Only does it on Hot and Humid days... did it last Summer then stopped in the fall.... no problem during winter/spring.... now it's hot a humid and it's doing it again. Have been told it could be TPS. My problem is I don't know where it is located on the motor. A diagram of location would be helpful.
The issue sound as if it were a sensor that is not working normally, that is because of the weather condition that make the sensor misbehave. Shift gears on auto trans are not only depending on sensors also on the main ICU. You need to start by checking the trans. main sensor that is mainly located where the trans is. It could be on the sides or the top part of the trans. If its not the sensor then it might be the ICU. The TPS is also another sensor but I find this hard to believe because the TPS works mainly with the EFI system which control the fuel intake when you use the accelerator.
You will need a multimeter to test the tps--do you have one? Normally, a bad tps will set the engine light--is it on?
if yes to both of these questions, have the computer scanned at your local parts store and post the trouble codes here. Also reply with engine size if you want a test procedure.
SOURCE: Engine RPM too high when transmission shifts. Bangs into gear.
check your fluid level when the car is warmed up
SOURCE: Blazer transmission not shifting properly beetween 1 and 2
Your going to have to get the ECM scanned, Auto Zone scan's for free and most garage now will scan for $10.00 to $15.00 since they all have the scanners now and need the business.
You could have a Vehicle Velocity Sensor (V V S) going bad or the wire harness it self. The V.V.S tells the ECM how fast the drive shaft is rotating and calculate's what gear it should be in relative with the engine speed and throttle position, and transmission fluid pressure.
Regardless you need the Blazer scanned to pin point why your transmission is shifting the way it is. Could be as simple as time for transmission oil and filter change for $125.00 or a loose wire harness.
Check your transmission fluid and try not to run the blazer to hard, to replace the transmission start at $1,900.00 for a rebuilt.
Good luck and hope this helps. Keep me posted
SOURCE: BLOWER MOTOR ON 2004 AVALANCHE IS SLOWLY PUMPING OUT AIR
it may not be the blower motor. it may be the blower motor control module which use to be the resistor. it's located under the pas. side. remove the black coyer , 2 scaews above the pas. foot area. then remove the blach unit that has a purple wire going to the back of the motor on the right. price about 140 dollar with tax.
SOURCE: My 2002 chevrolet 2500hd 4 wheel drive will not
I would check the wire harnesses for damage (pinching, cuts and such) from the transfer case. There may be damage from the trans install. Also fuse panels both under hood and interior. Since no lights are on it is probably a fuse or the harness is disconnected.
Testimonial: "I can't believe you responded! Thank you so much! I hope it works!"
It can be issue
with IAC( idle air control valve) causing the problem.
There
are many other possibilities causing these idle issues. Engine idles rough.
There
are few help links with solutions to troubleshoot such idle issues.
I
suggest you refer the link below and follow
its troubleshooting details:------
Click
the link below:-----
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http://schematicsdiagram.blogspot.in/2012/03/stumbling-and-stalling-at-idle-after.html
------------
http://technoanswers.blogspot.in/2012/01/1999-ford-f-150-idles-rough-and-quits.html
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http://repairhelpcenter.blogspot.com/2012/01/engine-stumbles-coming-off-idle-when.html
------------------
http://schematicsdiagram.blogspot.com/2011/12/erratic-idle-on-car.html
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Cold start problem and vehicle shudder around 2500 to
3500 rpms
----------
http://repairhelpcenter.blogspot.com/2011/12/low-idle-when-cold-out-side.html
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http://technoanswers.blogspot.com/2012/10/gmc-sonoma-stalls-and-idles-low.html
--------
http://schematicsdiagram.blogspot.com/2011/12/gmc-idle-air-control-iac-valve.html
-------------
http://repairhelpcenter.blogspot.com/2011/10/1996-camry-intermittent-engine-failure.html
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http://repairhelpcenter.blogspot.com/2011/10/engine-quits-at-idle.html
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http://howtobyme.blogspot.com/2011/11/car-overheats-and-air-blows-hot-at-idle.html
---------
High
Idle Problem
http://repairhelpcenter.blogspot.com/2012/10/high-idle-problem.html
-------
http://schematicsdiagram.blogspot.com/2012/01/while-stop-engine-idles-like-cylinder.html
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http://technoanswers.blogspot.in/2012/02/idle-flair-is-noticed-on-car-rough-idle.html
--------
http://technoanswers.blogspot.in/2012/02/high-rpm-in-neutral-inconsistant-high.html
-------
http://schematicsdiagram.blogspot.in/2012/03/vehicle-stumbling-at-idle-and-shows.html
----------
http://technoanswers.blogspot.in/2012/03/rough-idlestaling-and-erratic-shifting.html
-----------
http://schematicsdiagram.blogspot.com/2012/01/while-stop-engine-idles-like-cylinder.html
---------
These
details will help.
Thanks.
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