Acceleration off idle

[green536@hotmail.com (Chris DeLong)]

I would not suspect your air flow sensor plate. I would suspect the coolant 
temp sensor on the back of the head. Check it with an Ohm meter for correct 
resistance values.


>Lately my roc's performance has taken a turn for the worse.. at least in
>the low rpm department. When I start it up, it always takes a few jabs of
>the starter to get it going, then it just sits around 900 rpm (the idle
>isn't "smooth", but the rpm is relatively constant). When I step on the
>gas it spudders ands drops to 400 or 500 rpm before bouncing back up to 1k.
>
>Basically, the only way I can get it to rev 'up' instead of 'down' is by
>tapping the gas with my foot four or five times until it bounces up to
>1300 rpm or so where I coax it up above 1600 rpm.. Above 1600 the car is
>good as gold.. no complaints whatsoever..
>
>This problem is more pronounced when its cold (and always has been) but
>lately even with the water temp above the 1/2 way mark it is still
>present. This makes it a real pain to stop at intersections and stop
>signs. If I don't want to drop the clutch at 1600 rpm and rocket out of
>the intersection, I have to feather it up from idle until I have enough
>power to get moving. It usually takes at least 5 seconds to start
>accelerating above 5 mph - by then traffic behind me is pissed..
>
>So.. the car is an '87 16v with euro intake cam, new plug wires, bosch
>plugs, new distributor+cap+rotor, relatively new o2 sensor, new clutch,
>fuel enrichment module (which i tried removing), new battery wiring,
>new thermo-time switch, and new fuel+air filters.
>
>I've checked crank to cam timing and it's dead on, and I recently set the
>ignition timing.
>
>Any thoughts on what the problem could be?
>
>I'm going to take a look at the air flow sensor plate.. I'm thinking it
>could be staying 'bottomed out' until a certain vacuum is achieved (ie.
>around 1600 rpm) then breaking loose and moving freely. I'll try cleaning
>and lubing the pivot point(s).
>
>Thanks for any suggestions..
>
>-Toby
>
>--
>'87 16v
>
>
>
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Chris DeLong
ICQ#45030867
Seattle, WA USA
'80 16V 'Rocco ragtop
'91 GLi 2.0 16V
'77 Rabbit 16V
'80 'Vert (parting out!)
'61 17 Window type II
'91 Vanagon
'78 Rabbit
'84 Jetta


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