03 cobra bad numbers (stumped)

[LS WUT]

Thank you guys honestly for the support and feed back. I’ll take her back but next for her is suspension and save for a whipple.

Now that’s what I’m talking about.

 

[mark23svt]

Hey guys so got the car home it made the correct power but it seems to hesitate a bit from a dead stop but not always and sometimes from second to third.

 

[mark23svt]

Also when I filled up the car to max it was leaking gas pretty bad but only when full after a little bit of driving it stopped. Shop owner told me prob fuel hat seal.

 

[mark23svt]

My question is, is that frps still suppose to be connected on a return system?

 

[2003RedfireVert]

My question is, is that frps still suppose to be connected on a return system?

Yes, the frps should still be connected.

 

[olympic]

Datalog the hesitation if you can. It'll show if there's anything weird going on with the MAF, TPS, fuel pressure, volts, etc.. If everything checks out it's likely something that can be fixed in the tune.

 

[mark23svt]

Yes, the frps should still be connected.

Ok thank you.

 

[mark23svt]

Datalog the hesitation if you can. It'll show if there's anything weird going on with the MAF, TPS, fuel pressure, volts, etc.. If everything checks out it's likely something that can be fixed in the tune.

Ok so I know noob question but can I data log with the X4 tuner?

 

[olympic]

This video shows how to do it:


Since you said the hesitation is intermittent, it may take a bunch of tries to capture the car doing it in a datalog. A short 15-30 second log would be ideal. You can also just drive around for 5-10 minutes with the logger running but you'll need a stop watch or something so you can write down when the hesitation occurred. Once you have the log file on your computer you can upload it somewhere like Google Drive and we can look at it.

 

[mark23svt]

This video shows how to do it:


Since you said the hesitation is intermittent, it may take a bunch of tries to capture the car doing it in a datalog. A short 15-30 second log would be ideal. You can also just drive around for 5-10 minutes with the logger running but you'll need a stop watch or something so you can write down when the hesitation occurred. Once you have the log file on your computer you can upload it somewhere like Google Drive and we can look at it.

Awesome thank you brotha.

 

[98 svt]

Wow, just read through the thread. All that over the need for a shorter belt.

Did you still need to pay the $1000 extra?

 

[Shadow Grey 03]

Also when I filled up the car to max it was leaking gas pretty bad but only when full after a little bit of driving it stopped. Shop owner told me prob fuel hat seal.

The tank has the "lower" area with the hat and then a large bit of volume that sits above the top of the hat, on the passenger side of the tank. If it's only shortly after fill up, the gasket/grommet where the filler neck goes into the tank is the more likely problem. It is also above the hat to tank seal.

 

[mark23svt]

Wow, just read through the thread. All that over the need for a shorter belt.

Did you still need to pay the $1000 extra?

Yeah he said that was from the extra parts and on parts swaps and fuel

 

[mark23svt]

The tank has the "lower" area with the hat and then a large bit of volume that sits above the top of the hat, on the passenger side of the tank. If it's only shortly after fill up, the gasket/grommet where the filler neck goes into the tank is the more likely problem. It is also above the hat to tank seal.

Oh that’s true I should look at that one first instead of taking out my fuel hat

 

[mark23svt]

Hey guys so going to try and data log this weekend if anyone can help me look at it I would truly appreciate it. If you can pm me your email if possible. Thank you.

 

[muscleatsrice]

Yeah he said that was from the extra parts and on parts swaps and fuel

Sent from my iPhone using the svtperformance.com mobile app

 

[NotSatisfied]

Different dyno. Different day. As long as it runs good and fuel curves are fine. Send it


Sent from my iPhone using svtperformance.com

 

[mark23svt]

So took out the plugs they were at 28. And looked a bit white on top. Switched to auto light 103 with whatever gap it comes with and it didn’t solve the problem. Didn’t get worse but didn’t get better.

 

[mark23svt]

Next I’m going to rent a vacumm leak machine or a smoker and test that see how that goes.

 

[mark23svt]

Haven’t been able to test for vacumm. But I did check my battery and alternator to make sure that’s not it and it’s not. Those are good so that checks off

Intercooler working
Spark plugs made no change
Battery good
Alternator good

I did a small datalog I’ll try to post later. Also not sure if it’s normal but while idling (idle has a small surge) the boost bypass valve opens a little and closes.