Topic: Idle issues

[chardrc]

basically the tip of the isa motor has the closed throttle switch on it so for the isa motor to effect the throttle position the closed throttle switch has the be pushed in (unless it somehow got stuck open). step 4 for adjusting effectively does what you suggested except without removing it. but removing it would also be a good way to test.

[bammerman]

4) Fully retract ISA motor by holding closed throttle (idle)
switch plunger inward as throttle is opened. Closed throttle switch
plunger should not touch throttle lever in closed position. If
contact is made, check linkage and/or cable for binding or damage.
Repair as necessary.


When mine closed it touched the throttle lever.  I can just give it a little push to idle it down. Wonder if that means it is a bad ISA motor?

[bammerman]

Replaced the ISA with NAPA part, Chrysler no longer makes it and it idle's around 1.2 now

[sharpxmen]

Replaced the ISA with NAPA part, Chrysler no longer makes it and it idle's around 1.2 now

so you need to adjust that a little bit, should be able to drop it down to 8-900

[bammerman]

I have the screw turned all the way in, so do i just unscrew it a few times?

[sharpxmen]

I have the screw turned all the way in, so do i just unscrew it a few times?

i think "in" is where you need to go to lower the idle. you should see if loosening the support bolts you can move that bracket back a bit or maybe shim the isa motor on the back of the bracket - you have to move "away" from the throttle lever

[bammerman]

How much?  I did that by at least 3-4 full turns and it still about the same 1k to 1.2k (haven't taken it on highway yet to see how it reacts).

[bammerman]

Also when I stop at a stop light I a sitting at 2k again.  Is this norma?  Figured it would go back down to 1k rpms. 

[sharpxmen]

Also when I stop at a stop light I a sitting at 2k again.  Is this norma?  Figured it would go back down to 1k rpms. 

no, it's not normal - have you figured out if anything binds in there and the butterfly does not return fully or it's the ias motor that keeps it open - you need to figure that out first. unbolt the isa and see if that would let the rpm come back or still stays up at 2k. if it stays there then you need to look for something else.

[bammerman]

Took the motor off at you were right it went right down, at first it started to climb to 2k and i went and pushed on the throttle lever and it went back down and stayed there.  I dont see any kinks or anything on the cable. I put the motor back on at original factory position (screws all the way back) same thing.  When I unscrew the plate the plastic on one side is coming off.  Don't think that is right.  (the corner piece in the picture without a screw mount.
The screw looks to be WAY out but that is as far as it will go.  Picture below


I am going to go get a new spring later today and see if that helps.  I talked to two mechanics yesterday and they said that it was my ISA and to replace.  Let's hope I didn't waste 70.00 on it.

[chardrc]

if you are talking about plastic coming off on the new Isa motor i would return it and get another new one. after looking at your picture and then mine some more (other pics on my pc). if you think its the spring and you don't want to have to buy a new one you could try routing yours like mine is (from the pcv tube (metal part that goes to vacuum line) and to the upper part of the throttle linkage so that it is still pulling it closed) never knew it but my spring is the stock one but the inner spring broke so only the outer spring is doing the work now. but with the routing mine has its more stretched out at closed throttle.

if you have a accurate way to measure, you could measure the distance from the isa motor bracket to the throttle linkage with the motor on (and fully pushed in) and then without it on (and at 900rpm idle) to makesure that set screw/bolt isn't too long) although the falling apart plastic would be my main concern

[bammerman]

I think I fixed it this time.  I have the screws all the way back and took the old bolt that touched the throttle lever and replaced the gold one.  It is about a 1/2 inch shorter and running at 900-1k steady now.  letting it run till it gets up to temperature though to see if that changes anything

[bammerman]

I was wrong, when it heats up and I start driving it stay between 1.5-2k even though on startup it is at 900-1k rpm. I think I am just going to have to take it to a shop sicne i cannot fix.  I am not sure what to do next.

[bammerman]

Latest and last update i guess before I take to a shop.

I took off the motor again and backed out the mounting screws as far as they can go, good 1/2 in.  Start it up sitting at 900-1k again.  go for a drive, put in neutral and poof 1.5-2k again.  what can go wrong with such a high idle and is there a way to reset it?  like the computer in the jeep.  I had a problem with it awhile ago.  the plug came loose and my jeep would randomly stall and when it started up rpms would shoot to 4k.  found out just loose wire and fixed it.  could that be the cause and maybe just resetting it would fix it?

[sharpxmen]

it's not the isa motor - you said it doest the same thing with it unbolted. so next take the thing off once the engine is warm and get in the driver's seat and accelerate - if it stays at 2k then stop the engine and unhook the cable at the t/b. start the engine again and rev it by hand - if it goes down to 900 then it's the cable or the pedal, if it stays up to 1.5-2k then it's something at the t/b.