Your PCV system routes blow-by gases back into the intake. It only works correctly with a closed and properly sealed system. ----- Original Message ----- From: "Don Hanson" <dhanson928@GMAIL.COM> To: <vanagon@GERRY.VANAGON.COM> Sent: Friday, July 24, 2009 11:50 AM Subject: No Oil filler cap=poor idle..observation on Digifant..
> My van has an inline four VW motor..Digifant II injection, lots of the > same parts as a WBX. So yesterday I was changing the oil (to 20-50 dino) > without changing the filter...I do that every second change..3000 mi (+/-) > intervals. I was distracted during my refilling and somehow I spaced-out > replacing the cap on the filler. Started it up and had a really poor > idle...very similar to what was going on just before I replaced my Idle > control valve (about 4000mi ago) I was puzzeled, thinking "Jeeze, feels > like some connector has come loose"..but I wasn't even inside the engine > compartment and it happened suddenly without any hints before the oil > change. Then, standing behind the van scratching my head, I noticed my > licence plate a bit askew and found my oil filler cap wedged in there > rather > than on the filler pipe. Put it back on and re-started...in about 10 > seconds, the idele returned to normal... > > So, there must be some kind of vacuum supply that's dependent on a sealed > sump, right? Anyone want to try to explain why leaving the oil filler cap > off might cause the engine idle to go all wierd...kinda felt full rich.. > though it was so windy in my Gorge driveway that I couldn't see any dark > exhaust or smell anything.. > > Don Hanson > > __________ Information from ESET NOD32 Antivirus, version of virus > signature database 4274 (20090724) __________ > > The message was checked by ESET NOD32 Antivirus. > > http://www.eset.com > > > |
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