I have a 2006 Honda Accord with 71000mi.
The issue: It seems to lurch when driving on the highway (like its cutting out or slipping and then catching) but only when its very cold out (low 20's or below and seems to get worse the colder it gets). It may lurch 3 times in 10 seconds and drive fine for 1 minute. It doesn't go away when the car warms up (drove it for over an hour today) and doesn't occur at all in warmer weather. I noticed it a few times last winter, but it went away as the weather was warmed. I checked the transmission fluid and its not low the check engine light does not come on so I'm leary that a full diagnostic check at the dealer will identify anything. Looking for some possible options that I can try before heading to the dealer$$$ for help.
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code p0320 refers to cam shaft position (CKP) sensor/engine speed (RPM) sensor--circuit malfunction=== causes --wiring--CKP/RPM sensor ---ECM
because the engine runs ok until it is on cruise control I would be investigating the RPM sensor for a fault
The cruise control takes its control from the RPM sensor and if that circuit is interminable the the cruise control doesn't know what rpms to maintain.
If you have been to three shops,I'll assume that all the basics have been covered. Did anyone check computer stored codes? What did they see? If you are going to try to fix it yourself, you will need to get a manual and check each and every component, one by one. Also, outside of the realm of computer stuff, check converter to make sure its not partially plugged. At low rpm city driving it may be flowing just enough to get by on. Also check that fuel is clean and has no water in it.
There are two likely possibilities: 1) Old/cracked Ignition system (spark) is being shorted out by water/humidity, 2) Carburetor icing.
1) This test is more effective if done at nighttime or in a darkened garage, as any spark arcing will be visible. Start the engine and let it idle. Use a spray bottle with water and mist your spark plugs, wires, distributor cap, and ignition coil with water. If you see spark arcing or the engine starts to run rough or stall, there's your problem, replace the ignition component(s) involved.
2) If your problem only occurs during cold moist rainy weather (ie. 45 degrees or below), especially if it only happens during highway driving, you could have carburetor icing. There is a hose that runs from the exhaust manifold shield to the underside of the air cleaner housing. In colder weather a valve will draw heated air from around the exhaust manifold through this hose into the air cleaner to prevent icing. Either this hose is missing/disconnected or this valve is not working correctly.
I'd say for you to replace the fuel filter. It should only cost $20. I'm about to do that right now because I'm having similar problems. I've had that problem on my previous car and it went away after I replaced the fuel filter.