Question about 2002 GMC Envoy

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What makes my rpms drop when heat is turned on?

Wouldnt start so bought a battery, now rpms drop when heat or air is turned on

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The throttle body needs to be cleaned, grime in this area prevents the throttle plate from closing completely and allowing air to enter, making the air/fuel mixture lean. Make sure to clean the front and back sides of the throttle body. Also, disconnect the battery during the cleaning process to allow the computer to reset and relearn to the cleaned throttle body.

Posted on Nov 20, 2012

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Posted on Jan 02, 2017

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1 Answer

How to adjust the fuel and air mixture on a 1982 ford 4.9 six cylinder, carter carburetor.


There should only be 1 screw located at the base of the carb facing outward.

The method I use requires a tachometer. If you don't have a tachometer then you can use the "by ear" method, though it's not as accurate.

With the engine off, start by turning the screw all the way in, then back it out 1 and 1/2 turns. This usually give you a baseline to start with.

Start the engine and get it up to operating temperature, make sure the choke is fully open, and have the air cleaner and all vacuum lines installed.

Using the tachometer (or ear) turn the screw (usually out) until the RPMs increase. If they don't increase by turning the screw out, then try turning it in.

Eventually the RPMs will stop climbing while turning the screw (as said earlier, usually out).

THEN turn the screw the opposite direction (usually in) until the RPMs JUST start to drop off. That should be real close to the optimum setting.

This setting is ONLY for the base idle air/fuel mixture and is NOT for anything else.

Hope this helps.

Feb 16, 2015 | 1982 Ford F 150

1 Answer

My car wouldnt start and i m wondering if its the battery or electrical.


I suspect that the battery was boiling from uncontrolled charge rate. Have the battery load tested and have the alternator charge rate checked.

Jul 22, 2013 | 2007 Cadillac CTS 3.6L

1 Answer

I bought a new battery but my car still wouldnt start


You may have a defective starter solenoid, this is the common symptom, a click and no engine turn over. Have a shop diagnose this before any parts are replaced but i feel sure the starter solenoid is the problem here. The solenoid is mounted to the top of the starter motor which is bolted into the transmission's bell housing.

Sep 11, 2012 | 2001 Hyundai Elantra

1 Answer

Heating problems


replace the heating core but change the antifreeze first and clean the system and make sure there's no stop leak in the hoses. you will need to flush the heater core out completely several times to know for sure.

Mar 06, 2010 | 2004 Chrysler Sebring

1 Answer

RPMS drop wants to stall somtimes and hesatates in


I'd be curious to the miles on the engine, possible worn rings, poor compression. Start with basics first, be certain there are no vacuum leaks, next look to your fuel system; possible failing fuel pump (low fuel pressure) dirty fuel filter? (I'd start with the filter first, cheapest fix if it is the issue) other concerns could be injectors, plugged or failing (poor fuel spray) run a fuel systems cleaner for several tanks see if it will improve; but change that fuel filter first. Also the volts dropping off would make sence if the engine RPMs drop way off, too slow of a speed the alternator will make little if anything.
I hope this may have helped,
Tom

Oct 02, 2009 | 1994 Jeep Grand Cherokee

1 Answer

Install new motor in 91 jeep 4.0L all new parts (water pump ,rad, hoses, plugs... ran fine going down hill started to over heat.. when to a shop and they check thermostat. seem ok replace and drove home...


You probably have an air lock. Remove a heater hose and get all the air out. Then run it with the rad cap off until it warms up. You should see the water level drop when it finally goes, or if you got the air out with the heater hose, it should be okay.

Aug 09, 2009 | 1991 Jeep Cherokee Limited

1 Answer

Over heated and once cooled, it wouldnt start but turns over


make sure u have gas in it lol no really check ur oil to see if there is water in it if there is blown gasket or cracked block or head. if not hold it to the floor and crank on it

Jul 26, 2009 | 1995 Honda Accord

1 Answer

Gauges, windows, mirrors, and radio wont work while running


This is not a typical automotive problem. This is a serious electrical issue.... maybe related to ignition switch or emission control module. I don't think you'll find a simple answer other than taking it to a dealership for service.

Jan 14, 2009 | 1996 Jeep Grand Cherokee

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