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Old 08-12-2012, 09:51 PM   #3
not this alero
AleroB888's Avatar
AKA: Greg
Join Date: Nov 2005
Location: Fort Knox area, KY
Age: 69
Posts: 1,300
Vehicle: 1999 Alero V6
AleroB888 Gettin' there
Originally Posted by Christoph View Post
My automatic transmission was clunking into Reverse and Drive. I had 2 mounts replaced at the dealer as well as new tranny fluid. 1 mount was on the rear of the engine and the other one I can't remember where exactly. The clunk from Park into Reverse is gone, but the clunk from anything into Drive still exists. It isn't as harsh as before the mounts were replaced, but it's still a significant clunk. Also I had the dealer put in new tranny fluid because the shifts 1 to 2, etc. were a bit hard. Those have since died down quite a bit.

I just got in from cleaning the MAF and installing a new air filter. I read that dirty MAFs could cause this, but the clunk into Drive is still there. Should I have disconnected the battery while cleaning the MAF? The weird thing though is ever since the new mounts the clunk into Drive is almost always there, but not always. Sometimes it's smooth, but a majority of the time it clunks into Drive.

Any ideas on what I should check next?
Could be a high resistance or open circuit, pressure control solenoid to the PCM, which should set a code but not the SES light. Sometimes faulty TPS or IAT, but the dealer should have scanned for all that.
1999 GLS MP90 supercharged / 2003 GL MP62 supercharged / 2004 GLS stock
Magnuson MP90 / TOG's / 3 in. Magnaflow exhaust / MSD ignition / LS1 MAF / Racetronix pump / HP Tuners / TCE 68mm TB / 36 lb Inj
= Best track time: 12.951 @ 104.48, 1.839 60 ft. (Beech Bend Raceway Park, 11-23-13), 50 Deg. F
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