What could be wrong?

[WhiteStallionGT]

This is a rare problem, but it pisses me off when it happens. I have an auto (which most of you already know) and when I'm in 1st gear and flooring it, when it gets to about 6k, it sounds like my exhaust makes this clunking noise and sounds like it's going to explode. I then power. This only happens when I'm at WOT.

I've had no problems with the transmission or anything since I purchased this vehicle back in August.

I noticed that ever since I got my offroad H pipe, this has been happening. Any input would be greatly appreciated.

 

[94MustangGT5.0]

It could be that your hitting the rev limiter and its shutting the fuel off to your engine. The only way that you would ever reach 6K though would be to have an RPM extender though or aftermarket ignition, because I believe the stock auto computers only alow the engine to be reved to ~5,600 - ~5,800. Thats at least where mine bounces off the rev limiter. It would make a popping noise like a backfire if you were doing this.

 

[94MustangGT5.0]

I then power.

If you meant "I then LOSE power", it's definitely your rev limiter kicking in.

 

[WhiteStallionGT]

lol what a horrible typo.

Damn this rev limiter. So the best way to fix this is to chip it?

 

[94MustangGT5.0]

If you are hitting the rev limiter by simply punching it in drive, the problem can be solved by getting a chip or a stand alone unit like the TwEECer. I have heard people with auto's love the TwEECer becauase you can change line pressures in the tranny and such. The reason you are now hitting the rev limiter is because before your 4.10's, your cars computer could send the signal to shift and the approx. 1 second delay would not interfere with your rev limiter because your RPM's weren't climbing as fast. But with the 4.10's, the lower gear ratio allows for the car to gain RPM's at a much faster rate, thus that 1 sec. delay in shifting allows the RPM's to bounce the limiter. The only other thing you could do I believe would be to replace the stock valve body with an aftermarket one or buy a shiftkit, which in turn makes the shifts happen at the snap of your fingers, eliminating the problem.

 

[juiced_94gt]

i hate rev limiters!!!!!!!

 

[WhiteStallionGT]

ahh sweet, good to know that a simple shift kit will fix the problem, makes sense.