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Idle is terrible untill it warms up.. rpm's rev high then low untill it warms

I have changed plugs and wires and valve cover gaskets as well. There is no longer oil leaking in the cylinders. It does sound like there is a vacuum leak which I can't locate. But, if the vacuum was causing the issue it should always run bad, (warm or cold).

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Posted on Jan 02, 2017

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SOURCE: 99 escort zx2 low idle and stalls after hi rpm, hi idle w/ fan on

Idle Air Control is the most likely problem, although there could be something else. But I would check that first on any ford with these symtoms.

Posted on Dec 28, 2008

michigan man
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SOURCE: At startup my 94' F150 will oscillate from high to low idle

I had this problem once on an econoline van and it was the plantum gasket but before you change this check all the vacuum lines and get a digital volt meter and test the voltages on the mass air flow sensor and if you have to change the plantum gasket auto zone can print you out a diagram stating all you have to remove to replace it

Posted on Jan 09, 2009

  • 4669 Answers

SOURCE: my truck idling low

What engine?

Posted on May 16, 2009

  • 1 Answer

SOURCE: oil on front spark plugs

I just had this problem with my 2002 Ford explorer. I took it to the shop and it was the valve cover gasket. This was causing some slippage and white smoke from exhaust.

Posted on Nov 25, 2009

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SOURCE: 2000 ford super duty 7.3 diesel will not cold start

you need to have the engine coolant switch checked,since the computer relies solely on sensors,the ect tells the computer how cold or hot it is so the computer will make it a rich or lean mixture to start the engine,if it tells the computer that it is 75 degrees the computer will lean the mixture like starting a car in the winter without a choke.

Posted on Jan 06, 2010

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Why is there a miss in cyl. 1 that only occurs at idle speed, which seems low (750 rpm)?

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When my car warms up it will not stay started it will die unless i keep my foot on the gas petal to prevent it from dying

Change the sir-filter and fuel-filter. Also clean out the air-filter box the filter sits in. If the problem persists, remove the air-intake duct that goes to the throttle body for obstructions. Also look at the air-horn and throttle-plate. Is there carbon in the air-horn and throttle-plate? If so, carefully clean the airhorn and throttle-plate with a clean, dust-free rag sprayed with automotive solvent.

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How to replace a valve cover gasket on my 1987 Ford Ranger with a 2.0 L engine

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Changed valve cover gasket new wires now car idals rough

what year?
old posts, Im doing all Suz posts back to Jan1.2013
Ok this is called misfire.
misfire can happen at any speed or RPM even IDLE.
im sure you had the spark plug wires/ or COPS connected
wrong. and is fixed , now.

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The issue is one of over-fast idling. First thing is to check coolant level in the engine. Make sure that the coolant is at the 'max' in the reservoir (1:1 mix of water : antifreeze). Low coolant would preve nt the ECU from detecting the car is at operational temperature. When the car is cold the ECU extends injection times to keep the car running but when warmed up the injection times are again shortened to reduce engine speed at idle. Also at idle, the Idle air control valve (IAC) on the throttle opens to allow air to by-pass the closed throttle plate. Check that as the engine gets warm that the coolant hoses to the throttle body become warm (showing that no blockage is preventing coolant circulation). Check that IAC air passage is clear and that valve can open freely. If the IAC coolant hoses are blocked or the valve is jammed open this would account for the very high idle speed. If everything looks OK check the PCV hose from the valve cover to the throttle and make sure that there are no blockages in it.

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V6? does it get any better when it warms up? Does RPM rev hi to low or does it sit at one speed and shakes? Hows the plugs? first thing first, buy a can of carb/choke cleaner $ 5.00 . Remove any plastic motor cover plates that would expose the motor. Spray cleaner around the base of the intake manifold and all mating areas of the intake manifold. ( not into the air intake) does the motor rpm change or rev up? if yes, you have bad intake gasket. also spray and check all air (vacuum) hose connections for proper fit and no cracks. Check plugs and note color and condition of each and what cylinder it was from, a brown paper bag color is normal, a super clean look is lean possible coolant leak, a burnt or melted electrode is early detonation timing, oil carbon deposit bad rings or valve guides,seals, wet is to rich , air fuel mix. Several things cause this, check all seals,air lines first,air filter, cracked or split intake tube, gasket check, does it run rough at cold idle only ( possible temp sensor ) you can check alot of things to eliminate without spending cash,

Jan 10, 2011 | Ford Taurus Cars & Trucks

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Starts cold wont start when warm. I have changed the coil, plugs, wires, distributer, rotor, and ignition module. the idle also messed up at the same time, its idling high enough to spin the tires at a...

now is the time to start checking for vacuum leaks. I just fixed a 96 F-150 today with a cracked intake manifold. Look at all of your vacuum lines under the hood, that may include lines to the vacuum booster, the pcv valve, the egr valve, the air box, and in rare cases, even the battery box. If you can't find any leaks there, get a can of ether, start the truck, and spray it at the points where the intake meets the heads. If the RPM revs high or dips really low, you have a leak either in the manifold itself (like a crack) or the gasket has failed and it's time for a new one. I hope this helps.

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