NA6 Air Valve & TPS

Postby **NitroDann** » Mon Sep 02, 2013 2:27 pm

I cannot imagine water working at all, just my 2c.

And without being 100% certain you have no air leak you are on a wild goose chase.

Dann

Gladiator · Postby **Gladiator** » Mon Sep 02, 2013 2:31 pm

manga_blue wrote:That's the theory, but theory rarely seems to apply properly with high idle problems.

True, I'll give it a go. Do you mean to short across the terminals on the switch side, with the engine running?

Gladiator · Postby **Gladiator** » Mon Sep 02, 2013 2:37 pm

NitroDann wrote:I cannot imagine water working at all, just my 2c.

And without being 100% certain you have no air leak you are on a wild goose chase.

Dann

Ok, I've just re-checked using throttle body cleaner, and I can confirm there are no leaks.

Postby **NitroDann** » Mon Sep 02, 2013 2:42 pm

Sweet.

And it has an oem ecu, no piggybacks etc?

The ground and ten should work and I cannot think of much that would change that apart from fiddling with the electrics.

Dann

Gladiator · Postby **Gladiator** » Mon Sep 02, 2013 2:54 pm

OEM ECU, No Piggy backs. I've not fiddled with the electrics, however the wiring to the AFM is wrapped with elec tape, so who knows what's been done before. I've had this problem intermittently since I replaced the short nose engine with a long nose about a year ago. The old engine ran like a pig due to a flogged & poorly repaired keyway.

Postby **NitroDann** » Mon Sep 02, 2013 2:56 pm

Tried a different AFM?

Looked inside the afm wiring?

I dont trust any electrical work anybody has done if it has any electrical tape on it.

Dann

Gladiator · Postby **Gladiator** » Mon Sep 02, 2013 3:09 pm

Oh dear. I unwrapped the lecy tape and this is what I found. I don't know what's been done. I'll unwrap the wires. Stay tuned.

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Gladiator · Postby **Gladiator** » Mon Sep 02, 2013 3:21 pm

Def been a repair of some sort, two wires cut & an extra piece soldered in. As though a piece was cut out & then they were too short. The joins seem secure though, and the colour codes match except for the extra pieces soldered in.

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Gladiator · Postby **Gladiator** » Tue Sep 03, 2013 5:53 pm

OK, so this car has had multiple things affecting the idle. Inoperative clutch switch - fixed. ISCV proven bad with a multimeter - replaced with good second hand one today. Also replaced all vac lines today. It's better but still not right, so I'm booking it in to MX5 Plus for next week.

93_Clubman · Postby **93_Clubman** » Wed Sep 04, 2013 1:04 pm

Given there's a bit of time between now & when you're looking to book the car in, might be worth having a quick look inside the ECU at the earth post, PCB & capacitors for any discolouration, & checking engine earthing points.

Faulty CTS causing high idle:
viewtopic.php?f=18&t=47933

Lot of ground covered in this, so it might contain an idea or two: viewtopic.php?f=29&t=39507&p=511745

Also a lot of ground covered in this: viewtopic.php?f=29&t=35192&p=456477

Gladiator · Postby **Gladiator** » Wed Sep 04, 2013 8:04 pm

Thanks clubman
I'll try on the weekend, & I'll read your links then too. Hopefully they'll have pics 'cause I don't know what some of those things are.

)

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93_Clubman · Postby **93_Clubman** » Thu Sep 05, 2013 11:17 am

No pics, but this should cover it:

93_Clubman wrote:ECU at the earth post (mounted to the PCB & screwed to the side of the ECU casing), printed circuit board & capacitors for any discolouration (look for any browning around components on the green PCB), & checking engine earthing points.

Faulty Coolant Temp Sensor causing high idle:
viewtopic.php?f=18&t=47933

Gladiator · Postby **Gladiator** » Sat Sep 07, 2013 5:28 pm

Hey Clubman
I pulled the ECU today & there's no browning or dis colouring & to my untrained eye it looks like new. Here's some pics.

[img]http://img.tapatalk.com/d/13/09/07/yha8uda9.jpg[/IMj[IMG]http://img.tapatalk.com/d/13/09/07/avy3aqe6.jpg[/img]
I tried to check the neutral switch as you said but couldn't get two hands to the connectors.

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Gladiator · Postby **Gladiator** » Sat Sep 07, 2013 5:54 pm

Sorry here's the second pic.

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93_Clubman · Postby **93_Clubman** » Sun Sep 08, 2013 12:56 am

As you say looks ok (from the pics) - if you've not reinstalled the ECU it's worth removing the cover from the otherside to similarly check the underside of the printed circuit board. Also keep an eye out for any loose components. Btw, did you end up replacing the CTS?