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sprinkles08, Chrysler/Dodge/Jeep master tech
Category: Dodge
Satisfied Customers: 22654
Experience:  ASE Master and Advanced Certified, Chrysler/Dodge/Jeep Master Certified, Trans and Hybrid Specialist
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Dodge 3500 4x4: 98.5 cummins rough idle in gear smooth as

Customer Question

98.5 cummins rough idle in gear smooth as lift pump and filters. no air or fuel leaks.inj kill test showed nothing. 4 codes present po122 apps low volt, replaced. po216 pump timing.po236 map to high out range checks good. pulling hair and going bald quickly
Submitted: 2 years ago.
Category: Dodge
Expert:  sprinkles08 replied 2 years ago.
Hello and welcome to JustAnswer! Injectors are a common cause of a cylinder misfire but injector issues weren't common on these. If you couldn't tell anything by killing cylinders then the issue may be something that is affecting all cylinders. If it was an injector or cylinder sealing issue then at least one cylinder would be weaker than others, but without having misfire monitor it's hard to tell what is really going on. It would be a good idea to take a fuel sample if you haven't already to make sure it isn't contaminated. Contaminated fuel would explain not being able to determine what cylinder is missing. The MAP sensor code is going to be the sensor or wiring, almost surely the sensor. P0216 is an internal failure in the injector pump as long as it is being supplied with ample fuel. Usually this will just cause the engine to return to idle when the code is active but if you don't find an issue with the fuel then replace the injector pump and re evaluate it, the injector pump needs to be replaced regardless.