My Jeep starts, runs, revs fine clear up to the redline while parked in my driveway.

1923FORD

MEMBER
2004 JEEP WRANGLER
6 CYL
4WD
MANUAL
120,000 MILES

My jeep starts, runs, revs fine clear up to the redline while parked in my drive way.

on the street, it will rev fine in first gear ONLY, but 2nd-5th gear, it will not rev past 3000rpm. Even while rolling, if I simply push in the clutch, and put the gas pedal to the floor, it will NOT rev past 3000rpm.

it is not throwing any OBD codes, i've replaced the TPS (2times), fuel pump, spark plugs, spark plug boots, new radiator.

HELP!

1 Reply

CJ MEDEVAC

MECHANIC
11,004 POSTS

Based on the symptoms you described, there could be a few potential causes for your 2004 Jeep Wrangler's issue with not revving past 3000rpm in gears 2nd to 5th. Here are a few possibilities to consider:

Restricted Exhaust: A partially blocked or restricted exhaust system can cause a lack of power and limited RPM range. This can be due to a clogged catalytic converter, a restricted muffler, or a damaged exhaust pipe. A thorough inspection of the exhaust system is recommended.

Fuel Delivery Issues: Even though you mentioned replacing the fuel pump, there may still be a problem with the fuel delivery system. It's worth checking the fuel pressure to ensure it meets the manufacturer's specifications. Additionally, a clogged fuel filter or a faulty fuel pressure regulator could cause inadequate fuel supply to the engine.

Ignition System: While you mentioned replacing the spark plugs and spark plug boots, it's essential to ensure they are the correct type and properly gapped. Additionally, check the condition of the ignition coils and the ignition control module.

Throttle Body and Intake System: The throttle body may need cleaning or adjustment, especially if it's experiencing issues with the throttle position sensor (TPS). Check for any carbon buildup or debris in the throttle body and clean it if necessary. Also, inspect the intake system for any leaks or restrictions.

Transmission Issues: It's possible that there may be a problem with the transmission, such as a slipping clutch or a malfunctioning sensor. A professional transmission inspection or scan may be required to diagnose any specific issues.