Tie Ee Fei

Hi everyone. Sorry if my questions look stupid ( A Newbie Civic Onwer here)

I just own a So4 (EJ6) with B20B B16Head (Now with auto Gearbox Duhhhh...) <===== Going to manual at the future
Its a fun and powerfully little car to drives ... gonna love when the V-tec Kickin yo.. hhaha.. well let goes back to my questions ..

i have a problem As the title said . When i Turn on the aircorn the Rpm will goes up and down. especially when you put the gear to P or N. it will goes away sometimes when in D.. and sometimes it will goes away if i turn on the AC.
what shall i check ? the throttle body ? some people say its may cause by (air-corn Choke) .
would like to heard advices from expert here :D

Thanks
Any reply in this would be highly appreciated

Tq

mk378

You bought an already swapped car-- in many cases the previous owner didn't build it out properly and doesn't know how to fix it. Eventually he gets frustrated and puts it up for sale.

Also the A/C will overload and bog the engine if the condenser fan doesn't work. So check that first.

Tie Ee Fei

The condenser fan will work when the engine are hot.. It turn on automatically.. My aircorn are very very cold..

I will get back. To the pervious owner soon. But before that i would like to troubleshoot 1st. 🙂

tony_2018

check engine light? what ecu?

Tie Ee Fei

No engine light..
P28 now.

(previously stock ecu also have same symptoms)

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tony_2018

Does the check engine light works?

Tie Ee Fei

Yes. it run fine no other problem... only the RPM high and low thingy ( more noticeable when AC on with N or P) it just goes away when driving.. (D or D1, D2 ,D3 or D4)
thinking buying a OBD tools for check...

TomCat39

When asked if check engine light works, are you confirming the light comes on for 2 seconds and turns off when you go to start the car?

You have seen the check engine light come on for a moment before starting the car? Or you never see the check engine light come on, ever?

Tie Ee Fei

Will double comfirm tomorrow.. I think there is a high changes that check engine light is nt working.

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mk378

To be clear, turn the key from off to the on position, but not all the way to make the engine start. The CEL should come on for a bulb test and then go out after 2 seconds.

OBDII scanners do not work with a P28 or other OBD1 ECU.

Tie Ee Fei

Here... The engine light is working..



Yes . The engine light is working.

Tie Ee Fei

Thanks for the advices.. Anyway here is the engine light. Is cel will comeout and go out after two second..

The cel is working too.