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2003 GMC Envoy, how to check vacuum lines

Cruise control stopped working, engine runs rough especially when idling

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  • GMC Master
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Look at the vacuum hose on the cruise control actuator. It may have gotten gummy or lost it's grip on a connector.

Posted on Jul 24, 2016

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Posted on Jan 02, 2017

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SOURCE: 2003 Silverado rough idle, idles good after "check engine" light

Check your o2 sensor voltage, those trucks are real bad for o2 sensors, and yes if one sensor is reading 0mv, the others will start to drop out, and the vehicle will run very, rough. You also may check fuel system pressure, should be almost 60p.s.i. If its alot lower, Id be looking into a fuel pump. If that vehicle is drive-by-wire (no throttle cable), the throttle bodies get very dirty and cause that concern also. Id start by having the vehicle scantested.

Posted on Feb 07, 2009

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SOURCE: engine cooling fan runs all of the time

the fan relay is bad

Posted on Mar 06, 2009

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SOURCE: 2001 ford escort, rough idle, runs smooth while

Your IAC may be defective, first check the canister purge valve by removing the large hose off the charcoal canster and plugging the hose with a bolt or something you can fit into it, then try it also check PCV valve and see if it's bad. there are more things to check like fuel filter fuel pump and or fuel strainer if fuel tank but would need to have more information to help.

Posted on Aug 28, 2009

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SOURCE: 1990 GMC Sierra 1500 pickup. Windshield wipers, Cruise Control

May want to look at replacing the wiper circuit board.It is located on the firewall adjacent to the wiper motor and has a some what square black cover with 3 torx screws and wireing harness pluged into the side.We had a truck that every time you washed it the wipers would stay on until it dryed out.You can try removing it and spaying it down with contact cleaner just watch the brease on the two contact tips.Well hope this helps.

Posted on Feb 05, 2010

  • 2926 Answers

SOURCE: My 2003 GMC Sierra Idles Rough And Cut Off

Before replacing the O2 sensors, I would check the fuel pressure. You may also try to have someone pull a trouble code from the powertrain control module to verify why the engine light is on. Do not replace any parts until this is done, otherwise your going to be guessing at the root cause, and it will get expensive with part replacement.

Posted on May 12, 2010

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Vs commodore cruise control switches on but won't set. It also cuts out in idle erratically especially on roundabouts.


If your engine has a running fault possibly a misfire it will automatically stop cruise control from working you need to sort out your idle issue 1st Check all your vacuume hoses around engine if V6 Check for loose or perished/cracked hoses If nothing found get a Holden Garage involved it may be cheaper in the long run.

Dec 13, 2016 | Holden Cars & Trucks

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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

Where is the vacuum hose on a 2005 gmc envoy


There are several. They go to the transmission, the idle control valve, the fuel cannister, cruise control fuel pressure regulator and inside to the heater/ ac controls There is a place on the intake manifold where a vacuum hose will connect to that distributes vacuum to all the other places vacuum is needed.

Jul 08, 2014 | 2005 GMC Envoy

1 Answer

2003 envoy smells like fumes and idles rough


have you checked for a vacuum leak?pcv attached,no leaks around plenum,engine coolant temp sensor reading right.

May 31, 2012 | 2003 GMC Envoy Xl

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

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Envoy 2005 XL Cruise control not working


Your dealership should have seen any underlying codes. Most Cruise controls I've worked on are used on the vehicles vacuum. that is where i would start, because on a grade your engine uses more vacuum pressure thus taking from some where else.

Jan 12, 2012 | GMC Envoy Cars & Trucks

1 Answer

Idles rough after engine is warm


check ALL vacuum lines for cracks/holes and replace as nesissary

Feb 25, 2010 | 2003 Mazda Mazda6

1 Answer

Cruise control stopped working on 2003 envoy what part do I need I need


I would check the fuses first. Then the switch down by the brake pedal. If not that then have someone plug a OBD II reader in and find out for sure.

Feb 01, 2010 | 2003 GMC Envoy Xl

2 Answers

Rough Idle while stopped and low speeds


heve utried adjusting the trottle , just put your foot on the accelerater and hold at just under 1000 revs if shaking goes then thats your problem should idle at just under 1000rpm

Oct 10, 2009 | 2003 GMC Envoy Xl

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