Questions & Answers for: engine runs rough till warmed

...of mine has an '86 Stanza. He says that when he starts the car, the sensor light comes on, and the engine bucks really bad, until it warms up, then runs just fine. any ideas?? Replace the bad

engine misses and bucks till it warmes up then runs fine EGR valve or system is bad. that is Exhaust Gas Recycling valve. It's a pollution device that recycles exhaust gas back through the engine once

runs fairly well but idle is up and down , trans shift not too smooth. I drove it for 30 mins in traffic an highway speeds. does not overheat . Let it sat over night . had to use the unplug MAF way to

engine code p0170 changed air filter fuel filter plugs and wires with oil change idles rough with code only after full warm up runs fine till temp gauge reach half way hello this is a fuel trim ...

...engine at idle was very rough, changining between 500-650 rpms. Parked the vehicle for several hours then drove it again, ran smooth till engine warmed up then the rough idle began. The check engine ...

...runs better, then the sensor is your problem. a bad coolant sensor adjusts air to fuel mixture, depending on temp. of engine. it will run to rich and not enough of air if bad. it will also run rough ...

...runs fine. Hi The engine temperature sensor is bad. If so, the ECU assumes the engine is warm and it leans out the mixture, but you need a richer mix when cold, so it will run lousy till it actually ...

after sitting all night engine runs rough till it warms up Can you take it to AutoZone for a code check? try cleaning the maf it is a cheap places to start

...the engine it misses and runs rough till it warms up, it then runs fine Run the codes,change spark plugs,clean the MAF sensor and always make sure to replace a fuel filter every 30K miles. ...

...a 91 ford f150, that runs good till warms up then runs rough and floods out First check the fuel pressure while it is running. A bad regulator could cause too much pressure 65+PSI FLOODING THE