MSilk

iTrader: (1)

Hey all,

I have been fighting the idle hunting gremlin ever since I got my TPS back into adjustment (it used to hunt when it was warm) After doing countless hours of reading on the forum I have tested everything that was mentioned (IAC, MAP, TPS, Ground wire on the exhaust it was disconnected, new fuel filter, new fuel pump sock (it was missing the sock and there was nothing in the tank i did these two in hopes of getting more then 300km per tank) Idle adjustment ect ect.

So while trying to adjust the idle I noticed that i could not get anything below 1200 RPM using both the air bleed and the stop screw on the throttle linkage, found my throttle cable too tight then managed to get the idle to 800 rpm but everything is at it's lowest possible setting I may have 1/8th of a turn left on the air bleed if that. While setting the idle i had the car warmed up to operating temp, TEN-GRD in diag box (which made no difference)

Is this normal?
mods are intakes, non sequential twins, DP, cat back exhaust, FMIC. JDM car

I am not worried about it more curious

Thanks everyone

Mike

lilfreddie

I was having a very difficult time diagnosing the last hunting idle on a 93 base, it ended up being a vacuum leak LIM had the original paper gasket. After 2-3 weeks of being annoyed I sprayed Carb cleaner everywhere and viola car revved up and I found the leak!

arghx

iTrader: (3)

buy/make a pressure tester:

http://www.fighters-garage.com/rx7.html scroll to the bottom

MSilk

iTrader: (1)

Thanks i will try the tester and see if there are any leaks, i have tried carb cleaner everywhere but nothing changed the idle did not change at all. It seems now that the idle is around 800 there is no more hunting but I will know for sure after I drive it today.

Thanks

Mike

milano maroon

iTrader: (1)

The pressure tester is a good idea, but you might also check to see how your secondary plates are adjusted.

Does anything happen when you are idling and unplug the ISC?

Narfle

iTrader: (16)

What is the rpm range when it's hunting?

MSilk

iTrader: (1)

I have not tried unplugging the ISC (I am assuming it is the IAC as well) while it is running. I did try taking the MAP vac hose off and that caused a noticeable difference.

The range in which it hunts is 1200 - 1600 ish rpm, so while it is warming up it hunts but as soon as it is warm it stops.

Mike

Narfle

iTrader: (16)

What is the status of your AWS?

MSilk

iTrader: (1)

it is unhooked (how it was when I bought it) the vacuum pot has no line going to it, the butterfly's are still in the TB as well.
When I get home today after work I am going to try unplugging the IAC and see what happens. I know when I had TEN to GRD to set rpm then unhooked it there was no increase in RPM. I have cleaned the IAC and tested it. It reads 12 ohms, there was a lot of gunk in it as well.

I will post back in a few hours

Mike

MSilk

iTrader: (1)

Ok so I found a small leak, noticed when I did a harder pull home and heard the turbos chatter, turns out the silicone vac line running to the BOV split in half, so now thats fixed. When i unplug the IAC the idle drops even lower, so it is doing something. I am still to pressure test the system as I have had very little time.
Any other ideas would be great

Mike

Narfle

iTrader: (16)

I think your IAC may have been improperly deleted. Have you checked your O2 sensor?

MSilk

iTrader: (1)

O2 is brand new just replaced it. Do you mean the AWS was improperly deleted? The IAC seems to be working. I will look for info on deleting the AWS and double check it all

Thank you
mike

MSilk

iTrader: (1)

My car is a JDM there should be no AWS correct? I must be thinking of something else, I am going to look into it. It is a small dashpot on the firewall side of the UIM that contorls two butterflys in the TB.


Mike

MSilk

iTrader: (1)

Its the DTC I was thinking of still a newbie


Mike

Narfle

iTrader: (16)

Yes, I meant AWS. My mistake.

MSilk

iTrader: (1)

Alright pressure test done and I have found a few leaks, had one line off completely and some others were not making a good enough seal. Main leak is right where the Double throttle comes through on the front of the UIM, it bubbles there, seeing as the double throttle is not hooked up I am thinking of just taking them out and sealing it up.

With the majority of the leaks fixed that car still hunts while it is warming up but as soon as it is warm it stops and just sits at 800 rpm (slight miss every 2-3 seconds but it has done that since day one)
So my ideas are that it either has something to do with the high idle(wax rod thingy) or maybe there is a leak on the DTC solenoid which wouldn't show up until the car it on.
If it was the DTC solenoid would just turning the key to the on position cause that solenoid to open and allow me to see if there was a leak there? (so long as the car is cold)

Thanks all

Mike

Ernesto13B

iTrader: (4)

I myself have a high idle issue too and I recently did a vacuum hose job. My idle does not hunt, but it steadily idles at 1300 rpm. How did you adjust the throttle cable?

MSilk

iTrader: (1)

there are two nuts on the end of the throttle cable right near the TB. you can loosen them off and you will notice right away how to adjust it. Basically you loosen one to get slack in the cable. I do not think you want much slack if I remember correctly the FSM wants 2 mm of play in the cable.


Mike

MSilk

iTrader: (1)

I got my hunting Idle fixed. After going over this issue a lot and re reading post after post it turned out that when I was trying to get my idle in the 750-800 range I did not re adjust the TPS. I measured the TPS and was off by just a little .5v narrow. So I readjusted and this morning there was no hunting when cold. I still have everything almost maxed to get my idle down. The secondary plates were not fully closed (just barely but if I forced em closed the rpm dropped about 100) Milano was spot on there.

So I am going to take the LIM off and replace the gasket there, I have tried spraying carb cleaner down there and nothing happens, I am thinking that there may be too much heat and it is causing the product to flash off before the spray makes it in.
With a leak large enough to cause my idle to be as high as it is would the car still make 18 inches of vacuum at idle?


Thanks everyone
Mike