Question about 1999 Land Rover Discovery

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IAC Solenoid My discovery's idle drops very low and cuts out when I slow down or am stopped at an intersection. It also occurs when I put the car in reverse.

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Buy a can of spray carb/throttle body cleaner from a parts store and clean the throttle valve butterfly and IAC aka idle speed control motor, do this with the engine running, you will have to hold the idle hi to perform this or it will stall, use at least 1/2 can of cleaner, then shut down and disconnect the battery for 5 minutes, reconnect and drive a few days to let the PCM relearn you driving habits.

Posted on Sep 03, 2008

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Posted on Jan 02, 2017

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1 Answer

How do I fix a problem of engine cutting out when I have air conditioning on and I slow down ?


idle air control valve problem , maybe ! Clogged passage . When you put extra load on the engine , such as turning on the A/C the PCM is suppose to raise the idle RPM . With a up scale scan tool you can see if the PCM is controlling the IAC valve . There are videos on you tube on cleaning The IAC , plus testing !
PCM is the engine computer ,just in case your not familiar with that .

Jul 20, 2016 | 2001 Ford Focus

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Just put in brand new alternator 2 days ago. Now it wants to stall when slowing down and at intersections.


Have car scanned at autozone or similar. My guess is egr valve or IAC. Egr exhaust gas recirculating valve, IAC idle air ?ontrol valve.

Dec 22, 2015 | 2004 Chevrolet Chevrolet TrailBlazer EXT

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I have a 2000 Pontiac Grand Am and it recently started shutting off SPECIFICALLY when I'm braking or slowing down. The idling drops really low like 200-300 rpm then cuts off or sometimes it boosts...


simple test if you have a vacuum brake booster
put the hand brake on and start the engine
if it idles bad --possible vacuum leak from gaskets , vent controls sensor problems
if it idles fine , put the foot on the brake
if it idles bad now -- replace the brake booster

May 02, 2017 | Pontiac Grand Am Cars & Trucks

1 Answer

Why should the truck shut down at a low idle or when u apply the brake to it the idle slows down an it cuts off on a 1992 ford f150


In some cases, the throttle body is dirty or the iac valve is faulty.
I would start with those two things.

Oct 11, 2012 | 1992 Ford F150 SuperCab

1 Answer

ENGINE IDLE DROPS WAY DOWN AT STOP LIGHT, SOMETIMES WANTS TO DIE IN MIDDLE OF INTERSECTION, SOMETIMES IDLE ACCELERATES WHEN SLOWING DOWN TO STOP.


You seem to have the dreaded IAC ( idle air control valve) problem that Ford is famous for. The first likely suspect is the IAC valve itself, but there can be other contributing factors. With the amount of space I could not do the subject justice, but there are many online Ford forums that address this problem. I think the Ford price for the IAC is around $100. The Autozone cheapie is around $50. I think the Ford unit is a better part, but you have to make your decision. Do some reading up on the subject before buying any parts though.
Good luck.

Dec 31, 2010 | 1988 Ford Bronco II

1 Answer

The engine would stop when speed is reduced or stopped.


i need more details but sounds like the idol is low

Dec 08, 2009 | 1983 Ford Fairmont

3 Answers

Engine cutting out when idling or slowing down


Here is the common cause of surges, stalls at stops, slow idle speed, erratic idle speed, rough idle and engine hesitation (and other problems), it is in most cases the idle speed control air-bypass valve and or throttle valve and upper intake, these area's get full of gunk and combustion residue over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake

Jun 18, 2009 | 2004 Renault 181

2 Answers

Low idle stalls out


Here is the most common cause of surges and stalls at stops and low erratic idle speed and rough idle, it is the idle speed control air-bypass valve and throttle valve (IAC for short), they get full of gunk over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake.

Mar 13, 2009 | 1989 Audi 200

1 Answer

I am currently experiencing engine idle problems, i have recently purchased the vehicle and the engine has been fine until now. When i stop at junctions and the engine is idleing it seems to now and again...


You need to replace your IAC (idle air control valve). The IAC, like it sounds, control the idle of your car. When they go bad they will cause the low idle and stalling. The IAC is located on the throttle body and is usually held on with a couple of screws. It is an easy relatively cheap fix that you can take care of by yourself. Let me know if you have any more questions. Thanks for rating my response and for using FixYa!

Aug 04, 2008 | 2001 BMW Z3

2 Answers

2004 Ford Ranger Low Idle


I figured out what was going on. supposedly on ford rangers the Idle Air Control Valve (IAC Valve) goes bad. i got a trouble code looked it up and sure enough it is the IAC Valve. Under 100 bucks for the part

Jul 04, 2008 | 2004 Ford Ranger

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