ROG100

WOW - what a difference a pump makes.
My internal was toast and the external heading the same way.
Car now pulls really strong and NO pinging.
Did some really high speed runs and Zane could not hear anything apart from my heart beating.
The car has come alive again. Must have been a slow degredation of power.

Checked the car with the hammer and no faults. However that was the same before when it was pinging.

Dave, OOI I have the same plugs.

worf928

Looks like you drew the long straw Rog.

I've done both pumps, injectors, and a ton of Techron. No joy yet.

I haven't checked mine yet. It's a double-pumpkin right now. No registration and no (valid) inspection sticker. I'll be fixing that shortly.

But, the spanner gave me the same results. A previous check with a PWIS resulted in a 'knock sensor implausible' error. I'll be putting the Hammer to good use soon.

I wasn't surprised to find copper plugs in mine.

I went to a parts store on Sunday and asked them if they had any Bosch WR7D copper plugs with one or more electrodes. The response was 'what kind of car.' Ugh. Can't you look on the shelf bub? Apparently not.

928ntslow

I didn't pull the stamped numbers from the plug. Guess I'll do that tomorrow to check it on your chart.

Just taking a flyer here Dave, and you may think I'm crazy...the 3 electrode could be the problem. I had a conversation about plugs some time back with someone who is greatly respected in the 928 world. He shall remain nameless, but when I shared my thoughts about a simple plug for a street car, he 100% agreed and felt many fall to the marketing schemes of more expensive "better" plugs when they are only hurting performance. Sticking in a set of single copper electrodes just for ****s and giggles is a small price to pay JUST to see what happens....FWIW

cobalt

But the 3 electrode copper was the factory supplied plug. I am running them in mine and have never had a pinging issue.

Schocki

Just came back from the Stuttgart 30 years of 928 event. Had a great time with my VIP

Since I changed my internal fuel pump there is no pinging anymore. Read out the memory of my ECU numerous times and no faults. Car runs very strong and had no problems reaching 263 km/h or about 162 MPH on a free stretch of Autobahn on my way to the event.

I'm running BERU Ultra X and they are great, I prefer them over Bosch.

mark kibort

I think Don Hanson would beg to differ. ask him how much he liked the 4 prongers after one of the prongs ended up in his cylinder after breaking off.

Ill stay with stock porsche recommended stuff. good old bosch!

MK

Schocki

I'm not saying that I'm right or that a plug change will cure anything. It's just my experience over the years. BOSCH sells plugs in Europe that are not available in the US like the SUPER 4.
All my cars except the 911 have either 3 or 4 prong plugs and see the Autobahn on a regular basis. No problems, whatsoever.

This is the best plug from BOSCH in Europe right now. Recommended by Porsche.

cobalt

They sell the super 4 here in the US although it is not available for all car models.

Schocki

I could not find the SUPER 4 in the US or better TX.

BOSCH sells Platin plugs with multiple prongs in TX. But not the standard electrode types with multiple prongs. I gave my "used" SUPER 4's to Roger after I brought some BERU's with me from Europe. I think Roger liked them a lot...

heinrich

My GTS does not ping, whirr or pop ... in fact, it does nothing

heinrich

A commonly-known FEWC Porsche factoid is, (and I've seen this in-person with my 944 8V; 944S 16V; 928's (all 32V): 2-valve Porsches like the single-electrode plugs. 4-valve Porsches like the 4-prong plugs. It makes a noticeable ignition (read: soot and power) difference.

worf928

Has anyone gathered GTS engine temp data directly from either the Dash Diagnostics or the Hammer?

I finally got my GTS unpumpkinized yesterday. Afterwards I gathered some data with the Bosch hammer. After driving sufficiently to get the car to operating temperature as indicated on the dash gauge and by idle oil pressure, I did a test loop. The loop lasted about 5 minutes and included one first gear WOT burst. During the loop I monitored temperature with the Hammer. Just prior to the WOT burst I started a knock count cycle.

Afterwards I took my '91 for the exact same drive and gathered the same data. (Each of the cars has fresh coolant, oil, etc.)

The GTS was oscillating between 206 and 212 degrees.

The GTS counted 41 knocks during the monitoring cycle.

The GTS dash gauge never went past an approximate 180 degrees.

The GT oscillated between 189 and 196 degrees.

The GT counted 1 knock during the monitoring cycle.

The GT dash gauge never went past an approximate 180 degrees.

These results confirm my recollection of the temps I last gathered with an IR temp reader.

Today, just because I have the tool, I did a pressure test of the expansion tank cap on both cars. And both cars' coolant systems hold 12 PSI for hours.

The GTS' cap holds at 12 PSI. The GT holds barely 9. (Time for a new cap for the GT.)

I assume that the Hammer is getting its temperature data from the NTC-II (Temp II) via the LH and/or EZK. I would also assume that the GTS will run a bit hotter than the GT due to the higher compression ratio. But 206? 212?

Lastly, the dash gauge is obviously lying badly. The dash gauge gets its data from the sensor on the other side of the water bridge from the Temp-II.

SwayBar

Worf, have you tried using GT chips in your GTS? According to John Speake, that should cure your pinging GTS due to more conservative ignition timing with the GT chips.

That would be a nice simple fix.

Charley B

Any idea what that would cost? Is there a Vendor I can call and say "I need GT chips for my GTS to stop the pinging" and they would know what I needed? Are there multiple chips or just one? I hope these aren't dumb questions.

John Speake

It's just the EZK EPROM you need. Anyone with a SharkTuner could make one for you. Or I can supply. $30