I have a detonation when im part throttle. At 1st it sounded more like oil starvation. but now im certain its detonation. I changed the plugs, fuel filter and its still doing it. It doesnt do it as much after the truck is fully warmed up(about 25 miles) I run 91 oct. in it. I have no codes at all. I did notice a couple of plugs were pretty worn out with massive gaps. But they did have 97,000 miles on them.
Could it be a coil, knock sensor, or maf sensor? or even bad injectors. I really dont want to go get ripped off by a dealer, but I also dont want to buy a bunch of parts I dont need.

 

Sure it isn't a loose exhaust heat shield? Sure sounds like it. Especially when you say "It doesnt do it as much after the truck is fully warmed up(about 25 miles) .

Oh, and welcome to FTE

 

DO all the regular maintenance first. Clean the MAF, change the fuel filter, check for vacuum leaks, etc.

If you have an automatic, check the cover on the bottom of the bellhousing. It tends to rattle at 1600-2200RPMs at part throttle.

Also, one trick to try is: RESET the computer! Disconnect the battery, turn on the headlights, and leave it for a few hours.

In the past 6 years, I've heard of plenty of V10's pinging that needed a reset to clear it up. Especially in that 2001 timeframe.

 

Thanks guys, Im going to pick up some TB cleaner and clean the maf. Ill also disconect the battery while doing this. I hope it works.

 

Why the 91 oct fuel? Are you running this all the time? Or did you switch to it to try and correct the ping?


biz

 

Yeah, that's what I'd like to know...

Welcome to FTE!!!

 

While I'm never off the throttle enough to allow any carbon buildup, you know there is "octane addiction" in modern motors? Carbon builds up because the higher octane gas doesn't burn as completely as regular. The carbon builds up to the point where it pings. Then, you need even higher octane to keep it from pinging. Until it does it again.

At least, that's the theory...

 

I moved to las vegas from long island NY and once I got to the higher elevation it was pinging like crazy. Once I switched it went away. I wish I could run 87.

 

This pinging is totally different then the need for higher octane ping. The ping that I had was at higher rpms. That was corrected by using higher octane. The ping I have now is at part throttle. I checked out my maf and it looks like it does need a cleaning. Ill post what happens tomorow. Thanks again guys.

 

Sounds, first, like exhaust heat shields or the tranny bellhousing cover.

But clean the MAF and reset the computer.

I wonder, does your engine have an EGR valve? If so, that part-throttle is right where it should be opening. And when they don't open, some vehicles ping.

 

Hmmm...New York IS one of the green states that require EGRs...curious...

 

Up until 2007, that wasn't the case for "heavy-duty truck engines".

CA REQUIRES an EGR (and all green states that adopted CA's emissions rules) for 2007 trucks up to (I think) 14,000 lbs.

Somewhere, somehow, the V10 had an EGR and then it went away.

 

Just a thought, but I wonder if you would be a good candidate for a re-flash for your PCM? I wouldn't think that the programs would be region specific, but then again...back in '01 FORD was still in the dark ages when it came to the PCM on those SD's compared to the '05+ SD's.

If anyone else has an opinion on this thought...please lets here it...


biz

 

Not to hijack a thread.....

I have had detonation issues for some time now. 93 octane just about solves the detonation issue. On 87 the ping is a 10 on a scale of 1-10 and with 93 octane it is about 1 or 2.

Now is the time to bring it to someone to look at it. Should I use the dealer incase a reflash will help with the problem or bring it to a very trusted repair garage?

 

Well after cleaning the maf and disconecting ther battery for a while it did get a little better. I talked to a buddy in NY and he said there is most likely an update for the computer. So Ill swing by my local dealer and see what they say.