Need help, cobra is not running right

dragrazor · Post by **dragrazor** » Mon Aug 25, 2008 4:36 pm

Hey guys, I need your help and experience. I drove the cobra today for the first time in about 1 month. When I drove out of my garage, I noticed that the car was sluggish. I filled the tank because it was low on gas and got on the highway. The car was running like if it was on 4 cylinders. It just so happens that I was enroute to my buddies mechanic shop. I explained the issue and we changed the fuel filter. He also tested the fuel pressure via the fuel rail. With the hose on the regulator, it had 35psi. With the hose off the regulator, it has 45psi. I took it out for a spin and it was still sluggish. At times, I would feel a pop coming from inside the motor. When the pop occurred, I would feel the pop on my right foot coming from the gas pedal. I decided to take it on the highway. The car still feels sluggish and sputters uncontrollably at about 5000 rpm in every gear. The car idles fine, just does not have the power it had. Any ideas

Mike S. · Post by **Mike S.** » Mon Aug 25, 2008 4:55 pm

First thing to do is see if it's throwing a code.

-MJS

dragrazor · Post by **dragrazor** » Mon Aug 25, 2008 5:17 pm

No code, one of the first things I checked. The check engine light would have come on right?

93Cobra1928 · Post by **93Cobra1928** » Mon Aug 25, 2008 6:22 pm

No, only "hard" codes throw a CEL. There are several that will cause driveability issues that wont give you a CEL.

They have an excellent write up on pulling codes and troubleshooting on my5oh.com

v1cobra · Post by **v1cobra** » Sun Sep 28, 2008 1:14 pm

Maybe the mass air meter, what does it do when you pin it?

nmm347 · Post by **nmm347** » Sun Sep 28, 2008 6:32 pm

Go drive the car and get it up to temp then bring it back and park it. Once it's cool pull the plugs and see who's not behaving. The pop could be a rich situation or something else. If you've got one bank that's rich and the other that is normal then it might be the O2 sensor on that side. If you've done anything around the distributor recently check it and make sure it hasn't worked loose (rare) and advanced or retarded on you.

dragrazor · Post by **dragrazor** » Sun Sep 28, 2008 10:56 pm

Sorry that I did not update my progress here. I installed a new cap and rotor and its running like new again. Thank you for all your help.