Hesitation in the RPMs - Mustang Evolution

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Old 05-29-2012, 08:08 PM   #1
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Hesitation in the RPMs

K so once I put plugs and a oil change on my well over due lx. I have noticed a hesitation ( like someone is taping the braks) an obvious power loss btwn 2500- 4000RPM then it picks back up like I've put te jug to it. Could this be a back pressure issue bc I have 3in exhaust that's cut off right at the rear axle. On a NA motor
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Old 05-29-2012, 08:39 PM   #2
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I doubt it. I k.ow plenty of guys that run 3" exhaust with no problems. For the most part a lot of what you hear in back pressure is a myth. You may loose a little lowend torque but will make it up in the higher rpms.

Did this happen exactly when you did this tuneup? You may have knocked something loose or need to reset timing?
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Old 05-29-2012, 08:59 PM   #3
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Not an issue with the exhaust. If you got hesitation, I would check the plugs and see if you have a fouled plug.
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Old 05-29-2012, 09:11 PM   #4
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Quote:
Originally Posted by aegischief
Not an issue with the exhaust. If you got hesitation, I would check the plugs and see if you have a fouled plug.
If the plugs check out fine you might want to check the whole ignition system with an ignition scope to make sure there's no problems in your primary and secondary ignition
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Old 05-29-2012, 09:12 PM   #5
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Quote:
Originally Posted by SSC182

If the plugs check out fine you might want to check the whole ignition system with an ignition scope to make sure there's no problems in your primary and secondary ignition
+1
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Old 05-29-2012, 09:18 PM   #6
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May have a made distributor or coil, I had a issue where I couldn't rev or go pass 3500rpms turned out to be my distributor !
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Old 05-29-2012, 09:20 PM   #7
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Well b4 the oil change and plugs it ran rough but btwn 3500 an 4000 rpm u can feel a big power gain With the gears it has plenty of low end I think once I did te oil and stuff it's more noticeable I'll check tho timing and see what it's like. It's got a msd cap
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Old 05-29-2012, 09:21 PM   #8
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Yeah it could be but if you want to know for sure hook up an ignition scope that way you wont just be throwing parts at it that may or may not fix it save some money and alot of frustration that way
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Old 05-30-2012, 05:33 PM   #9
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Timing looks good pulled the plugs and seems like number 1 is getting more gas then the others. The others r burning right but 1 has gas on it. Could that be the O2 sensors
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Old 05-30-2012, 08:03 PM   #10
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the o2 will not have affect on only one injector. you may have a problem with the injector itself. or a problem with spark on that cylinder?
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Old 05-30-2012, 10:03 PM   #11
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Gotcha
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Old 05-30-2012, 10:11 PM   #12
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Re: Hesitation in the RPMs

Swap out that injector with another cylinder's injector and see if the problem moves. If it does then the injector is probably sticking.
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Old 05-31-2012, 09:32 AM   #13
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Swap out that injector with another cylinder's injector and see if the problem moves. If it does then the injector is probably sticking.
That's a darn good idea. Why didn't I think of that.
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Old 05-31-2012, 09:55 AM   #14
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I was thinking the same damn thing
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Old 05-31-2012, 02:22 PM   #15
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Re: Hesitation in the RPMs

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Originally Posted by dreamstang View Post
That's a darn good idea. Why didn't I think of that.
Po' Boy Diagnostics Inc. - Use what you have to do the best you can do.
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Old 05-31-2012, 03:55 PM   #16
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Po' Boy Diagnostics Inc. - Use what you have to do the best you can do.
Lol....That is the ultimate goal of us diy guys.
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Old 05-31-2012, 04:38 PM   #17
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Re: Hesitation in the RPMs

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Lol....That is the ultimate goal of us diy guys.
Yes, our motto.
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