My wifes 2000 trailblazer has run like a top for the past year, but now when it warms up and you put it under load like climbing a hill or something it wont go, it just bogs down and wont wind out, I checked my plug, air filter, belt, clutch spring, everything seems fine, it doesnt do it till it warms up a little, any help would be appreciated, thanks

 

Hmmm. You may have a restricted fuel flow. Try draining the carburetor bowl and installing a new fuel filter. If that doesn't work try adjusting the float level and inspecting the main jet for dirt ingestion.

This is assuming that the Trailblazer is not missfiring, it is just down on power.

 

<< ... but now when it warms up and you put it under load like climbing a hill or something it wont go, it just bogs down and wont wind out... thanks >>



Here is a hypthetical long shot. Your oil injector is not functioning properly and the engine is binding because of a lack of lubrication as it warms up.

 

My Xplorer did something very similar. Does it seem to run fine (the engine) but bog way down if you start going up a hill?
If it does, it may be the same thing I had wrong with my Xplorer.
We need to figure out if it is in the engine or transmission.
First the transmission.
Try this:
drive along on the flat, approaching a hill. Try climbing the hill and see if it bogs way down. If it does, now go back to the same hill. This time stop right at the bottom of the hill. Does it seem to climb it OK now?? If so, I would guess either the rear clutch buttons or rear clutch bushings. My problem was the bushings.

Now if it seems to be shifting all OK, check the fuel tank vent, the fuel filter, and carb vent. Usually if one of these are plugged, the engine will cut out or misfire, but not always. Could it possibly be a spark plut (doubtful, but desperate times call for desperate measures).

 

What type of oil are you using? I've seen power loss problems on outboard motors from having the pipe full of carbon. Like farmr said though, you have to isolate whether it's the engine or drivetrain.

 

thanks for the ideas guys, I will try looking at the fuel filter and cleaning the carb and vents, When the engine is under load it is still smoking good like it is rich so im assuming im getting enough oil, im using the polaris brand non-synthetic, I will go throught the carb and fuel lines to rule that out, Im not real experienced when it comes to the concentric drive, i took the belt cover off and inspected everthing and it all looks good, I will concentrate on the motor to rule that out first before tackiling the transmision i will also change the plug, thanks for the info I will let you know how it turns out.

 

It may be as simple as a jetting problem. If you drive around at a slow speed with a bit of strain on your motor (like crawling around a small mud hole or towing something at a slow speed) does it not hold a steady idle? or even get boggy if so move your needle clip up one notch.

 

Well, a shower chased me out of the hay fields, so here I am again. While on the tractor I had a few thoughts (radio quit &amp; I gotta do something to occupy my mind).
You said it acts boggy after it warms up. I already mentioned how I would suggest you check if it is the tranny. I had another thought to check if it is the engine. Drive it around and warm it up good. Now kick the tranny into Neutral and rev up the engine. Rev it up pretty good, but don't blow it up!! [img]i/expressions/face-icon-small-happy.gif[/img]
Does it sound 'fat' at all. You mentioned it smoked and all like it was getting enough fuel. Maybe it is getting too much. I would first be ABSOLUTELY POSITIVE the choke goes off all the way. Check this at the carb, in case there is a bind in the cable somewhere. Also, I have heard of cases where mud or carbon build up in the muffler causing a restriction.
I don't know if this is your problem, but is easy to check without taking anything apart more major than the plug in the muffler.