I have the EXACT same symptoms that you describe...always at 2900 rpm on my '85 manual. It runs fine above and below this RPM, but when you get it there...oh boy! I have borrowed/tried a number of other parts. AFM and AFM cleaning, temp 2 sender, O2 sensor, cap&rotor, distributor, plugs, plug wires, all grounds cleaned, and it still persists. I don't want to replace all parts. It was needing the ignition stuff replaced so I didn't feel had doing that, but I don't want to start buying everything blindly. Mine mainly does it in the fall, winter and spring when the temperature is cool or cold. It is temperature sensitive (both the temp of the van and ambient temp). In the summertime, it only lurches occasionally. In the winter is does it mostly when warmed up and in the summer it will only do it on a cool morning before it warms up. It has nothing to do with speed since I can increase the idle while in neutral and the engine cuts out at 2900. I had quite a few suggestions and couldn't figure it out. I'm positive that it didn't have to do with the gas because this was a daily driver at the time and it had fresh gas. It just started doing this one day and hasn't stopped since. Summer is the only time that it is mostly driveable. Here's my previous post... History ---------- Last winter, my vanagon developed a severe "hiccup" when I was cruising at 2900 RPM. It doesn't do it all the time, but it does it a lot now that it's not summer. During the summer it is not nearly as bad, but it still will do iton occasion. What happens is when the tachometer is passing 2900 RPM it will give a terrible sounding and feeling lurch. If I'm accelerating hard, it will usually just do it once assuming I pass through 2900 RPM quickly. • If I'm trying to cruise at 2900 RPM (any gear) it will continue lurching. • It doesn't occur at any other engine speeds. On Wednesday, April 30, 2003, at 09:00 PM, Automatic digest processor wrote: > Re: Stuttering at 3000 rpm > Okay, here's the deal. I've got a 1985 Westy, automatic. She's > running > well until yesterday when all of a sudden on the freeway she develops a > stutter at 2800-3000 rpm (about 45-48 mph in drive). Below it okay; > over > it okay. Only does it when engine warm; cold okay. Starts fine, > too. I've got a new AFM, 02 sensor, new-used ECM. > > Extra info: It had been sitting for the winter. This was the first > time > out. I put a thing of NAPA injector cleaner in the tank. After about > a > three-fourths of a tank I stopped for more gas, thought I'd better add > another can, this time of Gum-Out injector cleaner. The stuttering > started > about fifteen miles down the road after that. Just chance or > significant? Since then I've run most of the gas through, but the > stuttering continues. |
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