Hi all, new here. Found this place when looking to change the fuel filter.
Anyway, my mom said her 2002 TrailBlazer isn't running "the same" as it used to. I never drive it myself so I really didn't see much problem with it. But she insists it is more sluggish than usual.
So I planned to change the air filter, plugs and fuel filter. While searching for this I found many treads that people all had good luck simply cleaning the throttle body out. It has 101K on it at the moment and as far I I know the air filter was changed maybe 1 or 2 times, fuel filter and plugs were never changed.
Here is the article I used:
http://forums.trailvoy.com/articles.php?do=viewarticle&artid=91
Anyway, first I change the air filter to a K&N filter and at the same time I follow the instructions to clean the throttle body. It wasn't nearly as dirty as the one in the picture but I cleaned it and everything seemed to go as the instructions said it would.
So i put it all back together, triple check connections, and start it up. During the first 5 minutes all seemed OK. Was idling around 1100 RPM and throttle response (while in park) seemed instant. Well the problem is the longer I let the truck idle the RPM gradually kept getting lower and lower at idle. Eventually it seemed to settle at 600 RPM. I have no idea if that it good or not, but the problem is if I let it sit for about 30 seconds, apply throttle it seems to bog\hesitate then jump to 1200-1500 rpm, then I let of the throttle it drops to 700 RPM, then back to 800-900, then back down to 600. So letting off the throttle it jumps around a bit before settling back at 600 rpm. (Now if i rev it to 1500, then let it settle to 600 , then immediately rev again I hardly see the bog at all, but let it sit 30 seconds to a minute at it bogs on initial acceleration.)
I have not taken it for a drive in fear that something is wrong, so all this was done while in park and revving the engine to 1500 slowly.
I had driven the truck not too long ago and I am almost positive it idles around 1k and I don't remember this hesitation I am experiencing that is very obvious right now, almost as if it wants to stall, but the engine doesn't get to the point where it shakes or sputters.
Any advice? Or need more information?
Thanks
Anyway, my mom said her 2002 TrailBlazer isn't running "the same" as it used to. I never drive it myself so I really didn't see much problem with it. But she insists it is more sluggish than usual.
So I planned to change the air filter, plugs and fuel filter. While searching for this I found many treads that people all had good luck simply cleaning the throttle body out. It has 101K on it at the moment and as far I I know the air filter was changed maybe 1 or 2 times, fuel filter and plugs were never changed.
Here is the article I used:
http://forums.trailvoy.com/articles.php?do=viewarticle&artid=91
Anyway, first I change the air filter to a K&N filter and at the same time I follow the instructions to clean the throttle body. It wasn't nearly as dirty as the one in the picture but I cleaned it and everything seemed to go as the instructions said it would.
So i put it all back together, triple check connections, and start it up. During the first 5 minutes all seemed OK. Was idling around 1100 RPM and throttle response (while in park) seemed instant. Well the problem is the longer I let the truck idle the RPM gradually kept getting lower and lower at idle. Eventually it seemed to settle at 600 RPM. I have no idea if that it good or not, but the problem is if I let it sit for about 30 seconds, apply throttle it seems to bog\hesitate then jump to 1200-1500 rpm, then I let of the throttle it drops to 700 RPM, then back to 800-900, then back down to 600. So letting off the throttle it jumps around a bit before settling back at 600 rpm. (Now if i rev it to 1500, then let it settle to 600 , then immediately rev again I hardly see the bog at all, but let it sit 30 seconds to a minute at it bogs on initial acceleration.)
I have not taken it for a drive in fear that something is wrong, so all this was done while in park and revving the engine to 1500 slowly.
I had driven the truck not too long ago and I am almost positive it idles around 1k and I don't remember this hesitation I am experiencing that is very obvious right now, almost as if it wants to stall, but the engine doesn't get to the point where it shakes or sputters.
Any advice? Or need more information?
Thanks