Prius starts fine but idles a little rough

Does the second Gen have adjustable valves, shim-on-bucket style? They will drift. They are more stable than screw-and-locknut type (Honda for one), but...

Shim style is likely left to pros, I believe they are difficult to check/change for DIY'r. Probably expensive though, due to the difficulty.

Off-topic: is 3rd gen hydraulic, self-adjusting? I believe someone here said that. Also, I might have read that in the repair manual, but the damn thing is so terse it's hard to tell for sure.

 

Classic and 2G valves use buckets of variable thickness to provide the correct valve clearance. You are right that it is not easy to adjust because you have to remove the camshafts and substitute the correct size bucket.

3G uses hydraulic lash adjusters. My reference is the 2010 New Car Features Manual, 2ZR-FXE Engine Mechanical: Engine Unit: Details (2010 Prius), seventh page of that section.

 

It isn't overly difficult to check the clearances though. Supposed to do at 60k I think. Not many do this check I would bet. Once checked and a set of values is obtained, it can be decided if the difficult bucket replacement is necessary. From the measurements it should be possible to select a bucket length that falls into the range. IF everything is clean and goes back the same.

From my limited experiences with Toyota buckets, they stay in adjustment a long long time, pretty much for the life of the engine.

 

Patrick, do you have a link for:

2010 New Car Features Manual, 2ZR-FXE Engine Mechanical: Engine Unit: Details (2010 Prius

Thanks in advance

 

I count myself among the few who did that check, on my 2001. Several valves were slightly loose when I did the check at 60K miles. However I decided it wasn't worth the effort to remove the camshafts so I put everything back together.

techinfo.toyota.com which is the Toyota subscription website in North America.

In Europe, Toyota Service Information

 

Yikes, that's what I was thinking.

Thanks for the link.

 

Well, that sounds like fun

Not

 

I'm wondering what is the cost of an injector vs. the labor cost associated with swapping injectors around, and then having to remove the fuel rail yet another time to actually replace the failed part. Depending upon the relative costs involved it may be cheaper just to replace the injector and see what happens.

 

Good to hear. Hope this finally solves your problem