My car is a 91 CRX si with bolt-ons, yesterday I crank it up and the idle gose up and down from 1700 rpms to 500 and back over and over. it seems to run fine untill you let it ldle and it dose the same thing. I don't what could be going on. Dose anybody have any Ideas??

 

it seems like alot of people have idle problems..maybe you need a tune-up,maybe you have a leak at your throttle body or intake manifold gasket,maybe a vacum line has a crack or is disconnected,maybe your timing is off,maybe you need a new fuel filter or maybe some new spark plugs,maybe a new dis cap/rotor,maybe its something electrical,like a fuse/wire/ground..etc.

 

This might help, Check you Ecu see how many times it blinks and than compare it to the fallowing:

Code 0 _____ Faulty ECU
Code 1 _____ Oxygen content
Code 2 _____ Does not appear to exist
Code 3 _____ MAP sensor
Code 4 _____ Crank angle sensor
Code 5 _____ MAP sensor again
Code 6 _____ Coolant temperature
Code 7 _____ Throttle angle
Code 8 _____ Top dead center sensor
Code 9 _____ No. 1 cylinder position (only on 1.6L)
Code 10 ____ Intake air temperature
Code 11 ____ Does not appear to exist
Code 12 ____ Exhaust gas recirculation system
Code 13 ____ Atmosphric Pressure
Code 14 ____ Electronic air control (EACV)
Code 15 ____ Ignition output signal
Code 16 ____ Fuel injector
Code 17 ____ Vehicle speed sensor
Code 18 ____ Does not appear to exist
Code 19 ____ Lock up control solenoid (auto trans only)
Code 20 ____ Electric load

Hope that helps

 

Man thanks a million. It is the Map sensor.