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Can I swop an ECU from a 94 to a 95. They have same 3 sockets but different numbers on top.

94 is K820 whereas 95 is k858.

My Right (closest firewall) O2 sensor is reading about 1.2v at 4500rpm.

Does this need replacing? Would the O2 sensor cause this much of an effect?

The Left one is fine. 0.7 at 4500rpm and below 0.4v on decel and higher than 0.5 on accel. (F2-154).

Just tested the coolant and crankshaft sensors. Both OK.

Any Idea how to test the Camshaft sensor without an oscilloscope?

Could the engine coolant temp sensor have burnt out? It's been over heating on occasion. Keeps pushing all the water out.

No it's worse when it's cold

Which sensor would it be in that case?

Whilst adjusting the disty advance I have discovered that if I RUN the engine with TEN & GND connected the stutter goes away! I've read that your not supposed to start the engine with these connected but it was a mistake. As soon as I unconnect them and start the engine again it's back to it's h...

I only replaced the disty CAP. Could the timing still be wrong? (I did take it off and try the 626 disty). But I marked where the original was. Can I check the ECM by grounding one probe of a multimeter and testing the voltages of each pin (mainly 2F and 2I)? Could it be the fuel side? When I press ...

Really would appreciate any help on this guys.

Finally got my 626 distributor cap and leads which actually turned out to be the whole distributor! Good old eBay :P . The cap from this dissy is totally different to the MX-3. So tried the whole thing and nothing. So bought a brand new MX-3 cap and it Cured it. I thought. For a second. The revs on ...

Cool Andy. Thanks for the info. It's in the post so hopefully I'll find out tomorrow. You probably saved me trying to bash it on with a big hammer.

keep working on it guy. You've done a pretty good job of trying to provide info to help diagnose the problem (especially the videos and all) Thanks Tempus. I try to keep it short n sweet and less woffly crap like this. :lol: I think you maybe right about the weak/missing spark as the new plugs real...

Is this a box with a light bulb in it?

http://cgi.ebay.co.uk/Mazda-MX5-Eunos-D ... dZViewItem

or is it worth while

I looked everywhere mate. Nothing! Will it definately be the standard 16 pin OBDII socket? Anyway I can't find anyother open sockets so what now? Is my only option to pay some dude "20-30 for 2 minuites work?
(did I ever tell you how stingy I am )

I replaced the spark plugs and it's made a big difference. Not so hesitant now but it's still there (driveable just about). It's back firing alot though. I'm trying to get a 2nd hand distributor cap and leads to try that. But I need to make sure the cap is the same as the ford probe and mazda 626. N...

WD40 trick did'nt show up anything.

Could the timing advance be wrong? I can't measure this though. Should I adjust the distributer slightly and try it? (whilst jumping TEN & GND)