PROBLEM: I'm having a hard time trying to figure this one out. Some months ago, I thought I noticed that the engine would seem a little rough and not much power in 5th gear at 2000 rpm. It was so subtle that I figured the engine just didn't like lugging along in that gear at that rpm. Now it has become so bad that the car is almost not drivable. It seems that any gear around 1700 - 2000 rpms will cause the engine to seem like it has water in the gas. The timing sounds retarded and there is no power.
WHAT I"VE DONE SO FAR
I'll post a video and my thoughts later, but thought I would throw this much out there to get the ideas flowing in.
Thanks all.
WHAT I"VE DONE SO FAR
- Adjusted and set the Throttle Position Sensor to .63v (a little on the high side because I occasionally see a TPS Sensor low voltage error pop up once in a while)
- Adjusted cable to change the throttle response from 0 - 95% to 0 - 100%
- Adjusted the IAC adjustment screw to get idle down near the 976 rpm and the IAC position to between 20 - 40 (but the IAC is a continually moving target)
- Checked the spark plugs and found a lot of carbon on them (none appeared to be running too hot)
- Removed the air filter to see if that had any affect (nope, it didn't) My thought was that maybe it wasn't getting enough air because the issue is at low idle when there is no boost
- Reset the IAC to factory defaults
- Verified that the cams were still aligned (no apparent belt slippage)
I'll post a video and my thoughts later, but thought I would throw this much out there to get the ideas flowing in.
Thanks all.