F4Gary Posted February 2, 2025 Report Share Posted February 2, 2025 (edited) So was out cleaning up the interior and had the engine idling. About every 15 seconds the idle would slow a bit with the lower idle shudder, and then recover to normal. Like is would slow 75 rpm and then recover. Any ideas? Haven't checked for a code yet and now light on the dash. Car runs fine otherwise. 2017 Edge Sport 2.7L Edited February 2, 2025 by F4Gary Quote Link to comment Share on other sites More sharing options...
1004ron Posted February 2, 2025 Report Share Posted February 2, 2025 Was it with a full tank of gas? Quote Link to comment Share on other sites More sharing options...
F4Gary Posted February 5, 2025 Author Report Share Posted February 5, 2025 I don't think so. Quote Link to comment Share on other sites More sharing options...
1004ron Posted February 5, 2025 Report Share Posted February 5, 2025 Best get the stored error/fault codes read and that should offer some direction - I'd guess that it's the evap system, but reading the codes is the way to go. 1 Quote Link to comment Share on other sites More sharing options...
Got 2 Posted March 28, 2025 Report Share Posted March 28, 2025 Did you have AC or defroster on? (The default startup climate settings used to put the defroster on at start. And the defroster is meant to act as a dehumidifier to "dry" condensation on the inside of the windshield as well as melt ice on the outside.) The defroster controls won't show you the AC is on. And the compressor cycles on and off quite often. At idle, that's usually enough of a load to make the engine labour a bit until the throttle catches up to the load. 1 Quote Link to comment Share on other sites More sharing options...
vrdublu Posted May 20, 2025 Report Share Posted May 20, 2025 I've had this issue while using 87. Could've also been a bad tank of gas, either way it was on 87. Only using 93 now. Quote Link to comment Share on other sites More sharing options...
KBlueSuv Posted 23 hours ago Report Share Posted 23 hours ago This low-idle issue used to happen every time I filled up with 87. It would last until I got home, and be fine after that. I also switched to 93 octane and it appears to have resolved the issue. Quote Link to comment Share on other sites More sharing options...
1004ron Posted 23 hours ago Report Share Posted 23 hours ago (edited) 2 hours ago, KBlueSuv said: This low-idle issue used to happen every time I filled up with 87. It would last until I got home, and be fine after that. I also switched to 93 octane and it appears to have resolved the issue. I don't believe that the octane has anything to do with it - mine does exactly the same on the higher octane Costco top tier gas and the only thing that resolves it is a new OEM Motocraft/FoMoco evap valve. Part # GL3Z 9B325 B . Edited 21 hours ago by 1004ron 3 Quote Link to comment Share on other sites More sharing options...
Oldandintheway Posted 23 hours ago Report Share Posted 23 hours ago 5 minutes ago, 1004ron said: I don't believe that the octane has anything to do with it - mine does exactly the same on the higher octane Costco top tier gas and the only thing that resolves it is a new OEM Motocraft evap valve. Most definitely the EVAP (aka Purge) valve. Very common issue. And not just a Ford thing. Most commonly rears its ugly head right after filling up, regardless of octane. If left unchecked, can cause a host of issues, not limited to fuel tank deformation and charcoal canister failure. 2 Quote Link to comment Share on other sites More sharing options...
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