mk1 mx5 lumpy idle/bogging in damp help.

The Running Man · 20 May 2011 at 11:53

Hi my friend has a 1.6 mk1 mx5 cab and in the last couple of weeks he's noticed an issue as described in the thread title. A Quick Google tells me coil packs or potentially the tps mis set. My mate reckons damp ecu citing damp carpets and possibly blown cap. He has had the ecu angle grinded so he can physically remove and inspection it tommorrow at my gafe.

Any further thoughts or ideas on this and how likely it is to be the ecu or something else? I have a multimeter and a handheld obd2 scanner to thtowat it (not sure if it is obd2). Any thoughts welcome. Don't batter my grammar wriiten on my phone. Ta.

Evilpaul · 20 May 2011 at 12:11

You'll find more info over at the MX-5 Owners Club forums http://www.mx5oc.co.uk/forum/forums/

The MK1 MX-5 has a proprietary diagnostics port, so unfortunately your OBD2 reader won't be much use.
If you have some basic electronics kit you can use this guide to attach an LED and count the number of times it flashes to show error codes:
http://www.mx5oc.co.uk/forum/forums/t/204.aspx

Fireskull · 20 May 2011 at 12:32

A similar issue was HT Leads on mine, changed them and it fixed the problem

might be worth trying that first, they're not that expensive and some coloured ones look trick too

The Running Man · 20 May 2011 at 12:35

Is that a halfords job? For the ht leads?

Fireskull · 20 May 2011 at 12:41

Here: http://www.mx5parts.co.uk/index.php/cPath/53_59
Or here: http://www.autolinkmx5.com/ignition-parts-58-c.asp

Ive got the Magnecor Electrosport 80 blue ones.

The Running Man · 20 May 2011 at 14:28

Ta passed that on. He says he going to do the plugs and leads bit doubt he will go the whole magny route, aftersll its a 1.6 not a Turbo!

Firestar_3x · 20 May 2011 at 14:52

Based on my messings around with 5's:

1) ICV valve is blocked or gasket gone
2) Cracked line between crankcase and inlet manifold
3) Bad plugs
4) Old HT leads
5) Bad coilpack
6) TPS or TPS wiring
6) ECU issues (as in wet / damp)

Also those Magnecor leads did nowt except cost more and look blue.

Fireskull · 20 May 2011 at 15:32

I got mine for same price as standard so it was a no brainer, but yea I noticed no difference.