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Old 07-27-2013, 03:33 PM   #1
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need help

Hey guys let's say I'm cruising, and I will be in 3rd gear at 1300 rpms going around 30, my car starts to jump and skip,keep in mind I'm steady on the accelerator, whenever I go above 1500 rpms it stops and runs smooth as ever, anyone know why it's doing this?
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Old 07-27-2013, 03:55 PM   #2
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Misfire?
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Old 07-27-2013, 05:15 PM   #3
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Idle good?
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Old 07-27-2013, 05:36 PM   #4
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Yea my idles have been pretty fine actually
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Old 07-27-2013, 10:34 PM   #5
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Flaky coil
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Old 07-28-2013, 05:27 PM   #6
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Might just be because you are lugging it too much. I would never cruise at 1300 honestly. I generally like to keep the RPM at LEAST 1500+ and that has been the case with every Mustang I've had.
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Old 07-28-2013, 06:33 PM   #7
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Might just be because you are lugging it too much. I would never cruise at 1300 honestly. I generally like to keep the RPM at LEAST 1500+ and that has been the case with every Mustang I've had.
Cruising at low rpms is bad?
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Old 07-28-2013, 06:54 PM   #8
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Yeah it's just bogging down
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Old 07-28-2013, 06:56 PM   #9
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Cruising at low rpms is bad?
You should keep the RPMs up at least above 1600, I try to keep them above 1800 honestly. I would NOT cruise around at 1300 ever, its hell on your bearings if nothing else.
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Old 07-28-2013, 06:57 PM   #10
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Cruising at low rpms is bad?

Yes, it's bad.
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Old 07-28-2013, 08:04 PM   #11
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You should keep the RPMs up at least above 1600, I try to keep them above 1800 honestly. I would NOT cruise around at 1300 ever, its hell on your bearings if nothing else.
OGod I thought I was being good to it lmao
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Old 07-28-2013, 08:07 PM   #12
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Imagine riding a 21 speed bike when you were younger. Now imagine riding around slowly in 21st gear. That's what you are doing to your rotating assembly.
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Old 07-30-2013, 09:43 AM   #13
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Well said, I cruise through town at 50mph at 2k in fourth
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Old 07-30-2013, 12:33 PM   #14
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And on top of the extra wear and tear on the motor, while it's working harder to lug you around you're killing your fuel economy. A common misconception is that lower rpms = better mpg which is completely false.
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Old 07-30-2013, 12:46 PM   #15
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And on top of the extra wear and tear on the motor, while it's working harder to lug you around you're killing your fuel economy. A common misconception is that lower rpms = better mpg which is completely false.
Wow that's actually what I was trying to do, I suppose that is why I have such low mpg right now, this is blowing my mind I always thought I was taking it easy on my car lol
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Old 07-30-2013, 12:58 PM   #16
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1800-2300 rpms under no load is where your best fuel economy will be. But as I said, it's not just rpm, it's also load/vacuum etc that all play a part. If I'm going for fuel economy I set my cruise at 73 (~2250rpms) and on flat ground I pull almost 19in/hg vacuum and I get 21-23mpg on the highway depending on the terrain. That's on a blown GT that puts down 420hp.
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Old 08-03-2013, 09:40 AM   #17
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The symptoms have been getting worse I think it's misfiring, u can even hear it in the exhaust, it Sounds like it's skipping a cylinder, especially when I press the gas hard, think I need new spark plugs
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Old 08-04-2013, 12:22 AM   #18
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The symptoms have been getting worse I think it's misfiring, u can even hear it in the exhaust, it Sounds like it's skipping a cylinder, especially when I press the gas hard, think I need new spark plugs
How many miles? Spark plugs been done before? If not and the mileage is getting up near 100k (or over) its time for new COPs too. Sucks that each COP is around $42 and you need 8... Only buy OEM Ford ones as well, the aftermarket ones are all very inferior to the Ford stuff.

ALSO, make damn sure you have a good 1/4" drive torque wrench when you do the plugs and torque to 12 ft lbs when you install the plugs, make sure to use anti seize too.
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Old 10-01-2013, 01:18 PM   #19
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It was the spark plugs lol
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