unstable idle.....

[britlude]

got home from work today, and the car was doing this..... (you dont have to watch all of it to get the idea....)



so air filter box n tube off....

1553638990305 by jon sutherland, on Flickr

and a quick clean of the throttle intake, disconnected the ecu controlled idle air valve, and started up, just to make sure the base line idle was ok....

1553638990097 by jon sutherland, on Flickr

42.34 hz relates to 848rpm... (just multiply the Hz value by 20!)

fortunately this is ok, maybe a little high, but it'll have to do, as my throttle body doesn't have the idle adjust screw as per the usual drawings....

1553638989789 by jon sutherland, on Flickr


clock fuse removed for 10 mins, just to make sure, AICV reconnected,car started and allowed to do its thing for 15 mins....usual reports are of the car changing engine speeds as its relearning its basic settings... mine just sits there, and slowly drops it's idle.... switch off and straight on again, and we have this....



that'll do then!!!


edit... small pics... odd!!!!!

[britlude]

in other news, my aerial got into the habit of doing this....

IMG_20190215_104757 by jon sutherland, on Flickr

so i got a comprehensive repair kit from croooober....

IMG_20190215_135104 by jon sutherland, on Flickr

and with a new flush grommet made up....

IMG_20190215_180437 by jon sutherland, on Flickr

.... it was all refitted and now works fine.....

[britlude]

in other, other news..still chasing the intermittent fault that convinces the gearbox computer that the throttle has dropped off and is lying in the road somewhere.....

i thought i had a breakthrough when the ecu and tcs computers flagged up the same fault.... it MUST be the throttle pot...so, ordered a replacement off the 'bay....

Screenshot_20190215_173439_com.ebay.mobile by jon sutherland, on Flickr

to find that despite what the listings said re. fitting a NSX no problem, the spring return was bias the wrong way..... as supplied the lever tang is parked between the bolt hole and connector.....

just to be awkward the nsx rotates the other way and the tang ends up pointing toward a mounting hole..... so an annoying re-jig of the spring (you basically have to turn it inside out!!).... and end up with....

IMG_20190213_165025 by jon sutherland, on Flickr

refit, and calibrate to the requisite 0.5 v at no throttle, and off we go...

all the ecu's are happy now, hurrah...

.....until the gearbox one decides it's not! grrr.... still hunting then....... now bought a portable oscilloscope so i can monitor the tps output levels!

[Kaz-kzukNA1]

The base idle air adjust screw for non-DBW model.

[britlude]

Ah, so it's buried under some sealer, I thought it was the casting!!! I'll have to do some digging!!!

[Kaz-kzukNA1]

If it's covered in grey locking paint/sealant, then it's never adjusted after leaving the factory.

It will look like this.
Different TH body (no TCS) but still, non-DBW so same location.

Please ignore the black marking (like half moon) as it should be all brass/gold colour.

Kaz