Mustang gt with no power!!!! help

psht...just get some NOS...ull be good then

bring it in to be checked out and have a full tune up done

Try using synthetic oil with copper spark plugs, if you that doesn't help, throw in 4.10 or 4.30 gears.

Well......adding more mods isn't really going to help his problem, when he is saying his current setup has felt like it lost power. have you had your 35K mile maintenance done? I would look into that, and then make sure everything else is tuned up. Have you been driving around with the same mods, or did you do something and then shortly after had issues? If you have been driving around with the mods and the same tune on your diablo for quite some time....it sounds like either you need a tune up, or 2 you to check your mass air, cats/02 sensors.

^Ditto about the mods. Think about it guys, he said ,"but trust me it used to move". Now what does that tell you? Means its acting like a dog now, but it used to run great. Do you have a check engine light? Use your diable for a diagnostic and see if anything is wrong. Otherwise I am thinking its has something to do with spark delivery (ie spark plug gap or COP problems). You didnt happen to wash your engine lately either right? It could be cats, but that is HIGHLY unlikely...like 2% chance of that happening, and if they did fail at 35K, it would be due to a 02 sensor going bad and causing the EEC to dump a TON of fuel or something....you would have got a CEL off of that. But you could also check the MAF like said.

I was having the same problem with my stang 2 months ago. I put a bottle of RISLONE and she now runs much better... that stuff works! I'm not the only one who's had awesome results with this stuff. Good Luck

MustangStallion said:

I was having the same problem with my stang 2 months ago. I put a bottle of RISLONE and she now runs much better... that stuff works! I'm not the only one who's had awesome results with this stuff. Good Luck

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What is Rislone? What does it do? Where do you put it? WHere do you get it?

You got an extended warantee and you did those mods? They ever give you any crap about that? My dealer said they won't even look at my car till I take some of the mods off.

Believe it or not, when my IAC was on the way out, I lost a lot of bottom end. I didn't realize it until I replaced the damn thing.

Good luck, it's something minor.

Most often a severe loss of power is caused by a plugged fuel filter. Next is plugged cats. That's if it still running faily smooth just bogging badly, no missfires. Plugged cats won't always turn on the service engine soon light. If your cats are plugged the exhaust would be noticable quiter and might even hiss at the seams. The intake might sound louder at open throttle. check the fuel filter first though.

Azarello said:

What is Rislone? What does it do? Where do you put it? WHere do you get it?

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http://www.rislone.com/engine.htm

I use the Engine treatment that goes in the oil. Before I used this stuff, I had to use at least 89 to keep the car from pinging. I just picked this stuff up at walmart for $2.79. After using just a little bit of this stuff (less than half a bottle) and using 87, the car feels like it's using 93. The car feels strong I can feel it. In addition, my gas mileage has gone up. Dad had the best result with this product. He drove 350miles to Houston in half a tank of gas on his Dodge Caravan! Twice, I might add. I'll be driving home this weekend so I'll see what kind of mileage I get with a fresh oil change and Rislone. I know a lot of people will roll their eyes at me..but for me, this stuff is a well kept secret. I love it! Good Luck!

04GT said:

You got an extended warantee and you did those mods? They ever give you any crap about that? My dealer said they won't even look at my car till I take some of the mods off.

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A dealership can't refuse to look at your car because you have some mods done to your car, especially the minimal that you have done. I would suggest going to another dealership. They can refuse fixing a part (under warranty)if they can prove the modification caused it, but they can't refuse to look at your car if it's having problems. If you threw a rod in your engine they couldn't say it's because you put an exhaust on.

rd02gt said:

Look i have a 2002 mustang gt with weld in flows, diablo tunner, air intake. and seriously this cars is a peice of junk right now, i can hardly get the damn thing to move? It only has 37,000 miles on it, its an auto. but trust me it used to move, i mean it is sooooo bad that i cant even squel the damn tires off the line??? please help what do i need to do, i do have a warrenty for 75000 and i know if i take it down they are gonig to stay its fine.? or will they? plz help i dont respect this thing

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Honestly, the best I could muster stock was a 14.6 with some wheel spin...Autos arent that quick off the line unless u throw some mods at it, namely a trqe cnvtr/410's or 430's and a shift kit of some sort. I bet ud be happy then...thats if everything else checks out okay.

replace plugs and fuel filter. not fixed , put back to factory tune and check again.

98V6 K.I.T.T. said:

A dealership can't refuse to look at your car because you have some mods done to your car, especially the minimal that you have done. I would suggest going to another dealership. They can refuse fixing a part (under warranty)if they can prove the modification caused it, but they can't refuse to look at your car if it's having problems. If you threw a rod in your engine they couldn't say it's because you put an exhaust on.

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+1
Magnusson-Moss Act

git-it-83 said:

+1
Magnusson-Moss Act

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+2

MaxedGT said:

Most often a severe loss of power is caused by a plugged fuel filter. Next is plugged cats. That's if it still running faily smooth just bogging badly, no missfires. Plugged cats won't always turn on the service engine soon light. If your cats are plugged the exhaust would be noticable quiter and might even hiss at the seams. The intake might sound louder at open throttle. check the fuel filter first though.

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i agree. check your fuel filter first.

do you notice any other stuff other than a loss of power. such as misfiring up hills?