MX-5 Issues

mejinks

mejinks

mejinks

Soldato
Joined
28 Oct 2002
Posts
5,035
Location
Hiraeth
A friend of mine is having loads of problems with his Eunos and I said I would ask here to see if anyone had a clue. Here is his post from mx5oc:

I've just bought a 1995 Eunos roadster 1.8 and got a slight problem with it - possibly not the car itself but it has a "Field" simple fuel controller and a "Pivot" airflow conditioner system installed. When I bought it a few weeks ago i drove it home about a 100 miles with no problems, and I took it out for a spin the other day about 50 miles and again no problem. However we parked it up on the way back and after about an hour we drove home which is about 15 miles. It started missing and backfiring slightly, and every time we slowed down for roundabouts it was missing and we didn't think we'd make it home. We just about made it and parked up outside but then when we went to put the car onto the drive it wouldnt start so we ended up pushing it onto the drive (and slowly crashed into the porch as the other half didn't realise the brakes wouldn't work with the engine off - broken number plate and a smashed porch, but that's another story) !!
Anyway i was wondering if the fuel controller would be the cause of the problems - I'm not sure how this thing has been setup - the previous owner didnt know either - as in the picture the top box just had the green light on and the bottom box wasn't switched on - but when i turned the engine on and switched both boxes on the engine just died - do they both need to be turned on, does the car need to use higher grade petrol or is there dirt in the fuel etc etc - i'm loathe to take it out for a spin again just in case it breaks down - should i take it to an auto electrical garage ?
Update-I've just taken it out for a spin again - with both boxes switched on (switched on before i turned the key), it kept stalling and juddering so i switched them both off and it drove reasonably ok but i'm not convinced it wouldn't conk out again if i went for a long drive
Any ideas gratefully received - apologies for the blurry picture
An option is to get them taken out altogether, again does anyone know if this is simple enough ?

Picture of the fuel controller here if it helps - not the best quality picture

http://www.flickr.com/photos/7781145@N03/3720242026/


Thanks
 
Might be worth just removing those extra bits and running total stock again. Never heard of either of these ever mentioned on mx5 forums.
 
Thanks for the replies guys. I told him to disconnect the fuses and see what happens. Am I right in assuming that all they do is sit in the wiring loom and alter the readings going to the ECU?
 
They prolly need to be powered to pass the stock ecu signals though, unless its been FI at some point having either of those on an NA mx-5 is somewhat pointless.

Hopefully he hasn't hacked the loom too much, i'd remove totally tbh, ecu can be found the the pass footwell under a metal plate with tamper proof heads.
 
The leads are the source of so many problems, as is the lack of a fuel filter change.

Give it a good service including plugs leads and filter and go from there, its cheap and easy to do on a 5 and he should have done it anyway.
 
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