Question about 1989 Ford Festiva

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Spark plugs show that the car is running very lean. is there a fuel/air screw to adjust?

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SOURCE: car wont start or if started runs poorly 98 ford taurus 3.0

check the fuel pressure or sounds like mass airflow metter itself

Posted on Mar 04, 2009

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SOURCE: carb is acting weird cant seem to adjust

That is the choke adjustment,have you checked your timing on the motor and check and see if the vacum pod on the distributer is working. also check your vacum lines for any tears or cracks in them.

Posted on Mar 29, 2009

motor1258
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SOURCE: I don't know where the air/fuel mixture screw is on my carb

There should be one screw (I'm assuming it's the Carter YF carburetor 1 barrel) that's by itself away from linkages etc, more to center at base of carb where it meets manifold, that is angled approx 45 degrees going in to base. That should be your mixture screw. What symptoms are you experiencing anyway?

Posted on Apr 04, 2009

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SOURCE: Cylinder 3 will not fire. running lean...

If you look at your engine as a group of one cylinder engines, it will help. What is not happening in that cylinder? is the injector allowing fuel to enter? Is spark happening? Is the cylinder itself in good condition ? ( are valves opening/closing, is compression good) One of these items is missing there...you need to find out what and why.

Posted on Jun 08, 2009

jaysonemanme
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SOURCE: Changed the valve cover gasket spark plugs wires

a/c compressor bearings are seized

Posted on Jun 24, 2009

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2 Answers

Why the spark plug keeps burning after a couple of days.Then i renew it and it will happen again.


does it start every time
check list
running hot
too much revs and load
fuel mixture too rich /lean
coil problem
burnt valve
burning oil




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Jun 30, 2016 | Cars & Trucks

3 Answers

When i come to a stop sign or a red light the truck just shuts off


iac valve idle air control valve if it not easy to start or hard to start if you hold the gas pedal a bit it doesnt stall check the idle air control thanks pierre let me now

Oct 04, 2008 | Chevrolet 1500 Cars & Trucks

1 Answer

00 honda passport intermittent rough idle


called misfire.
that means its not holding closed loop status at idle
ever do a tune up on it?
old spark plugs dont work, they MISFIRE and idle fails.
all cars for 100 years ,same , gas engines.

it can also be, bad fueling. or a bad engine.
we check compression first
then spark then fueling;
in that order, engine can not run right out of that order.
so misfire.
too rich misfire.
or too lean.
we check that by gazing at the spark plug tips ,
black is rich, white is lean.
most cars are cream or very light tan color. normal.
learn to read the spark plug tips.

its and 2000, and the scan tool will show the car is not i closed loop
at idle, fix that first. and DTC errors like MISFIRE P0300 or bad idle.
the same scan too show LTFT, long term fuel trim.
if its way far from 0 , the fueling is wrong.
-3-5% is normal. -50 is stuck rich and misfiring.

Jun 07, 2014 | Cars & Trucks

1 Answer

When i first start my car up it runs a little rough. i have replaced spark plugs, wires, a code code comes up and says it is running lean. after the first start of the day it runs smooth until it sits in...


a code for lean or lean condition typically indicates a vacume leak ,lean refers to too much air or not enough fuel too much air or more air than expected "leans" the fuel mixture, usually a vacume leak or a leak in the air intake system is the problem also i would have the coolant temp sensor checked out

Nov 21, 2010 | 1998 Cadillac DeVille

1 Answer

I just replaced the O2 sensor in my 1996 Honda Accord EX and the check engine light came back on saying that the car is "running lean." What does that mean and where do I start to look on how to fix this...


If you are near a chain auto parts store, they may reset your computer free; call them.
Running 'lean' means the fuel-air mixture is not ideal and the amount of fuel being injected is less than it should be relative to the air coming in. Running rich is the opposite. A lean burn can cause excessive heat and do some damage if extreme enough. The discoloration of the spark plugs will sometimes show this condition by having deposits that are a bit too light; they should normally show a beige or light brown coating after some miles are on them.
I think the computer should somewhat compensate for a dirty air filter but it wouldn't take long to check it.

Oct 01, 2010 | 1996 Honda Accord

1 Answer

How do i get more power from my 1975 cadillac eldorado engine ,also shes running too lean so need the mixture screws adjusting,are these in or out also the air filter is new thanks


The air/fuel mixture screws are usually capped off and the adjustment might not be possible, but if the air/fuel mixture screws are exposed then turning them in will lean out the fuel mixture, and turning the air/fuel mixture screws out will en-rich the fuel mixture.

With the engine fully warmed up and at normal idle speed adjust the air/fuel mixture screws one at a time, and turn each air/fuel mixture screw in until the engine just begins to mis-fire, then back out the air/fuel mixture screw one and a half turns to two turns to achieve a smooth idle.

Be certain that the air and fuel filter(s) are not plugged up (there might be a fuel filter inside of the fuel pump as well as the fuel filter/stone at the fuel inlet to the carburetor) and keep in mind that the minimum octane requirement for that engine is 91 octane, and 92 octane is the average octane rating for the premium higher grade fuel, so a bottle of octane booster added to a full tank of fuel will greatly improve the way the engine idles and performs.

That engine should have an electronic HEI (High Energy Ignition) distributor with the large distributor cap and with the ignition coil inside of the top of the distributor cap, and keep the tune-up parts in good condition and replace them when they wear out. The tune parts would consist of the distributor cap, ignition rotor, spark plugs, spark plug wires, and the spark plugs should be gapped at .045 in.

For better performance from your El Dorado a 1 inch spacer under the carburetor will really help a lot if the hood clearance will allow it, and you will need to set the ignition timing to 10 degrees before top dead center, and adjust the accelerator pump on the carburetor for maximun pump efficiency so that as soon as the throttle is opened there is two healthy squirts of fuel from the accelerator pump, and they should squirt as soon as the throttle is opened, and if the throttle can be opened and the accelerator pump does not squirt fuel at the same time as the throttle is opened, then there will be a lag or stumble from the engine on take-off and a severe loss of engine performance. (The accelerator pump must pump fuel into the carburetor at the exact same time as the throttle is opened)

For better performance check the adjustment of the secondary throttle linkage, and let me know if you require assistance with any of the proceedures.

Be sure that the vacuum lines to the EGR valve are correctly routed and that the EGR valve is not operating at idle.

Also, that engine has a plastic timing gear that was used for the camshft timing gear, and I would seriously suggest that it is changed before trying to get any performance from that engine.

Other than those modifications, the engine would need a better camshaft and the catalytic converter removed to increase the performance of that engine.

Here are some images to help assist you.


Fuel Pump Filter:

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Rochester Carburetor Secondary Adjustment:

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Jul 10, 2010 | 1976 Cadillac Eldorado

2 Answers

OBD2 METER READS ENGINE TOO LEAN


Lean running condition A lean running condition means that the air/fuel mixture is unbalanced, and that the engine is getting either too much air, not enough fuel, or a combination of both. Optimally, this ratio should be around 14.7 parts air to 1 part fuel by mass, at low or cruising loads. This ratio is known as stoichiometric for gasoline. Ideally, at WOT, you should aim between 11.5:1 (Rich best torque at WOT) and 13.3:1 (Lean best torque at WOT).
Running lean, like having your spark timing too advanced, creates much more heat during the combustion process. This can lead to piston seizure, a hole in the piston, melted spark plug electrode or other complications due to overheating. You will not be producing peak power, and your exhaust will also emit more oxides of nitrogen, arguably one of the worst byproducts of gasoline combustion for our environment.
Common causes of a lean running condition are an improperly tuned carburetor, clogged fuel line, clogged fuel filter, or a vacuum leak.
Preforming a plug chop is a good way to find out if your engine is running too lean, as you will see a powdery white residue on your spark plug in the presence of a lean condition.
On the other end of the spectrum, richer ratios will also cause lost power, however this will most likely be accompanied by black smoke (around the 9:1 fuel/air ratio area), and fouled spark plugs.

May 30, 2010 | 2002 Saturn VUE

1 Answer

I have a 2001 Ford Taurus that shows PO302 and PO171. Can anyboby help me with these codes as my car is running very badly? It is hesitating and running very rough, I would like to solve this problem very...


P0302: Cylinder #2 misfire.
P0171: System too lean, (bank 1)
The first may be a bad spark plug or the wiring to it. If it has been some time since the engine has had a tuneup, change all spark plugs and plug wiring. Check the air cleaner and replace if dirty. If it runs much better, recheck the codes again. If the car has 100k miles or over, it wouldn't hurt to replace the O2 sensors as they do wear out (even though the codes don't show that at this time). Replace the fuel filter as well. Running some injector cleaner through in the fuel will help too. If still having problems, check the system fuel pressure as the pump may be on the verge of failing. Again, the codes don't show this as a problem yet. Good luck.

Apr 12, 2010 | 2001 Ford Taurus

2 Answers

22R Carb at high altitude


Yes, Colorado is much higher in altitude. Do to higher altitude the barometric pressure is less than sea level by a long shot. Lower barometric pressure mean that less air is entering your engine. Which in turns mean that your engine is now running richer than it was at a a lower altitude. So I recommend checking you engine timing, and adjusting your carbs air/fuel mixture. yes this means that you may need to rejet. but first there is a screw on your 22r's carb that you must adjust to lean the air mixture just right. I have had a stock 22r carbortor before and never had to rejet it. i probibly should have but it ran fine at sea level and all the way to about 10000 ft. after 10000 feet i had to lean the fuel mixture to even alow the engine to run. This screw that you must turn is hidden due to toyota not wanting you to tamper with it and burn your engine to the ground by running your engine to lean. it has a metal plug on the passenger side of the carb about the size of a pencil eraser. you must drill that out and then you can adjust the air fuel mixture. Clock wise is to lean the air fuel. and Counter clock wise is to richen the air fuel mixture.A good rule of thumb is to turn the air/fuel screw all the way clock wise and then back out about 2 and 1/2 turns. That is the factory adjustment. you may only need 2 turns out. Best of luck i hope you get it running perfect. Try this adjustment first then if it still runs rich then think about rejetting.

Here is a picture of what i am talking about.

#1 is the air/fuel mixture, #2 and #3 are cold and warm idle screws.
#4 is a A/c idle adjustment.

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Sep 04, 2008 | 1987 Toyota Pickup

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