Idle drops very low. Bad tune?
#1
Idle drops very low. Bad tune?
Did a timing belt job due to mileage and changed my coils and plugs due to a misfire. The misfire is now gone, but car runs like garbage. Whole on idle the rims drop to 500-600 and the whole car vibrates. Wot it feels good though. Should I try seafoam? I have a feeling that injectors might be dirty. Also car runs really rich wot. Afr goes up to 15.3 on idle. What is happening? I'm gonna try logging it next and post a picture of the log and ecuflash screenshot.
#4
Evolving Member
Im having a similar problem but for me it has resolved itself after a couple heat cycles. I drove the car 300ish miles straight and then when I pulled into my destination, i was blipping the throttle to keep the engine running because the rpms were going too low for the car to idle.
Now it idles fine with an occasional problem but it has only been a couple days after I had problems.
Hope this helps!
EDIT: Forgot to mention until user Ferp commented, relearning idle fixed the problem.
Now it idles fine with an occasional problem but it has only been a couple days after I had problems.
Hope this helps!
EDIT: Forgot to mention until user Ferp commented, relearning idle fixed the problem.
Last edited by jheff; Dec 26, 2016 at 01:00 PM. Reason: Clarification
#5
Evolving Member
Does your car only run like **** at idle? Did you let the ECU relearn idle? If you have Evoscan and a Tactrix you can use the BISS actuator and make sure that is set properly too.
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#8
Evolved Member
If the car is still on a mass air flow system then it sounds like a boost leak.
Or could be a idle air control valve issue. For the idle.
Do you have a logger?
Or could be a idle air control valve issue. For the idle.
Do you have a logger?
#10
Evolved Member
Please dont do a visual and please do a real boost leak test and report back. Ok then. Log your fuel trims for 16 min.
#12
Evolved Member
Fake boost leak is you reporting back that there is no leak after doing a visual inspection.lol
#13
Before you go somewhere and pay for any services
(Unless you do it on your own)
Check the Nipples on the Throttle Body.
If the THIN rubber hoses or Rubber Caps are OFF
You will have a Vacuum Leak which will change your idle drastically.
Usually these blow off when your in 4th-5th gear boosting -- going like 100mph and release the throttle. Happens to me ALL THE TIME. I bought rubber end caps at autozone.
But due to Weathering.. and Boosting.. they can crack or slip off.
After you look around for loose rubber hoses.. and find NONE.
Go do a boost leak test which will detect these anyway.
But some places charge like $30 for this or even more.
So if you can find the Vacuum Leak on your own and plug it in..
You'll be thrilled and how easily that fixed the problem.
But! There are many places were these small rubber hoses connect to.
At least this is the issue for the Evo 8/9's. But i cant see how it would differ much on a X.
Hopefully you solve the vacuum leak.. but obviously a boost leak test is the next step and should be done regardless to ensure everything's on point
(Unless you do it on your own)
Check the Nipples on the Throttle Body.
If the THIN rubber hoses or Rubber Caps are OFF
You will have a Vacuum Leak which will change your idle drastically.
Usually these blow off when your in 4th-5th gear boosting -- going like 100mph and release the throttle. Happens to me ALL THE TIME. I bought rubber end caps at autozone.
But due to Weathering.. and Boosting.. they can crack or slip off.
After you look around for loose rubber hoses.. and find NONE.
Go do a boost leak test which will detect these anyway.
But some places charge like $30 for this or even more.
So if you can find the Vacuum Leak on your own and plug it in..
You'll be thrilled and how easily that fixed the problem.
But! There are many places were these small rubber hoses connect to.
At least this is the issue for the Evo 8/9's. But i cant see how it would differ much on a X.
Hopefully you solve the vacuum leak.. but obviously a boost leak test is the next step and should be done regardless to ensure everything's on point
#14
Update. Did the boost leak test. Large leak in the tb gasket and a small leak in the piping (clamp not tight enough), also 2 of the hoses behind the intake manifold were completely off. fixed both things but still seeing the same thing. Car does feel slightly smoother and It feels like I got 30+ HP back, but still feeling that rough idle. My car died on almost every stop sign, no change when it got warmed up.
Another Update. CEL popped up, P0446, something to do with EVAP. Tried doing a log while stationary, car died every time after i gave it a rev past 4-5k rpms.
Another Update. CEL popped up, P0446, something to do with EVAP. Tried doing a log while stationary, car died every time after i gave it a rev past 4-5k rpms.
Last edited by Evo47; Dec 30, 2016 at 04:53 PM.