I have a '93 Cobra which has been in storage for a couple of years. Although it has been in storage, I started the car on a regular basis up until about ten months ago. So, the car has been sitting for about ten months. A few weeks ago, I decided to take it out of storage and I found that the fuel pump had stopped working. So, I replaced the fuel pump and filter along with plugs, wires, oil and filter. I purged all of the old fuel that I could. So now, I am been experiencing a partial throttle misfire. If I am in a higher gear running around 1000 - 2000 rpm, the engine will misfire until I down shift and increase the throttle. Once I am running around 2500-3000 rpm, the engine doesn't seem to miss... Under a WOT condition, it seems to perform like a Cobra should. From what I have noticed, it does seem to be running a bit rich. Yesterday, I was sitting at a stop sign waiting on traffic. I sat there for a bout three minutes and when I pulled off from the stop sign, the engine bogged really bad, and backfired through the exhaust. The car has 78k on it. The engine has stock internals, stock GT40 heads, stock cobra intake, stock 65mm TB. It does have a set of BBK shorty headers and an off road x pipe with flowmaster mufflers/tailpipes, and also a K&N filter. I have recently removed the clutch fan, and added a electric fan and a 3-row Aluminum Radiator. The smog equipment has been removed.
Since I started experiencing the misfiring, I have cleaned the EGR valve, MAF Sensor, IAC valve, and the throttle body. I still have a misfire.... Any help or advice out there will be greatly appreciated!!!
Since I started experiencing the misfiring, I have cleaned the EGR valve, MAF Sensor, IAC valve, and the throttle body. I still have a misfire.... Any help or advice out there will be greatly appreciated!!!