I recently replaced the timing belt on my 240 sedan. Luckily a friend had a special tool that you need and the job was pretty well. I was very careful lighting up the timing belt. I used my Bentley's manual. The car started and runs great but the idle little fast.

Any thoughts would be greatly appreciated.

Interesting; I didn't realize the 240 used a timing belt.
So the 240 uses a "interference" engine. If the engine is running and the belt brakes then it is new engine time.

What did you read in the original post that led you to that wrong conclusion?

One of the beauties of a 240's engine is that they aren't interference. If the belt snaps, the engine just softly shuts off and you coast to a halt -- then put on a new belt and the engine is as good as new (or as "new" as it was before the belt break).

In fact, the easy diagnosis of broken belt (as opposed to a F.I. or ignition system failure) is simply to have someone crank the starter (so that the crankshaft and its pistons move) as you remove the oil fill cap and watch the valve gear -- if they're stationary, it's the belt! All without danger to the engine.

"So the 240 uses a "interference" engine. If the engine is running and the belt brakes then it is new engine time."

Not true, Non interference that is the beauty of it.
Dan

FWIW, the 2 things I always look at on TB changes are:

1. Do the factory marks line up with the current or old belt, if so good. I then mark the belt relative to the pulleys and transfer the marks to the new belt. This keeps the relationship between all the pulleys/sprockets. Wish I could claim it was my idea, but either way, this works flawlessly, probably more important on multiple cam engines where the cams tend to move than the B230.

2. If the cam mark is off, remember everthing is relative to the crank mark, then you will need to correct this once you remove the old belt. You can still mark the old belt and transfer marks to the new belt, but you will need to rotate the cam 1 tooth (typically) in either the advance or retard direction to line up the cam sprocket with the mark.

Hope this helps. I would double check the cam mark once you have the crank lined up to see where you are. Once you know this is correct, check for vac leaks, unusual throttle body adjustments, etc.

Mike

First guess..dislodged vacuum hose.

Third guess...

Cam timing was off in the previous belt change and someone compensated at the throttle stop screw. Now that you put the belt on correctly, the air has to be reduced again at the throttle. (Ignition timing on this car is not affected by the timing belt, just spark plug selection.) Does it have more pep now?
--
Art Benstein near Baltimore

"24 hours in a day, 24 beers in a case. Coincidence? I think not." - Stephen Wright

Second guess.....

Distributor timing advanced a little.
Maybe 1 tooth on the timing belt gear?

steve