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I have a fault on my GC 5.7 (2006) when I slightly rev the

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engine and take foot of...
I have a fault on my GC 5.7 (2006) when I slightly rev the engine and take foot of throttle it carries on increasing revs for a few seconds maybe another(###) ###-####pm then drops back.
Submitted: 1 year ago.Category: UK Car
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Customer reply replied 1 year ago
Happens at all revs. Did find the air temperature sensor in the chamber between the air filter and throttle body had fallen out and hanging down. All back in, didn't make any difference. Only does this with a hot engine.
Answered in 3 hours by:
12/22/2015
UK Auto Mechanic: Chris,
 replied 1 year ago
Chris
Category: UK Car
Satisfied Customers: 13,986
Experience: dasdasd
Verified

Hello and welcome to just answer. This is either a failing throttle body or the APPS (pedal position sensor). Do you have access to a scan tool that will read real time sensor data? If so, then we can determine if it is the APPS or the throttle body. Let me know if you have or can get/rent one.

Chris

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Customer reply replied 1 year ago
I have a scanner with real time, APPS ? is that the TPS ?
UK Auto Mechanic: Chris,
 replied 1 year ago

The TPS is the throttle position sensor inside of the throttle body. The APPS is the sensor on the gas pedal. When you step on the gas pedal, that sensor tells the PCM (engine computer) where you have the gas pedal. Then the PCM sends a signal to the motor in the throttle body which moves the throttle plate. Then the TPS monitors the position of the throttle plate and sends that iinfo back to the PCM. Based on your symtom, it is probably the APPS, but watch that voltage signal while stepping and releasing the pedal. If it follows your fott movement exactly with no lagging, then the APPS is good. I hope that makes sense,

Chris

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Customer reply replied 1 year ago
Yep very. Just looking in the Jeep manual, ok will check that first, was thinking of the motor that drives the throttle ?
UK Auto Mechanic: Chris,
 replied 1 year ago

Could be the throttle body motor, if so replace the complete throttle body.

Chris

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Customer reply replied 1 year ago
My scanner dosent list the APPS only the TPS, also because it has this problem with the engine hot and been used for 30 minutes or so its difficult to check. I was thinking if I take it out for a run so it shows the problem. Take the airfilter etc off and watch the throttle open and close to see if it continues after the accelerator is released ? The output from the APPS, is there somewhere on the throttle body I can measure the resistance ?
UK Auto Mechanic: Chris,
 replied 1 year ago

That sounds like a good plan. If it only happens when hot, then it is probably the throttle body.

Chris

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Customer reply replied 1 year ago
Will check and rank then. No point in nagging as its Xmas ! As soon as I've chech it out I'll give feedback.
UK Auto Mechanic: Chris,
 replied 1 year ago

Sounds good my friend! Merry Christmas to you and your family!!

Chris

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Customer reply replied 1 year ago
Hi Chris, me again. Changed throttle body for a new one. no change or may actually be worse! Also cruise control not working.
UK Auto Mechanic: Chris,
 replied 1 year ago

Hmmmm, you may need to have a shop perform a throttle body relearn procedure on the new throttle body. That will require a scan tool that will force the PCM to learn the voltage values of the new throttle body.

Chris

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Customer reply replied 1 year ago
will that have caused the cruise control issue ? The light comes on but doesn't engage.
Customer reply replied 1 year ago
What about a PCM reset somehow ? Battery off over night seems to be a general view ?
UK Auto Mechanic: Chris,
 replied 1 year ago

Yes. If the PCM does not know the voltage limits/values of the new throttle body, then it cannot set the cruise control requested speed. A PCM reset may or may not help. Try it first though.

Chris

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Customer reply replied 1 year ago
Hi again, do you have the part number for the APPS ? Or the accelerator package as it look like you have to buy the pedal assembly with the APPS. Cant find it in my parts catalogue. In the official service manual its under Fuel Injection 14-30.
Regards
UK Auto Mechanic: Chris,
 replied 1 year ago

Yes I can find it. And it is part of the pedal assembly. I will look it up and get back to you.

Chris

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UK Auto Mechanic: Chris,
 replied 1 year ago

Please send me the Jeep's VIN number so I can look up the correct APPS part number.

Chris

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Customer reply replied 1 year ago
Hi Chris
1J8HDE8255Y586299
Should be a right hand drive 2006 Grand Cherokee Ltd 5.7
Thanks
UK Auto Mechanic: Chris,
 replied 1 year ago

Ok, thanks. Based on your VIN number the part number is ***** That is for a Grand Cherokee 5.7 with non adjustable pedals.

I hope this helps, and if I have been helpful, would you kindly take a moment to rate my service today?

Thanks,

Chris

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Customer reply replied 1 year ago
Ive been offered a 52109685ac, is that similar?
UK Auto Mechanic: Chris,
 replied 1 year ago

Let me check.

Chris

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UK Auto Mechanic: Chris,
 replied 1 year ago

Ok, yes that part number will work, it has been superceded from the one I gave you.

Cheers,

Chris

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