markcunningham

Good brand outside of a Bosch oem. Sent from my iPhone using Tapatalk Pro

Look in the rectifier assembly! There should six diodes In there. Sounds to me like your rectifier is not doing its job transferring a/c volts to d/c volts which is your output. Sent from my iPhone using Tapatalk Pro

Check diodes, they are the first usually to go, then the regulator. Sent from my iPhone using Tapatalk Pro

Ouch! Sent from my iPhone using Tapatalk Pro

Over engineered! Lol! Sent from my iPhone using Tapatalk Pro

Wow, amazing how vw’s are so sensitive. Sent from my iPhone using Tapatalk Pro

Mine didn’t show any MAF issues in vagcom either however it ended up being the MAF in my case. On these older OBD1 ECUs rosstech doesn’t. Pick up a lot. Sent from my iPhone using Tapatalk Pro

So be it! But at least check that it’s working properly because it’s like chasing a ghost! Sent from my iPhone using Tapatalk Pro

Reconnect PCV! Important part! If no change after unplugging MAF or It runs better it’s the MAF. The MAF tells the ECU about your air intake, then the TPS tells the ECU what your rpms are. Sent from my iPhone using Tapatalk Pro

As far as the 02 goes if all else is good then your checking for voltage reference which is 0.10 0.90v or 1.0v Sent from my iPhone using Tapatalk Pro

Had this issue for a while and thought it was something else. New MAF fixed my hesitation and erratic idle. If your idle stays low but idles good you have to adjust the idle stop on the TB. My guess is vacuum leak somewhere and or ISV. You can take the ISV off and clean it out with carb cleaner. Sent from my iPhone using Tapatalk Pro

Check your MAF first because if the 02 is sensing low oxygen which is a rich condition hence the reason you have grey ish smoke then you want to check other issues first. MAF first. Pull MAF connector and no change your MAF is on the fritz. Sent from my iPhone using Tapatalk Pro

Check for vacuum leaks. Let me look into procedure for 02. Sent from my iPhone using Tapatalk Pro

Check your MAF and 02 sensor. Pull MAF connector and it runs better it’s your MAF. I’m running the same engine in my daily 95 Passat! Google 02 test Sent from my iPhone using Tapatalk Pro

The pictures I’ll post will shed light on the subject. If you have yard close by just go take the handles from any Mk1-2-3 Sent from my iPhone using Tapatalk Pro