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Really really weird!

Old 11-04-2018, 09:01 PM
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Really really weird!

Im have THE WEIRDEST issue. When I put it into drive, it idles fine but when i go to step on the accelerator (from completely stopped only) it acts as if it wants to die, the rpms drop really low. Its only when i let off the gas that it goes back to idling fine. But its only when on a hill. From take off the car hesitates to pick up speed, it builds up then takes off like a bat outta hell. Any thoughts?
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Old 11-04-2018, 10:00 PM
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are you getting a check engine light
any lights flashing on your dash?


can we get additional information on the vehicle? I take it it's an automatic. year? mileage?
igntion system: OEM? Aftermarket? Last time coils or plugs were changed ?
catalytic converter still on the vehicle?
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Old 11-04-2018, 10:26 PM
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Originally Posted by Jedi54 View Post
are you getting a check engine light
any lights flashing on your dash?


can we get additional information on the vehicle? I take it it's an automatic. year? mileage?
igntion system: OEM? Aftermarket? Last time coils or plugs were changed ?
catalytic converter still on the vehicle?
Its automatic 2004 114k (jdm replaced engine done myself)
-new corvette coils
-new ngk spark pulgs
-catless
-new secondary air valve
-new fuel pump
-new alternator
-all new air hoses
-cold air intake made from 4inch pvc and rubber couplings
All parts are only 4months old.
Im getting intake air temperature, secondary air injection

Last edited by Darius Obo Thomas; 11-04-2018 at 10:28 PM.
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Old 11-05-2018, 12:32 AM
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Originally Posted by Darius Obo Thomas View Post
Its automatic 2004 114k (jdm replaced engine done myself)
-new corvette coils
-new ngk spark pulgs
-catless
-new secondary air valve
-new fuel pump
-new alternator
-all new air hoses
-cold air intake made from 4inch pvc and rubber couplings
All parts are only 4months old.
Im getting intake air temperature, secondary air injection
My money is on this one.

The OEM intake on this car is one of the best options. The only ones that are proven to be better are the AEM intake and Revi intake. Everything else is likely to cost you power.

Reinstall the stock intake and see if it goes away. If it does, keep it that way unless you have the money for an AEM or Revi.

For reference, air intake design is a lot more than "put a pipe on it"... Lots of things have to be considered. The OEM intake filter actually helps straighten the airflow so you won't have turbulence. The OEM intake is also already a CAI by definition - it pulls air from outside of the engine bay.
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Old 11-05-2018, 09:29 AM
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Yikes. Yeah. Put the stock intake back on there. Even if it's not the root cause of this issue (which it probably is), odds are it's reducing the engine's performance.

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Old 11-06-2018, 01:51 AM
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Originally Posted by Loki View Post
Yikes. Yeah. Put the stock intake back on there. Even if it's not the root cause of this issue (which it probably is), odds are it's reducing the engine's performance.

​​​​​
I legit have the same size air filter that comes with the AEM one and the car dies when the intake is routed outside the car (its located in the engine bay atm).
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Old 11-06-2018, 02:00 AM
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theres more to our intakes as others have mentioned. placement of maf, daimeter, screens in the tube. vac lines etc. return it to stock.
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Old 11-06-2018, 07:39 AM
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Originally Posted by Darius Obo Thomas View Post
I legit have the same size air filter that comes with the AEM one and the car dies when the intake is routed outside the car (its located in the engine bay atm).
Ah. So a hot air intake then
Do you, for example, have the airflow strightener screens before the MAF? Small things that make a big difference.
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Old 11-06-2018, 08:08 AM
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Dude, put the OEM intake back in. It's better than anything you've fabricobbled together.

You need to smooth and homogenize the airflow before it goes across the MAF.
You need to consider the Helmholtz tuning Mazda exploit to improve performance.
You should to pull air in from outside the engine bay if you care about intake air temperature (though, as you say, this is unlikely to be the cause of your problem).

Do some data logging and post your MAF rate, STFT, LTFT, IAT and RPM. I'd bet you have some really wacky MAF numbers and fuel trims.
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Old 11-06-2018, 08:32 AM
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