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Erratic Speedometer, Rough Idle, Hesitation Upon Acceleration

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Old 28 Jun 2016, 05:00 am
Fresh Cruiser
Join Date: Aug 2008
Location: Georgia
Posts: 27
Default Erratic Speedometer, Rough Idle, Hesitation Upon Acceleration

When in park or with foot on brake, my speedometer will jump from 0-100, then it stop and appear to be fine. I notice this happens when I cut on the AC or increase the fan. When first apply gas pedal the car sputters or hesitates like it's going to cut off.

While idling at light, the car shutters like it's going to cut off, the speedometer starts jumping again. Sometimes, the engine sounds like it revs up. It seems like a loss of power is occurring somewhere. The PCM/TCM is new and recently programmed. They've stated the battery is fine, but something has drained the battery at times and it has needed to be recharged. Mechanics state they don't know what's going on.

I've heard the ignition switch or diode, could be the problem. Can anyone help me out here?


Last edited by TheFox; 28 Jun 2016 at 05:06 am.
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Old 28 Jun 2016, 09:42 am
Obsessed Cruiser
Join Date: Aug 2014
Location: Thousand Oaks, CA
Posts: 7,461
Default Re: Erratic Speedometer, Rough Idle, Hesitation Upon Acceleration

I am suggesting you might have an electrical short that might be hard to find.
First I would suggest you have a battery load test done. You need to know if your charging system is working properly. When the operating battery voltage drops it can confuse the sensors and give you false readings Make sure the battery is in the PT Cruiser and the battery load tester is set up for the battery amperage the battery is suppose to hold. If you have a battery charger fully charge the battery before taking it in for the test. Post what you find.
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