Need Your Help

[4.6MustangGT]

My friend has a 2002 GT 5-Speed and full bolt-on’t on it. The car was running perfect and suddenly this problem appears? The car is dying and the acceleration is too heavy from idle to 5000 RPM range and then from 5000 to the rev-limiter is perfect.

We checked and replaced all the sensors like Cam position sensor, Crank position sensor TPS, Changed the coils, MAF and the spark plugs, cleaned the injectors, replaced the fuel pump, fuel filter rail to a new one.

The car gives feeling that the timing is retard up to 5000 RPM range and then return back to normal to the rev-limiter.

Here the car modifications:
Hooker LT, Hooker X-pipe, Borla cat-back, 4.10, BBK 75 TB, Trick Flow plenum, BBK U/P, March ram air system, K&N filter, Comp Cam XE262AH-13 and Diablo Tuner. 293 rwhp / 310 rwtq with tune.

Your help will be appreciating. Regards,

 

[mity2]

CEL?

 

[Stang|ess]

Degreed the cams?

 

[Shiroelex]

Only doing this while under load, or even when just revving in neutral?

 

[4.6MustangGT]

Thanks for your reply guyz,

Stang|ess: The guy who installed the cams he said that he set the cam exactly like the factory setting. The problem that the car was running perfect for 3 month’s!


Shiroelex: Yes bro, both but more while under the load.

 

[Shiroelex]

Check the fuel pump's pressure. A pump can stil work, but not be strong enough. Are you getting any spark knocking, or any other funny noises, when it cuts out? Also, did you try reinstalling the factory tune from the Diablo, and trying it? Sometimes a computer can be quirky.

 

[fluffyrunnells]

CEL?

check engine light..??

 

[mity2]

check engine light..??

Is check Engine light on?

 

[fluffyrunnells]

Is check Engine light on?

????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????

 

[mity2]

??????????????????????????????????????????
???????????????????????????????????????????????????????????
???????????????????????????????????????????????????????????????????????????????????????????

WTF? His car is running funny. So i asked if check engine light is on, or perhaps he pulled code out.

 

[tomustang]

IAC check?

 

[fluffyrunnells]

WTF? His car is running funny. So i asked if check engine light is on, or perhaps he pulled code out.

 

[4.6MustangGT]

Is check Engine light on?

No check Engine light? and no code? Imagine

 

[4.6MustangGT]

IAC check?

Checked and replaced to a new one.

 

[4.6MustangGT]

Check the fuel pump's pressure. A pump can stil work, but not be strong enough. Are you getting any spark knocking, or any other funny noises, when it cuts out? Also, did you try reinstalling the factory tune from the Diablo, and trying it? Sometimes a computer can be quirky.

Thanks Shiroelex, I’m not sure if they checked the fuel pump pressure but I’ll ask if they did, regarding the spark knocking; no we are not getting any knocking and also we returned the factory tune since we faced the problem.

 

[mstng4point6gt]

I had a similar problem on my 97 GT. I cleaned the injectors and also replaced my fuel pressure regulator with an adjustable BBK fuel pressure regulator. This fixed my problem.

 

[Pennywise2]

Did you change all your 02 sensors? No check engine and codes really?