2007 Vectra Z18XER
As per title really. Engine threw a random EML whilst accelerating from stationary and really rough idle. P0170-11, no other codes. Read live data and MAF voltage was bouncing about on a steady TP input. Replaced with genuine siemens VDO MAF. Seemed to run perfectly on open and closed loop test.
About 80 miles into next journey same random EML coming off the throttle. P0170-11 and fuelsys1 OL fault and slightly rough idle. Car had an EDS IPF remap last year so a slightly lumpy idle is normal. Even replaced the exhaust cam solenoid for good measure with no effect.
Along with the P0170 was a list of not present faults including MAF, CT TP etc.
O2 pre cat is holding steady voltage and O2 post cat is gently cycling voltage.
I've sprayed carb cleaner around every vac pipe, servo, cam cover, oil filler and dipstick, air intake joints and flexi and can't find a leak anywhere.
Have noticed that exhaust note has got a bit more gruff than normal.
Stumped really, any good ideas before I have to pay someone to smoke test it and tell me less than I already know.
Many thanks
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