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Old 11-28-2010, 10:56 PM   #1
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Exclamation serious lack of power

hey guys...i have a 99 mustang 3.8L v6
recently i put in a k&N CAI and my IAC and MAF went bad...had those replaced due to my car idling really bad and shutting down on me...i just got the car like 3 months ago...even tough worse is fixed i feel a reallll lack of power...like when i used to slam the gas the rpm would rise very sharply and quickly but now its as slow as hell and takes a long time...it feels like there is a major lack of power...im thinking maybee i need a tune?? or maybee a new fuel filter?? any input would be helpful thanks guys
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Old 11-29-2010, 07:06 AM   #2
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Re: serious lack of power

I hope several people pipe in until your functioning 100% again-
I would really check out all the CAI connections especially at the throttle body connector for gaps.
Now that you have a 3.8 please follow this bit of advice (regular maintenance for me): Replace the fuel filter, use Seafoam or the like sucking it up through the pcv induction line, also use it to soak the upper plenum ares just past the throttlebody where it can clean entire plenum back to the TB butterfly valve. Lastly clean the MAF sensor element gently by dipping it into capful of alcohol.
Follow those instructions and I promise better performance at the very least to help you eliminate possibilities and help completely fix it.
Hope that helps!
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Old 11-29-2010, 09:43 AM   #3
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Re: serious lack of power

its always good to do regular upkeep. fuel filter every 15k (or yearly) is a great idea. You have the new air filter, maf, and IAC. Check for any air leaks and make sure the maf is the right one for the car (im sure it is just double check).
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Old 11-29-2010, 07:42 PM   #4
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Re: serious lack of power

Yes check all your basics, air, fuel, spark. Plugs, intake related components and sensors, and fuel filter and sea foam to clean out any carbon deposits and buildup within the engine.

Also is your car throwing any codes? Check your info panel under your dash gauges next time you start the car.

Have you noticed any issues with the transmission? Many times you will try every solution to make your engine run better, and the true problem relies within the transmission. If it's an auto this could be the case. But I'd definitely try all the suggestions others have said first.
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Old 11-29-2010, 07:55 PM   #5
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Re: serious lack of power

yea its an auto...i was thinking its the transmission but the mechanic told me its fine...and the car isnt throwing any codes what so ever...just my egr back pressure valve needs replacement but then the mechanic said thats not something you need to worry about for now?!?
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Old 12-10-2010, 09:59 PM   #6
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Re: serious lack of power

AC or defrost on? When i have either on it feels like im riding the brakes. Stuck brake caliper maybe? And definatly follow advice on tune up. Fuel filter,sea foam and probably plugs and wires.
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Old 12-11-2010, 02:12 AM   #7
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Re: serious lack of power

You should remove your CAI and go back. Check your throttle body if it can open and close properly, connections, there might be an air leak causing lose of power and high gas consumption. If it started when you changed the CAI I am99% sure that its something in that area a bad fuel filter can't make your car change that dramatically in a few hours.
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Old 12-14-2010, 08:04 AM   #8
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Re: serious lack of power

Quote:
Originally Posted by nysiv16 View Post
hey guys...i have a 99 mustang 3.8L v6
recently i put in a k&N CAI and my IAC and MAF went bad...had those replaced due to my car idling really bad and shutting down on me...i just got the car like 3 months ago...even tough worse is fixed i feel a reallll lack of power...like when i used to slam the gas the rpm would rise very sharply and quickly but now its as slow as hell and takes a long time...it feels like there is a major lack of power...im thinking maybee i need a tune?? or maybee a new fuel filter?? any input would be helpful thanks guys
Just wounderin if it got fixed & how?
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Old 12-14-2010, 10:01 AM   #9
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Re: serious lack of power

Your EGR could cause driveability issues. I would not ignore the issue with your EGR valve if you are having power concernes.
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Old 12-14-2010, 11:07 AM   #10
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Re: serious lack of power

my car was having issues kinda similar, little shaking here and there, push the gas, car wouldnt really go and would putter. thought was tranny. had to replace my camshaft sensor
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Old 12-14-2010, 11:19 AM   #11
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Re: serious lack of power

yea, are they not easily changeable (EGRs) on the 3.8L? If money is an issue go to a pull a part and yank one off.
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Old 12-14-2010, 11:20 AM   #12
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Re: serious lack of power

Quote:
Originally Posted by blackonblack View Post
my car was having issues kinda similar, little shaking here and there, push the gas, car wouldnt really go and would putter. thought was tranny. had to replace my camshaft sensor
ive heard this as well, back when I had my 01 I put a underdrive pulley on it, the cam sensor uses little teeth on the crank pulley to work. It was not 100% tight (not tq'ed in all the way) and it through misfire codes from this.
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Old 12-14-2010, 12:03 PM   #13
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Re: serious lack of power

^yup. after replacing, its running like new. whole new feeling after it being messed up for months(could never figure out the problem)
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Old 12-14-2010, 12:12 PM   #14
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Re: serious lack of power

Basically, as you see, there are a ton of areas that could be causing this issue. Instead of spending money I would focus on the clear signs such as EGR and then have someone perform a complete diagnosis on the vehicle after that point.
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Old 12-14-2010, 12:19 PM   #15
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Re: serious lack of power

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Originally Posted by SpectorV View Post
yea, are they not easily changeable (EGRs) on the 3.8L? If money is an issue go to a pull a part and yank one off.
No Pretty easy to change. I changed the valve on my last 3.8 and ended up needing the solnoid instead.
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