uneven idle and stalling when cold - Land Rovers Only

Thomaswa · 04-26-2006, 03:49 PM

I have a 1989 range Rover 3.9L with lots of miles.
I have just put a tune up in new plugs wires and cap and rotor. when the car is cold or has sat for more than an 1 or 2 hours. It idle is very uneven and the car stalls out. But once it is up to temp it runs fine. The tune up has helped. Where do i go now

RageRover · 04-26-2006, 03:59 PM

Is the ignition been timed? After the new rotor and cap? Might wanna check it out to be sure.

Then again, you said after it warms from a cold start, it runs fine, so a bad temp. sensor on the thermostat housing could be throwing of the computer, and making it run rich, also bad Oxygen Sensors. Just not too long ago, I tested my O2 sensors at my college shop, found the sensors, run the motor slightly rich, but not too bad, either way, I have to replace them. See if you can have a shop test those sensors.

I don't think the MAF sensor, or IAC motor have to do with your matter, but about the IAC motor, you can find in this forum how to clean it, I think OkieRover has an article about how to clean it. BTW IAC is Intake Air Control, also a Valve, keeps your idle up in some cases.

Have these things looked into, and hopefully it will solve your problem.

And Welcome to LRO man!

OkieRover · 04-27-2006, 07:42 AM

Check that Air Idler Valve first.
It don't cost a thing to clean.

04-26-2006, 03:49 PM	#1 (permalink)
Thomaswa Member Join Date: Jan 2006 Location: Portland, Oregon Posts: 5 Gallery: 0	uneven idle and stalling when cold I have a 1989 range Rover 3.9L with lots of miles. I have just put a tune up in new plugs wires and cap and rotor. when the car is cold or has sat for more than an 1 or 2 hours. It idle is very uneven and the car stalls out. But once it is up to temp it runs fine. The tune up has helped. Where do i go now

04-26-2006, 03:59 PM	#2 (permalink)
RageRover Crazy about Rovers and more... Join Date: Dec 2005 Location: Westland, MI Posts: 2,889 Gallery: 0	Is the ignition been timed? After the new rotor and cap? Might wanna check it out to be sure. Then again, you said after it warms from a cold start, it runs fine, so a bad temp. sensor on the thermostat housing could be throwing of the computer, and making it run rich, also bad Oxygen Sensors. Just not too long ago, I tested my O2 sensors at my college shop, found the sensors, run the motor slightly rich, but not too bad, either way, I have to replace them. See if you can have a shop test those sensors. I don't think the MAF sensor, or IAC motor have to do with your matter, but about the IAC motor, you can find in this forum how to clean it, I think OkieRover has an article about how to clean it. BTW IAC is Intake Air Control, also a Valve, keeps your idle up in some cases. Have these things looked into, and hopefully it will solve your problem. And Welcome to LRO man! __________________ Pat Albaugh, Midwest Moderator "Diffage" -the point at which the truck's differential makes contact with the ground. http://www.cardomain.com/id/RageRover42Visit my RRC and others here!(updated as of September 15, 2006) 1995 RRC LWB -LT265/75R16 Pathfinder All Terrains -RTE 2" Lift Springs -Pro Comp ES9000 Shocks (from DAP Enterprises) -KMC Front Diff Guard -4 Desert Fox 55 watt Lighting -Radio Shack CB Radio (never know when signal fails on a cell phone) -2 Halogen Super Sport 100 watt forward lights -Custom slim style front bumper w/ integrated bull bar -Lowe's Special "Homemade" Snorkel -T-Case out of an 92' RRC

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