Question about 2006 GMC Envoy

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Low idle Idle goes up and down when stopped at the light charging system and battery are good

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  • GMC Master
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I would try cleaning the Mass Air flow ,no check engine light?

Posted on Mar 19, 2014

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Posted on Jan 02, 2017

  • 59 Answers

SOURCE: low oil pressure 93 GMC P/U w/350 motor w/205,000 miles gauge

While engine is running, open the cover where you add oil to engine and see if you see a good flow of oil, if good flow, could be as easy as replacing oil sending sensor. got to realize that if poor maintenance history your engine may not be building enough pressure at iddle to move your hydraulic operated valves, only when you rev it up it will pump enough to run smooth. if running engine too long, you may cause more damage to other engine components such as crankshaft and cam shaft bearings. if you can spare a few bucks, have a good mechanic check your oil pressure with a mechanical gauge. another cheap option is to replace oil pump. last resort if you love your truck as much as we do,replace engine or rebuild it. At 205,000 this is a normal symptom, other than timing chain problems, most engines don't make it that far. hope this helps!

Posted on Mar 01, 2010

  • 225 Answers

SOURCE: oil gauge goes from 20 idle to 40 running then back to 20 stop

low oil,bad oil,or to light of oil

Posted on Mar 14, 2010

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  • 474 Answers

SOURCE: my 03 yukon xl is having a issue with entire

Check all grounds ie motor to body ground strap connections for corossion, battery to motor ground, battery to body ground. You have to check under bolt to see if there is coeossion. Bad grounding can cause all sorts of electrical problems

Posted on Jul 30, 2010

  • 1311 Answers

SOURCE: 2006 envoy at idle of 500 rpm, voltage meter shows

This is too low an idle speed, it should be around 620 RPM. You probably need to have the throttle body cleaned.

Posted on Nov 03, 2011

ginko
  • 19396 Answers

SOURCE: truck shuts down when it goes to idle

Hi.

Check idle air control system. The system comprises a valve that allow extra air into the engine when the engine is idle. If the valve is stuck, if there is a problem with IAC wiring or solenoid or if the vacuum hose connected to the IAC has a leak you get engine running rough and turning off when idle.

Check air intake and sensor (MAF and AIT). Replace air filter. Air intake problems may result in rich mixture and in engine turning off.

Check EGR and PCV valves. These parts may cause rough idle. When the problem is EGR or PCV you usually get troubles also when driving.

Posted on Dec 15, 2011

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Idle drops way low with fan,lights,ect..., on@ operating temp195, IAC is good power,no leak, power from computor;yes,under load, lights ect..,what am I overlooking? 91GeoMetro 3 banger


The electrical load on the alternator will pull the engine RPM down. It takes 10 H.P. to run the alternator. The only recourse to low RPM at idle would be to install a larger diameter pulley on the alternator. Extended idle could result in low battery charge rate. Should be fine at hi way speed. The alternator will not put out below 750 Rpm.

May 20, 2017 | Cars & Trucks

1 Answer

96 cadillac eldorado etc battery not staying charged when the car is started the battery goes up to 14 when driving and press brake voltage drops 11-12(car may even die) and to 13+ if u give it gas


Does the vehicle start after sitting over night or do you need to jump start it . Is the charge light on ( batt. symbol ) at any time ? Serpentine belt good , tensioner good ? Battery cable connections good an tight and no corrosion ? Battery also good ? That is normal for battery voltage to jump up to 14 volts after starting , alternator is replenishing the battery after starting ,that draws down the battery . Going down to 11 or 12 volts when stopping and almost stalling isn't a charging system problem . You have a idle problem , IAC - idle air control valve or dirty air passage , a vacuum leak . Giving it gas and it going up to 13+ the alternator is working . Your best bet take it to a qualified repair shop and have it check .

Jan 27, 2017 | 1996 Cadillac Eldorado

1 Answer

After i changed my alternator on my 2004 ford f150, my check charging system light and battery light comes on. also, my idle is really low now when i come to a stop, sometimes truck dies do to low idle. I...


sounds like a dirty plug connection somewhere, unplug what plug ends you pulled off and try cleaning the contacts inside plugs, good luck this should help

Dec 29, 2010 | 2004 Ford F150

1 Answer

Upon startup engine idles rough then speeds up and returns to normal idle .After a couple of minutes the volt light comes on then no power then a complete shut down.Starts back up for a while then shuts...


OK, the volt light means that the alternator is not charging the battery. It could mean the battery is shorted out, or the battery is bad or low on charge due to an alternator not charging.

Replace the Alternator and battery as indicated by standard voltage output tests under load.

The computer in the car will not operate the engine properly on low voltage.

Fixing the charging system, may resolve the rough idle (meaning that it may be trying to relearn after data was erased by low voltage of the battery), and the speed up.


Try the charging system first, and once that is repaired, reevaluate the engine driveability and speed and idle smoothness, after it relearns.

Good luck on this repair.

Nov 06, 2010 | 1999 Buick LeSabre

2 Answers

Rpm goes down when turning on da lights


It might have a bad Idle speed control motor.

Apr 02, 2010 | 1994 Honda Civic

2 Answers

Battery lights is on & don't idle correctly


These trucks have what is called a smart charge system. It normal for the alternator light to elluminate when the truck requires no charging or the idle is low. The most likely reason you have low idle is throtttle body coking which requires cleaning or a bad idle air control valve. Also clogged injectors will cause a low rough idle but if that was the case misfires would show up and can be seen while they happen using a diagnostic data scanner.
And the first thing we always look at is the air cleaner. If you have a K/N filter the oil can contaminate the MAF senor. If the sensor cannot see and feel the air then it won't be able to add fuel causing a low idle, The MAF can be sprayed with brake cleaner to clean it. Usually you will get a p0171 and or a p0174 if the maf was causing a lean condition.

Mar 25, 2010 | 2006 Ford F-150

2 Answers

1998 k1500 5.7l 105a alternator. replaced


Now change the sulfated batery for a new one.
Vitally

Sep 09, 2009 | 1998 Chevrolet K1500

2 Answers

Idle Problem when you slow down of come to a stop idle goes low


THis has happened to me in the past. My fix was to clean the throttle body. The problem began after my battery died. The computer was defaulted back to its original settings after replacing the battery. Once I cleaned the throttle body, everything was fine. This happened at about 85,000 miles.

Feb 21, 2009 | 2003 Chevrolet Silverado 1500

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