check engine light at idle after throttle body cleaning

[harimon21]

my ride is lancer 91 efi. i cleaned the throttle body and the throttle valve. but after replacing everything after cleaning, check engine light appears during idle. resetting the ecu does not help either. it seemed na parang tumaas din and idel setting, because the car moves as soon as i released the clutch without stepping on the gas. this has been going on for 2 weeks now. what could be the cause? have i damaged anything during cleaning? any ideas?

[kinyo]

make sure you returned all sensor connections properly, especially the MAP and MAF sensors

[harimon21]

thanks for the reply. yung bang sensors e yung nakakabit malapit sa throttle body?

[speedyfix]

yup, check the sensors muna. malamang dun lang problem... or else baka a vacuum line na mali kabit.

[norrissee]

Try to have a shop read your CEL code. Chances are this will help you a lot in tracking down what's wrong.

Or check if your car has one of these:



If you have that you can use a DC tester to connect to the OBD output terminal (usually pin 1 sa ECU) and count the "waves" (voltage) it makes. Connect the positive sa tester mo to the pin and ground the ground. Long "waves" is counted as 10s and short "waves" as 1s.

Example: (L - Long, S - Short)
L, L, S, S, S, S = 24

Here are the CEL codes for a OBDI 1991 Mitsu Engine:

11 Heated oxygen sensor.
12 Air Flow Sensor.
13 Intake Air Temperature Sensor.
14 Throttle Position Sensor.
21 Engine Coolant Temperature Sensor.
22 Crankshaft Position Sensor.
23 Camshaft Position Sensor.
24 Vehicle Speed Sensor.
25 Barometric Pressure Sensor.
41 Injector.
42 Fuel Pump.
43 EGR (California only).
44 Ignition coil/Power transistor unit.

This helped me enormously in tracking down the CEL I had with my mitsu. Hope it can help you as well.

[harimon21]

thanks norrissee, will check try your instructions this weekend... hope it works