Mechanics

WITH 318 ENGINE GOING DOWN THE ROAD AND EVEN IDLE RUNS RUFF. GOING DOWN THE ROAD IT ACT LIKE I LET OFF THE GAS WHEN I PRESS GAS FUTHER IT SEEMS TO SMOOTH OUT... NO CODE... I AM THINKING THE THROTTLE POSITION SENSOR. IT ACTS UP EVERY T

1995 Jeep Grand Cherokee • 150,000 miles

The jeep has a 318 engine. At times driving down the road the jeep acts like I let off the gas if I push the petal futher it picks up. Even at idle it runs ruff at times. No code when scanned. I have notice black sut on the ground at the exhaust sometimes. Could it be the tps going bad or what could cause this.

Thanks for your help. I will donate if you can help. And use your services because I own a auto repair shop. Getting into engine sensor repair. I fix auto AC for a living.
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Redmroadster
December 27, 2011.



http://www.2carpros.com/articles/engine-hesitates

Could be caused by one of the following below

Oxygen sensor.

Catalytic converter.

Fuel injectors dirty/sticking.

Mass airflow sensor/Airflow meter.

Throttle position sensor.

Crankshaft position sensor

Knock sensor

Manifold absolute pressure sensor.

EGR Valve

Fuel pressure regulator leaking or defective fuel pump.

Fuel contamination.

Foul/defective spark plugs.

Open spark plug wires.

Ignition coil/Coil packs defective.

Incorrect ignition timing.

Cap and rotor.

Note:If it doesn't apply disregard it and keep testing.

Rasmataz
Dec 27, 2011.