95 protege dx 1.5: idles rough, runs way too rich, and at a constant speed (any speed!), it will lurch and buck but as soon as either accelerate or decelerate, smooths out. only at any constant speed does it do this violent lurching. i've cleaned EGR, throttle body, had injectors ultrasonic cleaned, changed air and fuel filter, and still does it. maybe MAF sensor? any ideas appreciated.

 

did compression test yesterday, just to satisfy myself, and was 180 on all four cylinders. also put in new spark plugs. still got the problem.

been reading in the archives of several mazda forums and some say cleaning the EGR isn't enough, that you have to remove the throttle body and clean throughly the ports to the EGR. any thoughts on that? i did run a drill bit by hand into the ports to pull out any carbon, but do i have to remove the throttle body for more thorough cleaning?

oh,and plug wire are only 4K miles old from former owner.

 

OK, today obtained and cleaned with genuine MAF cleaner a used MAF sensor from salvage yard. it immediately fixed the problem. idled smooth, shifted smooth, drove like a new car and where before was blowing black smoke, now doesn't smoke at all . . . for a couple hours. i was elated and then on way home, felt a tiny drop in power, check engine light came on and now won't idle at stop at all when *under load*. Will idle fine and smooth until put in gear or until AC turned on, then becomes erratic and stalls out. But still no excess smoke at exhaust.

61 views of this post and no one has any advice? HELP!

 

what is the code it is giving? P1195?

 

OBD code #P1195: That code is for the EGR boost sensor. It has an open or a short in one of the wires.

But my suspicion, especially since the MAF cleaning temp solved the prob, is that you need a new MAF.

Remember please that a '95 is OBD, or OBD1, not an OBDII car. The codes will not likely be the same.