Question about 2004 Toyota Tundra

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High idle at start, using tremendous amount of fuel

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How high is the idle speed? I know Tundras, especially the V8s have a high idle speed in order to heat up the engine because it runs better at a higher temp and also because the heat wont blow until the engine is warm

Posted on Oct 17, 2008


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1 Answer

Gs400 idling rough

The reason for traction light to come up is due to high idle. Set the idling screw to proper amount and the check light may go off.

Jun 23, 2013 | Toyota Cars & Trucks


Bad fuel economy and lumpy idling - possibly causes

<p><b><u><span>Excessive fuel consumption and 'lumpy' idling engine</span></u></b><br /> <p><b><span>Possible faults:-</span></b><br /> <p><b><u><br /></u></b><br /> <p><b><u><span>Coolant sensor </span></u></b><span><span> </span>- engine is signaled as being 'cold' all the time, not just at start up, causing ECU to set longer injection cycle </span><br /> <p><span><span>&oslash;<span> </span></span></span><span>Low coolant level can prevent sensor being able to detect coolant temperature</span><br /> <p><span><span>&oslash;<span> </span></span></span><span>Faulty 'open' thermostat allows coolant to circulate without regulation and perhaps prevents the engine from achieving normal running temperatures.</span><br /> <p><span> </span><br /> <p><b><u><span>FPR</span></u></b><span> - broken diaphragm allows fuel to enter the vacuum line and then into the inlet manifold. Additional source of fuel makes the fuel air mix richer causing a faster and lumpy idle.</span><br /> <p><span> </span><br /> <p><b><u><span>Vacuum leak </span></u></b><span>- 'high oxygen' signal from O2 sensor causes ECU to set longer injection cycle.</span><br /> <p><span> </span><br /> <p><b><u><span>O2 sensor</span></u></b><span> - 'high oxygen' sensor error causes ECU to set longer fuel injection cycle</span><br /> <p><span> </span><br /> <p><b><u><span>MAF</span></u></b><span> - 'over reads' in error the amount of air entering causing ECU to set longer fuel injection cycle </span><br /> <p><span> </span><br /> <p><b><u><span>IAT</span></u></b><span> - 'under reads' in error the temperature of incoming air causing ECU to set longer fuel injection cycle</span><br /> <p><span> </span><br />

on Jul 22, 2011 | Mercedes-Benz E-Class Cars & Trucks

1 Answer

High idle

It's probably one of two things , a vacum leak or a bad ground.

Dec 23, 2012 | 1989 Chevrolet C2500

1 Answer

93 monty idles high then dies on cold startup

I would check the idle air control valve. The computer controls idle speed by regulating the amount of air entering the throttle body by using the valve. It could be sticking or failing.
I am assuming you have a 93 Monte Carlo.

Oct 04, 2012 | 1999 BMW 318 ti

1 Answer

92 ford ranger when first started excessively high idle

Could be a vac leak, or a faulty idle air control valve on the throttle body.
The computer controls idle speed by regulating the amount of air entering the intake.

Sep 23, 2012 | 1992 Ford Ranger

1 Answer

I have a 1989 Ford Festiva, when I start it, my idle is very high. Then when I push on the gas pedal, the idle goes way down and stales out. Is this a choke problem?

It is a combinatioin of a choke problem...and settings called idle air mixture screw........the choke is adjusted too high.....(increasing the amount of fuel entering the engine)...and then it leans out (not enough fuel) for idle.........i would suggest that you take it to a mechanic who "tunes" carburettors...a sprecialist so to speak, as it is a dying art...or take it to the dealership.........this would be a last option......beacuse it does not have a computer...its a case of listening and observing what the engine does and how it behaves as the screws are it would be nearly impossible for me or anytone to be able to do it over a medium like this.......

Oct 25, 2010 | 1989 Ford Festiva

1 Answer

2000 Durango SLT 5.9Ltr. Will start but idles high, around 7000-7500. All dash lights come on and stay on for a while. Voltage gage drops to below charge range and then all of dash dies and Durango starts...

well the fast idle is 1 of 2 things, Either the throttle is stuck? or a super nasty vacume leak, Check all hoses carefully, if that proves good check intake leak. Something is allowing tremendous vacume into engine causing this high idle, The charging system is a whole nother story

Jun 17, 2010 | 2000 Dodge Durango

1 Answer

89 dodge shadow. hard start. normal idle cold, fast idle warm. sometimes it wont start until i hear fuel pump activate.

The car may be hard to start because it may need a normal tune-up. If the spark plugs are pretty used, they will slowly stop burning as much fuel because the spark slowly gets lesser and lesser. On a cold day the fuel is harder to ignite with a small amount of spark.
Normal idle when its cold means that your cars idle is probably too high. If you lower the idle, the choke on a cold day will keep the idle a little higher until the motor warms and then it will kick back off. If the idle is too high, it will run very rich, smothering itself with fuel, and causing the idle to stay low. When the car warms, its creating better spark when its warm, and with the idle being too high its running at a fast idle.
The car wont start sometimes can be the cause of a few things. If the ground is bad on the fuel pump, it wont make a good connection sometimes for when you turn the key on, the fuel pump dont pump the fuel to the engine. Another one can be that your accessory switch can be loose going to the fuel pump. I think its your ground though. Good luck! Hope this helps.
Have a nice day. -Steve

Dec 06, 2009 | 1989 Dodge Shadow

3 Answers

93 Buick Skylark is idling really high. New computer was installed, new throttle control sensor, and idle air sensor. It is still idling too high. Throttle control was cleaned and it is still idling high....

Idling high in the skylark could be something to do with throttle control, or idle air control valve, other possibilities could be a vacuum leak or mass air flow sensor, it could also be a faulty system recently replaced. When you vehicle idles high it means it is getting more fuel than its suppose to in the fuel/air mixture, most times to much fuel in the mixture is caused by a leak or malfunction in the air delivery not allowing the appropriate amount of air in.

Aug 28, 2009 | 1993 Buick Skylark

2 Answers

Very high idle using up to much gas can smell gas

it could be your throttle position sensor. it will be on the intake where your throttle body is located.

Dec 31, 2008 | 1988 Jeep Cherokee

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