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'89 3.0 surging problem found, still high idle when cold. #893996 07/03/08 09:28 PM
Joined: Apr 2008
Posts: 52
J
Jon94JGC Offline OP
Getting the Wheeling Fever
Well I got stranded sunday and had to be towed home. My buddy listened by the tank as my Raider would run for about 1 minute and die, he could hear the fuel pump run then quit. So after replacing that, it runs like a champ now, what I thought was running bad when cold was always the fuel pump going out. It still idles high when cold but runs awesome, has tons of power. I can live with the high idle, it still takes about 6 minutes to warm up then the idle is normal. Hope this helps someone.
btw I couldn't find my old thread to put this update on it.

Plus I re-painted the top around the windows, and painted the rocker black and put on new tires and wheels.
[Linked Image]

Last edited by Jon94JGC; 07/03/08 09:52 PM.

1989 Raider 3.0 5 speed 225K Possible rebuild about 30k ago, no proof.
Dual Bouncy seats, HL washers. New Mud King 235's on 15x7 Crager soft 8's. Dark tint. Superwinch hubs. Herculined Interior.
Re: '89 3.0 surging problem found, still high idle when cold. [Re: Jon94JGC] #893997 07/04/08 12:50 PM
Joined: Apr 2008
Posts: 441
TainterRacing Offline
Mudrunner
I like the paint on it!!! looks great.


1997 Montero LS with a motor swap a 1990 V6 12valve ported heads full 2.5in Ex I run stock tire size for Daily use, off road have 33x12.5 working on going trubo.
Re: '89 3.0 surging problem found, still high idle when cold. [Re: Jon94JGC] #893998 07/06/08 02:37 AM
Joined: Apr 2006
Posts: 1,193
mxmikie Offline
Body Damage is Cool
the cold idle is adjustable on the water choke housing of the throttlebody 1 screw and a allen wrench

Last edited by mxmikie; 07/06/08 02:38 AM.

it dosent have to be surrounded by water to be an island
Re: '89 3.0 surging problem found, still high idle when cold. [Re: mxmikie] #893999 07/06/08 05:09 AM
Joined: Apr 2008
Posts: 52
J
Jon94JGC Offline OP
Getting the Wheeling Fever
That sounds interesting, could you supply a picture or better directions please


1989 Raider 3.0 5 speed 225K Possible rebuild about 30k ago, no proof.
Dual Bouncy seats, HL washers. New Mud King 235's on 15x7 Crager soft 8's. Dark tint. Superwinch hubs. Herculined Interior.
Re: '89 3.0 surging problem found, still high idle when cold. [Re: Jon94JGC] #894000 07/06/08 12:56 PM
Joined: Feb 2004
Posts: 10,238
FrankR Offline
Web Wheeler
****
Quote
I can live with the high idle, it still takes about 6 minutes to warm up then the idle is normal.


Leave the idle valve alone..... it's preset at the factory for proper idle air once the engine is warm. Since you said that your engine idles correctly when warm, adjusting the valve will only make things worse. You need to find out the cause of the cold idle being too high (if it is).

Check the IAC stepper motor coils, the engine coolant temperature sender and the MAF sensor. Clean the stepper motor and throttle body. Check the vacuum lines and the thermo vacuum switch. Check/replace the thermostat.

Frank


'89 [color:"white"]G-Raider[color:"white"] [color:"black"]Supercharged 3.0L, MegaSquirt 2, lockup A/T, 2.5" exhaust, 172k, Cibie H4s/Oscar SCs, Hella Micro DE fogs, Cobra CB, Superwinch hubs, LSD rear/Aussie Locker front, Bilsteins, Lifeline AGM, Rust-Oleum
Re: '89 3.0 surging problem found, still high idle when cold. [Re: FrankR] #894001 07/06/08 05:43 PM
Joined: Apr 2008
Posts: 52
J
Jon94JGC Offline OP
Getting the Wheeling Fever
Quote
Quote
I can live with the high idle, it still takes about 6 minutes to warm up then the idle is normal.


Leave the idle valve alone..... it's preset at the factory for proper idle air once the engine is warm. Since you said that your engine idles correctly when warm, adjusting the valve will only make things worse. You need to find out the cause of the cold idle being too high (if it is).

Check the IAC stepper motor coils, the engine coolant temperature sender and the MAF sensor. Clean the stepper motor and throttle body. Check the vacuum lines and the thermo vacuum switch. Check/replace the thermostat.

Frank


Thanks for the input, I have changed the thermostat, cleaned and checked the resistance on the IAC, cleaned the MAF sensor, checked vacuum lines, and the temp sender. What is the thermo vacuum switch?


1989 Raider 3.0 5 speed 225K Possible rebuild about 30k ago, no proof.
Dual Bouncy seats, HL washers. New Mud King 235's on 15x7 Crager soft 8's. Dark tint. Superwinch hubs. Herculined Interior.
Re: '89 3.0 surging problem found, still high idle when cold. [Re: Jon94JGC] #894002 07/06/08 06:14 PM
Joined: Feb 2004
Posts: 10,238
FrankR Offline
Web Wheeler
****
Quote
What is the thermo vacuum switch?


It's at the front of the thermostat area, with 2 vacuum lines running to it.... controls EGR air supply. The switch can lose value and/or the plastic nipples can crack and leak.

It should not hold a vacuum below 50?F and should hold vacuum above 65?F.

If you have the FSM, run all of the tests shown wrt MPI and Emissions Control - EGR, TPS, MAF etc. Be sure to test the ECT sensor.

Frank


'89 [color:"white"]G-Raider[color:"white"] [color:"black"]Supercharged 3.0L, MegaSquirt 2, lockup A/T, 2.5" exhaust, 172k, Cibie H4s/Oscar SCs, Hella Micro DE fogs, Cobra CB, Superwinch hubs, LSD rear/Aussie Locker front, Bilsteins, Lifeline AGM, Rust-Oleum







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