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Old 03-09-2011, 07:15 AM   #1
morgan46
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Unhappy Sputtering on low RPMs

hey guys just noticed something wrong with the focus, at low RPMs(0-2900ish) my car will spit and sputter and jolt badly, but once it hits 2800/2900 it'll run fine. it mainly does it when it is cold and when it is first started, but it is getting worse. *PLEASE HELP!!


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Old 03-09-2011, 01:00 PM   #2
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When was the last time you've done a tune up on the car? Any CEL to point you in a certain direction? I usually let my car warm up for a few minutes before driving or it fights me a little bit haha.
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Old 03-09-2011, 03:43 PM   #3
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Sounds like the runners are not switching over and are stuck in the high rpm setting.
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Old 03-09-2011, 04:59 PM   #4
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I just had this exact problem start with my car a couple day's ago. With mine it was a vacuum leak issue. Turns out that just below the throttle body on the intake manifold there is a vacuum fitting and line that apparently vent's pressure from the fuel tank. The fitting on the intake manifold busted loose or something so the line was loose and created a huge vacuum leak. I plugged the fitting with a rubber cap for now and the idle returned to normal and I suppose the fuel tank is just venting to the atmosphere now, which should trigger a CEL but it hasn't yet. I don't know yet what to do about that fitting and vacuum line, I'm going to jerry rig something but the bottom line is that the manifold itself is kind of busted.
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Old 03-09-2011, 08:46 PM   #5
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yeah, i do let my car warm up before i leave (ten-ish minutes) but the weird part is that it will idle fine. it only happens when you give it gas.. but after its been running a while (and isnt really cold) it will run fine! but when its not... its like riding a buckin-bronco. Im throwing it up on the lift saturday anyways (i noticed a strange puddle in the passenger side, i think there might be a hole somewhere) and i will ask my boss (i work at a shop) if he could help me look at it. but thank you, i will check out the throttle body.
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Old 03-09-2011, 08:47 PM   #6
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Quote:
Originally Posted by vaboom123 View Post
When was the last time you've done a tune up on the car? Any CEL to point you in a certain direction? I usually let my car warm up for a few minutes before driving or it fights me a little bit haha.
i have actually never done a tune... i am saving up money for it as we speak. that and a larger throttle body, and maybe a full borla exhaust system.
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Old 03-15-2011, 10:23 PM   #7
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Is it a bucking at a certian RPM while driving down the road?
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Old 03-16-2011, 08:12 AM   #8
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Quote:
Originally Posted by cdsilver02 View Post
Is it a bucking at a certian RPM while driving down the road?
it'll buck from 0-around 2700. after that, it runs fine-ish.
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Old 03-16-2011, 09:21 AM   #9
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Mine does it too, I have heard of many people complaining about it, and I think it somthing in the tune. Mine is not as bad now since I have installed an aftermarket flywheel.
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Old 03-16-2011, 08:09 PM   #10
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Quote:
Originally Posted by edingeek View Post
Sounds like the runners are not switching over and are stuck in the high rpm setting.
...or possibly the timing belt.
I wouldn't rule out the vacuum either, but it's not the first place I would look.
If there's an engine code, check it out. Most parts stores offer some sort of free-ish service for reading codes, or you can pay $70 at the dealership which will go toward repairs instead if you have it serviced there, depending on what it is.
If it's just the timing belt then I would say let the dealers do it. They're familiar with the car and it isn't usually too expensive.


Quote:
Originally Posted by morgan46 View Post
i have actually never done a tune... i am saving up money for it as we speak. that and a larger throttle body, and maybe a full borla exhaust system.
I'm pretty sure he's talking about a 'tune-up', Plugs/wires, filters, sensors etc - not an aftermarket 'tune'.
timing belt's are due at 60k mi. I've seen them start to go sooner (~46k) if the car was driven spiritedly. ~.^


Quote:
Originally Posted by cdsilver02 View Post
Mine does it too, I have heard of many people complaining about it, and I think it somthing in the tune. Mine is not as bad now since I have installed an aftermarket flywheel.
'Bucking' isn't really a characteristic of the stock tune, hehe.
You're probably thinking of the 'surging' issue which is just an inconsistent power band caused by a mediocre timing program, which IS a characteristic.
Another common complaint about the stock tune is a lack of power in the low RPM's(<1800) which isn't quite like what morgan is describing.


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