thank you for your suggestions. I don't know how the tach gets its signal and haven't had time to contact Detlev to check. The fires in Northern California have kept me busy. It has also been suggested that there is a resistor in the instrument cluster that could explain the tach and the temp red flashing light symptoms also experienced. any thoughts on this? Mike -------------------------------------------- On Mon, 9/14/15, SDF ( aka ;jim lahey' - Scott ) <scottdaniel@turbovans.com> wrote: Subject: Re: bouncing tach To: "Mike Miller" <mwmiller6@ATT.NET>, vanagon@GERRY.VANAGON.COM Date: Monday, September 14, 2015, 1:42 PM since it's a TDI, I would ask what signal is going to the tach .. is it alternator-sourced or is it directly from the ECU ? if the former ...one might look there some. "tdi conversion " is a very good list for this sort of thing. On 9/13/2015 3:27 PM, Mike Miller wrote: Yeah, I forgot. with a van always start with the grounds. Even for a flat tire. -------------------------------------------- On Sat, 9/12/15, Dennis Haynes <d23haynes57@hotmail.com> wrote: Subject: RE: bouncing tach To: "'Mike Miller'" <mwmiller6@ATT.NET>, vanagon@GERRY.VANAGON.COM Date: Saturday, September 12, 2015, 6:05 AM You either have a bad connection somewhere causing false pulses, interference from something, or the tach itself. I would start by looking for wiring issues starting at the chassis, (ground) connections. Dennis -----Original Message----- From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of Mike Miller Sent: Friday, September 11, 2015 8:09 PM To: vanagon@GERRY.VANAGON.COM Subject: bouncing tach Vanners, For the second time the tach in my 87 syncro westfakia converted to TDI went crazy for a while. Bounced up and down and all over then after a few minutes went back to regular. It a diesel dash pod with a diesel tach. It was very hot yesterday but the first time it happened it wasn't hot so….? I have a tech tool hooked up and it shows a steady tach reading. but it's kind of disconcerting.watching the dash board tach go nuts. Any ideas on what goes wrong and how to fix it. Mike |
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