Question about 2004 GMC Envoy
At standstill the idle speed is erratic and fluctuates up and down when driving at normal speeds ok apart from a lack of power on occasions any ideas ?
your problem seems very easy :) hope this one work with your envoy. Just buy AC DELCO carburetor tune-up conditioner.
How you use it: engine running , AC off please
1. detached the big black airflow hose which is attached in the mannifold of the engine block.
2. ask your friend to step on the gas pedal and set the rpm steady in 2000 rpm only.
3. then spray vigorously in 8 seconds the inside circle opening of mannifold while your friend steady step on gas pedal with steady 2000 RPM only.
4. after you spray, let your freind continue on gas pedal with 2000 rpm for 15 more seconds.
5. attached back the airflow big black hose to the manifold and you are ready to roll with your AC on.
if this one doesnt work, please scan your envoy by scanner called TECH II. and find out.
Posted on Jul 18, 2008
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Posted on Jan 02, 2017
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May 05, 2017 | Cars & Trucks
Jan 26, 2011 | 2004 Hyundai Elantra
Here are the most common causes of idle surge, stalls at stops, slow idle speed, erratic idle speed, rough idle and engine hesitation (and other problems), it is in most cases the idle speed control air-bypass valve and or throttle valve and upper intake, these area's get full of gunk and combustion residue over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake
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