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Bad fuel economy and black smoke when just push a little bit…

Customer Question
Bad fuel economy and...

Bad fuel economy and black smoke when just push a little bit hard on fuel

Mechanic's Assistant: Has the vehicle turned into a gas hog? And how does it start -- same as usual?

And sometime little bit hard to start

Mechanic's Assistant: What is the model/year of your Dodge?

2006 ram 2500 cummins

Mechanic's Assistant: Are you fixing your Ram yourself? What have you tried so far?

I change 1 injector by myselft couple months ago for white smoke at idle it was fix

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

Not really

Submitted: 11 months ago.Category: Dodge
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Customer reply replied 11 months ago
Cp3 pump can destroy injector ?
Customer reply replied 11 months ago
All filters are cleanAnd i also have fass fuem system for lift pump and filtration
Customer reply replied 11 months ago
Hello?!
Answered in 19 hours by:
8/8/2017
Dodge Mechanic: sprinkles08, Chrysler/Dodge/Jeep master tech replied 11 months ago
sprinkles08
sprinkles08, Chrysler/Dodge/Jeep master tech
Category: Dodge
Satisfied Customers: 24,063
Experience: ASE Master and Advanced Certified, Chrysler/Dodge/Jeep Master Certified, Trans and Hybrid Specialist
Verified

Hello and welcome to JustAnswer!

There are a handful of things that could be going on but if you're having poor fuel mileage and excessive black smoke then the most common cause would be injector wear. A long crank time is also often caused by injector wear.

Have you checked for fault codes?

When did this problem start opposed to replacing the one injector?

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Customer reply replied 11 months ago
The problem always have been there i replace one injector because white/blue smoke at ilde and he was smelling fuel not burn at the exhaust
Customer reply replied 11 months ago
no i don't have fault codeI hope i didn't paid 36$ canadian for juste this ansher
Dodge Mechanic: sprinkles08, Chrysler/Dodge/Jeep master tech replied 11 months ago

Can you elaborate on what you mean by always? Do you mean it's been the same since the truck was new?

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Customer reply replied 11 months ago
No i mean i always have been a alcholic since i have de truk (1 year) and cranking 3-4 sec before start sometimes
Customer reply replied 11 months ago
The truck always have been a alcholic not me hahah
Customer reply replied 11 months ago
Long cranking is intermittent
Dodge Mechanic: sprinkles08, Chrysler/Dodge/Jeep master tech replied 11 months ago

Is there any smoke at idle now?

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Customer reply replied 11 months ago
a little bit and smell
Dodge Mechanic: sprinkles08, Chrysler/Dodge/Jeep master tech replied 11 months ago

That would go along with the hard start, smoke on acceleration and poor fuel economy then. If you're seeing smoke and/or a fuel smell from the exhaust at idle it is due to cold combustion, either from worn injectors or low compression. Injectors are much more likely to be the cause.

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Customer reply replied 11 months ago
Ok so i change the 5 other injector ?
Dodge Mechanic: sprinkles08, Chrysler/Dodge/Jeep master tech replied 11 months ago

Testing would be necessary to know for sure if that's what needs to be done, but that's the most likely cause for what you're describing.

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Customer reply replied 11 months ago
Testing injector ?
Dodge Mechanic: sprinkles08, Chrysler/Dodge/Jeep master tech replied 11 months ago

What would need to be done is an injector return flow test using some special fittings and a scan tool. Return flow is measured while running a fuel pressure override test and if it fails then the injectors are replaced as a set.

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Customer reply replied 11 months ago
A lot of mechanic tell me ..
Dont loosse your time put 6 new bosch injector
Dodge Mechanic: sprinkles08, Chrysler/Dodge/Jeep master tech replied 11 months ago

If one fails electrically then you can usually get by with replacing one. If you have a mechanical or wear issue then it's recommended to replace them as a set.

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Customer reply replied 11 months ago
Bad on fuel not mean worn ?
If it is they all have the same millage same fuel have passed in the injectors ?
Dodge Mechanic: sprinkles08, Chrysler/Dodge/Jeep master tech replied 11 months ago

If all injectors have the same mileage then they're all going to be worn in a similar way, which is why they should be replaced as a set when you have a wear issue.

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Customer reply replied 11 months ago
if i dont want to paid for testing if im pretty sure its the injectors i can take the risk to change them all
Dodge Mechanic: sprinkles08, Chrysler/Dodge/Jeep master tech replied 11 months ago

If you don't want to pay to have it diagnosed then I would recommend replacing the rest of the injectors or all six.

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Customer reply replied 11 months ago
Its a expensive risk but it really look like to be the injectors right ?
Dodge Mechanic: sprinkles08, Chrysler/Dodge/Jeep master tech replied 11 months ago

Yes.

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Customer reply replied 11 months ago
I will change the 5 other injector and the one i have changed is #2 so he is not a big job to change if i have to
Dodge Mechanic: sprinkles08, Chrysler/Dodge/Jeep master tech replied 11 months ago

Good luck with your repair!

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Customer reply replied 11 months ago
I forgot to tell you i did a cylinder contribution test and they were all weard. 88 107 92 105 ect...
Dodge Mechanic: sprinkles08, Chrysler/Dodge/Jeep master tech replied 11 months ago

That's a big issue, poor cylinder performance is usually caused by injector issues.

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Customer reply replied 11 months ago
i cant really be wrong
Dodge Mechanic: sprinkles08, Chrysler/Dodge/Jeep master tech replied 11 months ago

Unless the problem is low compression, which is much less common that worn injectors.

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Customer reply replied 11 months ago
I have 0 blowby in valve cover or in the pan so i guess its the injector
Dodge Mechanic: sprinkles08, Chrysler/Dodge/Jeep master tech replied 11 months ago

Most likely.

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