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I have a 1999 Dodge 2500 Diesel. Intermittently when I come

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to a stop it idles...
I have a 1999 Dodge 2500 Diesel. Intermittently when I come to a stop it idles down to normal idle speed then it will up surge approx. 200 rpm for a few seconds then down to normal rpm. The next time I come to a stop it will idle down and remain constant. As I said it is very intermittent - several stops no problem then maybe one up surge then several good then maybe 2 or three up surges. REALLY annoying.
All fuel lines, lift pumps checked - all okay. Fuel filter replaced.
Whats up?
Submitted: 1 year ago.Category: Dodge
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Answered in 5 minutes by:
6/26/2016
Dodge Mechanic: Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems replied 1 year ago
Chad Farhat
Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems
Category: Dodge
Satisfied Customers: 4,553
Experience: Owner at Carolina Auto Service &Sales , 20 years Experience in Foreign & Domestic vehicles
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Hi, I' m Chad. Welcome to JustAnswer. I' m reviewing your question now, and I will be post back with your reply ASAP

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Dodge Mechanic: Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems replied 1 year ago

Do you have a check engine light on at this time ?

Has a Diagnostic scan been performed to retrieve any fault codes from the vehicle?

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Customer reply replied 1 year ago
No check engine light and Diagnostic scan reveals NO codes
Dodge Mechanic: Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems replied 1 year ago

how many miles

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Dodge Mechanic: Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems replied 1 year ago

if all that checked out okay and no codes

i would be looking into a vacuum leak

a good scanner can pull up live data for fuel trims , long term and short terms fuel trims , is it possible to get those values at idle , engine running

and let me know , you can post them back here and i will see them

Thank You ***** ( aka - Jhook1398 )

ASE Certified Tech

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Customer reply replied 1 year ago
126,000 Km = approx. 78,000 miles
Also injection pump was replaced at approx. 50,000 miles as the lift pump had failed at that time the left pump was replaced and also an additional lift pump was added into the circuit with a pressure monitor - everything worked absolutely perfect until just recently
Customer reply replied 1 year ago
Firstly, where could there be a vacuum leak - I was not aware that there is any vacuum functions on the dieselSecondly I do not have a scanner that can pull live data - will try arrange this in a few days and get back to you
Dodge Mechanic: Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems replied 1 year ago

sorry my bad you do have a diesel , i had another 99 dodge truck gas got u mixed up .

I will opt out for a diesel expert for you .

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Customer reply replied 1 year ago
Thanks
Dodge Mechanic: sprinkles08, Chrysler/Dodge/Jeep master tech replied 1 year ago
sprinkles08
sprinkles08, Chrysler/Dodge/Jeep master tech
Category: Dodge
Satisfied Customers: 23,506
Experience: ASE Master and Advanced Certified, Chrysler/Dodge/Jeep Master Certified, Trans and Hybrid Specialist
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Hello and welcome to JustAnswer!

What you'll want to look at is the accelerator pedal position sensor. Voltage fluctuation can sometimes be too fast to see on a scan tool and is visible on a labscope, but if idle stays high for a few seconds then hopefully you'll be able to see it. I expect the APPS signal voltage is jumping up with the throttle closed either due to electrical noise on the circuit or (most likely) the sensor itself.

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Customer reply replied 1 year ago
I have been doing alot of web searching for a solution and it appears that there may have also been a recall for my truck which I never received but the recall indicates the up idle surges may require a ECM flash.
I will try to confirm the recall with a dealer and give that a try first.
Will let you know of the outcome in a week or so - hard to get into a dealership easyily
Dodge Mechanic: sprinkles08, Chrysler/Dodge/Jeep master tech replied 1 year ago

There weren't any driveability related recalls but there were a handful of software updates over the years. It wouldn't be a bad idea to make sure the ECM and PCM software is up to date but it's not likely that a software issue would just start to present itself on a 17-18 year old vehicle.

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Customer reply replied 1 year ago
Thanks
Dodge Mechanic: sprinkles08, Chrysler/Dodge/Jeep master tech replied 1 year ago

You're welcome!

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Customer reply replied 1 year ago
Will keep you posted once I get the problem solved
Dodge Mechanic: sprinkles08, Chrysler/Dodge/Jeep master tech replied 1 year ago

Great!

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sprinkles08
sprinkles08
sprinkles08, Chrysler/Dodge/Jeep master tech
Category: Dodge
Satisfied Customers: 23,506
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Experience: ASE Master and Advanced Certified, Chrysler/Dodge/Jeep Master Certified, Trans and Hybrid Specialist

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