North American Turbocoupe Organization



pinging at low rpms?
rich Offline
Member
#1
Hi

One more question. It seems that I have pinging when the engine is cold at low rpms. Once my boost/vac gauge gets above 0 (into boost range) noise disappears. It also disappears when hot. No pinging at all under boost or WOT.

Got a 255lph installed. Timing on the money at 10* with spout out.

I also can hear it, very feintly, while in park and reving at 3k and above. Most noticeable driving slow though.

Now I am starting to think that it may be something else because as it heats up, it stops.

Any ideas?

Thanks
2.3L Turbo in 88 stang, browntops, 93 a4ld, volvo ic, broncoII rad, gillis valve set @15, k&n af.
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Pete D Offline
Administrator
#2
are you absolutely sure it's pinging as in detonation? I ask because what you are describing are the conditions where actual detonation is least likely - cold, low rpms, light load and yet it's disapperaring when it gets warm and/or you get into boost. Warm and in the boost are where detonation usually occures. are you sure it isn't lifter noise or noisy fuel injectors.

If it is detonation then I think you could have an EGR problem or a vacuum leak.

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NATO Member. it's not a vice, it's an obsession
Good judgement comes from bad experience, and a lot of that comes from bad judgment.
88 TC X 2, 86 SVO, mods list at
http://www.turbotbird.com/showroom/pd_88tc.htm
Pete Dunham


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