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Old 10-26-2013, 04:10 PM   #1 (permalink)
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Question Misfire Code - Rough Ride

My daughter 2007 Forenza manual transmission started a crazy problem which has a good idle and a very bad ride.
The car engine when in idle runs a kind of smooth with no vibration or any other apparent problem. When driving the car have the most rough ride like a car with misfire or when transmission is going bad. The engine light came flashing very fast. We stooped at the local Autozone and the problem code was "misfire" and also "dirty injectors". I replaced all four spark plugs and cables but the problem still the same. I added injector cleaner to the gas tank but it did not helped.
So I am stuck not knowing what to check next. This problem started suddenly.
I need your help.
Thanks
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Old 10-26-2013, 05:36 PM   #2 (permalink)
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ho. from your symptoms it sounds like your problem could possibly be the cam sensor. a few people on the forum have had similar problems when the cam sensor goes bad. if you look at the valve cover at the end of the row of spark plugs on the left there is a wire, thats the plug for the sensor. then theres a little door on the timing cover by the passenger side motor mount behind that is the sensor itself. i think you need a either a torx or hex socket to get the sensor out. i believe you unbolt it from the motor mount side than it comes out the top of the valve cover. let us know what you find out. any other questions just ask!
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Old 10-26-2013, 07:07 PM   #3 (permalink)
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I never heard about it before, it will be a new experience to me.
Only one question; the Autozone scanner should not give some code for this problem other than misfire and injectors?
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Old 10-27-2013, 08:52 PM   #4 (permalink)
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it will but only after the sensors dead. i think as long as its still working youll just get the missfire code. as for the dirty injector code im not positive. if the cam timing is off that could possibly mess with the injector cycle. i also wanted to tell you that injector cleaner is basically useless. the only way to clean the injectors is to remove them and run them through a machine made for cleaning injectors. the fuel pump isnt capable of the pressure needed to properly clean the injectors and if you put a solvent strong enough to clean them into your gas you would kill your motor. if you want them cleaned you should go to a mechanic and ask them if they have the machine to clean them. its also possible you have some crud in your gas tank and under load the pumps filter is getting clogged. maybe some went through the system and clogged an injector causing the dirty injector code. you probably should take it to a trusted mechanic who can check out a few things for you. keep us updated
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Old 10-27-2013, 09:22 PM   #5 (permalink)
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Today I took the car to O'reilly and check it again and the got the same codes but the guy who checked the car agreed with you that it is mostly sure that the problem is from camshaft sensor. I bought one which cost $56.00 and will replace it ASAP. When driving the car the symptom is really as one or more spark plugs are misfiring. The check gave also a code for random misfire. I agree with you that the cleaner is a waste money and I do not believe that it works the way that they say. After get the problem resolved I will let the site know it.
As I said before this will be the first time doing this kind of job and I will be very careful.
Thanks for your helpful support.
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Old 10-28-2013, 08:20 PM   #6 (permalink)
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I just started today removing covers and other parts necessary to replace my cam sensor.
I got almost done if not for the head ache to loose the screw that holds the sensor in place almost behind the gears of the cams. I tried many ways to get that loosen but could not get it done. I removed the time belt cover to see if make the job easier but the screw is in a location where we have only 1/2" or less to work with a star wrench. Finally I ended my day not having that screw removed. Since the belt cover was removed I will also replace the timing belt.
I need some help from someone in some other way to remove that bolt. I was even thinking in remove with a chisel and them install a new bolt with hex head.
Anyone have some better idea?
Thanks so much
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Old 10-29-2013, 05:39 PM   #7 (permalink)
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you should be able to get at it. did you try a socket wrench with a flex socket? might be easier to get at the bolt that way. or a t handle torx? like the one in the link below
T Handle Torx from Sears.com
i dont think i would take a chisel to it. then youd be stuck with a stud youd need to get out, that may be harder. this may sound silly but make sure your using the wright kind of socket. maybe it a hexhead and not a torx? hope this is of some help. keep us updated.
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Old 10-29-2013, 08:25 PM   #8 (permalink)
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I got the bolt removed and the new sensor installed.
After get everything back in place I drove the car to see the difference.
For my surprise the problem still the same. I was expecting to get my engine running like a champ but it din't happened. I got back to O'reilly to scan and got the same error: "random misfire". As it was night and I need to do something else I stopped and will search for some other opinions form this forum. My time belt is somewhat old and I don't know if it the error is something related with old belt probably making the cam running out of time.
Any suggestion is appreciated. Thanks to all.
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Old 10-30-2013, 07:35 AM   #9 (permalink)
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I'll bet money it's a blown head gasket. Are you losing any coolant? At the end mine was using about a quart every 50 miles. Never smoked out the tailpipe, never milked up the oil, but would use a quart to get to work and a quart to get home and sometimes twice that. If I left the cap loose on the coolant jug the system wouldn't pressurize, and the miss would go away but that's when it was using a quart per 50 miles. I couldn't imagine how much it'd use if the cap was tight. Have someone pressure test the cooling system and see if it holds pressure. If pressure leaks down but there's no leaks externally there's only one place it can be going, into the motor.

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Old 10-30-2013, 06:09 PM   #10 (permalink)
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Hei 7-Even:
You are absolutely right, I was trying to remove the screw under the sensor that probably is for sensor location and not t hold the sensor. I got that torx removed easily yesterday and replaced the sensor. As I said on the last post I was not luck and the car still running as it was before. Any other idea?
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