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RE: Check Engine Light
Posted by Sid Jacobson (more from Sid Jacobson) on Fri, 28 Jan 2000 09:58:37
In Reply to: Check Engine Light, Damon Rogers, Tue, 25 Jan 2000 10:50:50 
Assuming operation's similar to earlier 900's, dealer explanation 
incorrect.

Yes, if power to the ECU interupted, the check engine light comes on and 
the ECU needs to be 'retrained'.  Retraining consists of driving the 
vehicle for 10+ minutes with engine at normal operating temps.  Have also 
seen info which indicates that the vehicle should be driven at 3,000+ rpm 
but my computer general clears and resets after 10mins of normal driving. 
 If however there is a persistant fault i the system the check engine light 
will stay lit until the problem corrected and/or the code is cleared.

My experience is that 9 times out of 10 vacuum hose has come loose.  Open 
the hood and listen for hissing while moving rubber vacuum hoses around. 
 Typical points of disconnection are the PCV valve on top of the cam cover 
and  connections to the throttle.  body.  There's a diagram of vacuum hose 
routing around the wheel well.  Good luck.
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