New engine with poor idle. need direction
 

I just reinstalled the engine I rebuilt. Started up fine but with a little high rpm for the warm up period. Eventually settled down to 750 rpm as it should. After a few minutes as the engine warmed up, the idle got radical and was hunting between 300 and 1000. and eventually stalls. It gave a p0170 code which is a bank 1 lean code. I cleared the code. The engine repeats the idle symptoms every time I start the car but I can't get it to repeat the code ' I did make one change to the fuel system that I didn't want to, but felt I should. I installed a set of used direct injectors. I bought them to replace the previous set. When they arrived they were the #2 injectors and my originals were the #3 injectors. I know there is a difference in them but I didn't think it would cause this issue. I thought it might effect fuel efficiency but that's all. I can reinstall the old ones but I'm waiting on the seal installation tool. I did clean the originals and they seem to be ok.

Has anyone changed to a different # direct injector with similar results. If this problem doesn't sound like an injector issue, what do you think it could be.
Thanks
Roger

Sounds like it could be a vacuum leak

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Plus 2 You sure the hose under the intake manifold is on good?

Have you ran it long enough for the ECU to "learn" where the idle should be?

Why did you replace the injectors?

I had a miss prior to pulling the engine that i couldnt find. New plugs. New coil packs. Still a miss. At teardown, one cylinder was very carboned up. So i took that to be the missing cylinder. I blamed it on the di without diagnostics

I will recheck the hoses under the intake tomorrow. Thanks

Found the problem. One of the hoses that goes on the solenoid valve under the the intake manifold was barely on the barb. I pushed it up tight and the problem is solved. Thanks for all the help.

Just what I thought glad I could help.:w00t: