Pinging

Have you tried pulling codes yet; even if your light isn't on?

Well, I have double your mileage, but I had this problem and changed everything, checked everything... nothing seemed to help. I seafoamed the engine too, nothing. My problem turned out to be the distributor shaft. the bearing was so worn out that the reluctor wheel was smashing into the PIP sensor and thus damaged it. Fixed the dizzy, replaced the PIP and was good to go.

You probably don't have this problem since you have low miles, but in case someone finds this thread with the same problem, it might help.

I had the same problem about 6k ago, roughly 161k. Changed to premium fuel and seafoamed it. Seemed to do the trick. Just my 2 cents.

The_Mustang said:

My problem turned out to be the distributor shaft. the bearing was so worn out that the reluctor wheel was smashing into the PIP sensor and thus damaged it. Fixed the dizzy, replaced the PIP and was good to go.

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What miles are you at? Just curious if this recurring problem with our cars so I don't end up spending a ton of money trying to figure it out.

I'm probably at 170-180ish

Awesome, that's about 3k from now. Seems like the only cash I can get into this car is for repairs lol.

desertcox05 said:

maybe your HB has slipped and your not really at 13 deg.
what's the water temp when it does it. Mine would ping like that after sitting in traffic on a hot day

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bad balancer is leading problem to cause this

If its happening at high load/hard excel its not the EGR as it turns off/closes either way at WOT (failing open would only cause a richer mix that would help reduce ping). Now if it was doing it at say 50-70mph at cruise on the hwy EGR would be a big possible option if it fails closed you will get a lean A/F and cause a low load ping/bucking (also common if EGR is deleted and not shut off in the tune).

As common as our HB's fail it is worth checking out for sure as you may be running 18-20* at the ball and not even know it if its spun/going bad. A solid tune up for the 94-95's if purchased now should include plugs, wires, cap, rotor, fuel filter, air filter, and a new HB.

One thing to remember our 94-95's run HOT from the factory. One thing I noticed putting in a 190 stat and turning the fans on to match those figures keeping it cooler stopped the ping.

I have 10.33-10.6 comp on a iron head gt40 motor, run the stock rad., live in a area that gets 100-110 temps with 90+% humidity in the summer and have ran 32-33* total timing (28 is stock IIRC). I have even ran 91 with no issues at 32*. Datalogged temps and autometer guage show 192-194* as well. 20-30* colder than stock will help greatly to stop ping.

blksn955.o said:

I have 10.33-10.6 comp on a iron head gt40 motor, run the stock rad., live in a area that gets 100-110 temps with 90+% humidity in the summer and have ran 32-33* total timing (28 is stock IIRC). I have even ran 91 with no issues at 32*. Datalogged temps and autometer guage show 192-194* as well. 20-30* colder than stock will help greatly to stop ping.

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Was this before or after you started Tweecing the car?

After, as it was the combination of going with a colder stat and moving the fan turn on points that I saw the issue stop.

First off, it's common knowledge that GT40 heads with their different combustion chamber design don't lend themselves to detonation nearly as bad as their E7TE counter parts.

Second, you have tuned your car, so you can't really say you're getting away with x amount of timing when you have tuning ability. For instance, you have to be able to tune the car somehow to adjust the fan turn on temps. I'm not sure how you modified your fuel and spark tables, but to my understanding it is one of those values that is programmed into the T4MO computer that promotes pinging in the first place.

So obviously if you combine a tuning device with a "less likely to ping" cylinder head, of course you can run more timing and be safe. As it stands, If I set my timing to anything over 10* it'll ping like crazy! And I do have a new balancer and just about everything else as well.