Lack of power/unpredictable power

[green536@hotmail.com (Chris DeLong)]

air flow meter



Chris DeLong
Fine Tuning
206.367.5503
Seattle, WA USA





>From: "Bill Collins" <photo@intrex.net>
>Reply-To: <photo@intrex.net>
>To: <scirocco-l@scirocco.org>
>Subject: Lack of power/unpredictable power
>Date: Wed, 16 Apr 2003 09:31:12 -0400
>
>I'm having an interesting problem with my '90 Cabriolet (8v 2H engine with 
>Digifant).  Here's some background:
>
>Recently I changed the timing belt and valve stem seals.  After this the 
>car behaved strangely.  Sometimes it would run fine, other times it would 
>accelerate normally up to about 4500 RPM, hit a "flat spot" until about 
>5500, then rev happily to redline.  At other times, the acceleration would 
>be weak and uneven (almost like I was keeping time to the radio with my 
>right foot)  On a few occasions, I could hardly keep the car moving. 
>Sometimes it seems to accelerate a bit just as I let off the gas.
>
>Here's what I have done to try to fix it:
>- Rechecked ignition and cam timing
>- Replaced the air intake boot (to fix a significant hole)
>- Looked for other vacuum leaks
>- Checked all the ground wires and vacuum lines that were disturbed in 
>doing the work on the car
>
>BTW, its quite a bit better after fixing the hole in the intake.
>
>My instincts tell me that its a fuel mixture problem of some sort. 
>(possibly a lean mixture causing pinging which causes the digifant to 
>retard the timing, although I don't hear any pinging)
>
>Here's what I plan to do this weekend:
>
>- Look for vacuum leaks again
>- Disconnect the O2 sensor
>- If it still runs bad with the O2 sensor disconnected, use the O2 sensor 
>and voltmeter to monitor the mixture while driving.
>- Compression test
>
>Any other ideas?
>
>Bill
>
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