Question about 2003 Chevrolet Silverado 1500

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Why does engine not idle when braking

Engines goes dead when i stop at a red light especially when air conditioning is on

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  • Chevrolet Master
  • 1,250 Answers

Iac valve not doing is job.Trottle plate gap dirty.tps sensor faulty but not coding.
more details need like tune up,spark plugs, rotor, fuel pressure etc.

Posted on Aug 02, 2013

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6ya6ya
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Posted on Jan 02, 2017

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rat32chevy
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SOURCE: engine stalls when brake is pressed

is this while in motion or setting still? if in motion it could be the torque converter clutch. I'm just trying to help

Posted on Jul 01, 2008

fizzerdan
  • 12 Answers

SOURCE: 1994 s10 service engine soon light

Have you had the truck scanned for codes? If so, what was the code, codes? Why did you replaced those listed parts. Can you hear any hissing noise coming from the engine or engine compartment?

Posted on Sep 04, 2008

  • 1 Answer

SOURCE: high idle with a/c on.

Cars are SUPPOSE to idle higher when the A/C is on...(especially 134a systems)..the idle will go up and down as the compressor cycles on and off.

Posted on Nov 19, 2008

  • 521 Answers

SOURCE: my 2006 chevy cobalt 2.2 liter sputters

Fault with the IAC valve.there maybe a trouble code associated with it also./ Go to your nearby autozone or auto parts retailer and ask them to put a scanner to the car....make note of the codes if any are found. the IAC valve i usually locate don the throttle body and can be removed for inspection and sometimes cleaning using a good throttle body cleaner spray and a pipe cleaner brush.

Posted on Aug 04, 2009

  • 22 Answers

SOURCE: Runs Ok...engine warmed up...come to red light or

Sounds to me like the Throttle Position Sensor. Thats usually what makes the throttle "rev" But that is not going to make the oil pressure drop. Pull the codes from your car and look them up online. sometimes there is an extra fuse u can add to your panel and turn the key on and it will flash your codes via the check engine light. i.e. if the light flashes 2 times then small pause then 1 time and long pause that is code 21. if there isnt a extra fuse you can usually jump it with a paperclip and pull the codes. not really sure how to do that with yours. but im positive Google knows ;)

Posted on Oct 20, 2009

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Our oldsmoible silhoute has had many issues , we have spent $1800 trying to fix it


A backfire is usually an indicator of either timing or vacuum. Though you didn't include the year or engine size of your vehicle, the timing is not adjustable, and more than likely NOT your issue. This brings us to what it most likely is: Emissions System/ Vacuum/ Air Induction. The slower your vehicle goes (the less open your throttle is) the MORE vacuum there is present in the intake manifold. The faster your vehicle goes ( the wider open your throttle is) the LESS vacuum there is in the manifold. When you open your throttle, it lets more Air into the engine, which, in turn, displaces the vacuum. A vacuum leak allows air into the engine, which replaces the much needed vacuum for the car to run properly at idle and lower speeds. But when the vehicle is driving faster, the symptoms of the vacuum leak may not be noticeable, due to the fact that the engine is utilizing the extra air intake. The symptoms, however, return when the vehicle returns to idle. Using a 3/4" hose, you can put one end of the hose to your ear and probe the engine with the other end. Using the hose a stethoscope, listen for any "hissing" sounds coming from the intake or hoses, to detect a vacuum leak. Spraying Brake Cleaner / around the manifold, while the car is parked and idling, and listening for the engine to surge as the Brake Cleaner is being sucked into the engine, is one method that can be employed, though, I must say, with extreme caution. An open spark plug wire can cause the spray the ignite! There is also the option of having a smoke test done by a qualified technician, to locate a leak.
An Engine backfire is merely a condition where the cylinder in question has a poor air /fuel and spark ratio or timing. A leaking Fuel Injector can cause a backfire as well, such as the backfire that is present when too much starter fluid is used. First: get the codes pulled for your Check Engine Light for free at Autozone or Orielly's. Look for O2 sensors to be reading a Lean condition , which indicates a vacuum leak, or not enough fuel ( as in clogged injectors) if it a clogged injector, the code should say "misfire" and indicate which cylinder(s) has the issue. If the code has O2 sensor "Rich" condition, you are looking at too much gas being dumped into one or more cylinders, or not enough air. Though, by your description, it is more than likely a mere vacuum/ air issue.
MR. VINCENT, ASE MASTER TECH, MOBILE MAN CAN ,LLC

Oct 18, 2016 | Cars & Trucks

1 Answer

2003 Ford Explorer XLT Wants To Stall At Low Idle,, especially when at a stop light


How does it idle in park , does it run ruff or smooth? Are any lights lit on the dash , check engine etc. ? Could have a partially plugged IAC air passage .idle air control (IAC) valve ! The engine computer uses the IAC to control idle , when under a load such as when put into gear the computer raises the idle ! It does this by allowing more air to by pass the closed throttle into the engine raising the idle ! If these air passages clog they restrict the air flow an cause a idle problem ! Now if it runs ruff at idle in park you could have vacuum leak ! Rough Idle How to Fix Ford Taurus Engine Stalls at Stop Signs

Mar 19, 2015 | 2003 Ford Explorer

1 Answer

Fluctuating idling when hot


hi. turning on the air conditioning does normally take between 7to10 brake horse
power from your engine ...............

Mar 03, 2014 | Toyota Avanza Cars & Trucks

1 Answer

Gauges stop working, engine won't idle


See the YouTube video on how to repair broken solder joints on your instrument cluster connector. This takes about an hour and solves a number of intermittent problems. I think it may be under "no start" problems.

Feb 18, 2013 | 1999 Dodge Caravan

1 Answer

When i first crank the car it idles at like three or so then goes to zero and cuts of it does this a few times especially if i push the brake, i have learned to rev engine lightly and press brake and put...


Might be a leak on your brake booster (this will most probable give you a hard brake pedal or a "sucking sound " when applying brakes) also check the vacumm pipe from the engine to the brake booster. It might have a leak, so when you press the brakes it influences the air mixture.

Dec 14, 2012 | 2000 Nissan Maxima

1 Answer

Idle good when cold, hotter it gets the worst it idles especially when sitting at stop lights


simple test for a vacuum brake booster
star and run the engine at idle without applying the foot brake
if it gets worse when the foot brake is applied , it is a vacuum leak in the booster ( replace the booster )
otherwise check for failed vacuum hoses including under dash control lines , vacuum leak at the manifold or EGR unit

Apr 16, 2017 | Chevrolet Astro Cars & Trucks

1 Answer

I have a 1989 ford bronco with a 302 that ideals up and down and dies out when park in red light


A number of things could be the problem here:
  1. Bad plugs - fouled plugs would cause erratic idling
  2. Bad wires - also would cause erratic idling
  3. Bad or worn distributor cap
  4. Bad MAF (Mass Air Flow) sensor
  5. Bad TPS (Throttle Position Sensor - this controls the idling speed under all conditions. A bad TPS would idle fine under certain conditions ie engine cold, engine warm with AC on etc but could be bad when truck is warm and at a stop.

Oct 10, 2011 | 1989 Ford Bronco

1 Answer

Knocking when engine gets hot and car stopped


The fan clutch can make a knocking noise when it tries to engage. At idle it will have a rhythm to it when it tries to engage. You will have an over heating condition and the air conditioning may not work properly.

The fix is to replace the fan clutch and reprogram the engine control module.

Mar 14, 2010 | 2003 Chevrolet TrailBlazer

1 Answer

My car slams when put into drive. is it the idle


Yes, sounds like the idle speed is too high. If you keep driving like that, you will fry the torque converter / turbine. Since idle is computer controlled, you will have to take it for service tune up. There is one possibility that the rich, high rpm idle used for cold start is not disengaging properly after the engine warms up. Air conditioning will raise the idle speed by a couple hundred rpm, so avoid using it until you have the problem fixed. BTW.....warm engine rpm in idle, and neutral should be around 700-800. Anything over 900-1100 will result in a hard shift into 1st gear and dragging at stop lights.

Feb 16, 2010 | 2002 Chevrolet Malibu

1 Answer

I have a 2004 2500 hd silverado with duramax engine. the vehicle intermidentaly lunges with air conditioning on and brake applied.


It sounds like the computer is compensating the idle when the a/c compressor cycles on. The compressor cycles on and off when the a/c is on, which is normal. When the compressor kicks on, it puts an additional load on the engine, which in turn lowers the idle, especially at idle sitting at, say, a red light. Having the brakes on also adds another load to the engine as it uses a lot of engine vacuum to keep the brakes applied. When the engine surges, like your describing, that is the trucks computer sensing the additional load put on the engine, and is adjusting the idle higher to compensate for it. Theres really not a lot you can do about it, unless maybe switch off the a/c at red lights. I should add that if it's a severe "lunge" or surge, enough that your fighting to keep the truck from moving, I would check for maybe a vacuum leak, or even possibly take the truck to a dealer and have it checked over. Hope this helps.

Jul 01, 2009 | 2004 Chevrolet Silverado 2500HD

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