Hello again -
Thank you for your reply and further info -
Ok - as far as the idle issues go - I assume you have checked the pipework - breather system/ vacuum lines etc - and for any air ingress / leaks - any of the above not in proper order will cause that at low revs... If you haven't checked - that all needs doing.
Other than that - the biggest issue by far that will cause your idling issues is that the throttle body
needs a thorough clean internally - this is best done with a "carb cleaner" spray or such like - ensuring it sprays through all the ports etc - and be sure to clean the edges of the plate / throttle plate - open it to clean that - and also where the plate sits when closed - They get a dirt build up - or stick on the spindle and will cause such issues as you have..
Other than that - you do have the fault code 42 Smec - Injector and module faults etc.. So long as that is not an old / historic code - it could well be relevant... Im going to give you a link to a wealth of info on that ...more than I can type !... so this will be helpful for you on this fault code ( and others )... for that - click HERE
. Scroll down to the post 85 model / paragraph.. To - there is a lot more info there for you as I mention - as well as parts supplier too ;)
Code 37 that you have may or may not be important-- it is related to the transmission ( torque converter I will mention in a moment- so you need to follow through on that as follows..
Code 12 you can ignore.
Back to the trans then -
As far as the transmission issues go though which seems to be the main issue ( and can even affect idling too --- as a knock on effect )... This really could at this stage be anything in the transmission / system. I doubt to be honest that its anything on the control side - but of course the wiring / connections etc on the circuit should be checked - but its most likely internal.. either a torque converter or solenoid fault.
You have checked the fluid and thats good - no signs of major issues - so its as above. And then - to be 100% honest - at this point you really are best having an Auto specialist take a look. Usually they will start by opening it up - just removing the pan - and inspecting to any debris - metal filings and such like. They will clean the internal filter and flush it - and re try it. .. then go from there as / if necessary... it could be that will cure it !... but if not - they are fully equipped - both with the knowledge that is needed - and the test equipment and toolery to effect a repair as needed - at much cheaper costs than a general garage would charge. Often dealers and garages send such troubles to these people - as the alternative is replacement - which is always a horrendous cost - compared to repairs as needed....
So thats what I would recommend on this one now -to work through to getting this sorted for you -- thats the best overall / cheapest , cost effective way forward for you.
Check the things I have mentioned on the engine - and the throttle body first...
Let me know how you get on - and Im always happy to help you further as / if needed..
Very best Rgds, MIKE.Let me know if you need anything more on this at all -
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Please do click on the OK rating to Excellent ratings service for me now at this point , Thank you for that... and you can get back to me anytime if you need / wish..
Best Rgds, MIKE.