Need help after a rebuild

[stubborn1]

I just finished reassembling my 98 Prizm with the 1ZZFE after replacing the piston rings and a valve job. When I try to start the car, it gives me an occasional sputter, but otherwise nothing. When I hold down the gas about 1/2, it fires and idles at about 2800 rpm. Even after warm, it won't drop below 2800 rpm. I didn't let it run more than 3 min or so because I was afraid of overheating.

First thing I thought was that I may have skipped a gear in my timing, but I double checked and everything looked good. The only CEL I get is a random cylinder misfire on #4. Plug and wire look good, so I think that may be an after effect of the real issue.

Any ideas???

[retiredat44]

double check you vacuum lines, hoses,, etc.. did you take pictures before you took it apart??

[stubborn1]

I'll double check the lines again, but I did have a picture and thought everything went back to where it came from. There aren't too many to figure out on this engine - only a handful around the throttle/intake area.

[ghost_ryder35]

use the picture on the underside of the hood for the vaccum lines. If those lines check out right, look into timing issues. Being that it revs at 2800 constantly I think you mixed one of the vaccum lines up.

[stubborn1]

I'm assuming if my timing was off, it would be throwing a code. The only thing my scanner picked up was a P0304 - cylinder #4 misfire. I'm also guessing vacuum hose is the probable culprit.

If I can't get the idle down under 2800 rpm, I'll be posting a clutch replacement thread soon

[stubborn1]

Well - all of the vacuum lines check out. It's running with an obvious miss around 2500 rpm consistantly. I did a compression test, and I'm at 185-190 on all cylinders. I'm assuming I could still get good compression with the timing slightly off.

I pulled the valve cover again, and the timing marks on the cam sprokets line up the same way they did before I pulled it apart. The "pre-rebuild" timing picture is below. New is the same. I double checked that I'm at TDC on #1. The crank pulley is sitting right at the zero mark.

[StealthSeo]

well then if the cam and crank are both at 0 then your fine. sounds like your throttle body turn down your throttle body idle and just check your gaskets for any leaks but i am almost sure it your vacuum line are fine but what runs to them are not

[darcsyde]

did you prime the engine before putting it back in