Just another possibility. I had a similar problem once. Tried everything without much success. Turns out that I had replaced the AFM with a rebuilt AFM a while ago, van ran fine until the valve on the rebuilt one got stuck open half way. After I fixed it, all was well again. Alfred 85 Westy ----- Original Message ----- From: "BJ Feddish" <bfeddish@NETREACH.NET> To: <vanagon@GERRY.VANAGON.COM> Sent: Wednesday, March 05, 2008 2:40 PM Subject: Still running like crap, the saga continues
> OK, awhile back I posted about my van hesitating. If you remember I took > it > to my mechanic who cranked the AFM screw to get it to run rich. The > hesitating went away, the van ran pretty good but I was down to 11 MPG. I > took it back, he cranked it back the other way, still ran OK but now we > had > more hesitation. This type of hesitation was where there was a power loss > for a few seconds then the engine went back to normal. I thought I could > deal with this until spring but then it started stalling at lights and my > mileage was still crap. I decided to take it to a well known shop about 45 > NE of me. They fixed my ground wires, replaced the O2 wire and set my > timing, idle and C02 to factory specs. After a vacuum check everything > looked fine except a slight leak at the throttle body. I thought I was > going to be getting a great running van back but that was not the case. > Low > speed is worse than it's ever been. It's almost as if there was a tennis > ball under the gas pedal. If I'm trying to accelerate in 2nd gear there > just > seems to be no power. There are no "big" hesitations but now I have allot > of > little ones like someone was tapping on a switch. The low power at low > speeds is frightening. The van idles fine now and traveling at high > speeds > seems to be slightly better than before this latest change. I'd like to > call them back and see what else we can do but I'm kind of upset they let > me > drive the van out of the shop in that condition. Anyway, can this small > vacuum leak in the throttle body be the cause or is there something else I > should be looking at? Is it time to just start replacing parts? > > BTW, I just check the timing and it was dead on the V mark. > > Also, nobody has been able to find the "thump-thump-thump" noise emanating > from the rear. 2 places think it "could" be the axel. I can't wait for the > tow truck ride to discover what that is.... > > Thanks, > Bryan |
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