is yours the HEMI?

 

Sound like that dealer doesn't have ANY mechanics. Long-term, pinging can have serious consequences. Have you tried new spark plugs. I know 15,000 seams early, but my 4.7 dakota used to tell me when it was time for a plug change by pinging.

 

If it is pinging then premium gas would have some effect. It wouldn't be the same on 87or 89 as it would be on 93 octane.

 

What gas do you normally run?

 

mine did the same thing and my service manager gave me a bottle of fuel treatment and told me to go to walmart and pick up a 100% rubbing alcohol and pour them both at the time of a full tank fill up. It stopped the pinging a little but much better than before.

 

what gas are you guys running?

 

If it is pinging then premium gas would have some effect. It wouldn't be the same on 87or 89 as it would be on 93 octane.

What? - Running higher octane is the most common cure. I've encountered pinging on many vehicles. I just run higher octane until I find out if the cause is a malfunction then switch back. Do a google.

 

I agree that higher octane should fix this (I had a 99 ram with a leaking intake manifold that required a progressively higher octane as the leak got worse).

I can only assume that in this case the octane is not helping because the computer is trying to run too lean. Maybe programmed this way to help Dodge's overall CAFE numbers (thats the reason I heard the '06 motor oil spec was lightened up).

 

I hear a rattling sound while towing our 5th wheel if it shifts to O/D. (4th gear .75 O/D with tow/haul mode on) As long as it stays in 3rd (direct) it doesn't do it or I can't hear it over the exhaust music. It sounds different than any pinging I've heard but it only does it under slight load and in O/D. I thought maybe that's what pinging sounds like with aluminum heads so I tried 93 octane at $2.559 a gallon for 300 miles. It didn't change the sound a bit. I then thought maybe it's an exhaust rattle or the bed as it sounds like it's coming from under the truck instead of through the firewall. I even thought maybe it's unburned fuel cackling in the exhaust. From the old days of ringing headers, it sounds familiar. Who know but I have it too...

 

I just came across this information last night....check this adress:

http://dodgeram.org/tech/gas/Trouble/ping.htm

Hope it helps with the Hemi too....

 

There is some truth to all this. my 05 hemi ram pings/knocks. now on my 72 Mach1 351 4v cj at 11&1/2 to 1 i run 110 (6 bucks a gal ) cam two racing fuel . this seams to get ride of the spark knock. But what do you think will happen it i mix it with 93oct on the hemi?

 

There is some truth to all this. my 05 hemi ram pings/knocks. now on my 72 Mach1 351 4v cj at 11&1/2 to 1 i run 110 (6 bucks a gal ) cam two racing fuel . this seams to get ride of the spark knock. But what do you think will happen it i mix it with 93oct on the hemi?

You shouldn't have to mix for your Hemi in order to get rid of spark knock. It wouldn't hurt anything except at most a slight drivability issue when cold. If it does get rid of the knock/rattle then look for why you are running so lean. Or maybe pulling in oil from somewhere. Yes Spark knock does respond to octane. :rck:
If octane has no effect on the rattle/knock then,short of alot of oil being burned, are you sure you're hearing spark knock?

 

I got next to a 2nd gen Ram today that had an exhaust rattle. Don't have a clue if it was the cat or muffler but it sounded exactly like mine sounds when it makes it's noise. It only does it towing our 5th wheel in 4th gear. Maybe the exhaust gets hot, a cat or muff expands enough to rattle. I can't make it do it without the load on it. Must not get hot enough. I think mine's not detonation but a rattle in the exhaust somewhere.

 

I have a 04 Hemi and have not had any ping. Yet!!
Warm weather is right around the corner though.
I use nothing but Union 76 89 octane.

 

There is some truth to all this. my 05 hemi ram pings/knocks. now on my 72 Mach1 351 4v cj at 11&1/2 to 1 i run 110 (6 bucks a gal ) cam two racing fuel . this seams to get ride of the spark knock. But what do you think will happen it i mix it with 93oct on the hemi?

The first thing that will happen is your catalytic converter will be shot if you mix leaded racing gas with unleaded.

 

There is some truth to all this. my 05 hemi ram pings/knocks. now on my 72 Mach1 351 4v cj at 11&1/2 to 1 i run 110 (6 bucks a gal ) cam two racing fuel . this seams to get ride of the spark knock. But what do you think will happen it i mix it with 93oct on the hemi?

I used to have a 70 Mach 1 with the same engine and used the same gas - but the one I used had lead in it so you may want to check the label before adding it to your truck. Some Union 76 stations sell 100 octane. You used to be able to search to see which stations carried it by going to their web site.

 

I have the pinging problem as well with both the factory flash and the tsb re-flash. The truck pings on all three octanes 87, 89, and 93, but less so as the octane increases. I had the same problem on the Mustang when it was near stock and the only way I could get rid of the problem was to change to a cooler plug. Might have to be something to consider in the near future. Other than that, to the guys that have the tuner, play with the fuel/timing maps at part throttle and bring that a/f mixture down to 13(.5):1 and that should get rid of that prob. along with giving you a little more torque.

 

Assuming it's not pulling in a bunch of oil I have to wonder if there are some cylinders running lean. Maybe a bad injector or 2.