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IMPORTANT: enter the case-INsensitive alphabetic (no numbers) code AND WRITE SOME SHORT summary of changes (below) if you are saving changes. (not required for previewing changes). Wiki-spamming is not tolerated, will be removed, so it does NOT even show up in history. Spammers go away now. Visit Preferences to set your user name Summary of change: USB to rs232 problems Car 1 Made a rally BMW 325 install. When making the set up I had no problems but suddenly when driving Vt louse connection and says “unplug usb adapter” Usb adapter is type http://apple.clickandbuild.com/cnb/shop/ftdichip?productID=160&op=catalogue-product_info-null&prodCategoryID=84 Driver is updated to the lasted one http://www.ftdichip.com/Drivers/CDM/CDM20814_WHQL_Certified.zip Using Win Xp Vt 2011-03-11 Firmware 1.1.81 Wiring harness typ vems 6 cyl. The installation is made like this http://www.vems.hu/manual/vemstune/help2/htmls/main/preferences/ecu_comm_dialog.html Car 2 Consumer installation BMW 325 turbo. They has the same problems and we tried to help but nothing will fix the serial problem. Frimware 1.1.88 Vt 2011-04-26 Win xp ftdi driver http://www.ftdichip.com/Drivers/CDM/CDM20814_Setup.exe Can I change settings in Vt or will it help (timeout, ignored error, write delay) It will be helpful if someone could help out on this one Thanks Peter Regarding settings in vemstune, as long as write delay is >25 and timeout is 100 it is not related to that. It is most likely related to ignition noise, broken spark plug, distributor or plug wires. * check spark plug wires * check spark plugs * check coil(s) ** Distributor cap, rotor etc.. ** if coil on plug, check that all the rubber boots are in good condition and clean of dirt, oil or water. * Use a serial cable extension between usb adapter and ECU (This helped in some occations) * If using a in car 12V notebook charger, try to unplug, ground can go through the usb instead of the cig plug if the socket is bad. //Emil Optional: Add document to category: Wiki formatting: * is Bullet list ** Bullet list subentry ... '''Bold''', ---- is horizontal ruler, <code> preformatted text... </code> See wiki editing HELP for tables and other formatting tips and tricks.