Question about 2005 GMC Envoy Xl

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While driving and holding steady speed, the rpm's fluctuate 200-300 rpm's

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How many miles are on this vehicle? Is the engine light on? If so, can you have the codes read? RPM fluctuation can be anything (both caused by mechanical or electrical changes or failure/s). Fuel pressure, engine compression, 02 sensors, worn or sticking TAC unit, vacuum leak, poor fuel quality, dirty or defective MAF sensor, clogged air filter, old spark plugs, excessive exhaust back pressure, stretched timing chain, over due oil change, worn or damaged throttle pedal, or worn out spark plugs. These can all cause your symptoms. Let me know if you have anymore questions.

Posted on Feb 28, 2014

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1995pontiac,firebird6cyl,sputters at 2000rpm


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Here is the OBD2 emission system drive cycle test procedure.
Engine coolant temp must be below 70c (158f) before starting the engine for either the first or second trip
The fuel level should be less than 1/2 full
First trip:
Start engine, idle for at least 1.5 minutes
Drive 3 minutes, hold b/f schdl: 1.5-2.0 msec, selector lever "3rd" eng rpm 1,800-2,000 A/C switch:ON Hold the recommended b/f schdl range. Allow road speed to vary as necessary.
Drive at 55-65 mph for 1.5 min b/f schdl 2.0-3.2 msec, selector lever "5th" Engine rpm 2,200-3,000
IGN "off" for at least 10 seconds (not more than 5 min)
Dive at 50-60 mph for 3 minutes Selector lever "4th" keep engine speed above 3,000 rpm Allow speed to vary if necessary. Do not decelerate for more than 3 consecutive seconds. A/C switch ON.
Drive at a steady state cruise of 53-58mhp b/f schdl more than 1.8 msec selector lever "5th" eng rpm 2,400-2,600
Downshift to "4th" and decel more than 5 seconds without breaking, then idle for 1 minute.
Drive two minutes b/f schdl less than 2.0 msec Accelerate to 41 mph, decelerate to 34 mph, accelerate to 41mph. Do not completely release the accelerator. A/C switch off.
Idle 1 minute in park or neutral
Drive two minutes Steady state cruise at 31-44 mph. Selector lever "4th" A/C switch OFF. Hold the accelerator pedal as steady as possible. Allow speed to change if necessary.
End of first trip. Turn the key off the begin the second trip.
Second trip:
Start engine, idle for at least 1.5 minutes
Drive 3 minutes, hold b/f schdl: 1.5-2.0 msec, selector lever "3rd" eng rpm 1,800-2,000 A/C switch:ON Hold the recommended b/f schdl range. Allow road speed to vary as necessary.
Drive at 55-65 mph for 1.5 min b/f schdl 2.0-3.2 msec, selector lever "5th" Engine rpm 2,200-3,000
IGN "off" add four gallons of fuel
Dive at 50-60 mph for 3 minutes Selector lever "4th" keep engine speed above 3,000 rpm Allow speed to vary if necessary. Do not decelerate for more than 3 consecutive seconds. A/C switch ON.
Drive at a steady state cruise of 53-58mhp b/f schdl more than 1.8 msec selector lever "5th" eng rpm 2,400-2,600
Downshift to "4th" and decel more than 5 seconds without breaking, then idle for 1 minute.
Drive two minutes b/f schdl less than 2.0 msec Accelerate to 41 mph, decelerate to 34 mph, accelerate to 41mph. Do not completely release the accelerator. A/C switch off.
Idle 1 minute in park or neutral
Drive two minutes Steady state cruise at 31-44 mph. Selector lever "4th" A/C switch OFF. Hold the accelerator pedal as steady as possible. Allow speed to change if necessary. I especially like the part where they want you to add four gallons of fuel. Not three gallons, not five gallons, four gallons. Gotta love those Nissan engineers. ...and of course they state that if the trace is not followed exactly (i.e. you botch the acceleration/deceleration) you have to start all over again from scratch

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1 Answer

My 2004 Odyssey at 1000 to 1500 rpm will growl and the tach will fluctuate quickly. If we raise the rpm at higher speeds it does not happen. Local dealer cannot resolve the issue...its driving us...


Try replacing TPS (Throttle Positioning Switch) These are basically a rheostat and after time they develop a wear/hot spot - usually right around highway cruising position. When they develop a hot spot you get hesitations and RPM fluctuations

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2 Answers

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Yes..... The TPS can cause this!!! Another sign of a failing TPS is for the rpm's to fluctuate up and down by 100-300 as you drive down the interstate at a steady speed on a level surface.

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1 Answer

Rpm's jumping


Might have a bad IAC motor

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1 Answer

RPM near 3000 on my 1999 Lexus RX300


What is your speed at 3k rpm? What rpm would you estimate was previously 'normal' for highway cruising? If your Lexus is auto trans, it could be two things, it's either not shifting into the highest gear, or it's possibly slipping in gear (although I would think that would cause the rpms to fluctuate, not stay at a steady 3k). If it's a stick shift, again, it could be clutch slippage, but my choice from your description would be not shifting into the highest gear. Bring it up to highway speed slowly, counting how many shifts it makes, I.m guessing it's a 5 speed auto, but I'm not sure about that.

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1 Answer

2002 Grand Cherokee engine revs


Since you have a Laredo this should be where it is going in and out of overdrive. The reason is because 60mph is right at the end of the power range before going into overdrive. The other reason on your idle fluctuation is due to the cooling fan kicking on and off. Higher RPM's occur as the engine is trying to cool back down after reaching optimal temp. I due have a partial solution if you want better performance out of your jeep and will help MPG. You can replace the spark plugs and air filter for both mpg and performance. Local auto store should be able to recommend platnium or iridium plugs for your jeep. But K and N is the best air filter to replace it with. It will cost around 50 dollars but it has a lifetime warranty and is cleanable. If you decide on new plugs make sure to spend a few extra bucks and get some with a 3 to 5 year warranty. Just replace them before the warranty is up. Stephen

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1 Answer

Driving me nuts


If it is automatic transmission with overdrive the lock-up torque converter is kicking in and out causing the rpm to fluctuate.Could be just the converter or maybe the overdrive going out.

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1 Answer

Envoy 2004 idle speed


Hi
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.

Jul 09, 2008 | 2004 GMC Envoy

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