Question about 1998 Ford Mustang

2 Answers

1998 ford mustang 3.8 running lean rough idle and it cuts off. had tune up changed battery had it checked by 4 different mechanics they don't know what it is. help they say there are no leaks maf sensor is clean, alternator is good car is not over heating, fuel filter is not clogged. what else could it be?

Posted by on

×

Ad

2 Answers

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • Ford Master
  • 15,575 Answers

Did the 4 mechanics read an code's in the engine computer . I'am assuming they had a scan tool hooked up to the vehicle . You probably won't know the answer to these questions . What was the data for the fuel trim's ,short an long term , are the O2 sensors switching normally , What is the fuel pressure ,did they check it ? What kind of mechanics were they ? Dealer , independant , back yard etc.... Without testing i'm not going to supply you with any guesses.
FORD V8 SYSTEM LEAN BANK 1 AND BANK 2

Posted on Dec 31, 2017

Ad
  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • Ford Master
  • 5,048 Answers

Oxygen sensors may be reading false rich making it go too lean .

Posted on Dec 31, 2017

Ad

6 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi there,
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.

Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.

Here's a link to this great service

Good luck!

Posted on Jan 02, 2017

  • 59 Answers

SOURCE: 97 Ford Ranger 4.0L V6 Idles rough only when cold

Orand

Ther is a air Idle control valve located on the side of the throttle body. unplug it remove it spray it and clean it with carb cleaner replace it plug it back in and you will be a Happy person again.

Lugnut61

Posted on Feb 01, 2009

  • 9 Answers

SOURCE: runs rough, black smoke, computer bank 1 burning too lean

Sounds like bad injectors, bad O2 sensors, and or too much fuel psi. Check the fuel psi against what the service manual says. If the fuel psi is too high, your regulator is bad. If the fuel psi checks out ok, you likely have a bad O2 or bad fuel injector(s).

Posted on Apr 15, 2009

pippall
  • 1486 Answers

SOURCE: ford 4.6 code po174 bank 2 too lean

O2 sensor faulty.

Posted on Jul 18, 2009

  • 104 Answers

SOURCE: Very rough or low idle on braking, and standing at

check timing, Carboned intake manifold orintake manifold runner screws could have fallen out.

Posted on Oct 20, 2009

  • 98 Answers

SOURCE: 04 mazda 6 lean condition

sounds like you have a vacuum leak. It is sucking in extra air from somewhere. possibly the intake manifold gaskets. The extra air coming in fools the computer / o2 sensors to believe it has a lean mixture then it will try to compensate for the lean mixture and add more fuel.

Posted on Oct 30, 2009

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Changing harmonic balancer


Nope! Why don't you give the mechanic a tune to see if it's running rough because of lean mixture, fail ignition coils, worn spark plugs....could be one of those things. Because when yours is rough at idle, it means the mixture is not right, more likely be lean or one or more cylinders not igniting properly. Got nothing to do with harmonic balancer. But do check motor mount for cracks, but faulty mounts only give you excessive movement that you can really feel it KICKS when you change from P - R - D.

Apr 29, 2014 | 2003 Chevrolet Venture Passanger

1 Answer

1998 mustang cobra runs good cold but as soon as it hits running temp it runs a little rough with loss of power


Check your fuel pressure and your fuel filter . Also check your pids.
which the most important one is your short term fuel trim while it's running ,it will be either rich or lean . I know it sounds silly but when the numbers are positive it's lean and when there negative it's running rich.

Feb 11, 2014 | Cars & Trucks

1 Answer

2000 ford e350 CNG van p1131


Check the help link provided below:----

Ford runs lean and idles rough?
http://technoanswers.blogspot.in/2012/02/ford-runs-lean-and-idles-rough.html

==========
Thanks.

Nov 26, 2012 | 2001 Ford Econoline

1 Answer

My Chevy 2500, 2001 runs rough when it cold outside


It can be issue with low fuel pressure,the fuel pump is getting old both needs to be checked.Also get the IAC valve checked.
Go through the related help links with similar problem,it may help:---
Click the links below:---
Engine Idles Rough and Dies? http://whatisbyme.blogspot.in/2012/05/1994-lexus-es300-engine-idles-rough-and.html

-------
van idles rough? http://howtobyme.blogspot.in/2012/01/2004-ford-freestar-van-idles-rough.html

--------
runs lean and idles rough? http://technoanswers.blogspot.in/2012/02/ford-runs-lean-and-idles-rough.html

-----------
Car still runs Rough after tune up?

http://howtobyme.blogspot.com/2011/12/car-still-runs-rough-after-tune-up.html

-----`-
2006 kia rio runs rough http://technoanswers.blogspot.com/2012/10/2006-kia-rio-runs-rough.html

-----------
Idle flair is noticed on car? Rough idle? car will not idle? Erratic idle speed? http://technoanswers.blogspot.in/2012/02/idle-flair-is-noticed-on-car-rough-idle.html

----------
Rough idle, staling and Erratic shifting? http://technoanswers.blogspot.in/2012/03/rough-idlestaling-and-erratic-shifting.html

---------
These details will help.
Thanks.

Nov 06, 2012 | Cars & Trucks

1 Answer

92 NISSAN WITH BOGGING AT 2800 3500 RPM AND AT LEVEL SPEED 4CYL AND 5 SPEED


For this types of problem,there are few help inks to troubleshoot the problem.Click the link below to go through the troubleshooting procedure to resolve the issues :----Idles rough and quits when gas pedal is pressed less? http://technoanswers.blogspot.in/2012/01/1999-ford-f-150-idles-rough-and-quits.html-----------van idles rough? http://howtobyme.blogspot.in/2012/01/2004-ford-freestar-van-idles-rough.html
--------------runs lean and idles rough? http://technoanswers.blogspot.in/2012/02/ford-runs-lean-and-idles-rough.html
-----------Car still runs Rough after tune up? http://howtobyme.blogspot.com/2011/12/car-still-runs-rough-after-tune-up.html
------------Idle flair is noticed on car? Rough idle? car will not idle? Erratic idle speed? http://technoanswers.blogspot.in/2012/02/idle-flair-is-noticed-on-car-rough-idle.html
----------High rpm in neutral? Inconsistant high RPM in neutral? http://technoanswers.blogspot.in/2012/02/high-rpm-in-neutral-inconsistant-high.html
------------Engine Backfires? http://technoanswers.blogspot.in/2012/02/jeep-backfires.html----------- Nissan stalls and bucks on Acceleration?

http://technoanswers.blogspot.in/2012/02/nissan-pathfinder-stalls-and-bucks-on.html

-----------
Nissan Pathfinder Backfires? http://technoanswers.blogspot.in/2012/02/nissan-pathfinder-backfires.html
---------How to adjust rpm? http://schematicsdiagram.blogspot.com/2011/12/how-to-adjust-rpm-on-2009-dodge-charger.html
------------Engine cuts out at 3000 RPM? http://schematicsdiagram.blogspot.com/2011/12/engine-cuts-out-at-3000-rpm.html
----------This will help.Thanks.

Feb 17, 2012 | 1992 Nissan Pickup

2 Answers

1998 mustang 3.8 engine hards to start cranks forever before starting some hesitation while running


you could ck fuel pressure may be a clogged fuel filter or a fuel pump starting to go.

Jul 25, 2010 | 1994 Ford Mustang

1 Answer

2001 Elantra. I have had a tune up and replaced a flexpipe, also used carb cleaner in the gas tank, but still experience a rough idle and check engine light is on. It would go off for the better part of...


I would try replacing the fuel injector ,now the mechanical code,could be a valve spring, lifter ,or valve problem,but try the injector first.

Jun 10, 2010 | 2001 Hyundai Elantra

1 Answer

My 1998 v70 is running rough


posible coil pak is leaking current[ arcing] also turbos take a radically different spark plug than normal engine. poeple at part stores mix them up al the time

Apr 22, 2010 | 1998 Volvo V70

1 Answer

Engine mis-firing


Mass Air Flow Sensor or Intake Absolute Pressure sensor


e5677c9.jpg

Oct 07, 2009 | 1998 Ford Mustang

2 Answers

98 E-250 Rough Idle; codes p0156,p1131,p1151,p0301,p0171,p0174+


po301 thru po306 all misfire codes cylinder 1-6 remove plugs and replace them..... set the plug gap first
i suggest u replace the wires also if they never been replaced all these misfire codes can set the others and one is for the oxygen sensor ( 02s or HO2S) CIRCUT MALFUNCTION do u know how to check wireing systems
do the tune up plugs (set gap) .052-.056 change the fuel filter also. clear the codes hows it run
this info is for 98 E-250 4.2Litre
what engine do u have 4.2L or 4.6L i know it is a v-6 by the codes

Dec 15, 2008 | 2003 Ford E250

Not finding what you are looking for?
1998 Ford Mustang Logo

Related Topics:

366 people viewed this question

Ask a Question

Usually answered in minutes!

Top Ford Experts

Marvin
Marvin

Level 3 Expert

83772 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22413 Answers

gerry bissi

Level 3 Expert

4387 Answers

Are you a Ford Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...