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Some problem

 
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Old 12-07-2009, 01:02 PM
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Some problem

So, a couple days ago my car f-ed up, a 97 Base 5-speed. My check engine light was flashing and got the code ran, cylinder three misfire. Alright, got home, checked the plugs and wires, everything fine. I clear the code and leave for work, but on my way, any time I start to just cruise at a constant throttle theres a rapid popping in my exhaust. I changed the fuel filter, nothing. I change the plugs, nothing.

What else could possibly be making my 3rd cylinder misfire like that. I also took out the plugs with less than 100 miles on them. 3 checked out fine, the 3rd cylinder plug was covered with black soot. Like this (On the left):



I know I haven't been on here for a while but I think you guys can help me.
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Old 12-07-2009, 02:28 PM
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Re: Some problem

HEY : bro ,check your timing ,your coil and distributor ,Most likely your distributor module inside could be bad .
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Old 12-08-2009, 11:42 AM
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Re: Some problem

I tried the cap and rotor, nothing changed. I am at a loss now, I have covered all possible fuel and spark problems, what else is there?
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Old 12-08-2009, 12:33 PM
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Re: Some problem

u check ur o2 senors just a guess, theres two
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Old 12-08-2009, 12:37 PM
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Re: Some problem

No, but maybe I should.
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Old 12-08-2009, 01:55 PM
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Re: Some problem

did you change your wires??? maybe you have just one broken or bad wire.
switch wire number 3 w/ another wire probably four just remember to switch on distributor and motor side. this way you can check the spark plug afterwards. now if you just changed these wires then you have a defective wire. its happened to me tons of times.
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Old 12-08-2009, 02:07 PM
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Re: Some problem

Hey : bro .you need to check the firing order of wires on the cap, and your injectors ,the foul plug looks of signs of not firing ,could be bad coil ,or injector hung up ,Make sure you check the spark wires carefully for good resistance and try to borrow some ones coil to make sure the coil is good the coil could work at crusing speed and when is hot will loose some current ,wile driving hard .Some times wires look good but don't have contunuity .Try cleaning your injectors put some cleaning solution in the tank with some good octane ratting .you might need to do direct cleaning of the injectors, and that is a little tricky if done wrong you can vapor lock the engine .That needs to be done by some who knows like shop, or if your up to it then get some instructions do it your self its not hard.Keep posting on the problem .Hit me up for more info .Ps what where the codes that you got ?Later JOHN
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Old 12-08-2009, 02:32 PM
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Re: Some problem

I think I'm gonna try plug wires next, cause when I changed the distributor cap the 3rd cylinder wire looked a bit funny. If that doesn't work ill go to distributor.

Also the only code I got was a p0303.
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Old 12-08-2009, 07:21 PM
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Re: Some problem

misfire on cylinder 3... either bad wire or bad connection in cap to rotor.
JOHNL ...just discussing ideas not arguing with you but in this circumstance i don't thing it has nothing to do w/ firing order, injector, or bad coil.
firing order the car will stall out or run extremely rough and foul all plugs.
injector... the plug would be clean no soot
coil ... none of the plugs would be firing
90% your wire.
what you can also do ... while running pull a wire out from the top of the cylinder slowly. you will hear the clicking noise of the spark from the wire to the plug. do that to each cylinder ...most likely you won't have it on cylinder three. to verify JOHNL's idea of injector.... unplug each injector one by one and see if the firing gets worse or better.
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Old 12-08-2009, 08:05 PM
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Re: Some problem

Thats why I was hesitatant to say it was an injector or fuel problem, cause if the cylinder is burning rich it has to have alot of fuel in it or at least not able to get all the fuel that is in it to burn. I thought it was fuel at first cause I took out the spark plug and it looked clean but I guess not.
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Old 12-08-2009, 09:16 PM
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Re: Some problem

Weird looking plugs. Is that the right heat range? I don't remember. (edit: ah, I see, the plugs have less than 100 miles on them - then it's ok the one on the left looks so fresh...disregard that)

Ignition, fuel supply are valid places to look. EGR when it starts to clog up manifold ports can do funny things too - consider disabling it and seeing what happens (you'll throw an EGR cel). The part about steady state operation is why I say EGR...
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Old 12-08-2009, 09:36 PM
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Re: Some problem

^hey blue... read the post more careful... no egr code and no egr doesn't do that to a plug

psst and the code was p0303 misfire cylinder 3.
sorry but read the post. heat range what ???
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Old 12-09-2009, 12:43 AM
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Re: Some problem

Quote:
Originally Posted by Bustr View Post
^hey blue... read the post more careful... no egr code and no egr doesn't do that to a plug

psst and the code was p0303 misfire cylinder 3.
sorry but read the post. heat range what ???
It will only throw a EGR code if valve lift or overall EGR flow is not within parameters.

Could be lots of things. EGR is as simple to test as pulling the vac line. And it can definitely cause misfires.
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Old 12-09-2009, 04:50 PM
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Re: Some problem

I'll try the EGR valve after I have concluded its not the wires, cause like a dip-s I did not check the wires yet. Just for reference which vac line is it?
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Old 12-10-2009, 10:37 AM
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Re: Some problem

Well something between the cap, rotor and plug wires the problem has been fixed.
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