1. Exhaust & Emission Parts To Buy
  2. sku: 20184295752140711
  3. GM 070207

GM 070207 Pcv Valve Tube Emissions Hose L6 256 4.2L

fits model: Envoy, Trailblazer. year: 2002–2009.

070207 Gm 02-09 Envoy Trailblazer L6 256 4.2l Pcv Valve Tube Emissions Hose Oem

( Brand: Gm ), ( Manufacturer Part Number: 070207 ), ( Part Type: Valve Tube Hose )

Review GM L6 256 4.2l Pcv Valve Tube Emissions Hose Oem fits ENVOY TRAILBLAZER 2002–2009

The **GM 070207 02-09 Envoy Trailblazer L6 256 PCV Valve Tube Emissions Hose** is a precision-engineered component designed specifically for General Motors 2002 through 2009 model-year **L6 4.2L V8** engines found in vehicles like the **GMC Envoy, Chevrolet Trailblazer, and Saab 9-7X**. This emissions hose plays a critical role in maintaining optimal engine performance and compliance with federal and state emissions regulations by facilitating proper airflow within the Positive Crankcase Ventilation (PCV) system. Crafted from high-quality, heat-resistant rubber and reinforced with durable synthetic fibers, this hose is engineered to withstand the harsh conditions of underhood environments, including exposure to engine heat, oil vapors, and road debris. Its seamless construction ensures a tight, leak-free seal, preventing harmful crankcase gases from escaping into the atmosphere while allowing them to be safely recirculated back into the intake system for combustion. The hose s precise fitment is tailored to the unique intake manifold and PCV valve connections on the L6 engine block, ensuring a secure and reliable connection that minimizes the risk of air leaks, which can lead to reduced fuel efficiency, increased emissions, and potential engine damage over time. Whether replacing a worn-out original equipment hose or upgrading for improved durability, this aftermarket part offers a direct replacement solution that meets or exceeds OEM specifications, providing long-lasting performance and peace of mind for mechanics and DIY enthusiasts alike.

### **Pros and Cons of Buying a GM 2007-2009 Envoy Trailblazer (L6 4.2L) with the Specified Emissions Components**

#### **Overview**

This vehicle is a **2007-2009 General Motors Envoy Trailblazer** (based on the GMC Envoy platform) with a **4.2L L6 Vortec engine**, equipped with a **PCV valve tube, emissions hose, and a 256-series catalytic converter**. These components are critical for emissions compliance and engine health, but their condition can significantly impact reliability and cost.

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### **Pros**

1. **Proven Engine (4.2L L6 Vortec)**

- The **4.2L V6** is a robust, durable engine known for longevity, especially in older GM trucks and SUVs. With proper maintenance, it can easily exceed **200,000 miles**.

- **Good fuel economy** for its class ( 15-18 MPG combined), better than many V8 alternatives.

- **Strong towing capacity** (up to **5,000 lbs** with proper setup), making it suitable for light-duty hauling.

2. **Reliable Transmission (4L60-E Automatic)**

- The **4L60-E 4-speed automatic** is a well-regarded transmission with a reputation for durability if maintained.

- Smooth shifting when properly serviced (fluid changes every **30K-50K miles**).

3. **Full-Size SUV Platform (Envoy/Trailblazer)**

- **Spacious interior** with room for passengers and cargo, making it practical for families or light work.

- **High ground clearance** (better than many compact SUVs) for off-road capability.

- **Available AWD** (if equipped), which improves traction in snow or rough terrain.

4. **Potential for Modifications & Upgrades**

- The **4.2L engine** supports **performance upgrades** (intake, exhaust, ECU tuning) without major overhauls.

- **Aftermarket parts** (suspension, wheels, lighting) are widely available.

- **Cheap to maintain** compared to modern vehicles, with affordable labor and parts.

5. **Good Resale Value for a Used SUV**

- While not a luxury vehicle, the **Envoy/Trailblazer holds value reasonably well** compared to similar-aged SUVs.

- **Lower insurance costs** than newer or luxury SUVs.

6. **Emissions Components (If in Good Condition)**

- The **PCV valve, emissions hose, and catalytic converter** (256-series) are standard for **2007-2009 models** and help pass emissions tests.

- If these components are **new or recently replaced**, they reduce the risk of **failing smog checks** or **engine damage** from poor emissions flow.

---

### **Cons**

1. **Emissions System Reliability Issues**

- **PCV Valve Failures** The **PCV valve** can clog or fail, leading to **rough idling, vacuum leaks, or check engine lights (P0171/P0174)**. Replacement is **cheap ( $20-$50)**, but neglect can cause **carbon buildup in the intake**.

- **Emissions Hose Wear** The **emissions hose** can crack or leak over time, causing **failing smog tests** or **engine misfires**. Replacement costs ** $50-$150**.

- **Catalytic Converter Failure Risk** The **256-series catalytic converter** can fail due to **heat damage, exhaust leaks, or rich fuel mixtures**, leading to **poor performance and check engine lights (P0420, P0430)**. Replacement is **expensive ( $500-$1,200 installed)**.

- **Smog Test Failures** Many **2007-2009 GM vehicles** struggle with **California smog checks** due to **aging emissions components**. Even if the engine is fine, the **PCV, hoses, or O2 sensors** may need replacement.

2. **Common Engine & Drivetrain Problems**

- **Rod Knock & Engine Wear** The **4.2L V6** is prone to **rod knock** (especially after **150K miles**) due to **oil leaks, poor maintenance, or low oil pressure**. A **rod knock** can lead to **catastrophic engine failure** if ignored.

- **Symptoms:** Knocking noise under acceleration, **blue smoke from exhaust**, **oil leaks** (valve cover, oil pan gasket).

- **Fix:** **Engine rebuild ( $3,000-$5,000)** or **replacement ( $4,000-$6,000)**.

- **Transmission Issues** Some **4L60-E transmissions** develop **slipping, rough shifting, or delayed engagement**, often due to **low transmission fluid or worn clutches**.

- **Symptoms:** **Harsh shifts, delayed acceleration, transmission fluid leaks**.

- **Fix:** **Fluid change ( $100-$200)** or **transmission rebuild ( $1,500-$3,000)**.

- **Water Pump & Timing Chain Failure** The **timing chain** can stretch or break, leading to **engine damage**. The **water pump** often fails at the same time, requiring a **timing set replacement ( $800-$1,500)**.

- **Symptoms:** **Ticking noise from the timing cover, overheating, coolant leaks**.

- **Prevention:** **Replace the water pump and timing chain at 100K miles** (if not done already).

3. **Suspension & Steering Wear**

- **Worn Bushings & Struts** The **front and rear suspension** (control arms, bushings, struts) often wear out by **100K-150K miles**, leading to **rough rides, clunking noises, and poor handling**.

- **Power Steering Failure** The **hydraulic power steering** can fail, making steering **difficult and effortful**.

- **Fix:** **Power steering pump replacement ( $300-$600)**.

4. **Electrical & Interior Issues**

- **Faulty Window Regulators** Power windows often **stick or fail**, requiring **replacement ( $100-$300 per window)**.

- **Infotainment & Climate Control Problems** The **radio, climate controls, and seat heaters** can fail due to **aging wiring or relays**.

- **Rust & Body Damage** Many **older GM SUVs** suffer from **underbody rust**, especially in **snow-belt states**. Check for **frame rust, wheel wells, and floor pans**.

5. **Fuel Economy & Modern Comparisons**

- **Poor MPG compared to modern SUVs** ( 15-18 MPG combined), making it **more expensive to operate** than a **modern hybrid or turbocharged SUV**.

- **No modern safety features** (no **ESC, multiple airbags, or advanced driver aids**), which can be a concern in **accident-prone situations**.

6. **Emissions Compliance Challenges**

- **Difficulty Passing Smog Tests** Even with **new emissions parts**, some **2007-2009 GM vehicles** fail due to **O2 sensor issues, vacuum leaks, or failing catalytic converters**.

- **Potential for "No Smog" States** If buying in a **non-smog state**, this is less of an issue, but **California and some other states require annual testing**.

---

### **Key Considerations Before Buying**

1. **Engine Condition (Most Critical Factor)**

- **Listen for rod knock** (accelerate from a stop if you hear a **metallic tapping**, it s bad).

- **Check oil pressure** (low oil pressure risk of engine failure).

- **Look for oil leaks** (valve cover, oil pan, rear main seal).

- **Get a pre-purchase inspection (PPI)** ( $100-$200) to check for **rod knock, compression, and emissions issues**.

2. **Transmission & Drivetrain**

- **Test drive for smooth shifting** no **slipping, hesitation, or rough engagement**.

- **Check transmission fluid** should be **red and clean** (not burnt or low).

3. **Emissions System Health**

- **Test drive for rough idling, vacuum leaks, or check engine lights**.

- **Inspect PCV valve, hoses, and catalytic converter** for **cracks, leaks, or excessive heat damage**.

- **Check O2 sensor codes** (P0171, P0174, P0420) with an **OBD-II scanner**.

4. **Maintenance History**

- **Oil changes every 3K-5K miles** (critical for engine longevity).

- **Transmission fluid changes every 30K-50K miles**.

- **Timing chain/water

Details:

02-09 Envoy Trailblazer L6 256 4.2L PCV Valve Tube Emissions Hose this is the hose that goes into valve cover shipped USPS This.

specifications emissyste:

  • for models: Envoy, Trailblazer
  • for years: 2002-2009
  • brand: Gm
  • mpn: 070207
  • part type: Valve Tube Hose

shipping emissyste:

  • cost: $0.00
  • type: Calculated
  • class: Standard
  • service: USPS Ground Advantage
  • transit: 4-10 Days
  • carrier: USPS

offer emissyste:

  • quantity: 1
  • options: Ship-to-home
  • availability: In Stock
  • sold: 0
  • started: February 16, 2026

returns emissyste:

  • policy: Returns Accepted
  • time: 30 Days
  • paid by: Seller

general emissyste:

  • condition: Used
  • Car Truck Parts Accessories > Exhaust Emission Systems > Other Exhaust Emission Parts

seller emissyste:

  • city: Taylor, Pennsylvania
  • rating: 99.3%
  • # reviews: 833

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for models: envoy, trailblazer, for years: 2002-2009, part type: valve tube hose,
category: auto parts > car truck parts accessories > exhaust emission systems > exhaust emission parts, sku: 20184295752140711,
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