Enhancing a vehicle’s engine can be a thrilling experience. However, as recent diagnostics on a Jeep Grand Cherokee SRT reveal, modifying your HEMI engine without due care can sometimes lead to unforeseen complications and significant damage. This article breaks down a recent case involving a misfire diagnosis that uncovered severe engine issues, highlighting the importance of understanding both the benefits and risks associated with engine upgrades.
A customer brought in their Jeep Grand Cherokee SRT, equipped with the powerful 6.4 litre HEMI engine, due to concerns about a misfire on cylinder 7. Misfires in HEMI engines are fairly common, typically attributed to worn cam lobes or lifter failures exacerbated by the Multi Displacement System (MDS).
Symptoms of a Misfire:
- Rough idle
- Decreased engine performance
- Increased fuel consumption
- Potential engine damage over time
The owner had previously replaced the spark plugs but continued to experience issues, which led to further investigation by the dealership’s technicians.
Unexpected Findings
An initial inspection revealed that the spark plugs presented significant impact damage, hinting at an underlying issue that was not simply cosmetic. Using a diagnostic camera to look inside the cylinder, technicians discovered extensive damage to the cylinder head and piston. Here’s a breakdown of the findings:
- Impact Damage Visible: The internal examination showed chunks of piston missing and fragments possibly lodged in the head.
- Piston Analysis: A portion of the piston was broken, raising concerns about the structural integrity of the engine. Piston rings could also be seen, which indicated severe wear and tear.
This observational data became crucial for understanding the reasons behind the failure. The cause? An aggressive tuning setup combined with a Stage 2 cam upgrade. This estimate suggested that while performance enhancements can yield impressive power gains, they could also place undue stress on engine components when not tuned correctly, particularly in a vehicle as heavy as the Jeep SRT. When chasing more power when going with a stage 2 camshaft it’s recommended to install forged pistons and rods for durability.
Advantages of a Stage 2 Camshaft:
- Increased Horsepower: Enhanced air intake and exhaust flow boost engine output.
- Improved Torque: Allows for better acceleration and responsiveness at higher RPMs.
- Better Engine Sound: The result often includes a more aggressive exhaust note, appealing to performance enthusiasts.
- MDS Delete for engine longevity
In the case of this Jeep Grand Cherokee SRT, technicians determined that instead of merely replacing the camshaft or repairing the cylinder head, a whole new engine might be necessary due to the extent of the damage to the piston in cylinder 7.
Lessons Learned:
- Perform thorough diagnostics before making modifications.
- Understand the balance between performance gains and potential risks to engine health.
- Always consult with experienced tuner or engine builder before proceeding with major upgrades and tuning.
If you’re considering upgrades to your existing vehicle or are simply curious about automotive enhancement opportunities, consult us on 9987 2818 and we can provide insights tailored to your vehicle. This approach can help ensure that you manage both performance aspirations and the integrity of your engine.
Whether you’re focusing on daily driving or looking to unleash your vehicle’s full potential, let’s ensure that your automotive journey remains about enhancing performance safely and effectively.
