Why does my car hesitate at times when I press on gas?

Question

It's as if fuel is not getting through. This doesn't happen all the time, though. But is happening more frequently. I have a 1999 Ford Crown Victoria.

Answer 1

my guess would be the fuel filter, change it first since its the cheapest, next would be bad spark plug boots cracked, or spark plug gaps to wide, then lastly dirty fuel injectors....you could change the fuel filter, then when the car is real low on gas, maybe 1/8th of tank, put in 2 bottles of fuel injector cleaner and drive it as long as you can without running out of gas....if that doesnt work then try the tune up...the fuel filter is $10.00 at walmart and the cleaner is about $4.00 a bottle at walmart as well.....

Answer 2

Car Hesitates

Answer 3

Here's you reason. A clogged fuel filter, I bet you have ran down all the gas in your tank at one point or another. When you do that, the sludge gets sucked up into your fuel line and tries to pass through the filter. When it can't it doesn't get enough fuel and hesitates. Try getting a new fuel filter, depending on what size engine (possibly a 5.0L 302) it could be in-line which then you lucky. If not it is in the tank $$$$$ bug bucks. Also check your muffler and catalytic conveter. Sometimes the hony-comb type inside if the muffler falls apart and doesn't let exhaust gases through which makes the car stutter a bit. I would bring it to your mechanin and have him test drive and tell you what he thinks then bring it somewhere else and see what they say. Good Luck.

Answer 4

Dirty throttle body. Take off the air cleaner and expose the throttle body. Get a spray can of throttle body cleaner and spray it in using an old tooth brush to scrub around. Be careful not to drop the spray tube or the brush. Wipe around with a rag and you're done. Put in a clean air filter and a can of fuel injector cleaner in a full tank of gas and you're done. You'll save a fortune at the mechanic's.

BTW, spray several times until clean. It will take some time for the car to start when you're done but don't fret over it. Once it starts you're problem will, most likely be gone.

Answer 5

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my suburban did the exact same thing when I bought it. I am really picky about buying good gasoline I went down to chevron, filled it up with super unleaded, and it ran perfect. I used several tanks of chevron super unleaded to let the techron help clean the fuel system, then figuring that was enough super, I tried costco regular. The next day it was back to hesitation sometimes off a stop sign or traffic light, on the freeway, I would step on the gas and there would be a slight delay before engine responded. I drove that tank down half way, filled it up with chevron super unleaded, and it ran perfect. I have run chevron super unleaded for over 15,000 miles in that suburban since then, I keep the tank full so the fuel pump in top of the tank stays cool. I full up the 43 gallon tank at 1/2 full. and keep the oil clean. hope this helps, good luck.

Answer 6

Well, many possablities. Besides those above, it could be this:
When you press the fuel petal, it sucks gas into the carburetour or the injectors. But when it opens up further, it takes a while for the suction to pull the new fuel to the engine from the tank. It also takes a while for the fuel pump to speed up. I would still take your car to a mechanic and have it checked out.

Answer 7

I have Crown Vics myself and the first thing I would do is have the throttle plate and bore cleaned. In the mean time, you might consider a BG-44k engine treatment to remove built up carbon deposits in your engine. Also add Chevron Techron to your fuel tank at every oil change. The basic condition you describe is a lean engine operating condition in which there's not enough fuel getting into the air/fuel mixture (just like you thought). It is a very common problem on all cars as they build up carbon deposits at various places in the engine.
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Answer 8

I had this same problem about 6 months ago. It would run just fine when i slowly pushed on the gas but if i pushed hard on the gas it would hesitate. It turned out to be a bad tps(throttle position sensor) which is not very expensive. also if you had not replaced them recently i would replace spark plugs and also spark plug wires. Sometimes, what feels like a hesitation is actually ignition misfire rather than lean misfire. The causes of ignition misfire may include: Dirty or worn spark plugs Bad plug wires Weak ignition coil Wet plug wires If you replace the spark plugs and wires and it is still stumbling or hesitating then start checking for dirty fuel injectors (cleaning the injectors often fixes this),bad MAP (manifold absolute pressure) sensor,bad or dirty MAF (mass airflow) sensor low fuel pressure (leaky fuel pressure regulator or weak fuel pump),vacuum leaks (intake manifold, vacuum hoses, throttle body, EGR valve) or bad gasoline (fuel contaminated with water or too much alcohol). Some additive you can run are a techron fuel treatment and also an additive called HEAT. The HEAT will remove the water in the fuel and the techron will clean your fuel system. Hopefuly this information helps you out

Answer 9

Check your fuel filter.Also, be sure you are using fuels that have acceptable levels of detergent in them (like Mobil) You might have carbon build up on valves. Try Chevron FI cleaner in your tank. Is this car a throttle body injection car??? It may need a new fuel pressure regulator installed on it.

Answer 10

this symptom is most frequently associated with your fuel injected vehicles needing a fuel injector cleaning service, however there are many other possible causes most of which are tune-up related , maybe get a tuneup and see what they find. aslo it is a ford and they've been known to throw even the best ford technitions .