Can't rev when running

[madduck]

The engine can rev properly in idle.
Can't rev past 1800 RPM kapag paakyat ang road. Hindi tuloy makahatak.
Can't rev at all kapag naka ON ang aircon.
RPM drops kapag bumabagal.

Pleas help. Car is Sentra, GA16DNE.

[siopaonatoasted]

Fuel filter.

[madduck]

Changed my fuel filter last April.

[vinj]

Perhaps it could be MAF (Mass Air Flow) sensor issue. Try having your throttle body opened and cleaned along with the MAF sensor. A diagnostic engine scan should help.

[madduck]

I've cleaned the throttle body, last month, pero nilinis ko lang ng nakakabit pa. I'll clean MAF, thanks sir!

[oj88]

Sounds like it could be on limp mode. Is the CEL on? Have the engine computer checked for DTCs.

[jick.cejoco]

The engine can rev properly in idle.
Can't rev past 1800 RPM kapag paakyat ang road. Hindi tuloy makahatak.
Can't rev at all kapag naka ON ang aircon.
RPM drops kapag bumabagal.

Pleas help. Car is Sentra, GA16DNE.

what year is your car? how many miles? what was the last thing done to it? did the symptoms start after you refueled? is the exhaust system clogged? do you have throttle by wire? what is the engine vacuum measured at the intake manifold at idle speed?

[madduck]

it is when turning the key ON but it turns off after starting.
Where can I have the computer checked? Sa casa lang po ba available yan?

[lowslowbenz]

Sounds like it could be on limp mode. Is the CEL on? Have the engine computer checked for DTCs.

Yup, I'd agree on this one.

TS: Have your car scanned for trouble codes. Or try a hard reset, disconnect your negative cable from the battery for a few minutes, then reconnect. Then tell us what happened.

[jick.cejoco]

if the car is OBD II compliant, disconnecting the battery does nor erase the codes. it will be in the memory as history code. the only way to reset this kind of situation is to repair the cause of the problem and reset using the clear code function of the scan tool not a code reader alone