Question about 1990 Nissan Stanza
KA24E 2.4L engine
Idles at 3-400rpms wont accelerate smoothly although if you press the accelerator slowly you can hold the accelerator at a place where it will rev up past idle then you can get it up past 2000 rpms
Have replaced the spark plug wires, plugs, cap and rotor, fuel and air filters, engine coolant sensor, fuel pressure regulator, throttle position sensor, fuel hoses, egr valve gasket, intake manifold and plenum gasskets, most of the vacuum hoses, pcv valve
Have cleaned and tested MAF sensor, Air temps sensor, IACV, AAV, EGRC -BPT valve, EGR valve, PAIR valve, scv valves and solenoid,throttle valve, vehicle speed sensor, fuel pump and tank filter, pumped out all gas and filled with fresh gas. Removed exhaust pipe from header and operated to rule out restriction.
I'm getting no codes, but the computer seems to be working because i can disconnect the various sensors and get it to throw the proper codes.
I have two questions to ask someone who knows:
1. Some times when the ignition is on while the engine is off , there is a buzing sound. it goes away when i move the throttle lever. Ihave a stethoscope and the sound seems to be coming from the transmission.
Is this normal it doesnt seem so.
2. When testing the power transistor- the manual sez you should have infinity between terminals a and b, and a and c, but neither infinity or zero between b and c. what if you have a momentary reading, 120 to 180 ohms, then it goes to infinity? is the tranistor good? it costs $120, so i need to be sure.
remove the front 02sensor and drive the car like that, remove means complety take it apart from exaust, if problem goes away or gets so much better then your catalitic converter at the exaust is restricted and need a new one
Posted on Jun 19, 2008
check aux air control valve , thats what controls the idle it may be bad,also with that kind of mileage i would replace the mass air flow sensor ,do that first, good luck , the mass air flow sensor has alot to do with your gas mileage .
Posted on Nov 07, 2009
check timing make sure it;s ok . second check your exhaust system if it;s close , start accilerate for 3 min. then look all exhaust pipe (silencer) if there is difrent coler . check Oxgen sensor it;s ok .
and if you have no enough fuel presure try close the return line temporary . maf, sensor only when there it is highand low accilerator.
Posted on Jun 23, 2011
Check the condition of the plugs you have installed. See if you can find one which has an irregular color. The spark plug should be dry and brown in color. The problem could be just in one or a few cylinders. More than one cylinder may mean a problem with the ignition coil. If it were just one we can isolate it into the components connected to the cylinder.
If you have the SES light on as well, it may be a bad O2 sensor or a bad catalytic converter. Check for the wiring that goes to the O2 sensor. The computer may not be getting the correct reading on how much fuel burned causing the misfire.
Posted on Jul 18, 2011
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