High rpm misfire when cold outside
Plugs are about 15k miles old, coils are BHR w/ 30k miles on them. When it's cold out I get a hesitation/misfire/sputter over 7,000rpm. It's fine when it's warm out though.... Ideas on what it could be? Just checked all my wires to make sure they're snug and none were loose.
|
Check your fuel trims via OBD. Possible something is messing with your fuel and air delivery, and cold air males it just bas enough to misfire. What kind of cold and what kind of warm are we talking about?
|
Originally Posted by Loki
(Post 4854322)
Check your fuel trims via OBD. Possible something is messing with your fuel and air delivery, and cold air males it just bas enough to misfire. What kind of cold and what kind of warm are we talking about?
|
Presumably you're waiting for it to warm up before driving it hard...
Check your IAT. It's possible that the sensor (it's inside the MAF) is malfunctioning but only showing up at low temperatures. |
Originally Posted by NotAPreppie
(Post 4854334)
Presumably you're waiting for it to warm up before driving it hard...
Check your IAT. It's possible that the sensor (it's inside the MAF) is malfunctioning but only showing up at low temperatures. |
Yah, you'll need a scanner. Elm327 bluetooth adapters are cheap and you can use an app on your phone.
|
Originally Posted by NotAPreppie
(Post 4854350)
Yah, you'll need a scanner. Elm327 bluetooth adapters are cheap and you can use an app on your phone.
|
I'm having this same issue. No problems when it is warm outside, but if it is under 32 degrees then it'll misfire around 8.5k rpms. It may just take the engine longer than usual to completely warm up. I just cleaned my MAF, hopefully thats the fix. Im moving down south soon, so im not too worried about it.
Brand new sparks/coils/plugs (BHR) 80k miles on the car. |
You should try to keep the RPMs under 5-6k until the temp gauge is just left of center. It's not recommended to redline rotary's or any engine for that matter until they reach operating temp.
If it only does it when cold, I wouldn't worry to much about it. There are numerous possibilities for the cause of a misfire. If you really want to dig into it, gather some engine data. Fuel trims, MAF, 02 sensor readings ect... Without these everything is just a shot in the dark.... David |
I appreciate the response. I know to let the engine warm up before driving it high rpm ever. When I did it the other day I had already been driving for 20 minutes and the gauges all looked right. I’m going to take your advice and get some fuel trims. |
All times are GMT -5. The time now is 04:17 PM. |
© 2024 MH Sub I, LLC dba Internet Brands