2011 Ford Escape Surging/Stalling No Codes
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Are you able to verify the to TCC slippage is under 50 rpms with a scan tool? Just to eliminate what the dealer has suspected.
Do you have a scope? This could be very usefull to monitor what the PCM is "seeing" during the surge/stall.
Monitoring various inputs could prove usefull to see what's missing during the stall. IE, Crank and cam signals, ignition coil feeds, injector feeds.
With a scan tool what is the Injector Pulse width and MAP signal doing during the surge/stall?
Just because the TB is new doesn't mean it's good, Scope the signals on the TB and APP during the stall as well.
Some times when it's a no code present, we just test what is good to narrow the path to what may be bad.
Try removing the accesory belt too and recreate the stall condition.
Never stop Learning.
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As far as the throttle body goes, I plan to replace it for a third time tomorrow, only this time, I will be doing it with an OEM Ford one from a dealer as I've had issues similar to this in the past with aftermarket parts.
Fingers crossed for a fix.
I'm following along because I had a head scratcher very similar to yours a few years ago. Same vehicle, engine, complaints. New throttle body of unknown origin. Airflow trim PIDs kept climbing and climbing, never leveled out.
While chasing my tail on the idle issue, I ran a relative compression and found a leaking intake valve. Customer didn't like my engine repair quote and left. But I was never fully convinced the leaking valve was causing the idle problem.
Anyway, with your Escape, it may be worth checking physical timing. I know you're not getting any timing faults, but that doesn't mean the engine is in time. It's possible to have the crank reluctor and the camshafts in time relative to each other, but still have the crankshaft out of time.
Last idea I have is the purge valve sticking open. Might be worth a check, despite the good trims and no EVAP faults.
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The misfires clear up over 2500 RPM? and is this no load in park, braked torqued or under normal driving conditions?
What are your fuel trims doing during these misfires? (maybe fuel pressure is dropping?)
These are 2 wire cops, can you verify with a scope primary ignition misfires? Do a relative Compression test with a Spark sync as well.
Any resistance to the crankshaft that can cause a slow down of crank speed could be logged as a misfire by the PCM.
It would be good to verify a good crank signal as well.
Is this a flex fuel?
Never stop Learning.
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I just performed a compression check and ruled out a mechanical issue. Cylinders 1 and 2 had 175 and cylinders 3 and 4 had 180.
After performing the compression check, I swapped all four coil packs around (1 to 3 and 2 to 4) to see if cylinders 1 and 2 started misfiring worse. Not only did they start to misfire worse but all 4 cylinders are misfiring bad, with number 3 still be the worst. The misfires don't start until about 1800 RPM according to the scan data. Looking at the balance test, all four cylinder are contributing equally. If I try to disable one injector the engine completely stalls. This is really weird because the engine stalls at idle under a load and starts misfiring at around 1800 RPM when not under a load.
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- MarkBeck101
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