2001 Protege 2.0 random misfire - symptoms
- Thread starter rtrussel
- Start date
Swapped the injectors, replaced the o rings on each of them, and then had a rough idles when I started it up. Checked everything, no leaks, and everything was plugged in.
Would the air in the dampner cause it to have a rough idle?
I pulled the EGR again and cleaned and oiled it. It moves freely.
Dang it!
Otherwise it drives fine.
Plus I was working out in the garage with the heater on and it was 37 degrees. It was 5 degrees outside. 37 never felt so good.
Would the air in the dampner cause it to have a rough idle?
I pulled the EGR again and cleaned and oiled it. It moves freely.
Dang it!
Otherwise it drives fine.
Plus I was working out in the garage with the heater on and it was 37 degrees. It was 5 degrees outside. 37 never felt so good.
So far, after replacing #3 on Sat, I have had the CEL come on but only once.
It ran extremely smooth for the test drive that night.
Running smooth today so far, but I'm going to ride it out to see if it lasts.
I do have somewhat of a rough idle as well, but its not really all that bad.
We'll see what happens.
Have yet to check my plug wires, and also the EGR.
It ran extremely smooth for the test drive that night.
Running smooth today so far, but I'm going to ride it out to see if it lasts.
I do have somewhat of a rough idle as well, but its not really all that bad.
We'll see what happens.
Have yet to check my plug wires, and also the EGR.
I always unplug the negative battery terminal. With other issues it will usually come back on within 150 miles. My car doesn't show any issues until a half a tank. Other than the jacked up idle it has now. It isn't bad while driving but almost dies when I am sitting still. Didn't do that before I swapped injectors.....
http://www.mazdas247.com/forum/showthread.php?p=4267533&posted=1#post4267533
Two threads, same issues.
Two threads, same issues.
Lets go with a hell no on the IAC. Four phillips holding it in. The manual shows one bolt..... Those blasted screws are in there like swimwear. I really didn't feel like stripping anymore screws so I pulled the intake and cleaned the TB. Pulled the plugs and cleaned the soot off. Checked the gap and reinstalled.
Got gas this morning and put some injector cleaner in. When I got to work it idled great and didn't bog down. Now to see about the half tank issue. Will most likely put on some mileage this week with the holidays and the brother in laws loving to hit some country roads while they are in town.
Someone in another thread talked about spraying air into the feed line of the fuel pump to clean out buildup. I presume it cleans it from the nonserviceable high pressure filter.
Here is the post. http://www.mazdas247.com/forum/showpost.php?p=4266842&postcount=55
Alright, well that gives me a few more options.
I may just have to try cleaning out that fuel filter as well.
Haven't tried switching the injectors, or any cleaner, but after I replaced the #3 last Sat, after that initial CEL, it hasn't come on again yet.
Will wait to see what happens after my trip to MO this next Sunday.
I may just have to try cleaning out that fuel filter as well.
Haven't tried switching the injectors, or any cleaner, but after I replaced the #3 last Sat, after that initial CEL, it hasn't come on again yet.
Will wait to see what happens after my trip to MO this next Sunday.
What are your symptoms?
Try the free stuff. Clean the TB, fuel filter, EGR, clean the plugs and check the gap, clean the MAF.
I have to wait for my gas to drop to a half a tank and see if the code comes back. The injectors are swpapped. Hopefully the code will change to P0302
Well, I was actually just idling at the light, and it went on.
The idle has been pretty inconsistent lately though. Roughly between 1000 and 200 rpm at a stop.
Sometimes I think it it's going to just die altogether.
It is a 5speed tranny.
I was thinking I'd clean out a few things for sure. That may just be my problem. And yea, if swapping the injector fixes/changes the code for you, let me know and I'll get you a new one.
The idle has been pretty inconsistent lately though. Roughly between 1000 and 200 rpm at a stop.
Sometimes I think it it's going to just die altogether.
It is a 5speed tranny.
I was thinking I'd clean out a few things for sure. That may just be my problem. And yea, if swapping the injector fixes/changes the code for you, let me know and I'll get you a new one.
Throttle body.
Remove your intake and unhook your battery. Pull the throttle cable back so the throttle body plate will open. You can spray throttle body cleaner and use a toothbrush or you can dip the brush in gasoline to clean it. Hook it all back up, it will be difficult to start but it will clean the carbon build up out. Then turn it off and pull the plugs. Whipe them off and hit them up with a wire brush to clean the carbon build up from the TB clean that you just did. Increased gas mileage, improved throttle response, and took care of that idle issue at stop lights.
(2thumbs)
Remove your intake and unhook your battery. Pull the throttle cable back so the throttle body plate will open. You can spray throttle body cleaner and use a toothbrush or you can dip the brush in gasoline to clean it. Hook it all back up, it will be difficult to start but it will clean the carbon build up out. Then turn it off and pull the plugs. Whipe them off and hit them up with a wire brush to clean the carbon build up from the TB clean that you just did. Increased gas mileage, improved throttle response, and took care of that idle issue at stop lights.
(2thumbs)
Last edited:
cards-gotta-go
Member
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- Mazda, Protege LX 2.0, 2001
As it turns out, the head gasket was toast and I hade to replace a cylinder head (#4).
Total cost at my dealer $3,004.28. (puke)
same problems as this gentleman.
I have the same problem as this gentleman, a mazda 2001 bought in Canada, now in California which gave the same codes, po300 and po421. changed the ox sensors but the light came back only 30 miles after. everything is normal, idle, acceleration, etc, occasionally, very rarely missfired. and normally the light comes without any symptom, just lights up. any ideas???
thansk you..
I have the same problem as this gentleman, a mazda 2001 bought in Canada, now in California which gave the same codes, po300 and po421. changed the ox sensors but the light came back only 30 miles after. everything is normal, idle, acceleration, etc, occasionally, very rarely missfired. and normally the light comes without any symptom, just lights up. any ideas???
thansk you..
