Engine Jumping and RPM Bouncing.
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Old May 26th, 2009, 10:35 PM   #1
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Car jerking when at full stop, rpm jump up and down.


Hello All.

Ok after I sea foamed, tuned up, and changed oil on my car. The car starting to jerk when at full stop and the rpm jump up and down. when driving I can feel it too but not as much. When I put my ear next to the exhaust from the back I can hear like popping sound but very low like "boom" "boom". when sitting in the driver seat I can feel that boom coming out. But again its not like the farts that the civics make its a very low popping sound.


what should I do?

Could it be the seafoam? I injected the seafoam in the engine through the vacuum hose. I also put seafoam in the gas. I also had seafoam in the oil but I changed the oil.

The car is
03 V6 Mustang Convertible. 70,000K Stock.
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Old May 27th, 2009, 01:21 AM   #2
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Prolly the gas, prolly.... now about the rpms jumping might be the maf sensor, iac or tps.
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Old May 27th, 2009, 08:32 PM   #3
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ok now the tank is almost empty and it shakes more and the rpm jumps more. It goes down to 500 and it feel like its about to shut. Also service engine soon came on but I reset the battery and it came off.

Can this be the seafoam that I put in the gas tank?
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Old May 27th, 2009, 08:33 PM   #4
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That's what I think, if you have low fuel then try putting some more..
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Old May 27th, 2009, 08:50 PM   #5
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I am trying to follow the direction on the seafoam. It says let the tank empty before refilling. I will drive the car tomorrow and finish all the gas up. I hope refilling the tank will fix the problem. Should I buy any of those gas tank cleaner or injector cleaner stuff?
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Old May 27th, 2009, 08:52 PM   #6
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I don't think so, that's why you used the seafoam.... try after the new gas
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Old May 27th, 2009, 08:55 PM   #7
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ok thanks alot. do you have any article that says anything about seafoam causing this?
lol just want to fix this problem before the weekend.
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Old May 27th, 2009, 08:56 PM   #8
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There's a good sticky on Allfordmustangs.com, if you can't find it let me know..
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Old May 27th, 2009, 09:01 PM   #9
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BY: mac_mogul FROM allfordmustangs.com "Seafoam does alot of things. It helps unsticky those sticky lifters, it'll take water out of your engine, it cleans your injectors, it cleans the gunk out of the intake manifold, gets the carbon out of the exhaust system, and overall will increase throttle response by a noticeable bit. Its a great product and I recommend using it every 5-10,000 miles depending on your driving habits."
So maybe the seafoam is getting water out from the engine/tank and thats why its doing that?

is that what u was talking about? if not please link.
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Old May 27th, 2009, 09:07 PM   #10
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Seafoaming My Mustang - Ford Mustang Forums
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Old May 27th, 2009, 09:32 PM   #11
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yeah that was what I was looking for lol. Thanks a lot I guess I will just wait till tomorrow.
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Old May 27th, 2009, 09:33 PM   #12
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Old May 27th, 2009, 09:58 PM   #13
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You were supposed to wait until you had half a tank or a quarter(doesnt matter too much) and add 1/3 of the can of seafoam into the tank, and then fill it up immediately after(thus mixing everything together). Did you add gas with it or did you run your tank empty and dump the seafoam in there without topping off the tank?
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Old May 28th, 2009, 08:57 AM   #14
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no I filled up full tank before I put the seafoam in. Its almost done now I am just waiting for the low fuel light to come on.
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Old May 28th, 2009, 02:50 PM   #15
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make sure each spark plug wire goes to the correct spark plug.
i cannot stress this out enough!
even if you think you are sure. (refering to tune up if you did this change)
DOUBLE CHECK!

AND

make sure your vacuum hoses ARE CONNECTED AND NOT TORE.
the sea foam would'nt cause the problem you are describing.
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Old May 28th, 2009, 10:37 PM   #16
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is there any picture online that shows where each spark plug suppose to go. I am sure I have them right because I changed one at a time.
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Old May 29th, 2009, 02:16 AM   #17
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the seafoam shouldnt be causing this at all. Rule of thumb is 1ounce to 1 gallon. So if you want to, as you are sitting at the gas station with a low tank, pour a full can and then put your gas in and that will mix it up well.

sounds like a vacuum hose may have come loose possibly?
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Old May 29th, 2009, 08:53 AM   #18
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well are you talking about the one next to the brake fluid? I checked it its good. This is where I injected the seafoam .
I filled up the tank now and its still doing it.
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Old May 29th, 2009, 01:48 PM   #19
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Originally Posted by chaaase View Post
make sure each spark plug wire goes to the correct spark plug.
i cannot stress this out enough!
even if you think you are sure. (refering to tune up if you did this change)
DOUBLE CHECK!

AND

make sure your vacuum hoses ARE CONNECTED AND NOT TORE.
the sea foam would'nt cause the problem you are describing.
you are 100% right it was the tuneup #6. I went to the mechanic he put the computer reader and it said tuneup.
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Old May 30th, 2009, 06:21 PM   #20
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i had the same problem,so i took it to the ford dealership and it turned out to be a cam problem with the cam censor and something else.
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