2V help needed

[Green96]

The Thunderturd has 100K miles, and pings at WOT. It has a tune, but it pings on the factory tune also. I have done a lot of things over the years including egr, dpfe, O2s, plugs, wires, cleaned maf, new fuel pump, fuel pressure reg, fuel filter, sea foamed,.... still pings. Other things I have considered are a bad fuel injector, bad maf (just not bad enough to code), vac leak (I can hear a very faint whistle under load but cannot actually find a leak). Maybe I should ditch the 2V and have Dennis put a 4V in it. Please help.

[magindat]

My vote is un-metered air.

...or the 4V!!!

[Blackened300a]

My 2V pinged recently as well. The combination of the heat and crappy gas made it ping. I since filled up with fresh gas along with cooler air and I no longer have a ping. I would think watered down gas is your problem.

[larryo340]

The 2V runs very lean so it doesn't take much for a ping. Mine will ping if it doesn't get 93.

I see your Bird is a '96. On the 4.6's in '91-'95 Town Cars, CV's, GM's we saw carbon build up within the EGR passages under the throttle body cause low EGR flow and when blocked it would kick on the engine light. On my '92 it was a nice side affect of no pinging after cleaning out those passages. I don't know if the '96's had the same passages as the older 4.6's, but it is possible. I don't have a manal for '96 to check for you. The only part required was a new throttle body base gasket.

Make sure to replace the DPFE hose as well, they start to close down with age.

Anybody else familiar with that?

[Dennis Reinhart]

The Thunderturd has 100K miles, and pings at WOT. It has a tune, but it pings on the factory tune also. I have done a lot of things over the years including egr, dpfe, O2s, plugs, wires, cleaned maf, new fuel pump, fuel pressure reg, fuel filter, sea foamed,.... still pings. Other things I have considered are a bad fuel injector, bad maf (just not bad enough to code), vac leak (I can hear a very faint whistle under load but cannot actually find a leak). Maybe I should ditch the 2V and have Dennis put a 4V in it. Please help.


1996 is a EEC 5 if you have a Xcal 2 you can data log it, and watch the STFT and LTFT, to see if its lean. I would check for a vacum leak, a bad EGR can also cause pinging a restricted fuel filter can cause the car to run lean.

[Marauderjack]

SEAFOAM IT!!!:beer:

[Green96]

I have changed the ERG valve and DPFE within the last 20k miles, seafoamed it, and changed the fuel filter. The 96 has the new style EGR and the port is not much of a problem, I have cleaned it but it probably did not need it. I will check the DFPE hose, I did not change it when I did the DPFE sensor. It has been going on for some time, so I don't think it is gas.
Sounds like a vacum leak should be my prime suspect since I am hearing a faint whistle anyway. If I data log, what should the STFT and LTFT read? The only other symptom I have is that it does not idle very smoothly. I would not really call it a miss, and it smooths out once I come off of idle, but it definitly is not the smoothest idling 2V 4.6 I have ever driven.
Thanks guys.