Hard clunk when going to over drive
 

Today on a few different occasions when the transmission shifted into overdrive it felt like a hard clunk. Most of the time driving today it shifted perfectly and no other gears seem to have an issue. I have codes for camshaft sensor (p0340)
Fuel level sensor high output (p0463)
Mass air flow low input (p0102)
I just bought this blazer and it seems to shift fine this past whole week and most of today. It seemed to happen when I let off the gas a little before it shifted into o/d. Any advice or comments??

Forgot to mention it's a 2000 blazer trailblazer edition. 4dr 4wd 133k

Almost 100 views and no one can chime in? This is my first post and if it's in the wrong place or brought up before at least point me in the right direction.

Congratulations on your new blazer. I'm a fan of the two-tone leather. Welcome to the forum. Your question is posted in the right place. It's just hard for me to think of one problem that will give you those 3 codes and a clunk.


Check your transmission fluid. If you can make it clunk by letting off the gas before it shifts, stop doing that until we can help you get it sorted out. Did the seller tell you anything about any recent repairs? How does it run? I would try to get the engine codes fixed first. The engine problems may be causing the clunk.

The last owner said nothing about problems which is usual. And it seems like he just changed the fluid because it is in very good shape with no bad odor. It drives great except sometimes at startup it bogs down when I accelerate but only for about 10 seconds then it drives normally the rest of the time I'm driving it. All gears shift smooth. I just took it to a transmission shop they said it didn't sound like a actual part breaking inside the transmission because it's intermittent and not every time I drive it. He said to start with the camshaft sensor first and see how that goes. Hopefully it will work. I found it for 12$ on eBay but I need it today so I'll suck it up and buy one for around 40$ and put it in tonight. He said to make sure I clear the code after doing it and not just disconnect the battery. Can i use the scanner from advance to clear the code like he is recommending?

Update
 

Have you solved the problem?