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Rough idle

Posted: Sat Sep 24, 2022 9:40 am
by Cashie123
Hey guys am in a bit of a pickle was driving the other day and my Ute started misfiring and stalling worked out the lift pump in the tank wasn’t working have fixed that but now it’s still running really rough have bled the fuel system with no success have hooked up to forscan and am getting all sorts of codes has anyone here had this particular issue before that could point me in the right direction TIA

Re: Rough idle

Posted: Sat Sep 24, 2022 12:51 pm
by RossPat
I suggest you clear all the codes then drive for a while then scan again
The errors that return will give you a better reference.

Re: Rough idle

Posted: Sat Sep 24, 2022 6:47 pm
by Cashie123
Hey tried that already but have found the issue had a cracked battery terminal

Re: Rough idle

Posted: Sat Sep 24, 2022 7:15 pm
by hbtranger
From my experience the freeze frame data needs to be collected at operating temp. Good luck finding reference values though, you'll find some though the motorcraft website but not all as it appears to me that Ford keeps the reference values in their proprietary software. Snapon tools etc do have some as well.

From what you are describing, it could be many things from contamination to a dodgy sensor. I'd check the suction control valve pressure against the target value. The SCV is susceptible to contamination...

Before any of this though, I'd drop into a shop get someone to hook up a computer that compares values against reference values for you. You'll spend a lot of time here looking for answers... forscan is good for reading values but it doesnt do any interpretation.

Re: Rough idle

Posted: Sat Sep 24, 2022 9:59 pm
by Lincolnland
Issue was posted above. Gota love the easy fixes