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Jeep Comanche Engine ReplacementCompare Prices & Save

Get quotes today from trusted UK Jeep Comanche engine specialists. Compare prices on reconditioned, rebuilt and used engines - supply & fit available.

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Jeep Comanche 4.0L straight-six engine - ERH EPE rebuilt reconditioned UK
Jeep Comanche 4.0L Engines- from £850 to £3,200

Rebuilt units from £1,450

Common codes: ERH, EPE, HAM4.0T5LYX6, HAM4.0T5LAB9

Jeep Comanche 2.5L four-cylinder engine - EPE AMC2.5 rebuilt reconditioned UK
Jeep Comanche 2.5L Engines- from £650 to £2,100

Rebuilt units from £950

Common codes: EPE, AMC2.5, 2.5TBI

Jeep Comanche 2.8L V6 2.1L diesel engine - J8S-814 GM2.8V6 rebuilt reconditioned UK specialist
Jeep Comanche Rare Engine Units- from £1,200 to £4,500

Rebuilt units from £1,850

Common codes: J8S-814, GM2.8V6, LR2

Jeep Comanche engine replacement UK - compare reconditioned and rebuilt engine prices
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How It Works

3 Simple Stepsto Finding the Best Jeep Comanche Replacement Engine

12-Month Warranty
Supply & Fit Available
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Most replacements completed within 3-5 days.

Engine Intelligence

Jeep Comanche Engines - Codes, Common Failures & Replacement Costs

The cards below cover the main engines fitted to the Jeep Comanche in the UK, including documented failure causes, variant production years, and typical rebuilt engine costs based on current UK market data.

Jeep Comanche engine intelligence reference

ERH

Production History

  • 4.0L High Output (HO) - 1991-1992
  • 4.0L HO Renix crossover models - approx. 1990-1991

Known Failures

  • Lifter collapse - valvetrain noise and misfires common after 80k miles on high-mileage units.
  • Cylinder head cracking - 0331 casting prone to cracks between valves 3 and 4 under heat stress.
  • Rear main seal leak - oil seepage from bellhousing area, often requires engine removal to address.

Specs

Petrol · 4.0L · 173-193hp · Naturally Aspirated

Replacement Cost

Typical UK rebuilt engine: £1,450-£3,200 (supply only) Estimated from comparable 4.0L AMC units - actual quotes may vary.

EPE

Production History

  • 2.5L TBI Four-Cylinder - 1986-1990
  • Base model Comanche variants - 1986-1992

Known Failures

  • Crankshaft position sensor failure - no-start condition, intermittent stalling, common on Renix-era units.
  • Throttle body injection issues - rough idle, hesitation, fuel delivery problems after 70k miles.
  • Timing chain stretch - rattling noise on cold start, potential valve timing drift on neglected engines.

Specs

Petrol · 2.5L · 105-121hp · Naturally Aspirated

Replacement Cost

Typical UK rebuilt engine: £950-£2,100 (supply only) Estimated from comparable AMC 2.5L units - actual quotes may vary.

J8S-814

Production History

  • 2.1L Renault Turbo Diesel - 1986-1992 (European market imports only)
  • UK-imported LHD Comanche diesel variants - approx. 1987-1992

Known Failures

  • Injection pump wear - hard starting, loss of power, black smoke under load on high-mileage units.
  • Turbocharger failure - oil leaks, boost loss, whining noise common after 100k miles.
  • Head gasket failure - coolant/oil mixing, overheating, white exhaust smoke on neglected examples.

Specs

Diesel · 2.1L · 85-95hp · Turbocharged

Replacement Cost

Typical UK rebuilt engine: £1,850-£4,500 (supply only) Estimated from comparable Renault J8S units - actual quotes may vary due to rarity.

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Variants We Cover

Jeep Comanche Engine ReplacementAll Variants Covered

Not sure which variant your Jeep Comanche is- Enter your registration number above - we'll identify the exact sub-model, engine code and compatible replacement options instantly.

Engine Codes

Jeep Comanche Engine Codes

Every engine code fitted to the Jeep Comanche across all generations, with technical specs, compatible variants and trims, known failure points, and average rebuilt prices from UK specialists. Select any engine code to compare quotes.

Petrol Engines

Extracted from detailed petrol and performance engine families across Jeep Comanche variants.

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Common Problems

Jeep Comanche Engine Problems

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Save vs Main Dealer Price

Disclaimer: All prices are indicative UK market ranges based on historical quote data and repair requests from our network of engine specialists. Dealer pricing is estimated based on published main dealer labour rates and genuine OEM parts pricing. Specialist pricing reflects actual quote data from EngineMarket's UK network. Actual costs vary depending on damage severity, vehicle condition, variant, and workshop location within the UK. Use our free comparison tool to get tailored quotes for your specific Jeep Comanche and engine code. Every engine supplied through EngineMarket carries a minimum 12-month unlimited mileage warranty - always confirm exact terms with your chosen supplier.

Replacement Engine Options

Jeep Comanche Replacement Engine Types

Every Jeep Comanche engine type is available through our UK network with typical price ranges based on variant, engine code and budget.

Jeep Comanche Refurbished EnginesTargeted repairs addressing specific failures like CPS sensors or lifters without full teardown.
Typical Price
£850 - £2,100
(supply only)
View refurbished Jeep Comanche engine options
Refurbished

Refurbished engines focus on repairing documented failure points while retaining sound core components.

  • Suitable for engines with single known issues like CPS failure or minor oil leaks
  • Includes replacement of faulty sensors, gaskets and worn external components
  • Faster turnaround than full rebuild; 6-12 month warranty on repaired components
Typical Price
£850 - £2,100
(supply only)
View refurbished Jeep Comanche engine options

All rebuilt engines include a minimum 12-month warranty when sourced through EngineMarket. Prices are typical UK market ranges based on historical quote data from our network and depend on exact engine code, variant, mileage and supplier. Use our free comparison tool above - enter your registration to get tailored quotes for your specific Jeep Comanche within hours.

Engine Sizes

Jeep Comanche Engines by SizeFind the Right Displacement for Your Variant

Every displacement fitted to the Jeep Comanche is listed below, with compatible engine codes, production years and common failure notes to help you identify the correct replacement.

The 2.5L AMC four-cylinder powered base Comanche models from 1986-1992, valued for fuel economy but prone to Renix-era ignition sensor failures that often trigger replacement searches.

ENGINE CODE(S)EPE, AMC2.5, 2.5TBI
COMPATIBLE MODELS (UK)Base 2.5L, Pioneer 2.5L, Sport 2.5L
PRODUCTION YEARS1986-1992
Common Failure Points

Crankshaft position sensor no-start, TBI carbon buildup, timing chain stretch

Compare Jeep Comanche 2.5L petrol engine prices

Not sure which engine size your Jeep Comanche needs- Enter your registration number above - we'll identify the exact displacement, engine code and compatible replacement options instantly. All engines supplied through EngineMarket include a minimum 12-month unlimited mileage warranty from UK Jeep Comanche specialists.

Fuel Type

Jeep Comanche Engines by Fuel Type

Choose your Jeep Comanche engine by fuel type to compare realistic replacement prices, known issues, and compatible UK supply options - from the economical 2.5L petrol to the rare 2.1L diesel import.

Petrol engines dominated Comanche production, with the 4.0L straight-six accounting for most replacement enquiries due to its popularity and known failure patterns like lifter collapse and head cracking.

Common Jeep Comanche Petrol Engine Families
ERH
4.0L HO (1991-1992), most sought-after variant for performance restorations
HAM4.0T5LYX6
Renix 4.0L (1987-1990), known for CPS sensor and ignition module issues
EPE/AMC2.5
2.5L four-cylinder (1986-1992), budget option with TBI reliability concerns
GM2.8V6
Rare 1986-only V6, collector-focused with limited parts availability
Found In
First Generation MJ (1986-1992)
All petrol variants listed above
Known For
Robust AMC 4.0L architecture shared with XJ Cherokee for cross-compatibility
Renix-era ignition system sensitivity requiring specialist diagnostic knowledge
Cylinder head cracking on 0331 casting under sustained high-temperature operation
Strong DIY community support for maintenance and replacement guidance
Typical Petrol Models
Base 2.5L / 4.0LPioneer 2.5L / 4.0LSport 2.5L / 4.0L Renix / 4.0L HOLong Bed / Short Bed variants
Compare Jeep Comanche Petrol engine prices

Not sure which fuel type your Jeep Comanche has- Enter your registration number above to instantly identify your engine code, fuel system and compatible replacement options - all backed by a minimum 12-month unlimited mileage warranty from UK Jeep Comanche specialists.

Engine Years

Jeep Comanche Engines by YearWhat Was Fitted & When

This section covers all major engine changes across the Comanche's 1986-1992 production timeline, organised so owners can quickly identify their engine and compare rebuilt prices from UK specialists.

1986 - Launch Year: 2.5L Base & Rare 2.8L V6 Debut
Major Engine Changes2 engine highlights
The Comanche launched with two petrol options: the economical 2.5L four-cylinder and the one-year-only 2.8L GM V6, setting the foundation for MJ engine compatibility.
Key Changes
First production year for Jeep Comanche (MJ platform)
Introduction of 2.5L AMC four-cylinder and 2.8L GM V6 engine options
Shared architecture with XJ Cherokee established for parts interchangeability
Known For
2.8L V6 rare and sought by collectors restoring original-spec vehicles
Early Renix electronics on 2.5L prone to sensor-related no-start issues
Strong chassis and drivetrain foundation shared with XJ Cherokee
Main Engines
EPE/AMC2.5 - 2.5L petrol (Base, Pioneer variants)
GM2.8V6/LR2 - 2.8L V6 petrol (1986 only, all trims)
Engine Codes Covered
EPEAMC2.5GM2.8V6LR2
Popular Models
Jeep Comanche Base 2.5L
Jeep Comanche Pioneer 2.5L
Jeep Comanche Base 2.8L V6
Common Replacement Enquiries
1986 Comanche 2.8L V6 engine
2.5L Renix no-start fix
XJ donor engine compatibility
Get quotes for 1986 Jeep Comanche replacement engines
FAQ

Jeep Comanche Engine ReplacementFrequently Asked Questions

Will a Jeep Cherokee engine fit a Comanche-

Yes, the Comanche shares its engine architecture with the XJ Cherokee (1984-2001), making most 4.0L and 2.5L engines directly compatible with proper mounting hardware and ECU matching.

  • 4.0L straight-six engines are fully interchangeable between Comanche and XJ Cherokee
  • Verify engine code (ERH, EPE, Renix) matches your Comanche year and electronics
  • Mounting points, transmission bellhousing and accessory brackets align across platforms
  • ECU and wiring harness may require adaptation for Renix vs HO variants
Compare XJ-compatible 4.0L engine prices for your Jeep Comanche

How much does it cost to replace a Jeep Comanche engine in the UK-

Typical rebuilt engine costs range from £950 for a 2.5L four-cylinder to £3,200 for a 4.0L High Output, with supply-only pricing; fitting labour adds £450-£850 if using a specialist.

  • 2.5L rebuilt engines: £950-£2,100 supply only
  • 4.0L Renix rebuilt: £1,200-£2,800; HO variant: £1,450-£3,200
  • Rare engines (2.8L V6, 2.1L diesel): £1,800-£4,500 due to scarcity
  • All EngineMarket suppliers include minimum 12-month unlimited mileage warranty
Get a tailored Jeep Comanche engine replacement quote today

What is the difference between Renix and High Output 4.0L engines-

Renix (1987-1990) uses throttle-body injection with 173hp; High Output (1991-1992) features improved cylinder head, cam profile and 193hp output with updated engine management.

  • Renix: 173hp, throttle-body injection, prone to CPS and ignition module failures
  • HO: 193hp, multi-port injection, improved 0630/7120 cylinder head casting
  • ECU, wiring harness and intake manifold differ between the two systems
  • HO engines command higher replacement value due to performance and rarity
Compare Renix vs HO 4.0L engine prices for your Comanche

Is the Jeep Comanche 4.0L engine reliable-

The 4.0L AMC straight-six is fundamentally robust, but age-related failures like lifter collapse, cylinder head cracking and CPS sensor issues drive replacement demand on high-mileage examples.

  • Bottom end is exceptionally durable; failures typically stem from ancillary components
  • Regular cooling system maintenance prevents head gasket and cracking issues
  • Upgraded lifters and improved head castings in rebuilt units address known weaknesses
  • Strong DIY community and parts availability support long-term ownership
Find a rebuilt 4.0L Comanche engine with upgraded components

What causes the Jeep Comanche no-start issue on Renix models-

Crankshaft position sensor failure is the most common cause, interrupting the spark signal; ignition module overheating and wiring harness degradation are secondary culprits.

  • CPS sensor located on bellhousing; fails due to heat and vibration over time
  • Symptoms: engine cranks but no spark, intermittent stalling while driving
  • Replacement sensor costs £40-£80; labour 1-2 hours for DIY-capable owners
  • Upgraded ignition components in rebuilt engines reduce recurrence risk
Get quotes for Renix ignition-repaired Comanche engine replacement

Is it worth replacing the engine on a classic Comanche-

For restorable Comanches valued £3,000-£8,000, a rebuilt engine often makes financial sense versus parting out, especially when using XJ Cherokee donor compatibility to control costs.

  • Comanche values rising among classic truck enthusiasts and off-road collectors
  • Rebuilt 4.0L engines (£1,450-£3,200) preserve vehicle value and usability
  • XJ Cherokee donor engines offer cost-effective replacement with proven compatibility
  • EngineMarket warranty protection reduces long-term ownership risk
Compare rebuilt engine prices to decide on your Comanche restoration

What engines are compatible with the Comanche MJ for swaps-

Beyond direct 4.0L/2.5L replacements, popular swap options include the 4.0L HO upgrade, 5.2L/5.9L V8 (with adapter kits), and modern LS conversions for performance builds.

  • 4.0L HO is a bolt-in upgrade for Renix Comanches with ECU adaptation
  • V8 swaps require transmission, crossmember and wiring modifications
  • LS conversions offer modern reliability but need significant fabrication
  • Always verify emissions and MOT compliance for modified engines in the UK
Enquire about performance engine options for your Jeep Comanche

How long does a Comanche engine replacement take for DIY owners-

Experienced DIY mechanics typically complete a Comanche engine swap in 2-4 days with proper tools; supply-only engines allow flexible scheduling without specialist booking delays.

  • Comanche's body-on-frame design simplifies engine removal vs unibody vehicles
  • Allow extra time for Renix wiring harness adaptation or HO conversion steps
  • EngineMarket suppliers can coordinate delivery timing to match your project schedule
  • Post-installation tuning and break-in procedures critical for longevity
Find supply-only Jeep Comanche engines for your DIY project

What warranty coverage comes with replacement Comanche engines-

All engines supplied through EngineMarket include a minimum 12-month unlimited mileage warranty covering parts and labour for manufacturing defects, with upgrade options available.

  • Warranty covers rebuilt, reconditioned and remanufactured units from vetted UK specialists
  • Supply & fit installations include labour coverage; supply-only covers engine components
  • Keep service records and use recommended break-in procedures to maintain coverage
  • Confirm exact terms with your chosen supplier before order confirmation
Compare warranty terms across Jeep Comanche engine suppliers

Can I upgrade from a Renix 4.0L to a High Output engine in my Comanche-

Yes, the HO 4.0L is a popular upgrade for Renix Comanches, requiring ECU, wiring harness and intake manifold changes but delivering 20hp gain and improved reliability.

  • HO cylinder head and cam profile bolt directly to Renix block with adapter gaskets
  • Source complete HO donor engine with matching ECU and harness for simplified swap
  • Tuning may be needed to optimise performance after conversion
  • Upgraded components in rebuilt HO units address known Renix-era weaknesses
Get quotes for HO upgrade engine packages for your Jeep Comanche

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Why UK Jeep Comanche Owners Trust EngineMarket

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UK Engine Replacement Services for Jeep Comanche

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