----------
> I have an 89 405 Mi16 which has developed some sort of running problem.
>
> Upon cold start, the engine would start on the 1st or 2nd try, but miss and
> such for 20 seconds or so, then surge to 2000rpm and fall back down to
> 1200.....idling "smooth" by what the tach said, but the exhaust note told a
> story of slight missing.
>
> When you first pulled away, the car had no power, and for the first 100ft,
> would hesitate and bog....almost like there was a lack of fuel. Then it was
> fine.
>
> But over the past week or so......it would take 4 or 5 tries to
> start....each time the car would "start" instantly, then die immediatly. I
> could speed this process up by priming the gas pedal. (yes..like in a
> carburated car.)
> And...when the car finally did start, and was idling terribly, a little jab
> on the gas pedal would clear it up for 5 seconds or so.
>
> It is fairly smooth running at constant speed.....but when you abruptly
> change throttle..like floor it or something....it will hesitate a
> little.....almost like it is bogging down or something.
>
> If I can at a light, and floor it from a stop...I get surging all the way to
> redline.....One of out 5 or 8 tries will the car feel like it has full
> power, I will think the problem is solved, but to know avail.
>
> To try and solve this problem, I have installed a new air filter, new plugs,
> new cap and rotor, new fuel filter, and run a bottle of Techron
> through.....nothing has helped.
>
> I was thinking of getting new spark plug wires.....as well..but that is not
> what I think this problem is.
>
> This sounds fuel pumpish to me? Anyone else concur? Anything else? I
> have looked through the archives looking for this problem...I have seen
> someone cleaning out the emissions equipment, someone else fixing a vacuum
> leak. But I wouldnt think the vacuum leak would hurt anything at high rpm.
> This problem is all the way through the power band.
>
> Thanks in advance!
> Brian
> Seattle, WA
>
>
>
> Brian J White
> bwhite@thepoint.net
>
>
>
>
>