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Discussion Starter · #1 ·
I'm at the end of my rope here. I've got a realitively stock 93' 5L with 60k miles that I recently installed an offroad H Pipe on and since then have experienced a problem that I cannot find the root of. As I've described on previous threads, the car demonstrates a hesitation/sputtering/rough running at 2-3k rpm. My initial assessment was a vacuum line off, as I've seen that before and did leave one off initially, that was accidentally left off during installation of the pipe. However, after pretty closely inspecting the lines, I've moved to other suspects such as fuel filter, plug wires, plugs, distributor, coil, rotor, and finally the MAF sensor. I haven't replaced the MAF sensor, but did clean the wires throughly with electrical cleaner, as I thought that a recently oiled K&N filter could have contaminated the sensor.

At any rate, my thought is now that maybe the Vacuum Solonoid was damaged when I left the vacuum line off after installation of the H-Pipe. I immediately reconnected the line after a brief drive, but the car has been demonstrating the hesitation ever since.

The car also picked up a slight twitch in the tachometer during idle, and while running, which I find strange. The car also just doesn't fire up strongly.

Does anyone have any other pointers? I'm to the point that I'm just going to have to take the car to have a diagnostic test run on it.
:tongue​
 

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I know it has been awhile since you posted this but my car did something like this about a year ago. we relpaced the distributor, timing belt, spark plugs, wires, checked all wiring, vaccum hoses, pcv valve, the coil was checked and then finally it was the o2 censors on the h-pipe.They may be hard to find depending where you live but in my area of Pa Fisher auto parts and ford dealers was the best place. Hope you get this and it helps. It took us over 2 months to figure out.
 

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Discussion Starter · #3 ·
Thanks!

Thanks, AS000. I haven't tried the 02 sensors yet, but I will. Like I said, I've done all I know to resolve the problem, and my next step is the ford dealership for diagnostic! I appreciate the tip, though.
 
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