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Chrysler Lhs Fuel Injection Plenum Gaskets

Chrysler Lhs Fuel injection plenum gaskets

Starting at $50.95, AutoBuffy stocks 1 fuel injection plenum gaskets from Standard Ignition. This gasket seals the plenum chamber to the intake manifold, keeping the air-fuel mixture properly pressurized. When it fails, unmetered air enters the intake tract, causing rough idle, misfires, and potential engine damage from a lean-running condition.

Signs your Chrysler Lhs needs a new fuel injection plenum gasket

  • Rough or unstable idle that worsens when the engine reaches operating temperature
  • Noticeable hissing or sucking sound from the intake area at idle or light throttle
  • Check Engine light with lean mixture codes (e.g., P0171 or P0174) stored in the ECU
  • Hesitation or stumbling during acceleration, especially from a stop
  • Fuel trims running persistently high as the ECU tries to compensate for unmetered air
  • Visible cracking, hardening, or oil residue around the plenum-to-manifold sealing surface

Which fuel injection plenum gasket should you buy for your Chrysler Lhs?

The main decision is material and construction quality. OE-equivalent gaskets restore factory sealing performance, while upgraded multi-layer or reinforced versions can outlast the original, especially on higher-mileage engines where manifold surfaces may be slightly uneven. Confirm the gasket matches your specific engine's plenum bolt pattern and port configuration before ordering.

OE-Replacement (rubber/composite)
Best for
Daily drivers, stock engines, budget-conscious repairs
What you get
Factory-spec material and dimensions; straightforward drop-in fit with no surface prep beyond cleaning
Multi-Layer Steel (MLS)
Best for
High-mileage engines with minor surface irregularities or occasional overheating history
What you get
Superior crush resistance and leak recovery; conforms better to warped or pitted sealing surfaces
Reinforced Silicone-Coated
Best for
Engines in humid or high-heat climates, or with a history of coolant intrusion near the plenum
What you get
Enhanced chemical resistance to fuel vapors and coolant; extended service life over standard rubber composites
Full Gasket Set (plenum + related seals)
Best for
Complete intake service or engine rebuilds where adjacent seals are also aged
What you get
All plenum-area seals replaced at once; saves labor cost if other gaskets are due and prevents repeat teardowns

Fuel injection plenum gaskets brands we stock for your Chrysler Lhs

Standard Ignition
1 option · from $50.95

Replacing the fuel injection plenum gasket on a Chrysler Lhs

Moderate⏱ 1.5–3 hoursSocket and ratchet set (metric and standard)Torque wrenchGasket scraper or plastic razor bladeThrottle body or carburetor cleaner sprayManufacturer service manual or reliable torque sequence reference

Begin by relieving fuel system pressure and disconnecting the intake air duct and any vacuum, electrical, or coolant lines attached to the plenum before unbolting it in the correct sequence to prevent warping. Thoroughly clean both mating surfaces of all old gasket material before setting the new gasket in place without sealant unless the manufacturer specifically calls for it. Reinstall the plenum bolts and tighten in a crisscross pattern to the recommended torque range, then start the engine and check for vacuum leaks before returning the vehicle to service.

Frequently asked questions

How much does it cost to replace fuel injection plenum gaskets on a Chrysler Lhs?
The gasket itself starts at $50.95 at AutoBuffy. Total repair cost depends on labor rates in your area and how accessible the plenum is on your specific engine. DIY-friendly setups keep costs close to the part price alone, while shop labor can add one to three hours of billed time on top of the part.
Can I drive my Chrysler Lhs with a leaking fuel injection plenum gasket?
You should not drive long distances with a confirmed plenum gasket leak. The unmetered air entering the intake causes the engine to run lean, which increases combustion temperatures and can damage pistons, valves, and the catalytic converter over time. Short trips to a shop are acceptable, but extended driving risks escalating the repair cost significantly.
How long does a fuel injection plenum gasket last on a Chrysler Lhs?
Most plenum gaskets last many years under normal conditions, but heat cycling, coolant exposure, and fuel vapor contact degrade the material over time. High-mileage engines, vehicles driven in extreme heat, or those with a history of overheating tend to see failures sooner. Inspecting the gasket during any major intake service is a good habit.
Will a bad plenum gasket cause my Chrysler Lhs to fail an emissions test?
Yes, it can. A leaking plenum gasket introduces unmetered air, pushing the air-fuel ratio lean and triggering lean mixture fault codes. These codes illuminate the Check Engine light, which is an automatic failure in most OBD-II emissions inspections. Replacing the gasket and clearing the codes resolves the underlying cause before a retest.
Do I need to resurface the plenum or manifold when replacing the gasket on a Chrysler Lhs?
Not always, but it is worth inspecting both sealing surfaces before installation. If you find warping, deep grooves, or pitting, light resurfacing or lapping with a fine abrasive on a flat surface can improve the seal. Skipping this step on a damaged surface is a common reason a new gasket leaks shortly after installation.
What is the difference between a plenum gasket and an intake manifold gasket on a Chrysler Lhs?
The plenum gasket seals the upper plenum chamber — the pressurized air distribution box — to the lower intake manifold. The intake manifold gasket seals the manifold runners to the cylinder head ports. They are separate components, though both can fail with similar symptoms. Confirming which gasket is leaking before ordering prevents an unnecessary parts replacement.

Shop fuel injection plenum gaskets by year for the Chrysler Lhs

200120001999

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