running rough

mossy · Postby **mossy** » Fri Nov 14, 2008 1:55 pm

I just converted the 96 mx5 back to standard got it running and went for a couple of drives and all seemed well. Went to start it the other day and it idled really rough and does the same when I rev it as well, I changed the ignition leads to new ones but that didn't make a difference, it also smells like its running rich, any ideas?

ampz · Postby **ampz** » Fri Nov 14, 2008 3:24 pm

Mossy, you had a FFS on that yeah?
If so, did you change the injectors to run the FFS or just use yours standard ones + extra injector?
I'm taking a guess at maybe some wiring has worked loose (unless you used a patch through harness) and your ecu is in limp home mode (do the NA8s have a check engine light?).

Check for an oxygen sensor signal, an injector stuck open (put a screwdriver on the body of each injector, then you ear to the handle, you should hear a clear ticking sound, if it is muffled the injector is stuck open) a vacuum leak from one of themany fittings.

Maybe you have too much fuel pressure (the regulator may be flowing too much)

mossy · Postby **mossy** » Fri Nov 14, 2008 4:00 pm

I ran the stardard injectors but I never got in running right as it was running way rich, maybe it has clogged the cat from then? I couldn't find a loose vacuum hose and I've put in new spark plugs and had the injectors cleaned last week.

ampz · Postby **ampz** » Fri Nov 14, 2008 8:00 pm

What about the throttle body?

Was that relocated to the front of the supercharger?
If so, did you get a new gasket to put it back on the inlet manifold?

I tore mine after doing a couple of mods to the t/b and it was a bit weird for a while (I made a new one out of card).

I'll think about it a bit and If anything comes up I'll yell out.

mossy · Postby **mossy** » Sat Nov 15, 2008 11:50 am

I played around with the leads and wiggled the leads at the coil pack quite a bit and it ran a bit better then I started it this morning and it runs fine :roll: