1997 12 valve haze at idle

[Jhaley94]

Hey guys new to this forum but not new to Cummins, I bought a 97 2500 last week and it’s a good running very strong truck it’s all stock minus a 4 inch exhaust and an intake. Now on to my question and it may be normal for a 215 pump truck the truck hazes while it idling it’s not terrible but it’s noticeable I know my old 95 truck did when it was cold out but I live in South Carolina so it’s definitely not cold in August is there anything I should look into for a possible problem or is it just something normal for a 215 pump? Thanks for any input!

 

[dieselshadow]

Are you sure the injectors are stock? It’s quite normal for a larger injector to haze at idle.

 

[Jhaley94]

No I’m not sure if they are stock or not, I’m just going by what I was told the truck feels really strong to be a “stock” 12 valve and if you free rev it it will puff some black smoke but it doesn’t really smoke while driving I do know that it feels way stronger than my last two 12 valves but they were 160 and 175 pumps.

 

[GAmes]

No it isn't normal for a 215 pump to cause a haze. You have something else going on. Bigger injectors and timing are two that pop into my head. With close to 1.4 million on my pump, and stock Bosch injectors it does not haze even though I have a after market fuel plate and have advanced the timing a bit.

 

[Jhaley94]

Would it be to low of timing causing that? And out of curiosity wouldn’t a timing issue cause the truck to run rough and be low on power?

 

[JMalik]

Since smoke is a fuel/air balance problem it might be wise to make sure that all the components that effect fuel/air are checked to make sure that they are indeed OEM and in good condition. Then realize that by changing the exhaust system to 4 inch and likely removing the CAT that this will change the fuel/air balance. The so called smoke adjustment on the P7100 could then compensate for that problem by a tweek.

 

[Bob4x4]

The 215 horse did not have a cat and changing the exhaust will not addsmoke

 

[GAmes]

The 215 horse did not have a cat and changing the exhaust will not addsmoke

Yes it did come with a cat and I agree the 4" exhaust wouldn't add smoke.

 

[Jhaley94]

I installed a #6 fuel plate, played with the afc some, and also idled it up because it was idled super low like around 475-500 rpm and after doing all of that Most of the haze seems to be gone now.

 

[moparguy]

What???

Yes it did come with a cat

 

[GAmes]

What???

All 12 valve Cummins equipped Dodges produced between 1 Jan '94 and 31 Dec '97 were produced with Catalytic converters. That would include those with 215 HP. Did you not read Bob 4X4's post?

 

[moparguy]

I’m recalling the conversations from the late ‘90s where arguably a resonator on non-California trucks was mistaken for a cat. Mine’s behind the shop in a pile, now I’v Got to check it!

 

[GAmes]

No argument. Resonators I believe were a 24 valve thing. My cat is leaning against the wall in my garage next to the stock muffler.

 

[gcorron]

Yep. I'd be real careful before you toss the cat in the trash. IF you ever move somewhere you have to have it, OR if your local situation should change (Remember AOC is not alone in Congress!) you would sit on the curb and cry at the price of replacement.

I trip over mine in my shop now and then, but I'm sure not selling it for scrap!!!

George

 

[MZupkow]

My '97 cab & chassis came with a catalytic converter on it. I keep it in the shed, as it is extremely low mileage.