Starts fine but runs rough for about two miles then runs fine. Does not help to let the engine warm up before driving, but driving does.
Could be your temperature sensor or a vacuum leak somewhere.
SOURCE: mercedes 190e 2.6 auto,starts fine
MAY REQUIRER THROTTLE BODY CLEAN UP,OR FUEL CLEANER IN THE SYSTEM...
SOURCE: Car hesitates/stalls when engine is warm and car starts to move.
Sounds like a bad motor mount, pop the hood and see if the motor shakes or moves rapidly when u put it in gear holding down the brake.
SOURCE: rough idle after warm up
I'd take a look at the temp sender...the engines computer may be
"thinking" the engine is still cold when it's not. That would cause it
run rich (and rough) after it's warmed up. Generally the sender can be
tested with an ordinary volt/ohmeter but you will need the
specifications available in most inexpensive manuals. As with any
complicated electronics system, I can only give you my best guess,
without the luxury of doing any hands-on testing myself.
Good Luck!!
SOURCE: 2006 cobalt 2.2 engine, when
You replaced the spar4kplugs but how about the plug boots, these boots are like sparkplug wires and they short out sometimes , with over 100,000 miles i would replace them, also you may have a bad coil . the coil is a complete unit its 4coils in one and may be misfiring, the other problem maybe a dirty throtlebody or bad idle air control valve, you said it runs rough at idle, i would first take it to have the computer scanned to see if there are any stored codes, the computer is always yesting all systems and when it sees a problem it stores a code, this code will tell you what is failing, many autopart stores will scan it at no charge, also if it sees the problem a certain about of times it will turn on the engine light, if you get it scanned and give me the codes i will be able to help you further. for example they may scan it and get a code that reads po302- cyl 2 misfire. this means cylinder 2 is misfiring and then you need to see why its misfiring, it may be due to a plugboot or coil or injector. i would scan it first. hope this helps. good luck.
Testimonial: "i will put boots on. amsoil fuel system cleaner seems to be helping also. thanks for your help"
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