5.0 rough idle at startup when warm
#21
Senior Member
Do you by any chance still have the service records for this with the dealerships diagnostics notes? I'm diagnosing this myself and trying to understand what the dealerships are doing to confirm these problems. I think I've found enough to support my conclusions but apparently not. My truck is doing this same thing along with several other things and after 5 visits to dealerships, they say that all of this is normal. I posted more in detail in this thread along with videos: https://www.f150forum.com/f118/5-0-p...ilures-381192/
#22
Yeah, it's unfortunate too because all of these problems are relatively easy fixes. Ford and their dealerships just want nothing to do with the issues until they're out of warranty. Unfortunately, as simple as the fixes are, the parts are extremely expensive and labor hours inflated as well. So once you get out of warranty, expect a 1500-2500 dollar bill to fix the problems. It's one of the reasons I'm doing all the leg work now to get the problem resolved before it causes other problems. I still love the truck, just hate Ford's lack of accountability to their customers. I've been looking at Toyotas as well...they're inferior in many ways to the F-150 but if you're willing to settle for less in terms of performance, features, and appearance to have a dependable truck, then Toyota's the way to go. GM, FCA, and Nissan are worse than Ford in terms of reliability...yet I've heard many say those companies stand behind their products. I can't say the same for Ford. Talking to an attorney recently about my truck, he said his experience has been that Ford is one of the worst in admitting issues to the customer, but when pushed in litigation, they tend to give in easily. The idea is that for every 100 customers that have this problem, the dealer smoke screen will be enough to send 90 of them home after awhile, the remaining 10 that are committed to getting their problems resolved push. In the end, rather than fixing 100 trucks, they spend next to nothing on 90, and the amount spent on the other 10 is still far less than if they would've made all 100 whole. From an actuarial perspective it works in the short term, but in the long term, loyalists like myself jump ship. It used to be brand loyalty was fairly sticky in the light-duty truck segment...that's changing. Ford's gambles on quality and customer service...along with their gamble to divest in passenger vehicles as gas prices skyrocket...makes me believe the company will be a shell of its former self in 15 years or so. I'm willing to start looking at shorting their stock, especially if some of the quality issues with the F-150 start to become well-known.
#23
For what it's worth, my experience with this problem in other engines and platforms has been vapor lock in the fuel rails. Once you get the fuel flowing (10-15 seconds) it runs fine. Haven't had the problem in my 5.0
#24
Interesting, never thought of that. Although, I just was able to test a couple of other Fords with VCT and compared to my results with my truck...with cam torque actuated VCT, it's supposed to be extremely quick to respond at idle with different throttle inputs. I tested with an Edge 3.5 with CTA and a Fusion with OPA phasers. The fusion has 3xx,xxx miles on it and the Edge has 6x,xxx miles. Even while stabbing the throttle on both of them, I never saw the VCT error values go past +/- 15% (and it happened very rarely...most times sat below 5%). My truck's VCT solenoid error will hit +/- 40% on occasion with +/-20+% common. My problem is due to the phasers. I even was able to find a VCT diagnostic check from Ford...ran KOER and it ran like ****. No codes...but on the other vehicles, they did not run that way. You could feel my truck stumbling pretty badly while it sat around 1700 RPM. I don't know how I convince a dealership to look but this is what my problem is, I'm 90% sure at this point. It's causing the taps at idle, the misfires, etc.
Last edited by gopherman; 05-28-2018 at 03:32 AM.