Lifter noise alone is not a sign of miss adjustment, just a lazy lifter. Adjustment won't fix it. The front two cylinders having lower compression can be an indication of a problem including worn camshaft lobes. A 20 pound difference can be an indication of something amiss. 120 is a wear limit. Do you have an air compressor? Get an economy leak down tester like http://www.amazon.com/Milton-S1257-Cylinder-Leakage-Tester/dp/B000K1FLHG After you get a reading you can bypass the gauge and put full pressure into each cylinder and find out where it is leaking through. Dennis
-----Original Message----- From: neil n [mailto:musomuso@gmail.com] Sent: Saturday, July 28, 2012 3:37 AM To: Dennis Haynes Cc: vanagon@gerry.vanagon.com Subject: Re: Fuel Injector (or wiring) Question: Deceleration, Fuel Shutoff Mode Huh. Ok. I thought that minimum of 120 PSI was good. Looking again at the bill, mechanic wrote: 130 120 140 140
Though this may not be indicated in the above figures, given the brief lifter noise at start up, I have to wonder if the valves are adjusted correctly (initial adjustment) on the p-side head. The p-side head is an AMC. I assume a PO had a new head installed at one point. Neil.
On Fri, Jul 27, 2012 at 10:43 PM, Dennis Haynes <d23haynes57@hotmail.com> wrote:
> Unless your battery-starter cranks very slow or you compression gauge > is off > 120 is not good compression for a water boxer. Time for a leak down > test and measure valve lift. Bad valves/guides can cause all sorts of funky stuff. > Except for the O2 sensor system being difficult to diagnose the rest > of the FI system usually works or it doesn't. It is often blamed for > something else being wrong. > > Dennis > > > -----Original Message----- > From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On > Behalf Of neil n > Sent: Saturday, July 28, 2012 12:54 AM > To: vanagon@GERRY.VANAGON.COM > Subject: Re: Fuel Injector (or wiring) Question: Deceleration, Fuel > Shutoff Mode > > the issues are a surge decelerating from 2500 and surge accelerating > from lower rpm. > > compression ranges from 120 - 140 so that's good. engine power is good.
-- Neil n 65 kb image Myford Ready For Assembly http://tinyurl.com/64sx4rp '88 Slate Blue Westy to be named. '81 VanaJetta 2.0 "Jaco" http://tubaneil.googlepages.com/ Vanagon VAG Gas I4/VR Swap Google Group: http://groups.google.com/group/vanagons-with-vw-inline-4-cylinder-gas-engine s |
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