View Poll Results: GTS Owners: Does/Did you GTS ping, pink, knock, pre-detonate?
Yes. My GTS pings - I don't know why.
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11
18.33%
Yes. My GTS did ping but it was cured - fuel problem (pump, injectors, etc.)
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5
8.33%
Yes. My GTS did ping but it was cured - knock sensor and/or EZK problem.
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0
0%
Yes. My GTS did ping but it was cured - other problem.
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4
6.67%
Maybe. I'm not really sure.
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5
8.33%
No. My GTS does not ping as far as I know.
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11
18.33%
No. I'm sure that my GTS does not ping.
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24
40.00%
Voters: 60. You may not vote on this poll
GTS Owners: Does/Did your GTS ping, pink, knock, pre-detonate?
#136
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#137
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#138
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I can't yet say about the 5.4-litre engine, but for other Porsches I've owned:
6-cylinder 2-valve: Use 2-prong WRDC copper
6-cylinder 4-valve: haven't owned
4-cylinder 2-valve: Use 2-prong WRDC copper
4-cylinder 4-valve: Use 4-prong platinum
8-cylinder 2-valve: Use 2-prong WRDC copper
8-cylinder 4-valve: Use 4-prong platinum
I have seen 2-prong platinum and I do not like the apparent carbon buildup on them ... so I would not use them. Surprisingly ALL platinum plugs appear to have significant carbon on the 2-valves ... so I would not use them there. I have in the past both on 944 and 928 replaced Platinum +4 with WRDC copper and found MUCH cleaner burn.
6-cylinder 2-valve: Use 2-prong WRDC copper
6-cylinder 4-valve: haven't owned
4-cylinder 2-valve: Use 2-prong WRDC copper
4-cylinder 4-valve: Use 4-prong platinum
8-cylinder 2-valve: Use 2-prong WRDC copper
8-cylinder 4-valve: Use 4-prong platinum
I have seen 2-prong platinum and I do not like the apparent carbon buildup on them ... so I would not use them. Surprisingly ALL platinum plugs appear to have significant carbon on the 2-valves ... so I would not use them there. I have in the past both on 944 and 928 replaced Platinum +4 with WRDC copper and found MUCH cleaner burn.
#139
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I can't yet say about the 5.4-litre engine, but for other Porsches I've owned:
6-cylinder 2-valve: Use 2-prong WRDC copper
6-cylinder 4-valve: haven't owned
4-cylinder 2-valve: Use 2-prong WRDC copper
4-cylinder 4-valve: Use 4-prong platinum
8-cylinder 2-valve: Use 2-prong WRDC copper
8-cylinder 4-valve: Use 4-prong platinum
I have seen 2-prong platinum and I do not like the apparent carbon buildup on them ... so I would not use them. Surprisingly ALL platinum plugs appear to have significant carbon on the 2-valves ... so I would not use them there. I have in the past both on 944 and 928 replaced Platinum +4 with WRDC copper and found MUCH cleaner burn.
6-cylinder 2-valve: Use 2-prong WRDC copper
6-cylinder 4-valve: haven't owned
4-cylinder 2-valve: Use 2-prong WRDC copper
4-cylinder 4-valve: Use 4-prong platinum
8-cylinder 2-valve: Use 2-prong WRDC copper
8-cylinder 4-valve: Use 4-prong platinum
I have seen 2-prong platinum and I do not like the apparent carbon buildup on them ... so I would not use them. Surprisingly ALL platinum plugs appear to have significant carbon on the 2-valves ... so I would not use them there. I have in the past both on 944 and 928 replaced Platinum +4 with WRDC copper and found MUCH cleaner burn.
#141
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PET calls up 999 170 189 90 WR 7DTC and they are single electrode.
Do you have a Pt Number and I will see what I can get?
Do you have a Pt Number and I will see what I can get?
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Does it have the "Do It Yourself" manual transmission, or the superior "Fully Equipped by Porsche" Automatic Transmission?
George Layton March 2014
928 Owners are ".....a secret sect of quietly assured Porsche pragmatists who in near anonymity appreciate the prodigious, easy going prowess of the 928."![thumbsup](https://rennlist.com/forums/graemlins/bigok.gif)
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Does it have the "Do It Yourself" manual transmission, or the superior "Fully Equipped by Porsche" Automatic Transmission?
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928 Owners are ".....a secret sect of quietly assured Porsche pragmatists who in near anonymity appreciate the prodigious, easy going prowess of the 928."
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#142
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for more info and link to the Bosch lexicon.
#144
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Further information from the owner this morning....
- Both fuel pumps & fuel filter replaced within the last 2 months (<1000 mi)
- Fuel injectors rebuilt < 1000 mi
- Oil consumption: 1qt/800 mi avg, 1qt/500 mi spirited driving. Jim Morton says he gets similar results.
- Pinging worse and some heavy knocking with GT EPROM
So, several of the other solutions have been tried. The oil consumption is different from what I stated, but I wouldn't call it better. Jeez, do all GTS owners put up with this?? Egad!
So, if the later pistons have drain holes (??), then this is a combo of looser forged pistons and rings +/- some ring wear versus valve stem seals. We'll see if a leakdown reveals anything.
BTW, I see the controversy over plug types with strong votes both ways. In my S4 I've had both 4-prong platinums and the single electrode coppers at various times and couldn't tell any difference whatsoever.
- Both fuel pumps & fuel filter replaced within the last 2 months (<1000 mi)
- Fuel injectors rebuilt < 1000 mi
- Oil consumption: 1qt/800 mi avg, 1qt/500 mi spirited driving. Jim Morton says he gets similar results.
- Pinging worse and some heavy knocking with GT EPROM
So, several of the other solutions have been tried. The oil consumption is different from what I stated, but I wouldn't call it better. Jeez, do all GTS owners put up with this?? Egad!
So, if the later pistons have drain holes (??), then this is a combo of looser forged pistons and rings +/- some ring wear versus valve stem seals. We'll see if a leakdown reveals anything.
BTW, I see the controversy over plug types with strong votes both ways. In my S4 I've had both 4-prong platinums and the single electrode coppers at various times and couldn't tell any difference whatsoever.
#145
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- Oil consumption: 1qt/800 mi avg, 1qt/500 mi spirited driving. Jim Morton says he gets similar results.
- Pinging worse and some heavy knocking with GT EPROM
So, several of the other solutions have been tried. The oil consumption is different from what I stated, but I wouldn't call it better. Jeez, do all GTS owners put up with this?? Egad!
- Pinging worse and some heavy knocking with GT EPROM
So, several of the other solutions have been tried. The oil consumption is different from what I stated, but I wouldn't call it better. Jeez, do all GTS owners put up with this?? Egad!
#146
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Bill, do you have any good temperature measurements from this one yet?
Also,
- is the pinging at tip-in (only)? Or at part-throttle under load? Or something else?
- did the Diag tools give the car a clean bill of health? (You reported failed idle adaptation, but no reports on other stuff e.g. Idle/WOT, NTC-II, knock sensors, tank vent, ECU faults, etc.)
Also,
- is the pinging at tip-in (only)? Or at part-throttle under load? Or something else?
- did the Diag tools give the car a clean bill of health? (You reported failed idle adaptation, but no reports on other stuff e.g. Idle/WOT, NTC-II, knock sensors, tank vent, ECU faults, etc.)
#147
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I went out for lunch with a customer last week he drove his GTS and as he pulled away from a stop it was pinging pretty hard...it also uses too much oil.
#148
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Bill, do you have any good temperature measurements from this one yet?
Also,
- is the pinging at tip-in (only)? Or at part-throttle under load? Or something else?
- did the Diag tools give the car a clean bill of health? (You reported failed idle adaptation, but no reports on other stuff e.g. Idle/WOT, NTC-II, knock sensors, tank vent, ECU faults, etc.)
Also,
- is the pinging at tip-in (only)? Or at part-throttle under load? Or something else?
- did the Diag tools give the car a clean bill of health? (You reported failed idle adaptation, but no reports on other stuff e.g. Idle/WOT, NTC-II, knock sensors, tank vent, ECU faults, etc.)
The diagnostic shows no error codes and idle/WOT operating correctly. The owner now reminds me that on one test we got faulty O2 sensor a while back after the water injection was done. O2 could be fouled, but there were no error codes yesterday. We'll run all the test again.
It does fail the idle adaptation in an odd way (racing idle) and I haven't had a chance to inquire with John Speake and Theo about that. The ISV moves and responds to power, but we squirted some WD40 down the hose to it anyway.
#149
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#150
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I'm very surprised you guys would recommend using a hotter plug on a car that is pinging.
Bill, this may be a long shot, but can't hurt. Throw a quart of RISLONE in the engine. I would expect you are familiar with this stuff. It truly is one of the best products out there for cleaning up the inside of an engine and restoring power.
Bill, this may be a long shot, but can't hurt. Throw a quart of RISLONE in the engine. I would expect you are familiar with this stuff. It truly is one of the best products out there for cleaning up the inside of an engine and restoring power.