Need Help 94 5.0

[Jacob302]

So I'm new to the group,and new to online discussion threads all together, with the exception of Facebook. I drive a 1994 Mustang GT 5.0 v8, I have dual Flowmaster straight pipes, shorty headers with no o2 sensors (not sure who they're made by they came with the car) , and k&n intake . I live on a tiny desert town where only one shop has the right diagnostics to hook up to it,last time I went there they cracked my windshield and denied it. I've been having a power surging issue, it idles fine,and sounds good when u rev it up , but when u start moving it sounds horrible and has power surges. I've replaced almost every sensor, plugs,wires,cap,rotor,but still can't find why it's sputtering. Before it started getting bad I noticed when in pushed in the clutch while driving rpms would go up,everybody told me I was just being picky and bout my car and it was fine,but it drove me crazy. And then that problem grew into the sputtering, but no check engine light came on

 

[94GTCoupe]

Codes need to be pulled, not everything will set the light off.

Your 94 will be OBD1, codes pulled from connector in engine bay on passenger side strut tower.
you can jump it and count the flashes of the check engine (google for procedure) or buy an inexpensive code reader.
They can be found at the parts store, walmart or online.

 

[Jacob302]

Thank you,but I think I may have found the reason,I found a bad vacuum line that goes under the intake manifold, sprayed throttle body cleaner and the rpms went up,but can't see the connection, have to pull the manifold?

 

[jozsefsz]

Pretty much yes, it would be incredibly difficult to get to without removing the upper intake. It comes off fairly easily.

 

[Jacob302]

Replaced the hose,and pcv valve while it was all apart,still surging n studdering.

 

[TMAN1970]

check fuel pressure and fuel filter. clean maf.
it should have 02 sensors just above cats, you should look at reading with a scanner if possible,

 

[Jacob302]

Just replaced MAF and fuel filter. Testing fuel pressure and cylinder compression today hopefully

 

[TMAN1970]

I am running acroos the same thing on my 95, unplug maf and see if it idles fine
replacing icm today on a hunch

 

[TMAN1970]

if it runs good easy to do cylinder drop test by pulling 1 wire at a time and feel drop on them. also if it runs good probably fuel strategy running lean or rich.

 

[Dacon]

Need Help 94 5.0 | Mustang Forums at StangNet