High Idle When Warm

[Kracka]

No, they are original. The only thing I know is my factory gauge matches my after market one and my fans come on when the car is hot. Do you know of a way to test them?

Hook up a logger and see what coolant temps the ECU is seeing (gauge, rad fans, and ECU all have different sensors).

I highly doubt the ground strap on the downpipe would cause this since 99% of DSM's either now have aftermarket exhausts or the strap has corroded and broken off.

[xveganxcowboyx]

Ecu reports the same as the aftermarket gauge. Sorry, I didn't realize the gauge and ecu had different sensors.

[AwdGSX13]

in order to check coolant temp. sensors you need to warm them to 140 degrees F? and check for continuity, if its a open circuit it needs replacement.

This is coming from Mitchell On Demand. Auto Program from work.

[iceminion]

I just finished fixing the idle on all of my friends DSMs, so you may want to listen up.

First, take that retarded block-off plate off your DSM, trust mitsubishi on this one. Un-loop that coolant hose, and put the hoses back in the stock configuration.

The FIAV is great, it causes the engine to warm up faster, so your engine will last longer. Cold pistons = piston slap. The FIAV does not cause F*cked up idle, no matter how much you want to believe it.

Your ISC is dead, you need to throw it away. It also has ruined the driver control circuitry on your ECU.

SO now you have a ruined ISC and a damaged ecu.

Second, you need to buy a new ISC from www.dsmisc.com $140

Third, you will need to send your ECU into dsmchips.com -or- the DSMLink guys so they can fix the ISC controllers. $50.

If you dont believe me, take your DSM out for a drive, get going about 30mph, let off the gas while in Nuteral. Your engine should go down to ~1000 RPM. Now press on the brakes, at a complete stop, wait 2 seconds and your car should kick down to ~750RPM. This is stock behavior for a stock working idle control system.

I learned all of this from reading VFAQ BTW.

Oh, and mitsu temp sensors work great, or your car does not turn on, there is really no in-between with them. They wont be "just a little messed up"

[xveganxcowboyx]

I actually replaced the ISC before installing the block off plate. I had bad resistance across one set of prongs on my old one, the replacement was fine. I've been in need of an eprom ecu though, so this may just be another excuse to fork over some cash for one.

Your opinion of a new ecu with keeping the block off plate? (aside from the general liking of the ISC function)

[turbo-soundz]

Is the Check engine light on?

[scheides]

Is the Check engine light on?

LOL!

[xveganxcowboyx]

LOL!



Agreed. :score001:





For real though, no codes.

[mnim15]

Just curious, how does the circuitry on the ECU get damaged?

[AwdGSX13]

lots of reasons, caps can leak and mess it up...