mx5cartalk.com

Hi guys,

Since putting in a new adaptronic ECU, changing back to 4 injectors instead of 5, and re-tuning, my 1989 turbo MX5 hasnt been idleing smoothly. I will start it up and without my foot on the accelorator it will go straight up to 2000rpm and then slowly drop to 1000. Then whilst driving, if I slow to go around a corner and change down, the revs go up! The other day I drove it to the shop, parked up for 15 mins and when restarted it shot up to 3000rpm without me touching the accelorator.

Yesterday I took out my factory air flow metre as the tuner said it wasnt needed anymore and put in a piece of stainless steel pipe in its place. This seems to have improved the rev problem a fair bit but its still not right, still reving randomly, but not as often.

Im taking it back to the tuner on Monday but he doesnt seem to know what the problem would be so is going to have a look at it.

Any suggestions?

Thanks

You need to tune the idle control

Amount of fuel at idle, load compensation for AC/power steer, idle at hot/cold (fuel enrichment when cold), idle control valve etc.

Tuner should be able to sort it out.

Thanks A.Chen89, I would have hoped the tuner has already done that but I will check with him

Who's doing the tune?

Hyperdrive

Well, took it back to Hyperdrive, Andrew did some adjustments to the ECU and its running a LOT smoother now

cool

Just so the rest of us learn something from your issue do you know wht the tuner did to improve things? Short post cranking, perhaps?

Sorry Ja9 I didn't ask, not very car savvy so I probably wouldn't have understood the answer anyway :-/