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Originally Posted by 2madrns
I have a 96 Astro. Sometimes when I come to a stop and keep my foot on the brake, I get a Clunking noise. One single Clunk. Sometimes it freaks me out and I look behind me to see if I was rear ended by a vechicle. Also notice that the van engine revs and the van tries to surge forward. I have had it in the shop 3 times. No one seems to know what it is. I U-Joints are in perfect shap with no play in them. Anyone have any ideas.
Tom  |
Sounds like your idle is too high, and this causes your transmission, which is also computer-controlled, to downshift at the wrong speed. Your idle is controlled by the Idle Air Control valve (IAC), and this is monitored by your computer...if your IAC is acting up, you should be seeing your check engine light coming on, especially at idle. If not, there was a dealer memo regarding some driveshaft problems, in some cases, the driveshaft yokes had to have grease injected into them to prevent clunking on acceleration and deceleration.