2000 Blazer RPMs jumping up and down at steady cruising speeds
#11
08-08-2017, 06:54 PM
The 3-4 clutches are failing. Need to rebuild or replace transmission. If you drop the pan and put new fluid in you will finish them off in a hurry. Not going to be able to repair while in vehicle.
#12
08-08-2017, 07:00 PM
Originally Posted by PuckinBlazer
Hmmm.. well that worries me. Thanks for your input. My tranny does some other weird stuff too. Like accelerating quickly onto the freeway, for example, RPMs would be a steady rise, then out of nowhere, jump to like 4k. It pretty much does this for 3rd and 4th.
i dont know.. i'm not a transmission guy either. I worked as a GM tech a few years back and saw 'em getting disassembled all day, but I never touched 'em or paid attention. Quit my apprenticeship (regrettably. I'm fairly young, obviously) and decided to just keep automotive as a hobby and side business.
well, if a TCC solenoid, boost valve and fluid flush doesnt fix it, time to start reading up on rebuilds and go pull one from the yard to start working on.
i dont know.. i'm not a transmission guy either. I worked as a GM tech a few years back and saw 'em getting disassembled all day, but I never touched 'em or paid attention. Quit my apprenticeship (regrettably. I'm fairly young, obviously) and decided to just keep automotive as a hobby and side business.
well, if a TCC solenoid, boost valve and fluid flush doesnt fix it, time to start reading up on rebuilds and go pull one from the yard to start working on.
#13
08-08-2017, 07:24 PM
Well... ****..
definitely not what I wanted to hear, but I suppose it's best to get a foot forward on a rebuild.
As this is my DD, I have no choice but to ride it till it dies while working on rebuilding a relacement..
I've never rebuilt a transmission, but google and youtube is awesome. I've also stayed in touch with one of the Master GM Techs from the dealership whom could be coaxed to looked it over with me over a 12-pack, lol.
I'm going to the yard tomorrow for a couple other things and could look for a good candidate. Are there specific models, years, etc that might work better in my Blazer? What to look for in a used tranny before pulling?
The guy at Sonnax told me my 4l60e PROBABLY has the .421 boost valve bore due to it being a light duty truck. Should i pull my new tranny off a bigger truck that would have the .470?
sorry if these are dumb questions, I don't know **** about transmissions and have always been weary of learning, but after a few rebuild videos, I'm not quite so intimidated
definitely not what I wanted to hear, but I suppose it's best to get a foot forward on a rebuild.
As this is my DD, I have no choice but to ride it till it dies while working on rebuilding a relacement..
I've never rebuilt a transmission, but google and youtube is awesome. I've also stayed in touch with one of the Master GM Techs from the dealership whom could be coaxed to looked it over with me over a 12-pack, lol.
I'm going to the yard tomorrow for a couple other things and could look for a good candidate. Are there specific models, years, etc that might work better in my Blazer? What to look for in a used tranny before pulling?
The guy at Sonnax told me my 4l60e PROBABLY has the .421 boost valve bore due to it being a light duty truck. Should i pull my new tranny off a bigger truck that would have the .470?
sorry if these are dumb questions, I don't know **** about transmissions and have always been weary of learning, but after a few rebuild videos, I'm not quite so intimidated
#14
09-18-2019, 03:19 PM
Originally Posted by LesMyer
If this problem starts at exactly 46 mph (and above, in 4th gear) it is the torque converter clutch connecting and disconnecting. If this is what is happening, we can discuss more.
#15
05-02-2020, 05:57 PM
R
Originally Posted by PuckinBlazer
2000 Blazer ZR2 4X4 auto 225000 miles.
I picked this Blazer up a few weeks ago. Didn't seem to have any issues other than being a bit sluggish, so performed some routine maintanence as ritual with every new-to-me vehicle.. Removed and thoroughly cleaned throttle body and IAC. Cleaned MAF with electronic cleaner. Replaced fuel filter and PCV. Oil changed with 10w-30 maxlife synthetic blend..
Now starts up great and idles around 600-700.
a few days after doing all this, I noticed when cruising at any RPMs between 1k - 2k, the tach jumps up and down and loses power until I accelerate over 2k or let my foot off the gas. The speed or gear doesnt seem to affect this, as long as I'm in that range of RPMs, it fluctuates and seems like it's struggling.
I'm new to the whole spider assembly thing, could that be it? Seems like it would do it all the time if that was the culprit.
waiting on new plugs in the mail, anything I should check before I rule those out?
No check engine light and no visible leaks..
thanks!!
I picked this Blazer up a few weeks ago. Didn't seem to have any issues other than being a bit sluggish, so performed some routine maintanence as ritual with every new-to-me vehicle.. Removed and thoroughly cleaned throttle body and IAC. Cleaned MAF with electronic cleaner. Replaced fuel filter and PCV. Oil changed with 10w-30 maxlife synthetic blend..
Now starts up great and idles around 600-700.
a few days after doing all this, I noticed when cruising at any RPMs between 1k - 2k, the tach jumps up and down and loses power until I accelerate over 2k or let my foot off the gas. The speed or gear doesnt seem to affect this, as long as I'm in that range of RPMs, it fluctuates and seems like it's struggling.
I'm new to the whole spider assembly thing, could that be it? Seems like it would do it all the time if that was the culprit.
waiting on new plugs in the mail, anything I should check before I rule those out?
No check engine light and no visible leaks..
thanks!!
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