Question about 1996 Mercury Grand Marquis

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Car won't idle without revving when cold and dies when in drive

OBD check showed only possible bad idle air controller or vacuum leak; I couldn't find a vacuum leak. Could a bad IAC cause the car to be difficult to keep idling when cold? Problem began few weeks ago, car would start and idle, but would die when put in drive; then problem progressed to the point where accelerator has to be depressed to get to start when cold and must be kept revved until warm in order to keep idling. After that the car seems to run fine. Thanks for your help.

Bill

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This Vehicle needs an Idle air control/Idle speed motor. Good Luck

Posted on Dec 28, 2008

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When you have an extremely high idle and code p2008 shows up what could the problem be


Without knowing what car you have it gets difficult to be specific, however since usually p2008 is dealing with intake manifold runner control, and you have a high idle...Id say you may possibly have a loose or broken vacuum hose to runner control...with the vacuum off the runners cant be regulated...and the air leaking in through the bad/open hose will raise idle. check vacuum hoses and runner linikage

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There are a few things you can check for, 1. the idle air control valve for carbon and the same for the throttle plate having varnish or carbon build-up . Use spray carb. cleaner if any of these are black with carbon.2. A dirty mass air flow sensor will cause stalling and Idle problems . You can get cleaner just for mass air flow sensors ,don't use carb.clean ,or brake clean ! Or you could possibly have a vacuum leak ! check all vacuum hose , you can spray carb cleaner at intake gaskets to check for leaks , but be careful it is flammable !!!
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The safer alternative is to have the engine "smoked" for vacuum leaks. This is done with a smoker. Any place that is leaking you will see smoke.

A trained ear will also be able to hear a leak.

If no leaks are found try unplugging the MAF sensor. Is is in the air tube next to the air filter box. If performance improves try cleaning it with some MAF sensor cleaner. If that doesn't work than you may need to replace it.

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1 month ago replaced catalytic (sp?) convertor, battery, starter switch and now the check engine light came on and the car is revving high at times while driving


replacing these items won`t cause your problem.you will have to find out what code set the light and go from there.you don`t say if the revving is at idle or not if it is you could have a bad idle control motor or a cracked vacuum hose that acts up at certain times.even a bad throttle position sensor(tps),egr valve,so its important to know what set the light on.

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My car just randomly dies after i shift it from reverse to drive. its an automatic by the way.


Check for sludging in throttle body or bad idle air control. How are your ignition wires and spark plugs? Have you ever cleaned your injectors? Do you have any vacuum leaks? Is the check engine light on? Here is a possibility: disconnected your battery for 3 minutes, then connect and run for 2 minutes without touching throttle. This is called adaptive learning strategy.

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the idle air control solenoid or a vacuum leak on backside of intake the hose that goes to pcv valve.they are both common problems on this car.check for vacuum leak firstthanks for your question....

Feb 04, 2009 | 2000 Ford Focus

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Fast Idle Problem With 99 Isuzu Rodeo V6


Hi.

If problem is only on startup and when idleing, then the problem is likely IAC system, also a vacuum leak will cause the same problem.

If problem is not only on startup and idle, but also when driving, then MAP sensor and EGR system must be checked.

Check also accelerator cable state and setting.


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The first thing to do is pulling out the OBDII fault codes stored in the ECM. This is done connecting a code reader to the ECM diagnostic port. The job can be done for a small fee at any local garage, and it is done for free at AutoZone.

The codes will help locating the problem.

About possible faults:

Problem is stalling when idling and during startup, but engine idling fast all the time. Problem not starting at times it is due to the fact that the wrong mixture is being sprayed, this is probably causing flooding and misfire. Since the CEL is on, one of the codes returned is probably misfire.

Check accelerator.

Check IAC system. This is composed by a valve and a solenoid that check and control amount of extra air air when the engine is idling. The IAC valve is located on top of the throttle body.

Check the vacuum system and try cranking with gas tank cap off. Vacuum system is tested using an hand tool gauge onvacuum lines while spraying card cleaner on the hoses (or heating them with a torch). If there is a leak, pressure will go up. A big leak will also do hissing noise, and will often result in a lean code when doing an OBD code scanning.

This kind of symptoms can also be caused by weak wiring to MAP/MAF sensor (MAP in this engine).

If the car also drives very rough and is revving up and down in a weird way, check the EGR valve.

As first thing I would do a code scanning. This car is OBDII. The scan can be done for free at the nearest Autozone, or for a small fee at any garage.

If you get any OBDII code from the scan, report it here, so that we can individuate the possible reason for the problem.

If you repute my solution helpful, then please take some times to accept the solution. Providing good repair tips requires time and skills, and your feedback is important for us.

Regards.

Ginko.

Aug 01, 2008 | 1999 Isuzu Rodeo

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