The Good old rough Idle problem. Same but differnet

Ducati848 · 01-09-2010, 06:47 PM

Hey Guys,

My Girlfriend has a Ford Laser 96 (Mazda 323) 1.8L auto. It has the good old problem with the Idle where when it starts up cold it does not misfire but once it get hot it starts misfiring and does it more once the Aircon goes on. These are the things I have replaced

-spark plugs
-leads
-Air filter
-Fuel filter
-Rotor and Cap
-cleaned Maf sensor
-cleaned Throttle body
-Inspected vacuum lines
-and the last thing....... the Idle control valve

This is my issue at the moment, I tested the old ICV with a 9v battery to see if the motor works and all that happened was a clicking noise and no movement. So I thought I would go to the wreckers and get a New one. The problem is with this one is that it is doing the same thing and clicking with the 9v battery test. What are other tests could I do to test the Old and newer IAC and do you guys think the new one is faulty?

Before anyone says, yes I know I should take it to a mechanic but this car is not going to get the better of me!!!

Cosmo Dude · 01-09-2010, 07:25 PM

Not really a test...
Give it an over night soaking in WD40 or similar. Sounds more like an ignition problem though.

Ducati848 · 01-09-2010, 07:53 PM

Yea that's what I thought to start off with but the distributor is firing on all cylinders

rodhog · 01-09-2010, 11:07 PM

you sure it's misfire ?

have you run it hot then disconnected the leads one by one to find which one it is. if it goes around the systems I can't remember if it runs dizzy on that mdoel check the cap and rotor. if not you might have ignighter or similar issue.

misfires a min on intake control systems or even emission controls

it's most of the time ignition - timing related - I've seen cars iwth unchange timming belts slip and the cam changes it's position and it will mis fire hot due to massive retardtions or advancement.

then oyu have the fuel side of it. injectors sticking or failing when hot due to air leaks around old o-rings - allows extra air in

asanga · 02-09-2010, 08:51 AM

Quote:

Originally Posted by Ducati848

I tested the old ICV with a 9v battery to see if the motor works and all that happened was a clicking noise and no movement. So I thought I would go to the wreckers and get a New one. The problem is with this one is that it is doing the same thing and clicking with the 9v battery test. What are other tests could I do to test the Old and newer IAC and do you guys think the new one is faulty?

Before anyone says, yes I know I should take it to a mechanic but this car is not going to get the better of me!!!

9V battery does not have enough current to drive the solenoid valve.Thats why you hear a clicking noise with no movement. just use your 12v car battery and momentarily connect and you'll see a movement. basically if it reads 10-12 ohms that means the coil is good and your valve should work unless the shaft is stuck due to buildup of gunk (like cosmo said use WD40 or carby cleaner to clean it). I think both your valves are good and the problem may be ignition or fuel related. Like others said check the dissy cap & rotor and they are not expensive parts either.

Ducati848 · 02-09-2010, 07:39 PM

No worries guys, I forgot to say i've done the cap and rotor already. I think my next area to look at would be the injectors and see how that goes.

Thanks for the answer to the 9v battery test, I've been told that it does work but I did check the the ohms and its sitting at 10ohms, so it must be good. Oh well its all good I paid $10 for a ICV at the wreckers so no loss.

Ducati848 · 02-09-2010, 07:50 PM

Also its only jumpy at around 800RPM and below

rodhog · 03-09-2010, 05:46 PM

have you checked the earthing. Heat might causeing earth cable to be a little loose on connection

Ducati848 · 13-09-2010, 07:44 PM

no i haven't cheers

01-09-2010, 06:47 PM	#1
Ducati848 Junior Member Join Date: Sep 2010 Location: brisbane australia Car: holden commodore VE SS/ Ducati 848 MY10 Posts: 5	The Good old rough Idle problem. Same but differnet Hey Guys, My Girlfriend has a Ford Laser 96 (Mazda 323) 1.8L auto. It has the good old problem with the Idle where when it starts up cold it does not misfire but once it get hot it starts misfiring and does it more once the Aircon goes on. These are the things I have replaced -spark plugs -leads -Air filter -Fuel filter -Rotor and Cap -cleaned Maf sensor -cleaned Throttle body -Inspected vacuum lines -and the last thing....... the Idle control valve This is my issue at the moment, I tested the old ICV with a 9v battery to see if the motor works and all that happened was a clicking noise and no movement. So I thought I would go to the wreckers and get a New one. The problem is with this one is that it is doing the same thing and clicking with the 9v battery test. What are other tests could I do to test the Old and newer IAC and do you guys think the new one is faulty? Before anyone says, yes I know I should take it to a mechanic but this car is not going to get the better of me!!! Last edited by Ducati848; 02-09-2010 at 09:35 PM.

01-09-2010, 07:25 PM	#2
Cosmo Dude コスモ Join Date: Dec 2002 Location: Location: Vic Car: Mazda '95 Astina I4, '86 B2K and '10 3 MZR-CD Posts: 7,888 View Photos By: Cosmo Dude	Not really a test... Give it an over night soaking in WD40 or similar. Sounds more like an ignition problem though. __________________ My 'stina Hatch

02-09-2010, 07:50 PM	#7
Ducati848 Junior Member Join Date: Sep 2010 Location: brisbane australia Car: holden commodore VE SS/ Ducati 848 MY10 Posts: 5	Also its only jumpy at around 800RPM and below Last edited by Ducati848; 02-09-2010 at 08:27 PM.

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01-09-2010, 07:53 PM	#3
Ducati848 Junior Member Join Date: Sep 2010 Location: brisbane australia Car: holden commodore VE SS/ Ducati 848 MY10 Posts: 5	Yea that's what I thought to start off with but the distributor is firing on all cylinders

01-09-2010, 11:07 PM	#4
rodhog Senior Member Join Date: May 2005 Location: Sydney Lakemba Car: mx-6 626 Gs300 Maz2 was 95 KF BA-HT Posts: 2,024 View Photos By: rodhog	you sure it's misfire ? have you run it hot then disconnected the leads one by one to find which one it is. if it goes around the systems I can't remember if it runs dizzy on that mdoel check the cap and rotor. if not you might have ignighter or similar issue. misfires a min on intake control systems or even emission controls it's most of the time ignition - timing related - I've seen cars iwth unchange timming belts slip and the cam changes it's position and it will mis fire hot due to massive retardtions or advancement. then oyu have the fuel side of it. injectors sticking or failing when hot due to air leaks around old o-rings - allows extra air in

02-09-2010, 07:39 PM	#6
Ducati848 Junior Member Join Date: Sep 2010 Location: brisbane australia Car: holden commodore VE SS/ Ducati 848 MY10 Posts: 5	No worries guys, I forgot to say i've done the cap and rotor already. I think my next area to look at would be the injectors and see how that goes. Thanks for the answer to the 9v battery test, I've been told that it does work but I did check the the ohms and its sitting at 10ohms, so it must be good. Oh well its all good I paid $10 for a ICV at the wreckers so no loss.

03-09-2010, 05:46 PM	#8
rodhog Senior Member Join Date: May 2005 Location: Sydney Lakemba Car: mx-6 626 Gs300 Maz2 was 95 KF BA-HT Posts: 2,024 View Photos By: rodhog	have you checked the earthing. Heat might causeing earth cable to be a little loose on connection

13-09-2010, 07:44 PM	#9
Ducati848 Junior Member Join Date: Sep 2010 Location: brisbane australia Car: holden commodore VE SS/ Ducati 848 MY10 Posts: 5	no i haven't cheers