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Not idling and seems to be running rich using a lot of fuel

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  • Motorcycles Master
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Adjust idle screw if adjustable, adjust idle speed screw if available.

Posted on Jul 21, 2010

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1 Answer

Car starts and blows black smoke and use a lot f gas and want idle.


Your car is running very rich, meaning the cold start sensor may be blown. a car uses a sensor to see how cold the engine is as the colder the engine the more fuel it needs.

Mar 24, 2015 | Cars & Trucks

1 Answer

1995 f-350 runs rich and won't idle?


If this is a gas engine, check for air leaks on the intake manifold and every vacuum line and switch you see. Use a pump spray water bottle and with the engine running, spray around seams and such.

A change in rpm or stalling will indicate the leak.

What is probably happening is the air leak is making the system run rich to balance the air/fuel ratio. This would make more fuel dump into the engine where it is not needed.

Another possibility is a loss of the signal from an O2 sensor. The O2 sensor sends a signal to the ECM to set the fuel demands and let the engine controls know that the fuel ratio is rich-normal-lean to adjust to optimum running condition.

Now if this is a Diesel, the hard to start condition would be due to an inoperative glowplug timer or worn glowplugs. If this is the mechanically injected model, the injector pump is timed to get the fuel into the cylinder either earlier or later to change the fuel ratio. Your diesel injector pump would need to be retimed. It will help across the board.

Please rate my info and let me know how you solved this.

Mar 03, 2013 | 1995 Ford F350

1 Answer

2000 lincoln town car runs rich, with alittle misfire. It idles high.


Probably a clogged fuel injector. Try some fuel injector cleaner or replace the injectors.Could be a lot of other problems too. Bad O2 sensor, bad fuel pressure regulator. Need to do more diagnosis.

Jun 18, 2012 | Lincoln Town Car Cars & Trucks

1 Answer

Raw fuel


Is your check engine light on?
Your truck is running rich(obviously), I'm wondering if your CEL is on because it will come on, if the O2 sensor/s are bad.
And that would make your truck run rich(upstream sensors)

May 23, 2012 | GMC Sonoma Cars & Trucks

1 Answer

1991 camry running rich on fuel and stalls when idling


Do the following to clean the intake, this should help with the rich run. Also change the oil, it will be full of fuel.
Buy a can of throttle valve cleaner (it is made by CRC) from the local auto parts store, NEVER USE CARB CLEANING SPRAY, IT DESTROYS THE ANTI-STICK TEFLON COATING, spray it into the air intake through the throttle body of the engine until you have used about half the can, you will need to hold the idle up while you do this, it will try to stall, after this shut the engine down and disconnect the Negative (-) battery cable for 5 minutes. The intake is now clean, if you continue to have the idle speed control problems you may need to seek the help of a professional

Feb 02, 2012 | 1991 Toyota Camry

1 Answer

I bought a second car for utility use; B6000, 1994, p/u, standard trans. Only when starting and running when the engine is cold, it runs very rough and difficult to idle. At normal operating temperatures...


a coolant tempurature sensor will make it run to rich if it is bad. run rough at idle, and produce black smoke, engine may stall out. it also causes retarded timing, slow idle speed, cold hesitation or stumble, poor fuel milage. good-luck!! if light is on check for problem code. this will guide you in the right direction. if no scanner, any auto parts store will scan for free. repost if need be. have a good day!!

Aug 13, 2010 | 1994 Mazda 2WD B Series Pickup

2 Answers

Running rich, smelling rich


You may have a bad fuel injector or in need of a tune up badly. The early fuel injection (throttle body) had a single fuel injector that would clog and not spray fuel in a mist but would dump fuel. Does it run rough at idle? That is a good indicator. Some are rebuildable but I would suggest replacement. If you have not had a tune up in a while that should be done too.

Jan 24, 2010 | 1994 Pontiac Grand Prix

1 Answer

Proper tuning


use carb spary to clean out the throttle body right at the butterfly plate.you will see a lot of carbon buildup at the plate at idle.
the tbi should be very nice and clean there.
the carbon blocks air flow at this spot when the plate is at idle.

Jun 18, 2009 | 1985 Chevrolet Chevy

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