Question about 2004 Ford F250

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Blown spark plug

Was replaced and was running fine. now engine is idleing rough and its fine at high speeds. when the gas throttle is released it idles like the real end is going out.

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Check the rubber fittings at the throttlebody and intake they have a tendency to split and leak

Posted on Nov 22, 2008

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2001 altima stalls at intersection or when AC is running and car is hot


No to the high octane gas. Regular gas is fine. Higher octane gas is more resistant to ignition and is better suited for high compression engines to prevent preignition and detonation. Check or replace your idle air control valve since the car stall at idle when the throttle blade is closed. If the IAC is not working it won't allow for air to bypass the throttle plate. Also have your throttle body cleaned.

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Engine runs rough and gets worse when accellerating


PROBLEM TROUBLE AREA
Rough idle, stalls or
hesitate on acceleration :
.Spark plug faulty
. High-tension cords faulty
Ignition problems:
• Ignition coil
• Igniter
• Distributor
. Incorrect ignition timing
Vacuum leaks:
. PCV valve and line.. .
. EGR line..
. Intake manifold.
• Throttle body
• ISC valve
• Brake booster line

• Throttle body
• Brake booster line
. Incorrect idle speed
. Reset timing
. Adjust valve clearance
. Check fuel system . Check air cleaner
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Smell of gas passenger side engine compartment


Hi try some new spark plugs leads plus check for a possible vacume leak. thnx

Apr 16, 2013 | Ford Taurus Cars & Trucks

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Car idles and runs rough intermittently after engne is warm.


it could be plugs and or high tention leads, causing missfire best way to check these is better at night open the hood of the car, run engine and see if you are getting a loose spark, that will be your high tention leads it could also be that when they get hot, they expand and start reducing the power of the spark to the plugs if you find that these will need replacing, to test spark plugs, get a pair of pliers and preff a pair of rubber gloves, pull the leads off each plug one at a time, if there is no change on one you pull of, that plug needs replacing, continue till you have checked all of them, hope this helps

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2 Answers

My xj6 runs at high rpms and accelerates on its own


None of those possible problems have anything to do with idle speed. The first thing might be a very weak throttle return spring. The next would be a sticky throttle cable or foot feed pedal that isn't moving freely. Another possibility is a vacuum leak somewhere. Did changing the spark plug in #1 cylinder help the misfire? If not, you may have a partially plugged injector. Fixing the misfire will only increase idle speed some more. Look for an idle speed motor near the throttle body that is supposed to raise idle speed when the engine is cold and lower it back when the engine warms up. Check to see if it is holding the speed too high. If the throttle position sensor tells the computer where the idle speed motor is set, then it could have an effect on idle speed if the sensor is bad. The position sensor is just a fancy potentiometer. Hope some of this helps.

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check for a lose spark plug lead or cracked elecrod insulation on spark plug

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2000 Nissan Sentra rough idle


a rough idle/high idle is indicative of a malfunctioning TPS(throttle position sensor) this is located on the throttle body ,is attached with (2) screws/bolts to the throttle body housing right off the butterfly shaft. it has either 2 wire or 4 wire plug. the replacement part can be purchased at locale auto parts store. I would also agree that a full service and tuneup be done. this will help with performance and will increase the fuel efficiency. please rate this...thanks

Sep 25, 2008 | 2000 Nissan Sentra

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