Hi, I just installed the tuning from a 1715 Micro tuner on my truck and it runs pretty strong. It adjusted the shift points for my tire size just fine and firmed the shifts as well.
My truck is a '99 F250 Light Duty #7700 package with the 5.4 L engine. Mods to the engine include 3" exhaust from the stock Y-pipe back, K&N air filter on the stock filter base with the end piece removed, stock air intake with the silencer removed, and polished throttle body.
The problem I have now is that it pulls very strongly to about 5000 RPM then it pings. REALLY BAD!!
I'm not sure what detonation sounds like but I do understand what it is and what it does. It sounds like a bucket of ball bearings being poured onto a piece of sheet metal until I let off the throttle so it will shift into second.
I would like to keep the shift points the way they are and fix the detonation.
Anyone got a fix for this?
I'm thinking I need colder plugs (got the stock heat range in now).
Do I need a colder plug?

 

Are you running a quality premium gas? Don't use Exxon.

 

yep my 4.6 does that too. I hit about 4 grand and it pings like theres no tomorrow. Im gona run some Chevron with techron before my next oil change hopefully that will help it. Pretty much all earlier 4.6's ping somewhat, but i havnt heard of the 5.4's pinging as badly.

 

it sounds like youe EGR is not opening all the way at WOT.

 

Unless something has changed since I went to tech school, the EGR sould not be open at all at idle or WOT. It is only supposed to be open at part throtle.

5000 rpm sounds like a lot for 5.4. I thought they don't rev like a 4.6 because of the long stroke.

 

i say plugs.

 

I would get ahold of Mike Troyer over in the computer forum and see what his take on this is.

Richard D.

 

hcmq,

Typo? The EGR should be closed at WOT. Maybe it is open?

Could you be hitting the revlimiter? You say around 5000 rpm. Does it seem like the engine wants to rev higher? Are you manually shifting?

JMC

 

no typo. However, I could be wrong. It has been known to happen!!

I thought that the higher the RPM's the more the EGR would open to allow more burnt gasses into the combustion chamber in order to keep it cool. If the EGR closes at WOT you get only gas and air in the chamber and the internal surface temps go way up and produce detonation.

Or it could just be the rev limiter and his tach could be off a few hundreds!

 

.......so if it is his EGR ("flying saucer" with small green vaccum line hooked on top of it?), it needs to be replaced?

...........if he is hitting the rev limiter with his new shift settings, would it make a sound like pinging? or does hitting the rev limiter CAUSE pinging? ......and if so, does his shift points need to be adjusted to eliminate pinging?

.....I have same problem sort of...

 

as far as I know the rev limiter kills the gas to the engine so I guess you might get a "Pinging" sound.

He could check his tach with the electronic odometer test and maybe he does need to adjust his shift points a little lower?

if in fact it is the EGR it prolly just needs to be cleaned.

 

Im guessing the rev limiter. If he increased the shift points, but not the limiter, then he very well could be running into probs.

5000 is around where a stock 5.4 shifts.

Iron horse-
what is your shift point set at? Just for a thought, set it lower than what it's at now. Maybe 5400? I know you have a chip with your blower, so your limiter is already set higher. I'd set the shift point lower and see if your pinging goes away.

 

WOW, thanks for all the replies.

If it's a EGR problem it should be showing a code or a SES light, no code no light.

Mike Troyer says bad gas. Tonight I will put some mobil premium in it and run some octane boost to see what happens.
Can you guy's recommend a good octane booster?

With the stuff I did to my intake and with the 3" exhaust it revs very freely and seems to pull just as hard at 5000 as it does at 4500. And it doesn't stop pulling till it pings.

With my 1715 and my comp code "wij3" there was no adjustment available in the tuner to raise the rev limit, so I don't know what the rev limiter is set to.

Is 5000 the stock shift point? I thought it was at 5400.

What can I do to clean the EGR? Or does it just need to be replaced?

Am I hoping for too much to get it to shift at 54-5500 RPM?
Should I not be revving it that high?

 

HI!... A basically stock 5.4 only makes it's max H.P output at about 4850RPM. So revving it over 5000RPM is useless and actually slowing you down in the 1/4 mile.

 

I would think a good throttle body cleaner or carburator cleaner should do the trick. You may want to check and clean all the lines that hook up the the DPFE I think it is and even the DPFE which is right by the EGR valve.

Richard D.