Question about Pontiac Grand Am

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My 95 grand am has a very high idle and increases speed going down the road what could be the problem? I just had replaced the engine control moduule, ecm computer and the spoark plug boots. the car has a 2.3L

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Hi! You may want to check on the MAF (mass air flow) sensor. The mas has big contribution on engine performance specially on the idling and vaccum supply. The MAF is surely faulty thats why the RPM is high and increases while going down. Have it replaced and you'll be good. Hope this helps and thank you for using FixYa!

Posted on Oct 08, 2010

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Posted on Jan 02, 2017

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2007 ford taurus condensor fan not coming on with ac


Fan Control The PCM monitors certain parameters (such as engine coolant temperature, vehicle speed, A/C on/off status, A/C pressure) to determine engine cooling fan needs.
For variable speed electric fan(s):
The PCM controls the fan speed and operation using a duty cycle output on the fan control variable (FCV) circuit. The fan controller (located at or integral to the engine cooling fan assembly) receives the FCV command and operates the cooling fan at the speed requested (by varying the power applied to the fan motor).


EDGE/MKX, FIVE HUNDRED/FREESTYLE/MONTEGO, FUSION/MILAN/MKZ, CROWN VICTORIA/GRAND MARQUIS, TOWN CAR: FCV DUTY CYCLE OUTPUT FROM PCM (negative duty cycle) FCV Duty Cycle Command (NEGATIVE (-) duty cycle) Cooling Fan Response/Speed Greater than 0 but less than 5% Fan off, controller inactive Greater than 5% but less than 10% Fan off, controller is in active/ready state Edge/MKX, Crown Victoria/Grand Marquis, Town Car:
10% - 90% Edge/MKX, Crown Victoria/Grand Marquis, Town Car:
Linear speed increase from 30% to 100% Five Hundred/Freestyle/Montego, Fusion/Milan/MKZ:
30% - 90% Five Hundred/Freestyle/Montego, Fusion/Milan/MKZ:
Linear speed increase from 50% to 100% Greater than 90% but less than 95% 100% Greater than 95% but less than 100% Fan off
For relay controlled fans:
The PCM controls the fan operation through the fan control (FC) (single speed fan applications), low fan control (LFC), medium fan control (MFC), and/or high fan control (HFC) outputs. Some applications will have the xFC circuit wired to 2 separate relays.
For 3-speed fans, although the PCM output circuits are called low, medium, and high fan control (FC), cooling fan speed is controlled by a combination of these outputs. Refer to the following table.
If you don't understand these thing's listed above your best bet is to take your vehicle to a qualified repair shop . Have the vehicle checked for DTC'S - diagnostic trouble codes !
If

Jun 14, 2016 | Ford Cars & Trucks

1 Answer

After starting my 98 metro 1 liter the idle increases in less than a few minutes until the engine is racing so fast I have to shut it down, help?


Generally speaking, the only way for the idle speed to increase is if extra air is getting past the throttle plate.
So that could include the throttle plate sticking open, the idle air control valve not closing, or a vac leak somewhere such as a hose or gasket.
If you can cover the throttle body with something and the engine still runs at a high speed there is a large vac leak somewhere.

Jan 22, 2013 | Cars & Trucks

1 Answer

High Idle when warmed up. 95 Grand cherokee 4liter. i can let off the gas and the vehicle will accelerate up to 30mph stays at about 1500rpms idling


Hi. Anon.
It sounds like your IACV, ( Idle Air Control Valve), is bad. I would go to the parts store, if you can drive the vehicle and have them hook a scanner up to your vehicle, ( its free) and pull the codes for you. This will give you a better idea of what is happening with your engine. Hope this helps. Let me know.

May 30, 2017 | 1995 Jeep Grand Cherokee

2 Answers

Oil gauge drops low at idle


Low oil pressure at idle can be caused by an engine with worn rod or main bearings due to (usually) high mileage . This however does not mean the engine is still not serviceable as long as the oil pressure is low only at idle. The pressure should at minimum get into the normal range at anything above idle speed.Not much oil pressure is really necessary at LOW speed. At low speed, as long as there is oil getting to the bearings, even at low pressure, you are OK. In a high mileage engine the oil pressure is often low at idle simply because the oil pump is turning slowly and cannot maintain higher pressure between the larger than normal crankshaft and bearing clearances. As speed increases the pump turns faster and supplies more oil and the pressure should go higher. Low pressure as long as it is only at idle is not a problem. However at higher speeds the pressure should be in the normal range. Such a worn engine can benefit from higher viscosity (thicker) oil such as 20W-50 in above freezing weather and 10W-40 in winter. That will increase idle pressure and the thicker oil film maintains a better film between the worn parts

Apr 08, 2012 | 2002 Jeep Grand Cherokee

1 Answer

I have a 1989 Jeep Cherokee Pioneer with 242k miles on it. In line 6, 5 speed manual, 4 wheel drive. I am having trouble with it starting the first time. When it does start it will idle high for about ten...


mine also will quit going down the road, and idles high at times, or idles low, like having a mine of it's own. possibly idle air speed solenoid (which i replaced on mine) and still does this. another tech said only factory solenoid will "talk" to ecm properly?

Sep 01, 2010 | 1990 Jeep Cherokee Limited

1 Answer

2.7 crd.grand cherokee 2002. Varying idling speed,dimmng lights


well it could be the idle control valve or vacuum leak check all vacuum lines for cracks and listen for air sound you may need to check PVC valve

Feb 08, 2010 | 2002 Jeep Grand Cherokee

3 Answers

When I come to a stop, the car dies. After idling for a few moments, the RPMs start dropping below 1000 and the car dies sometimes. What's my problem? I just replaced a fuel filter, and it was running...


Here are the common cause of surges, cold stalls, 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.

Nov 16, 2009 | 2002 Saturn L-Series

2 Answers

Stalls when at lower revolutions or when stopped


Low / uneven idle problem can cause by a lot of components.

Dirty air filter

Dirty injectors + o-rings

Vacuum leak at intake manifold and vacuum hose.

Bad Idle Air Control Motor (IAC)

Low compression (170 psi + is OK)

Start cleaning and repair these trouble spots and see is there any improvement.

====

For more advance DIY'er then you may try this.

Use a can of Berryman carburetor clean to locate the vacuum leak.


SEE SAMPLE PICTURE HERE


This is a 20-30 minutes job.

Vacuum leaks can occur in following locations.


Intake manifold AND/OR vacuum lines.


Intake manifold is not accessible unless the engine head if off.

You can still check the potential leak by spraying some Berryman near the intake manifold.

Listen for rpm increase after you introduce the Berryman (FUEL) at idle.


Do the same starting from the brake booster unit (the round unit) on the drive side fire all.

Carefully listen for increase of RPM right after to spray the Berryman to the potential vacuum spot.

Get a friend to HEAR the ROM increase or monitor for RPM on the tech.

DO NOT AIM the Berryman into any heat source.


PLEASE RATE my answer if it is useful to you.

Sep 28, 2009 | 2004 Dodge Grand Caravan

1 Answer

2000 grand caravan won't go above 70 mph. high rpms


First I need to ask is it a 4 speed or a 3 speed transmission. If it's a 4 speed when driving down the road pull it from drive to third gear. You shpuld hear the engine speed up if it does not then that means you have on 4th gear and you will have to take it to a transmission shop. If it's a 3 speed then just count the shift points if all 3 gears are present then drive down the road and see if the van goes into tcc. When you mean the rpms are high how high are they.

Jul 15, 2009 | 2000 Dodge Caravan

2 Answers

High idle in a 2004 Grand Am


Yes, the sensor is the first thing you should replace.

May 08, 2009 | 2004 Pontiac Grand Am

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