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98 Corolla Rough Idle Sign up here! Search this forum this category all forums for All words Any words Whole Phrase (search options) Auto Repair Home>> Automotive Repair>> Car Troubleshooting TFM New User Mar 28, 2018, 6:02 PM Post #1 of 3 (1460 views) 98 Corolla Rough Idle Sign In Hi There I have a 98 Toyota Corolla VE. Recently the check light came on and I was given the P0441 and P0446 codes. The 441 has been present for years because I have a leaky gas cap so thats not really relevant but worth mentioning. The 446 code came on about a week ago and was accompanied by a very rough idle in drive while stopped which became worse and is now rough in park and when taking off. The roughness goes away after getting going at speed. The idle is super rough and stumbles every few seconds. After doing some research and reading I have narrowed the issue down to the engine VSV, the purge valve VSV, the purge valve itself, the canister, or cracked tubing. Not sure where to go for there though and any help would be much appreciated as I would rather do the work myself than having a shop test everything and costing me a fortune! Tom Greenleaf Ultimate Carjunky / Moderator Mar 28, 2018, 10:28 PM Post #2 of 3 (1417 views) Re: 98 Corolla Rough Idle Sign In OK: You don't know it was or is from a gas cap just evaporative emissions code the cap is a guess You've ignored probably just making it progressively worse now time top pay the Piper. FYI - most gasoline has ethanol in it which absorbs moisture right out of the air if not sealed and used up. Corrosion and problem just follow the fuel becomes a desiccant (absorbs moisture/water) is wrecking you fuel system now about a 20 year old vehicle just makes it probably need more replaced to get it all intact. So called rubber components only last so long both time and faster with ethanol to degrade. Google or search that out you get a creamy salad dressing for fuel. Look at more than one they are full of misinformation as to adverse effects or is the stuff good for anything so careful what you believe out there. Now that you've waited till it runs lousy that "fortune" to fix just got a lot more costly! You should know now that it runs poorly, the sensors and converter will take a hit or be ruined most likely next if not already if you keep ignoring it. I suggest you need help for a full diagnosis, estimate of costs and what else might have been harmed by a professional in person if you tended to that "years" ago you probably wouldn't be in this predicament. Sorry for bad news but ignoring warnings just makes things worse. They aren't there for amusement, T Discretesignals Ultimate Carjunky / Moderator Mar 29, 2018, 3:29 AM Post #3 of 3 (1379 views) Re: 98 Corolla Rough Idle Sign In Disconnect the vacuum hose that goes from the purge vsv to the intake manifold. Cap off the vacuum port and see if your symptoms go away. If they don't, you have another issue causing your problem. Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved. (This post was edited by Discretesignals on Mar 29, 2018, 3:31 AM)   Automotive Repair     Auto Body Repair and Refinishing     Heating or AC Issues     Electrical and Wiring     Brake Systems     Car Stereo Repair Advice     General Discussions     Car Making Funny Noises     Engine Fault Codes     Engine Troubles     Exhaust Systems     Steering and Suspension     Transmission Troubles     Tricks of the Trade Automotive World     General Discussions     Antique Car Talk     Car Shows and Events     The Bargin Bin     Motor Vehicle Inspection     Car Care Tips     Traffic Tickets     Gasoline, Motor Oils, Concept Cars and Engines     Auto Insurance, Financing, Leases, Warranties Truck Repair     General Discussions     Truck Engine Repair     Truck Suspension Repair Motorcycle Repair     General Discussions     Motorcycle Engine Repair CarJunky     Open Posting     Board FAQ's     New Board Suggestions

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