Why does my GMC Envoy have a rough idle?

While there are a variety of reasons your GMC Envoy has a rough idle, the most common 3 are a vacuum leak, an issue with the spark plugs, or a problem with the ignition coil. See what others are asking about their GMC Envoy. Get answers from RepairPal’s community of auto experts and enthusiasts.

What happens when you blow your head gasket?

The most common end result of a blown head gasket is coolant mixing with the engine oil. To check for this, all you have to do is: Open the hood of the car. Pull out the engine oil dipstick. Check the color of the oil sticking to the dipstick. The color of the Oil will be a milky white color (like coffee with too much cream).

What makes the head gasket on a GM Truck work?

No compression on two side by side cylinders. The cylinder head gaskets on your GM pickup, van or SUV are tasked with keeping three very specific components of the engine separate from one another (among several things) and these three are: Coolant. Engine oil. Compression/combustion pressures and gases.

Why does my envoy have a gasoline smell?

Traced the gasoline smell to a leaking FPR, gasoline smell fixed but rough idle continues. I admit I didn’t check the intake bolts behind the little hose, but none of the other bolts were loose and I sprayed some starter fluid around that area with no change in rpm.

Who is the owner of the GMC Envoy?

GENERAL MOTORS, GM, the GM Emblem, GMC, the GMC Truck Emblem and the names ENVOY, and DENALI are registered trademarks of General Motors Corporation. This manual includes the latest information at the time it was printed. We reserve the right to make changes after that time without further notice.

Can a bad solenoid cause a bad ECM?

Generally, if you unplug the TCC solenoid at the transmission and the symptoms go away, you have found the problem. Sometimes this can be misleading, because you don’t know for sure if the cause is a bad solenoid, dirt in the valve body, or a bad signal from the ECM.

What should I do if my GM solenoid lock up?

Connect the alligator clip of your test light to ground. Unplug the wires at the case and place the tip of your test light on the terminal marked A. Do not depress the brake pedal. Computer controlled vehicles: turn on the ignition and the tester should light. All other vehicles: start the engine and bring to normal operating temperature.

What causes a transmission solenoid to stop working?

Any failure in the fuses, sensors or associated wiring can result in conditions that prevent the solenoids from working properly.

Where does a transmission shift solenoid mount on a transmission?

Your transmission shift solenoids mount on the transmission valve body that controls fluid flow through the various circuits and passages in the transmission.

Can a solenoid be replaced in a car?

In some cases, the solenoid is integrated into the valve body and isn’t serviceable. This means the entire valve body will need to be swapped out. Some high-end vehicles also have the TCM built into the valve body. Replacement of these units can be pricey.

What is the diagnostic code for Transmission solenoids?

Diagnostic Trouble Codes. Once the TCM detects a problem in the monitored systems, it sets a diagnostic trouble code that can be retrieved using a scan tool appropriate for the year and make of the vehicle in question. The trouble codes for transmission control components begin at P0700, and the codes specific to the solenoids range…

Who is the owner of the 2005 GMC Envoy?

2005 GMC Envoy/Envoy XL/Envoy Denali Owner ManualM GENERAL MOTORS, GM, the GM Emblem, GMC, the GMC Truck Emblem and the names ENVOY, and DENALI are registered trademarks of General Motors Corporation. This manual includes the latest information at the time it was printed. We reserve the right to make changes after that time without further notice.

How many seats does a GMC Envoy XL have?

Overview Seats 7 Door Count 4 Engine 275-hp, 4.2-liter I-6 (regular gas) Transmission 4-speed automatic w/OD Torque 275 lbs.-ft. @ 3,600 rpm

What’s the fuel filter on a Toyota envoy?

Just a pronounced misfire at about 500 rpm. Cleaned TB, run BG44k through tank. Cleaned Camshaft actuator solenoid. Was clean even after 200k, first time I’ve pulled it. Pulled plugs, look fine. Have about 50 k on denso plugs. Changed motor mounts with oem. Air Filter has about 10k on it, fuel filter at about 25k.

Why does my idler pulley squeal when I Turn on the engine?

Another common symptom of a possible issue with the idler pulley is squealing from the engine belts. If the surface of the idler pulley wears, or the pulley seizes or binds it may cause the engine belt to squeal as a result of it rubbing against the surface of the pulley.

What are the symptoms of an idler pulley problem?

One of the first symptoms of an issue with an idler pulley is visible wear on the pulley. Over time, as the pulley spins against the belt, both components will eventually start to wear. This may lead to visible scoring marks on the surface of the pulley, as a result of contact with the belt.

Can a car run without an idler pulley?

An engine without a belt can quickly run into issues such as overheating and stalling, as it’s the drive belt that allows the engine accessories to function. Idler pulleys are a common component found on the majority of road going vehicles that will eventually require replacement, especially in high mileage vehicles.

How big is the fuel filter on an envoy?

Pulled plugs, look fine. Have about 50 k on denso plugs. Changed motor mounts with oem. Air Filter has about 10k on it, fuel filter at about 25k. Not sure where to go from here, I don’t want to just throw parts at it.

Do you need an OEM Service Manual for envoy?

Only use AC mounts, the aftermarket is very hit or miss, biased to miss, on damping the 10 Hz frequency at idle. He did say he replaced the mounts with OEM. Need GMT360/370 Service Manuals?

Is the top end of the envoy OK?

Accelerates fine and top end is fine. Just a pronounced misfire at about 500 rpm. Cleaned TB, run BG44k through tank. Cleaned Camshaft actuator solenoid. Was clean even after 200k, first time I’ve pulled it. Pulled plugs, look fine. Have about 50 k on denso plugs. Changed motor mounts with oem.

What’s the problem with my GMC Envoy engine?

We have a 2003 GMC Envoy. Normally upon starting the car, the engine will rev high for a few mi… Before I call a local mechanic shop, I thought I would post my problem on here and get an idea of what might be the cause. We have a 2003 GMC Envoy.

What causes the Check Engine light to come on?

A failing ignition coil can create several symptoms: Check engine light comes on Engine runs poorly or stall Increased emissions Reduced fuel economy Car won’t start I… Read More When spark plugs fail, the engine will struggle. The check engine light will come on, and it may appear either solid or flashing.

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