[RLW]

I'm a proud new owner of a white w/ red strips Mustang Shelby GT350 with a turbo supercharger. Have papers saying it has 675 hp. I found it setting under a tree with only 26,548 miles. Had been there all summer! I was told it went into "fail safe mode" and shut down. The guy who owned/built it had a hart attack and left it to his daughter. She didn't have the money to fix it so sold it to me .
It would turn over but would not start. I changed the plugs. It had HT0 but I couldn't find them so I used HT1, unplugged the MAS and the motor started. Had it checked out and they said it was the Mass Air Sensor (BA-2800) along with a long list of other things effected by it. After researching the prices on those and what it would take to upgrade to the BA3000, I started see about just cleaning it. Cleaning seems to have worked because the car will start (wouldn't before) and no fail safe warning but I am slowly losing fuel pressure and maxing out on my air/fuel ratio while idling in gear. Fuel pressure goes down when I take off. I can put it neutral and push the accelerator down and let off and it runs good. Every time I turn the air conditioner on the air to fuel gauge maxes out and runs really rough (pushing the accelerator down at this time does no good). Low fuel pressure but the plugs show evidence of running rich or burning to much gas. Any ideas on how I can fix this on my own? Or something to check? I'm sure I'm not making any since...

[jim293]

Welcome to AFM. Check out the tech sections for some answers.

[stlwagon]

Welcome aboard...
1. Lose the HT1s. You absolutely need the HT0s or you risk blowing up the motor.
2. Need to verify what fuel system is in there. If it's running on the stock pump only, that won't cut it.
3. Failsafe mode is almost always a sign of a bad throttle body or throttle position sensor.
4. Who did the tune and do you have the handheld tuner that was used?

[stlwagon]

I see a couple of potential problem areas. I'd suspect that GMS throttle body might be defective. And where is the fuel pressure sensor mounted on those fuel rails?

[stlwagon]

Disregard the fuel rail question. I see it now in the picture.

[Back@itagain]

Nice find but dont the Shelbys come with a name plate on the center of the dash?

[stlwagon]

Originally Posted by Back@itagain

Nice find but dont the Shelbys come with a name plate on the center of the dash?

And Shelby didn't actually make any 2005s. But it sure is a good looking ride! Can't beat red stripes on a white car!

[forensicsteve]

GT350 with a turbo supercharger

A turbo supercharger....now that is a rare find.

[RLW]

Paul's High Performance Inc. out of Michigan did the tune.
Here's a list of what was done:
Vortech 8 Rib Serpentine Conversion Kit
Inlet Temp Sender w/ Harness
Return Style Fuel System (pumps/lines/fittings/misc.)
Custom Power Pipe (vortech S/C application)
SCT BA-2800 Mass Air Meter w/ MAF Harness
Motorcraft O.E Manifold w/ IMRC plates
Autolite "0" Heat Range Spark Plugs
Motorcraft Front O2 Sensors
Custom PCM Flash
Dynojet Chassis Tune
Vortech Supercharger Upgrade (YJ to T-Trim)
Weld-in O2 Sensor Bung w/ plug
This work was done in 2007 and the car run perfect.


I'm having someone look at it Saturday that has the handheld and will update with the results.

Thanks stlwagon, I will change those 1's out ASAP

[RLW]

not a Shelby...got it. thanks everyone for the worm welcome. I can see there allot of awesome people here.

[stlwagon]

Ok now... Didn't realize it was a T-trim. 675 rwhp is certainly attainable. Like the fuel setup too. I'd say you stumbled onto a nice find. Only thing is I think you might be making a little too much power for the stock internals in that motor. You should do some reading in the forums to get up to speed.

[93_chargedcobra]

Originally Posted by RLW

Paul's High Performance Inc. out of Michigan did the tune.
Here's a list of what was done:
Vortech 8 Rib Serpentine Conversion Kit
Inlet Temp Sender w/ Harness
Return Style Fuel System (pumps/lines/fittings/misc.)
Custom Power Pipe (vortech S/C application)
SCT BA-2800 Mass Air Meter w/ MAF Harness
Motorcraft O.E Manifold w/ IMRC plates
Autolite "0" Heat Range Spark Plugs
Motorcraft Front O2 Sensors
Custom PCM Flash
Dynojet Chassis Tune
Vortech Supercharger Upgrade (YJ to T-Trim)
Weld-in O2 Sensor Bung w/ plug
This work was done in 2007 and the car run perfect.


I'm having someone look at it Saturday that has the handheld and will update with the results.

Thanks stlwagon, I will change those 1's out ASAP

If Paul's done the tune, and really it made 675 I find it hard to believe Paul would let it leave the shop unsafe, are you sure the bottom end isnt built?

Also the ba-3000 would require a new tune, and please dump that throttle body most aftermarket aren't near quality enough not alone a GMS one.

[TheKurgan]

Originally Posted by RLW

I'm a proud new owner of a white w/ red strips Mustang Shelby GT350 with a turbo supercharger.

You forgot Super Cobra Jet!!

[stlwagon]

Originally Posted by 93_chargedcobra

If Paul's done the tune, and really it made 675 I find it hard to believe Paul would let it leave the shop unsafe, are you sure the bottom end isnt built?

Also the ba-3000 would require a new tune, and please dump that throttle body most aftermarket aren't near quality enough not alone a GMS one.

Yeah I wonder if it has a forged bottom too.

[Back@itagain]

Originally Posted by 93_chargedcobra

If Paul's done the tune, and really it made 675 I find it hard to believe Paul would let it leave the shop unsafe, are you sure the bottom end isnt built?

Also the ba-3000 would require a new tune, and please dump that throttle body most aftermarket aren't near quality enough not alone a GMS one.

+1 on Paul's caution when dealing with customer cars. Just ask Sqidd. Paul wouldn't let him push the tune and I think he actually detuned his car some. I payed Paul's shop a visit a couple weeks ago and they definitely err on the side of caution. Great tuner!