idle drop

I dont know if my tb has done it before but i havent noticed it

anyways its a 02 2wd short base with 62k miles

i was making a sharp left turn into a parking spot late last night about 3-4am, and when the wheel was cranked all the way to the left the idle dipped to like 100-200rpms, i know that the power steering will do that a little if you hold it but i didnt hold it .

A problem or just because i cranked it all the way and power steering was working to hard

I've got the same issue, but its happened on other cars I've owned so I ignore it...

I've had that happen to me maybe 3 or 4 times in my TB. It almost seems like it's going to shut off. :duh: I have no idea what causes it though...

i figured it was something that happens on most vehicles i recall it happening on some of my other vehicles, well except my 02 silverado i miss that truck.
anyways besides the noisy tach motor the tb has been good

or if your car is in park and you tap the gas, the gauge will dip down a few hundred RPM before going up, and you will lose some volts

I think it may be your battery not letting enough power to subsidize the power drain using the power steering. You engine at the moment couldn't get enough juice to rev as usual. Check to see if your battery is in good shape...and your alternator.

what i described happened to every TB and envoy that i've ever been in... roughly 8-10

I think it may be your battery not letting enough power to subsidize the power drain using the power steering. You engine at the moment couldn't get enough juice to rev as usual. Check to see if your battery is in good shape...and your alternator.

:confused: The power steering isn't going to be drawing any current, and the current from the alternator first would go to the engine, and second to charge the battery. I'm having a little trouble following your logic on that one.

COOL, so I'm sooo wrong :):rotfl: It's just my thoughts on the matter...I once made a quick U and the engine rpm dropped to a stall. Had to quicking restart and was good to go. I always thought in my head it as the power system...that's why I started out with "I THINK"...what do you think would cause that?

or if your car is in park and you tap the gas, the gauge will dip down a few hundred RPM before going up, and you will lose some volts

That has happened to me several times.....I wonder what causes it? Also, like the good tb owner I am I took it in and guess what? Can't duplicate the problem...kinda like they couldn't tell my oil pan was leaking until I brought it in for the 3rd time....

I too have had this problem. Primarily when I start the TB up for the first time of the day and let it run in the driveway. I can stand there and listen to the RPM's dip for about 5 minutes and if I wait long enought it'll eventually die.:worried: I had a Mitsu Galant that did the same thing but never died. took it ot the dealer and they said it was a "coil"(they weren't very specific). Problem solved and never happened again. <-- speaking about the galant here.

Could this be a similar problem I wonder?:confused:

Did you have the HVAC system on at the time? The problem is at full stop there's a tremendous amount of pressure generated by the power steering pump. The sound you hear when at full lock is a relief valve. Most vehicles have an override which cuts the A/C compressor when turning the wheel to full stop as well. I haven't noticed this problem in my TB yet, I will attempt to duplicate tonite and see if it's "normal" or a problem.

My Envoy does this too, but for me it's usually when I'm sitting at a traffic light. I usually rev it a bit when it stumbles because I'm always afraid it's going to die. Not sure if this is good or not, though.

yeah even on occasion if you get it right with the revving, the car can nearly stall... I never figured it out

I just changed my intake to Airaid. After the installation, the PCM is reset, by unplugging the battery. When I finally start the car, the PCM had to relearn everything and so the engine would stall occasionally. The RPM dropped down below 500 and keeps jumping around till it finally determine the best setting to keep it idle at 600.

I also see the rpm drop a bit when I rev in park or neutral. After the first, subsequent reving test didn't show much dropping, but the needle does spike down 50...

I'm guessing the inital power draw is not enough...I may be soooo wrong so flame away, my firewall is quite thick. :)

I dont know if my tb has done it before but i havent noticed it

anyways its a 02 2wd short base with 62k miles

i was making a sharp left turn into a parking spot late last night about 3-4am, and when the wheel was cranked all the way to the left the idle dipped to like 100-200rpms, i know that the power steering will do that a little if you hold it but i didnt hold it .

A problem or just because i cranked it all the way and power steering was working to hard
Happened to me when I first installed my intake but the OBDII adapted to the new air flow.

Did you have the HVAC system on at the time? The problem is at full stop there's a tremendous amount of pressure generated by the power steering pump. The sound you hear when at full lock is a relief valve. Most vehicles have an override which cuts the A/C compressor when turning the wheel to full stop as well. I haven't noticed this problem in my TB yet, I will attempt to duplicate tonite and see if it's "normal" or a problem.


didnt have anything on, hvac was off, radio was off, just did it and scared me, and of course the lights dimmed like they do when you try to roll 2 windows up or down, previous owner just replaced the battery so the battery is new

well todAy for the first time my car actually stalled!! i turned the steering wheel to full lock all the way to the left, i saw the revs dip as usual and then to my surprise the car switched off.. :confused: i was surprised, but i had a couple of drinks so i didnt really mind about it, now im wondering why it happened, i do have a service in about 2000kms...i was thinking that might be the case...oh well if it happens again ill take it into the dealers, anybody think by changing my spark plugs to NGK would be good??? how about the wires to MSD?? plz let me know some info about this if anyone has done it

oh well if it happens again ill take it into the dealers, anybody think by changing my spark plugs to NGK would be good??? how about the wires to MSD?? plz let me know some info about this if anyone has done it
OK, there are no spark plug wires on the 4.2L I6 motor, dont know about the 5.3L V8. The I6 uses a coil on plug design, and has a seperate ignition "pack" for each spark plug, so there are no wires to change here. As for the plugs, I put in some Bosch Platinum +4 plugs, and they are ok, but I would probably go back to the stock plugs without any regrets. The stock plugs actually turned the engine over quicker, but it still runs like a charm, so Im not complaining.

My 2002 Trailblazer LTZ's battery died, when I put in the new battery everything worked great, except when the heater blower would come on, rpms would dip and engine would eventually stall, turn off the heater and rpms bounced back to around 600 and stayed steady. It runs great as long as the heater or ac is not running. Has anyone had a similar problem? I had no trouble until I changed the battery.

My 2002 Trailblazer LTZ's battery died, when I put in the new battery everything worked great, except when the heater blower would come on, rpms would dip and engine would eventually stall, turn off the heater and rpms bounced back to around 600 and stayed steady. It runs great as long as the heater or ac is not running. Has anyone had a similar problem? I had no trouble until I changed the battery.

I reset my Power Control Module a few times, by removing the battery, over fifteen mins (I think...) After hooking back the battery, the PCM took 45 mins before it settle for the right settings to keep idling at 600RPM. Before the learning, my RPM fluctuates up and down 600. A few times the engine stalls. Finally it was good to go.

Don't know what sup with the heater blower... BTW, did you charge the new battery up to full? Battery ususally come new not fully charged. I had to charge it overnight before installing. Or, the shop would do it free for you.