View Full Version : Slipping tranny?
Jophus
02-09-2007, 08:58 PM
I was going to go have this checked out soon, but I figured to asked the experts here at trailvoy before I do anything. I owned my 2002 trailblazer lt ext about 12 months before having any problems. Then someone put bleach in my gas tank, so I replaced the fuel filter after it had trouble even starting, let alone running. It ran like crap for about two weeks and then the alternater went bad, then the battery. I got everything fixed for about two weeks, but on a hard takeoff the tranny hesitated to shift into third gear. its fine on an easy takeoff, but hit it hard and third gear bails out. any thoughts?:weird:
Neil Patel
02-12-2007, 10:03 AM
Is that supposed to be someone's idea of a practical joke? Might want to get a locking gas cap if there are people around your area that do crap like that. None of your issues seem related to the bleach incident though. I would think something like that would be isolated to the fuel system and possibly an O2 sensor.
As for the transmission. Check the fluid, make sure the level is correct and check the quality. I believe others with 3rd gear issues have reported broken bands and forward gear clutch failure, but it could be many other things.
MTPockets
02-12-2007, 10:16 AM
Hard to say. Performance concerns with the engine will effect the way the trans shifts. You have to eliminate any engine problem first. Are you getting any diagnostic trouble codes? (SES light)
Joel
Jozuah
02-12-2007, 08:54 PM
i agree with Joel , i would have the codes read first. if it shows O2 sensor replace it reset the PCM by your preferred method and see what happens.
after driving so far and goofing around with different things on the way i have realized that these engine trans in these are so totally integrated ..
Example, driving at 75 MPH on totally flat ground if you activate the stop lamps with your left foot while holding speed with your right foot it down shifts.. thats weird to me , but shows how in control the PCM is over the entire power train.
Blueblazed
02-12-2007, 09:03 PM
after driving so far and goofing around with different things on the way i have realized that these engine trans in these are so totally integrated ..
Example, driving at 75 MPH on totally flat ground if you activate the stop lamps with your left foot while holding speed with your right foot it down shifts.. thats weird to me , but shows how in control the PCM is over the entire power train.
That's nothing new. My 87 Ford van did that. Had the owner of a transmission shop show me that. It's probably the torque converter lockup clutch disengaging, not really a downshift.
Not sure why you would be driving like that though . . . :D
Jozuah
02-12-2007, 09:20 PM
That's nothing new. My 87 Ford van did that. Had the owner of a transmission shop show me that. It's probably the torque converter lockup clutch disengaging, not really a down shift.
Not sure why you would be driving like that though . . . :D
ah lol well .. i was driving from Iowa to Utah towing a trailer ( don't ask bad time all around) and was TOTALLY bored so i started goofing around with stuff like the brake pedal and seeing how far i could get up hills before it would down shift ,, how many miles to the gallon ( DIC ) i could get by driving slower or faster by 1 mile increments stupid time killing things like that.
MTPockets
02-12-2007, 09:23 PM
The GM 4L30E in my 2002 isuzu rodeo was like that. It had what was called "grade logic". If you were picking up speed while coasting down a hill (foot off the gas), the trans would downshift to aid in compression braking. I didn't like it. You could deactivate it by selecting "power" mode on the console button.
Joel
Blueblazed
02-12-2007, 09:35 PM
The GM 4L30E in my 2002 isuzu rodeo was like that. It had what was called "grade logic". If you were picking up speed while coasting down a hill (foot off the gas), the trans would downshift to aid in compression braking. I didn't like it. You could deactivate it by selecting "power" mode on the console button.
Joel
I hear you. That's one of the things that some would consider a "feature" while others would consider a nuisance!
i was driving from Iowa to Utah towing a trailer ( don't ask bad time all around) and was TOTALLY bored so i
I understand completely. I drive from San Diego to Phoenix about 4 or 5 times a year. For about 200 miles of it, there is nothing out there. As my Dad used to say "Nothing but miles and miles of nothing but miles and miles" - unless endless sand and brush is exciting to you! Somedays I think I know every crack in the road by name! :D:
PROSPHOTO
02-12-2007, 10:10 PM
Definitely check the operation of the engine first...it must be running 100% before a proper transmission diagnosis can be performed :yes:
Another possible result of the bleach is a melted cathttp://www.aimoo.com/forum/images/messageicon/excalmatorymark.gifhttp://www.aimoo.com/forum/images/messageicon/question.gifhttp://www.aimoo.com/forum/images/messageicon/excalmatorymark.gif
Jophus
02-13-2007, 06:23 AM
I did fix up the engine, all it took was a fuel filter change, a locking gas cap, and about five weeks, or three gas tanks with treatments. I only have 45600 miles so I put some slick 50 in there to see what happens, and thanks for the inpute.
CARBONGSXR
02-13-2007, 07:22 AM
they did something like that on "mythbusters". out of everything they tested, the only thing that stoped the motor cold was bleach... and they used everything from sand to rocks in the carb, vinegar, water, you name it.
my:m2: sell it! matt :cool:
PROSPHOTO
02-13-2007, 07:43 AM
they did something like that on "mythbusters". out of everything they tested, the only thing that stoped the motor cold was bleach... and they used everything from sand to rocks in the carb, vinegar, water, you name it.
my:m2: sell it! matt :cool:
Syrup will kill it, won't stop it, but try starting again after it cools downhttp://www.aimoo.com/forum/images/messageicon/excalmatorymark.gif The sugar will lock up the motor