Hey guys, I have a H22a motor(auto) in my car. The problem is that my motor rpm drops down and then up, sounding like it's going to die for a bit and then not. This only happens on the "D" gears when I come to a complete stop sometime. I say it does this about 75% of the time. What could be the problem for this? Could it be that I need to clean my "fast idle control valve" and "Idle air control valve"? Help me out guys....

 

could be a bad front motor mount too

 

dirty or jammed EGR. You're having too much exhaust cycle back into the engine.

 

clean the fast idel valve and run some carb cleaner through the motor.

 

have u changed your pcv valve and oxygen sensor? if it does this all of the time change the pcv valve. i didnt realize when the dealer tuned up my car over the yrs that they never changed that part. i have a 92 4 dr lx and changed the original one last yr. im surprised i didnt blow some oil seals.

if it happens after the car warms up then its probably the 02 sensor. it cycles in an open default mode. this part can last several yrs in hondas. well over 100,000 miles. they get lazy at about 80,000mi. hondas have large ones compared to american made 02 sensors. a bit of a pain to remove too if its the original. im not familiar with a 93 se u may have 2 02 sensors. one on the exhaust manifold and the other farther down in the exhaust.

also does your tach jump. it could be the distributor, coil or ignitor.

 

x2, maybe use some Seafoam

 

It could be a vacuum leak. If you spray small amounts of starter fluid at certain spots and the engine speeds up, you have found the leak.

Check out the idle air valve.

Or it could be the throttle valve sensor sending faulty messages.

Your EGR system could be obstructed. Unplug it and see if the engine improves.

A faulty MAP sensor can have the same consequences.

Bad plugs, wires, cap, and rotor?

Plugged injectors can really cause problems. You can buy reconditioned ones for 1/4 the cost of new ones.

ETC., etc.

I have been going through the same sh** myself.

 

Its not the front motor mount because this happened after I replaced my front motor. Thanks for the idea.

 

Sorry...whats the EGR? Where can I locate that and check it?

 

Could be the MAP sensor... that solved it for me... dunno about urs tho...

But mine had similar "symptoms"