Quote:
Originally Posted by reg.morris
SV650S K4.
Had the bike de-restricted in a dealers after 2 years. Was running good before.
All well until the mechanic connected the air pressure sensor to the throttle body vacuum. Then back cylinder started popping and banging and stayed that way even when vacuum was disconnected from sensor. No F1 fault comes up unless sensor is disconnected. Over 12 hours of testing, including full Suzuki diagnostics have not identified problem. Have tried new sensor, complete new throttle body assemblies, and new EMS box. Fault persists. Mechanic says fault is 'impossible' and should affect both cylinders if not in EMS or throttle bodies. The only thing left is to try replacing the whole wiring loom (expensive!). The mechanic has diconnected the sensor and crimped off the vacuuum pipe and the bike seems to run well.
|
Since this tread seems to be dead, I went to the SVRider website where there was a thread about a bike that would run only with the IAP disconnected. Like mine.
To cut a long stort short the dealer had also adjusted my bike's valve timings when it went in to be de-restricted. It seems they managed to put the cams in the front cylinder back 360 degrees out. The bike ran fine, but the IAP detects intake stroke in the front cylinder and the EMC uses this information for the spark (this was now 360 degrees out relative to the rear cylinder). This caused the ignition sequence to be 360 degrees out and killed the rear cylinder. See thread below for the whole story.
http://www.svrider.com/forum/showthread.php?t=127683