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Roger Cordell

Roger ... 2/10/2019

2007 Chrysler PT Cruiser Base 4 Cyl 2.40L

Engine

Will not rev beyond 3,500 rpm,

Why does car not rev beyond 3,500 rpm ? Acts as tho a rev-limiter is the cause, but, I've disconnect the Throttle Position Sensor and still runs the same. It would not cold start without a long cranking period while holding gas pedal half way down. I disconnected the vaccume to throttle body which allows engine to cold start without touching throttle. Still runs the same, rough idle, sometimes lightly backfiring, as when driving, before the automatic gets ready to shift and hits 3,500 rpms the engine shuts down to whr u have yo ley off gas pedal to allow it to shift and every gear you have to let off again at 3,500 rpm. The engine itself, runs same as discribed. How can i correct this?

1 Answer


Jimm

Jimm 2/10/2019

First step - have the stored fault codes or check engine light scanned - for free - at any local auto parts store; Advance Auto, Auto Zone, NAPA.
Then, post a reply as 'add answer' with the specific code for more assistance.

This aspect is important; there may be a fault code stored in the OBD memory which may not be displayed as a check engine light.

Do not skip this important first step - there are literally hundreds of possible fault codes. Avoid wasting/ throwing money at the problem.

In neutral, the rev limiter will not allow the engine to rev past 4000 RPM.

If it is doing it while driving in gear, I would be focusing on the ignition system. Coil, plug wires and spark plugs.

Try these online resources; www.autopartswarehouse.com, www.rockauto.com, www.partsgeek.com - to list only a few.

In fact, they (RockAuto) list the replacement spark plugs from around $1.85 each, the ignition coil pack from around $17.50 each for your vehicle.

Spark plug = NGK #5017 - or it's equivalent
Ignition coil pack = STANDARD MOTOR PRODUCTS part #UF403T - or it's equivalent

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