Thanks everyone for the suggestions. The engine was covered with a layer of windblown snow when I opened the hatch: https://photos.app.goo.gl/PVZnD0hrPiisjhWH2 I checked the TPS, it was good, and measured the voltage from the OXS as 0.43V with the key on. Reseated the TPS and AFM connectors. Got a bottle of Iso-Heet and poured it into the gas tank. I've driven about 5 miles with no incidents of hesitation. Water in the gas sound plausible, the trouble started immediately after fueling up in Missoula. Keeping fingers crossed, heading into Yellowstone Park tomorrow. -Mark
On Sat, Dec 23, 2017 at 8:45 AM, Mark McCulley <mark.mcculley@gmail.com> wrote: > I'm on a road trip for the holidays, van has been mostly running great but > have had some intermittent episodes of roughness. Hoping to get some > suggestions for things to check when I have an opportunity to do so (single > digit temps today, no garage). > > First noticed on beginning of second day, leaving Missoula, just a couple > of hesitations when accelerating onto the freeway on ramp. As long as I was > holding at steady cruising speed, very smooth but if I let off the gas for > any reason, then hesitations again. > > I noticed the symptons again yesterday, this time mostly when changing > gears. Smells like it's running rich. Come to think of it I noticed that > smell a few weeks before setting out, well before I noticed any > hesitations. > > - The first thing that comes to mind is the TPS, I will check that. > - I have spare distributor cap and rotor, but only 7K miles on the > existing ones. > - I have spare plugs, 17K on the existing ones (W7DTC). Inspected 7K > miles ago and looked fine. > - I have the AFM harness with the capacitor, and have never had a problem > with Vanagon syndrome. > > It probably wouldn't hurt to change all those ignition components... > > I'm a bit suspicious of the O2 sensor, is there an easy way to confirm if > it's OK? What does ECU do when O2 sensor is unplugged? > > Thanks in advance for any suggestions. > > -Mark > 87 syncro Westy > |
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