.
06-20-2019, 07:51 PM
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@Old Geezer Going to grab a pressure gauge tomorrow. Hopefully I can get it to idle, won't even start now and if it does it cuts off.
06-20-2019, 08:43 PM
#6
TECH Senior Member
It should pressurize with just the key on. 58psi is what you should get before it even starts.