Cold start issues (making donuts at the exhaust mufflers).
12-29-2016, 12:16 AM
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Cold start issues (making donuts at the exhaust mufflers).
Hello guys. I am writing this post as I have a big favor to ask of you.
Whenever I start the engine in the morning (very cold weather recently), my 2005 RX8 (8,500miles) has irregular emissions and even make donuts at the exhaust muffler (plz see the attached video clips). Now CEL is on (error code: P0301-rotor 1 misfire). But after warming up, idling and exhausting become RELATIVELY stable (still making donuts at the muffler).
I’ve replaced wires, coils, plugs, air filter and even cleaned the MAF sensor. But there is still same issue. FYI, I got the engine compression test two months ago and the result was pretty good (rotor 1 7.1-7.2-7.1 / rotor 2 7.8-7.9-7.8). I have no idea what I should do &( (after driving my RX8 in the US for 6 years, I’ve taken my car to Korea a few months ago. There are no official dealer shops here.).
I plan to replace injectors, crank sensors, and O2 sensor soon, but I need your advice plz!
Whenever I start the engine in the morning (very cold weather recently), my 2005 RX8 (8,500miles) has irregular emissions and even make donuts at the exhaust muffler (plz see the attached video clips). Now CEL is on (error code: P0301-rotor 1 misfire). But after warming up, idling and exhausting become RELATIVELY stable (still making donuts at the muffler).
I’ve replaced wires, coils, plugs, air filter and even cleaned the MAF sensor. But there is still same issue. FYI, I got the engine compression test two months ago and the result was pretty good (rotor 1 7.1-7.2-7.1 / rotor 2 7.8-7.9-7.8). I have no idea what I should do &( (after driving my RX8 in the US for 6 years, I’ve taken my car to Korea a few months ago. There are no official dealer shops here.).
I plan to replace injectors, crank sensors, and O2 sensor soon, but I need your advice plz!
Last edited by waterdog; 12-29-2016 at 12:18 AM.
12-29-2016, 11:09 AM
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I had white smoke while my water seal was on the way out, and the exhaust didn't smell sweet at all. If it does smell sweet it's definitely coolant, but at least in the case of my car, it can still be coolant if it doesn't smell sweet.
Coolant level is stable. Nothing changed.
12-31-2016, 01:52 AM
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Thank you so much for your comments! I will definitely check my water seal!
12-31-2016, 01:56 AM
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12-31-2016, 06:39 AM
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If you have a water seal that's breaking down, you'll need a rebuild soon. But if your coolant level is stable, you probably don't have a problem with the water seals.