mattP Posted May 9 Report Share Posted May 9 (edited) I have a weird issue where the car will stumble and stall in D or R, but in neutral and park its perfectly fine. I had the P0456 and P1450 codes so I replaced the evap purge valve. My car has 194k miles and I find that I have to replace this valve every 80k miles or so. Anyhow, this time around I replaced the purge valve and it did NOT fix the issue. Someone had me check out the vapor canister vent valve as well, that did not fix my issue. Any ideas? My gut tells me it's fueling related because the car smells like gas when I put it in D or R. Edited May 9 by 1004ron Quote Link to comment Share on other sites More sharing options...
mattP Posted Tuesday at 06:57 PM Author Report Share Posted Tuesday at 06:57 PM So i ended up running the tests that livernois has on their handheld and I saw a P1116 code. I spent 7-8 hours tearing the car apart to get to the coolant temp sensor and replace it. I ended up breaking the tiny overflow line so I'm just waiting on that to come in to button the car up. Quote Link to comment Share on other sites More sharing options...
1004ron Posted Tuesday at 08:20 PM Report Share Posted Tuesday at 08:20 PM What did you use to read the codes previously? Quote Link to comment Share on other sites More sharing options...
1004ron Posted Tuesday at 08:22 PM Report Share Posted Tuesday at 08:22 PM I doubt that a bad coolant sensor would result in the symptoms you describe. Quote Link to comment Share on other sites More sharing options...
fishx65 Posted yesterday at 02:19 PM Report Share Posted yesterday at 02:19 PM I made the mistake of using an Autozone purge valve and I've had them replace it under the lifetime warranty 4 times. Maybe you installed a defective purge valve. Quote Link to comment Share on other sites More sharing options...
1004ron Posted yesterday at 02:47 PM Report Share Posted yesterday at 02:47 PM I've tried 3rd party purge valves that malfunction out of the box and now only use Motocraft, but I have never had the engine cut-out or stall with a bad purge valve. @mattP hasn't responded here so we'll never know what the real issue is. Quote Link to comment Share on other sites More sharing options...
mattP Posted 8 hours ago Author Report Share Posted 8 hours ago On 5/12/2026 at 4:20 PM, 1004ron said: What did you use to read the codes previously? Livernois handheld flasher. The one you use to tune the car. On 5/12/2026 at 4:22 PM, 1004ron said: I doubt that a bad coolant sensor would result in the symptoms you describe. It's a stretch for sure, but in my BMW a coolant temp sensor going will cause these exact symptoms. 23 hours ago, fishx65 said: I made the mistake of using an Autozone purge valve and I've had them replace it under the lifetime warranty 4 times. Maybe you installed a defective purge valve. I unfortunately have been around this a bunch. I've been through 4 different purge valves, 2 of them being direct from ford. Right now I'm still waiting on a coolant line to come in and it won't be until Tuesday. So thats when I'll find out if the car is still acting like a fool. If it it's I'm going to drive it until I get some codes. Quote Link to comment Share on other sites More sharing options...
1004ron Posted 7 hours ago Report Share Posted 7 hours ago I don't have any experience with the Livernois but there's been many reports of Forscan or Forscan Lite showing codes where others have failed to - that and the fact that Forscan Lite is free I always advise folks to use that. Quote Link to comment Share on other sites More sharing options...
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