MB (27th June 2019)
Very fair question mate, keen to learn also!
Assuming the ignition is offski should in my nuffy theory be fine, although I did nearly set a 1961 model 6v VW beetle alight installing a fully sic FM/AM radio headset.
If in doubt, and or welding aboard, disconnect has always been my safe go to for the added extra 2 minutes work !
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Whoops, wrong answer again :-)
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MAF sensor clean. Am I doing it wrong, always only just unplug elec connector, remove sensor, give it a squirt, let it dry and then just put it back in / connect and go. No problems to my knowledge.
2008 GU WAG ST Manual CRD - To do the job
MB (28th June 2019)
ECU's are constantly learning and adjusting some engine sensor and operating conditions but it isn't an instantaneous process more a running average sort of deal.
If you disco the battery for 30 minutes it forces the ECU to immediately start to go thru a relearn process for adjusting individual engine parameters starting from factory or default ECU settings.
IE the ECU starts from factory trim and ends up at its new trim
If you don't disco the battery and only unplug and clean the MAF then the ECU maintains its existing trim settings and adjusts its trim starting from that point rather than default.
IE the ECU starts from the prev trim and ends at its new trim
FWIW I never bothered forcing a relearn unless I changed the MAF or the MAF was filthy and/or threw codes prior to cleaning as IMHO a relatively clean and functioning MAF won't affect ECU trim all that much after a clean so trim is probably closer to existing than defult.
Unless you are operating in really grotty environments or getting a lot of Turbo Surge blowing oil film back over the MAF a clean every 30 to 40 thousand K's or so is more than adequate for a normally functioning engine and IMHO the ECU doesn't need a forced relearn
Last edited by the evil twin; 28th June 2019 at 12:09 PM.
Dolphins are so smart that within a few weeks of captivity, they can train people to stand on the very edge of the pool and throw them fish.
Bidja (28th June 2019)
Far bit of road dust around home, guess do maintain air filtration thru life though. Probably has paid off in line with your comment. First 80 thou ks did not go near MAF but have clean every 10 thou ks since (all up 160 thou ks since new veh).
Then again have had the battery out many times for mods..hahaha
Last edited by Bidja; 28th June 2019 at 12:59 PM. Reason: battery out many times
2008 GU WAG ST Manual CRD - To do the job
So went to test my maf today and mine does not match any listed here. I have a 6 pin plug with 5 wires. It has nothing in the first pin and then its white, yellow with blue line, yellow with blue line, pink, black. Any ideas on how to test this?? 07 crd auto