Question about 2004 Mercury Sable

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2004 Mercury sable 3.0 dohc duratech will not idle properly I replace IAC and tps and cleaned maf ...I disconnected the battery for a bit still doing same thing ...I'm thinking it is the fuel pressure sensor on the fuel rail this also a regulator or is that a separate part

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  • Brad Brown Nov 07, 2014

    Idle too slow or too fast? Rough or smooth? what about fuel economy? What other symptoms?



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Hey its possible..i would make sure gas is good..make sure gas cap is tight..then it could be disturber ..if not burnt valve...

Posted on Nov 07, 2014


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Posted on Jan 02, 2017

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SOURCE: when i plug in maf sensor camaro idles from 500 to

Check all the vacuum lines for leaks, and also the timing, make sure its right.

Posted on Mar 10, 2010

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SOURCE: 2001 taurus dohc codes 171

There is a large vac line coming straight down from the throttle body that goes to the PCV system. See if it has a hole in it. It is likely sucking air.

Posted on Jul 17, 2010

  • 334 Answers

SOURCE: 2004 ford taurus ses 3.0

The fuel pressure regulator is on the fuel rail..But it sounds like to me like a stuck idle air control or a vacuum leak..Look carefully at all the vacuum lines and make sure they are not broke or crimped..If it stuck idling high you can tap on the valve and the idle will come down

Posted on Sep 05, 2011

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SOURCE: I have a 2002 Mercury Sable with the 3.0 DOHC engine. The check engine light came on and the code read EGR system pressure feedback. I have put in a new EGR valve, pressure feedback sensor, solenoid,

The vacuum lines are incorrect,that or the EGR solenoid is restricted,causing the EGR to open

Posted on Sep 26, 2012

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Why does it have incorrect idle and hangs on fast idle before dropping down to normal?

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2002 Mercury Sable100,000Visitor. Idle control valve makes the idle high and with foot off the accelerator car runs at 40-45 MPH. I disconnected the electrical ...

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Codes 171 and 174, rough cold idle, maf replaced 17 months ago----could it be tps or iac motor

Check for a loose or broken vacuum hose or attachment.Or the air intake hose to throttle might be loose. don-ohio

Jan 04, 2013 | 2001 Mercury Sable

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I have a 2001 mercury sable with a 3.0 dohc engine. When you start the engine it misses and runs rough till it warms up, it then runs fine

Run the codes,change spark plugs,clean the MAF sensor and always make sure to replace a fuel filter every 30K miles. don-ohio

Dec 31, 2012 | 2001 Mercury Sable

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Ohter think waths mean the code p1504? mercury sable 2001 dohc 24 valvulas

P1504 Throttle Postion Circuit Low Input
One mistake people make when cleaning a throttle body is they leave the TPS on, and the carb or throttle body cleaner seeps into the TPS and causes it to malfunction. It will usually clear up within a day when it dries out.

You may have the same result with the IAC valve. You need to hold the connector end up so the cleaner doesn't seep into the solenoid portion.

Now the lean codes. Wether or not cleaner seeped into the solenoid, you just cleaned the thottle body. The fuel system adapts the IAC over time based on sensor inputs. So it gradually re-adapts as the IAC as it and the throttle get dirty. Now that it's adapted to the dirty throttle body, you just cleaned it and tried to run it on the old values. That's too big of a jump. What you need to do is reset the memory. You'll have to disconnect the battery 10 minutes, then reconnect it, and start the car up and let it idle 10-15 minutes. If no Check Engine light is on, take it for a drive. Around town, and on the highway. This will get the adaptives back on track and your OBDII monitors to go back to complete or ready status.

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95 GMC surburban keeps dying when in low rpm. I replaced the fuel filter and it ran good for a few days, then started crapping out again. I then replaced the spark plugs and wires and it ran great for...

First check for a vacuum leak. Any small loose hoses in the engine compartment? If not, suspect the idle air control valve. I have pasted test procedures for the iac below. Be careful not to confuse the tps with the iac. The tps is centered on the ybro5ttle body. The iac is more on the perimeter. An additional test I do after checking the valve is to plug it back in while it is still off the throttle body and verify that it actuates a little when the key is turned on. It should back up a tad to allow idle air through the passage for starting.

Disengage the IAC electrical connector.Using an ohmmeter, measure the resistance between IAC terminals A and B. Next measure the resistance between terminals C and D.Verify that the resistance between both sets of IAC terminals is 20-80 ohms. If the resistance is not as specified, the IAC may be faulty.Measure the resistance between IAC terminals B and C. Next measure the resistance between terminals A and D.Verify that the resistance between both sets of IAC terminals is infinite. If the resistance is not infinite, the IAC may be faulty.Also, with a small mirror, inspect IAC air inlet passage and pintle for debris. Clean as necessary, as this can cause IAC malfunction.

Fig. Fig. 2: Using an ohmmeter, backprobe terminals of the TPS sensor to check for proper resistances

Fig. Fig. 3: The TP sensor and IAC sensor are usually located at the side of the throttle body

Fig. Fig. 4: Idle Air Control (IAC) valve wiring and terminal identification

Disconnect the negative battery cable.Disengage the electrical connection.Remove the IAC valve. On thread-mounted units, use 1 1 / 4 in. (32mm) wrench and on flange-mounted units, remove the screw assemblies.Remove the IAC valve gasket or O-ring and discard it.To install:
Clean the old gasket material from the surface of the throttle body assembly on the thread mounted valve. On the flange-mounted valve clean the surface to ensure proper O-ring sealingInstall the valve with a new gasket or O-ring. Tighten the thread mounted assembly 13 ft. lbs. (18 Nm) and tighten the flange mounted attaching screws to 28 inch. lbs. (3 Nm).Engage the electrical connector to the IAC valve.Connect the negative battery cable.ecd523da-60e9-4928-9b74-9d90b47be2df.gif0996b43f802319fe-tedh1mdkpnm2cwqabpnjpaem-4-2.gif0996b43f802319ff-tedh1mdkpnm2cwqabpnjpaem-4-3.gif0996b43f80219b22-tedh1mdkpnm2cwqabpnjpaem-4-4.gif




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Have a 1996 Mitsubishi Galant and need intstuctions on how to replace the Idle Air Control Valve

You'll have to remove the throttle body to replace the idle air control (IAC) valve. First, disconnect the negative ground cable from the battery. Then remove the vacuum line and air duct intake. Then disconnect the IAC and throttle position sensor (TPS) electrical connections. Remove the coolant hoses that are connected to the IAC. Disconnect the throttle cable from the throttle body. Now, remove the 4 bolts that hold the throttle body to the manifold and remove. Be careful with the gasket located between the throttle body and manifold and replace it in the same position. On your clean work surface, turn the throttle body over and remove the 4 phillips head screws holding the IAC to the throttle body. Clean the parts with a dry cloth but do not use solvents on the IAC or TPS. That's it!

Dec 16, 2010 | 1998 Mitsubishi Galant

1 Answer

2001 taurus dohc codes 171 and 174 replaced MAF, DPFE and IAC. New plugs and wires cleaned throttle body and egr valve. Has high idle, surging on highway. Disconnect the IAC and it runs perfect,...

There is a large vac line coming straight down from the throttle body that goes to the PCV system. See if it has a hole in it. It is likely sucking air.

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Did the mechanic adjust the fuel injector if you have noticed ?

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