Warning light on dash

[Slojoe72]

New to this motorhome, 1999 class A diesel pusher 350 cummins. A couple times on hard acelleration there is a yellow warning light comes on dash. What is that for?

[enblethen]

You could be experiencing something like turbo lag!

[Slojoe72]

I have that water fuel light as well ............. thats not it

just says ..... Warning ..........
in yellow on dash only comes on after I have had my foot into it, and then goes out once I let out of it for a few seconds

[chuckftboy]

Everyone here seams to think its air flow. I had a 1998 diesel that would flash an amber light (water in fuel) for just a second or two when ever I got hard into the throttle. Never did figure out why because my fuel and filers were clean. I blamed it on the low sulfur fuel I had to use but never really knew why.

[enblethen]

Many diesels have a system built in that when engine tries to suck air the small device operates to indicate basically the lack of air flow through the filter. I linked a photo of one earlier.
Do you have a turbo?

[Slojoe72]

^^^. Like what kind of air intake problem. What makes you say that?
Thanks. What should I look for?

[enblethen]

Still sounds like a problem with air intake!

[Slojoe72]

Has all new filters ..... It only happens when I acellerate quickly for several seconds. Once I let out and cruise along for a few more seconds at a reasonable speed the light then goes right out.

[crasster]

Sounds like an air problem to me, or something with the vac system.... Need more info if possible.

[sjholt]

Check your fuel filters. They may need changing.

[Slojoe72]

Nothing?

[vic46]

I had a 1987 Winnebago Chieftain with a 454 Chev that had an "efficiency" gauge the showed amber when my foot go a little heavy. Not sure this is the same!

[J_Walker]

The surest way to know is to read the engine code. A shop can do that for $$$ or you can buy VMSpc.

[Dakota98]

It's a caution light indicating you have a lead foot. :B

[enblethen]

It could be indicator for the air filter. Some rigs have a sensor that shows when the air cleaner needs to be cleaned or replaced.
Look at in the engine compartment for a small cylinder shaped unit. It should show green/yellow or red. As the air filter gets dirt air suction will pull the diagram from green toward yellow and then red. It may have an electrical switch connected to it.
May look something like this
Air filter indicator