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Rough idle and running.

Tiny
POKKINGBILL
  • MEMBER
  • 2001 MERCURY VILLAGER
  • 3.3L
  • V6
  • 2WD
  • AUTOMATIC
  • 101,000 MILES
On cold start van runs good. When it warms up it has develops a rough idle, sputters and dies after some time. I've changed plugs, wires, cap and rotor (the van needed it regardless). I've checked mass air flow sensor and it checks out fine. I've thought about fuel pump but have not checked pressure yet. Need to get tee to put in fuel line to do so. Only reason I'm Leary on it not being the fuel pump is that I can still get the rpms over 4000 even with the sputtering. When I ran codes it had an p0600 code and a p0300 code with no check engine light. After I did tune up I deleted codes and they have not returned and no check engine light is on. Kinda at a loss at the moment so any help would be appreciated. Thank you, Bill.
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Sunday, March 1st, 2015 AT 7:29 AM

21 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Check fuel pressure with a gauge auto parts rent it and check for a vacuum leak. it may be low fuel pressure making engine lean causing problem.

THis guide should help us

https://www.2carpros.com/articles/engine-vibration-at-idle

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Sunday, March 1st, 2015 AT 8:29 AM
Tiny
POKKINGBILL
  • MEMBER
  • 3 POSTS
I just got done doing that and at idle it holds about 36-38 psi and when you step on the gas it goes up to 40-42 psi. Not positive but I think that is within specs.
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Sunday, March 1st, 2015 AT 9:13 AM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
With key on and engine not running should be 37-43psi engine running shold be 30-38 psi p0600 means that there is a communication problem with the pcm to tcm. 0300 is random misfire which is why it runs rough. Have a pro scan it so he can do some further tests on scanner which the cheaper ones can't do. It may be another sensor bad in engine. If you can't find a vacuum leak or air leak prior to engine then that is your best bet as these random misfires are extremely hard to find.
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Sunday, March 1st, 2015 AT 10:40 AM
Tiny
POKKINGBILL
  • MEMBER
  • 3 POSTS
So fuel pressure is good. I've sprayed carb cleaner around the intake looking for leaks and nothing. I've checked hoses for vacuum leaks and nothing. You think it's possible that it may be just bad gas? People have also said they have experienced this same problem and it turned out to be the distributer.
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Sunday, March 1st, 2015 AT 11:18 AM
Tiny
BOB CORBIN
  • MEMBER
  • 1 POST
I just had a 2001 villager in the shop. Good fuel pressure. No codes except ran rich. Turned out the air filter was torn on the bottom and the screen for the maf sensor was mostly clogged. After cleaning ran great.
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Wednesday, December 18th, 2019 AT 2:35 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,643 POSTS
Please feel free to use 2CarPros anytime!
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Saturday, December 21st, 2019 AT 11:40 AM
Tiny
JOSENISSAN
  • MEMBER
  • 1 POST
  • 2000 MERCURY VILLAGER
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 162,251 MILES
Check engine light came on for knock sensor. Replace
knock sensor and intake manifold gaskets, after everything was done when starting car notes car idles rough idle goes up and down and stalls check
for faults only found fault for transmission related none related to engine. Notes a hissing sound like a vacuume leak check all line in front and back o.K?
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Saturday, December 21st, 2019 AT 11:40 AM (Merged)
Tiny
ZACKMAN
  • MECHANIC
  • 4,202 POSTS
Here is your vacuum diagram. Trace all hoses.


https://www.2carpros.com/forum/automotive_pictures/55316_villagervacuum_1.jpg

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+5
Saturday, December 21st, 2019 AT 11:40 AM (Merged)
Tiny
FOOL4NO1
  • MEMBER
  • 1 POST
  • 1999 MERCURY VILLAGER
  • 6 CYL
  • AWD
  • AUTOMATIC
  • 128,000 MILES
Mercury Villager has 128000 miles. I have had distributor replaced, spark plugs replaced (expensive ones), throttle body cleaned, vacum leak sealed (reconnected), air filter replaced. When I am at a stop and engine is running, it has a rough idle, almost like a "shudder". It does not act like it is going to die or cut-off. When I put the gear in park it does not do this. Shifts gears fine (transmission is smooth), very good gas mileage. Only the slightest of hesitation when pressing on the gas from a stopped position.
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Saturday, December 21st, 2019 AT 11:41 AM (Merged)
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Start with a compression test. You have done the plugs, what about the wires. Make sure there is no other vacuum leaks. Beyond that, you may need help from a shop to track it down.

Roy
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Saturday, December 21st, 2019 AT 11:41 AM (Merged)
Tiny
TBURY1106
  • MEMBER
  • 1 POST
  • 1999 MERCURY VILLAGER
  • 6 CYL
  • 200,000 MILES
My van is idling very rough and wont go above 2 rpms. I have tried heet, fuel injector cleaner, looked at cap and rotar and they were fine. I tried to put in 5 gal more gas incase it was bad gas. I don't know what else to try. Any suggestions? 99 mercury villager
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Saturday, December 21st, 2019 AT 11:41 AM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Engine running rough or misfiring can be cause by the following:

https://www.2carpros.com/articles/engine-misfires-or-runs-rough

1.Defective spark plugs
2.Inadequate spark/coil,defective spark plug wire.
3.Lack of compression
4.False air leakage.
5.Faulty fuel injectors.
6.Insufficient fuel pressure.
7.Contaminated fuel.
8.EGR valve that is leaking.
9.Oxygen sensors.
10.Throttle position sensor.
11.Manifold absolute pressure sensor
12.Mass Airflow Sensor
13.Idle air control valve

Note: If it doesn't apply disregard it-
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Saturday, December 21st, 2019 AT 11:41 AM (Merged)
Tiny
DCB1971
  • MEMBER
  • 2 POSTS
  • 1997 MERCURY VILLAGER
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 121,000 MILES
97 mercury villager van 3.0 motor I did a complete tune up, changed all filters, pcv valve, checked for vacume leaks, rechecked all the fireing orderthe engine runs rough at idle but smoothes out when you start driving, no engine codes are present.
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Saturday, December 21st, 2019 AT 11:41 AM (Merged)
Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
You may have an injector not providing enough fuel at idle. Try some Techron fuel system cleaner by Chevron. This will clean injectors and valves.
Let me know
Thanks for Donate
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Saturday, December 21st, 2019 AT 11:41 AM (Merged)
Tiny
WHEELCHAIRDUDE49
  • MEMBER
  • 73 POSTS
  • 1993 MERCURY VILLAGER
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 100,000 MILES
The car idles rough and stalls when you start it up cold or hot. Just changed the air filter on it. Check engine light is on but don't have an OBD1 scanner. Any suggestions?
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Saturday, December 21st, 2019 AT 11:41 AM (Merged)
Tiny
BMRFIXIT
  • MECHANIC
  • 19,053 POSTS
Check it for tune up and vacuum leaks

Trouble codes are retrieved from EEC system through MIL (CHECK ENGINE light) located on instrument panel. MIL is used with Diagnostic Test Connector (DTC). See Fig. 2 . To retrieve codes, use the following procedure:
Turn ignition key to ON position. Disconnect the diagnostic connector, located near starter,in engine compartment.Fig. 2 . Jumper between Blue/White and Grey/Blue terminals as indicated in illustration, and wait 2 seconds.
Remove jumper wire and reconnect diagnostic connector. Record DTC, MIL flashes.

READING CODES
All trouble codes are 2-digit numbers. PCM outputs codes one digit at a time. These codes indicate current faults in system and should be serviced in order of appearance.

Scan tester, if used, will count pulses and display them as a digital code. If using MIL, trouble codes are displayed as light pulses from CHECK ENGINE light. When using MIL, pay attention to length of pauses in order codes correctly. See Fig. 1 .
Pass Codes
Code 55 indicates system passes that portion of test. If Code 55 is not retrieved, proceed to CIRCUIT TEST corresponding with trouble code that is output.

CLEARING CODES

To clear codes from PCM memory when using MIL (CHECK ENGINE light), disconnect jumper wire and reconnect harness connectors. If using scan tester, follow tool manufacturer's instructions. If problem has not been corrected or fault is still present, code will immediately be reset in PCM memory.


https://www.2carpros.com/forum/automotive_pictures/99387_Graphic2_263.jpg



https://www.2carpros.com/forum/automotive_pictures/99387_Graphic1_541.jpg

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Saturday, December 21st, 2019 AT 11:41 AM (Merged)
Tiny
WHEELCHAIRDUDE49
  • MEMBER
  • 73 POSTS
What kind of code scanner do I need for the mercury villager?
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Saturday, December 21st, 2019 AT 11:41 AM (Merged)
Tiny
BMRFIXIT
  • MECHANIC
  • 19,053 POSTS
An OBDII reader will not work
need an older scanner

check with local repair shops most they still have it and should be able to get the codes for you
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Saturday, December 21st, 2019 AT 11:41 AM (Merged)
Tiny
WHEELCHAIRDUDE49
  • MEMBER
  • 73 POSTS
Just put new plugs and cap and rotors on it. Still stalls at idle and seems to be starving for gas when under a load. Changed a vacuum hose that was cracked. Still stalls. Any other suggestions?
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Saturday, December 21st, 2019 AT 11:41 AM (Merged)
Tiny
BMRFIXIT
  • MECHANIC
  • 19,053 POSTS
Staving for fuel
check for fuel pressure
replace fuel filter too

stalling issue check MAF sensor
that also may be a cause of a lack of performance under load too
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Saturday, December 21st, 2019 AT 11:41 AM (Merged)

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