New engine with poor idle. need direction - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

Rabrooks · 04-20-2020, 08:51 PM

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

Ashikabi · 04-20-2020, 09:12 PM

Sounds like it could be a vacuum leak

Sent from my ONEPLUS A5010 using Tapatalk

Contender · 04-20-2020, 11:38 PM

Quote:

Originally Posted by Ashikabi

Sounds like it could be a vacuum leak

Sent from my ONEPLUS A5010 using Tapatalk

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

humfrz · 04-21-2020, 12:33 AM

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

Why did you replace the injectors?

Rabrooks · 04-21-2020, 01:34 AM

Quote:

Originally Posted by humfrz

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

Rabrooks · 04-21-2020, 01:35 AM

I will recheck the hoses under the intake tomorrow. Thanks

Rabrooks · 04-21-2020, 10:15 PM

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.

Contender · 04-21-2020, 11:10 PM

Quote:

Originally Posted by Rabrooks

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.

04-20-2020, 08:51 PM	#1
Rabrooks Senior Member Join Date: Oct 2019 Drives: 2020 Subaru BRZ Location: Washington NC Posts: 110 Thanks: 7 Thanked 23 Times in 18 Posts Mentioned: 3 Post(s) Tagged: 0 Thread(s)	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

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04-20-2020, 09:12 PM	#2
Ashikabi Senior Member Join Date: Aug 2014 Drives: 2013 FR-S Location: Northwest Iowa Posts: 7,359 Thanks: 454 Thanked 4,549 Times in 2,950 Posts Mentioned: 59 Post(s) Tagged: 5 Thread(s)	Sounds like it could be a vacuum leak Sent from my ONEPLUS A5010 using Tapatalk

04-21-2020, 12:33 AM	#4
humfrz Senior Member Join Date: May 2013 Drives: 2013 FR-S, white, MT Location: Puyallup, WA Posts: 30,432 Thanks: 29,826 Thanked 32,845 Times in 16,844 Posts Mentioned: 715 Post(s) Tagged: 2 Thread(s)	Have you ran it long enough for the ECU to "learn" where the idle should be? Why did you replace the injectors?

04-21-2020, 01:35 AM	#6
Rabrooks Senior Member Join Date: Oct 2019 Drives: 2020 Subaru BRZ Location: Washington NC Posts: 110 Thanks: 7 Thanked 23 Times in 18 Posts Mentioned: 3 Post(s) Tagged: 0 Thread(s)	I will recheck the hoses under the intake tomorrow. Thanks

04-21-2020, 10:15 PM	#7
Rabrooks Senior Member Join Date: Oct 2019 Drives: 2020 Subaru BRZ Location: Washington NC Posts: 110 Thanks: 7 Thanked 23 Times in 18 Posts Mentioned: 3 Post(s) Tagged: 0 Thread(s)	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.

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