Pinging NG?

[Jim Green]

--- duandcc_forums at cox.net wrote:
> The car is a 1987 Coupe GT Special Build (2.3 NG
> engine). Ever since i bought it it has has a pinging
> problem (even with 93 gas). Here's what I've done so
> far to try to fix it:
>
> 1. Multiple tanks of gas with Techron addative.
> 2. Replaced spark plugs (first with Bosch Plats,
> then with NKG non-platinum triple electrode).
> 3. Replaced knock sensor.
> 4. Replaced air filter (as scheduled)
> 5. Looked for/repaired a  vacuum leaks (bad seal on
> oil cap).
>
> I've had enough guessing on my own and am almost
> ready to take it to the DEALER. The car idles
> perfectly with no signs of vacuum leaks (not to say
> that there aren't any, just that it idles fine). The
> distributor still has the factory locking tab on it
> that locks it at 12*, so it doesn't look like the PO
> messed with the timing. I have considered changing
> the cap, rotor and wires, but I'm not sure this
> would be of any use, would it? Also, would you
> suggest trying a set of plugs that is 1 heat range
> cooler? Or is that the wrong way to "fix" the
> problem? Any thoughts or suggestions would be
> helpful.

Hmm, have you checked for sure that the timing is
still locked at 12* BTDC?  If they ever did the TB,
lifters, or water pump it could have been thrown off
some how.  I would start there, and also pull the
codes, they can be rather useful.  It has to be pretty
far out of wack to allow that ignition to ping so you
can hear it.  Something minor like cooler plugs
probably will not help things.

HTH,

=====
Jim Green
'89 90tq 034EFI, Haltech IG5
http://www.geocities.com/jeg1976/car_home.html

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