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Chevrolet Malibu, Chevrolet Malibu Maxx, Electrical, Engine, Sedan
Jul 12, 2004 (1:10 am)
If the oxygen sensors in the exhaust system indicate that the engine is burning too much or too little fuel for correct combustion, the computer will attempt to provide the correct air/fuel mixture by increasing or decreasing (trimming) the amount of fuel it delivers to the engine. That's "fuel trim" and the amount of trim can be read with a scan tool.
Almost all front wheel drive vehicles don't have a transmission. Because the final drive is incorporated into the same cast aluminum housing as the transmission it's properly referred to as a transaxle, the transmission and drive axle in one unit.
Re the noise you mention, this TSB from GM might cover it:
ASI Resolution - Growl or Howl Type Noise From Transmission/Engine Compartment During Light to Moderate Acceleration from a Stop (Replace Drive Link, Drive Sprocket and Driven Sprocket) #04-07-30-021A - (Jul 2, 2004)
2004 Chevrolet Malibu, Malibu Maxx
2004 Oldsmobile Alero
2004 Pontiac Grand Am
Built After January 16, 2004
with 4T45E Automatic Transaxles (RPO MN5) Built Between Julian Date 4016 and 4126 and
3.4L or 3.5L V6 Engine (VINs E, 8 - RPOs LA1, LX9)
This bulletin is being revised to include a repair procedure and parts availability information.
Please discard Corporate Bulletin Number 04-07-30-021 (Section 07-Transmission/Transaxle).
Some customers may comment on a growl or howl type noise during light to moderate acceleration from a stop. This noise is load and engine RPM sensitive and will occur between 1500 RPM to approximately 2300 RPM. The noise is most noticeable in first and second gear. The noise may dissipate prior to the 1-2 shift, but will be noticed again in second gear depending on the load and engine RPM. The pitch of the noise will change during the 1-2 shift.
The noise is due to the new 5/8 inch drive link assembly being at a resonant frequency during certain driving conditions.
Only RPO MN5 transaxles built between Julian date 4016 and 4126 have 5/8 inch drive link assemblies. Refer to Transmission ID and VIN Derivative Location, SI Document ID #760312 for Julian date location information.
Follow the service procedure below to replace the 5/8 inch drive link and sprockets with a 7/8 inch drive link and sprockets
etc, etc, etc.....
#127 of 3823 Reply on idle complaints on 2004 Malibu
Jul 13, 2004 (7:45 am)
There were a couple posts in various other sections on idle complaints on initial start-up, I am putting suggestions here since more appropriate board.
Has anyone done any work underhood on vehicle who might have taken something apart? This is waaay too detailed but here goes:
Initial thought is this sounds like it could be a vacuum leak. A couple of the easier things to look at:
PVC tube to be unplugged from rear valve cover
Leaks in airflow system at either end end of the crosscar duct at throttle body on engine or the mass airflow sensor (by air cleaner).
Final one would be brake booster vacuum check valve but that one is too tricky to look at yourself
Check if this has anything to do with A/C being ON at start-up (do some vehicle starts when you know that the A/C is off and see if any different).
Sometimes the A/C system might have a higher initial load if refrigerant goes into liquid state after car has sat for a while.
Jul 13, 2004 (8:24 am)
I doubt it is the first since so many of us are having the problem at start up. I also know it is not an AC thing since mine is always off at start up. The rought idle definitely is at start up only. I have a little "hitch" when I'm sitting at a light, but not always.
#129 of 3823 idle complaints
Jul 13, 2004 (10:40 am)
I had a small problem with mine..and I simply went under the hood and made sure all hoses where connected..looking at clamps..pushing all hoses firmly down to insure a good connection and seal..and havent experienced any problems since..I start mine normally with the AC running and notice nothing..perhaps I got the one built on Weds instead of Mon or Fri....know this isnt much help..but lift the hood..and check?!?
#130 of 3823 erratic idle on 2000 malibu
Jul 13, 2004 (7:13 am)
Lately the idle on my 2000 malibu (100K kilometers) has been erratic.
When I start it in the morning the idle may go as high as 2500 rpm. The idle may stay at this speed or it will sometimes drop down to the 750 rpm level. If it does not drop, when I stop and re start the engine it may idle at 750 rpm. I have checked for vacuum leaks, cleaned the (IAC) idle air control. I have checked for problem codes but nothing comes up.
Can anyone offer any suggestions as to what the problem is?
#133 of 3823 Temp Gauge Norm?
Jul 20, 2004 (2:19 pm)
I have an '04 Maxx with 1400 miles on it. The temperature guage reads just above half normally, but the other day, idling in traffic, no air on, it read a half a mark under the overheat range. Has anyone else noticed this? Any info appreciated.
#134 of 3823 Re: Temp Gauge Norm? [glennb]
Jul 20, 2004 (5:56 pm)
yes Glen. My Maxx at 1200 miles is doing the same thing. It reads normally at just above the half way point. When I'm in stop and go traffic, it goes up to 3/4 of the way, just below the red zone. I join you in asking for some input from the other Maxx/Bu owners out there.
David: any insight you can share with us??
#135 of 3823 Re: Temp Gauge Norm? [maxx4me]
Jul 20, 2004 (7:02 pm)
would suggest you mention it to the GM Customer service site.
if you havent already signed up. www.mygmlink.com
register your VIN..and send in the emails with the problem..I did and they worked the rear shade issue..probably will not see a immediate re-engineer of them..but if the case file gets big enough...they might...would say the same for the temp gauge...Ive been fortunate and not had the problem...registers right at the halfway mark or a tick above it...all the time...maybe a sensor or guage problem....but at least be persistent...the GM customer service folks were very nice..and chased me down to insure I was a happy customer..worth a shot