My factory 90 Civic has a problem that seems to become more pronounced after warmup. It hesitates / stumbles under light load acceleration at partial throttle. It operates great at idle, heavy loads, more advanced throttle. If the car is moving at higher speeds say 40 and above and I accelerate with partial throttle under any load conditions even light the problem will not ocur (I cannot under any operating conditions duplicate the problem at higher speeds).

I told my Mechanic about the problem before my recent smog check (which it passed, although pretty high on the Nox: he says I'll need a new convertor soon) He replaced the O2 sensor with a Bosch one and when I went to pick up the car showed me a computer fault code of 16, this we found under the passenger mat by counting the flashing lite. His manual lists that code as an open or shorted fuel injector and he suggests the lower injector is bad.

Is there a way I can be sure of the injectors condition before replacing it ? Should anything else be eliminated as a potential source for the problem before injector replacement ?

 

code 16 is an injector circuit problem- most likely 99% sure- this is a main relay problem. Or someone disconnected an injector or main relay with the key on. This relay will not cause a driveability problem- but usually a starting problem. I'm assuming you have a dx or an lx.


[Modified by fixhondas, 6:05 AM 7/24/2001]

 

Yeah your right it is a DX and it did have a starting problem but that seemed to go away after replacing rotor n' cap then when it still would'nt run the coil. Has been starting and running well since except for the stumbling.

Can you suggest what I might check-out next if not the injectors ?

 

try doing a sweep on your TPS- you say it has a stumble on partial throttle?

 

oh yeah- use ONLY HONDA parts- aftermarket stuff is junk! like your cap and rotor etc.

 

under light aceleration (with low vehicle speed and low engine rpms) it will stumble until the rpms come up a say 2,000 or better: its most noticable in second or third gear: I have a four speed. At higher vehicle speeds I can't reproduce the problem under any rpms or throttle position.


[Modified by JohnCBauman, 6:36 AM 7/24/2001]

 

im having the same problem with my hatch but i cant find out where the main relay is.. i know thats the problem the car isnt getting gas and its not letting the car start and it kills the battery can anyone help me out with a diagram or picture where the main relay is?