Have high idle condition in a M88, Here is what I've done so far:
Engine is newly rebuilt
New o rings in metering needles
New o rings in bypass screw
Fully flowed injectors with new o rings
Adjusted bypass, throttle blades, bypass screw per manual
Slide valve works well. fully closed at working temp (an still high idle). caped bypass hose and has no effect.
new plenum/intake horn couplers with new clamps
New TPS and it is adjusted properly (click at idle position)and corroborated by terminal ohm readings.
idle stop screws have throttle blades closed on all cylinders.
throttle mechanism push rods are adjusted as per manual.
all gaskets are new, all hoses are new.
Bypass screw makes very little effect, even when all the way in. At factory spec, rpms are within 50 of full closed reading.
Ideas are welcome
TIA
Jpr
This may help...or maybe not, now that I read the complete post
http://mantismanometers.bigcartel.co...djustment-tool
Last edited by CSGuy; 02-13-2018 at 02:21 PM.
I do know that ECU plays a role in Idle, as I currently have a euro ECU which has resulted in a higher idle, I also have a spare US spec ECU which allowed the car to idle at a lower RPM.
So maybe try swapping the ECU?
Simple and I'm sure you have checked it. Hose from dipstick tube to plenum ? Make sure the air flows freely, that small hole in the dipstick tube is VERY small
Bookmarks