Jordan Owner/Technician Ontario Posted Latest
2017 Porsche 911 Carrera 4S 3.0L (DCHA) 7-spd — WP0AB2A98H⦁⦁⦁⦁⦁⦁⦁
P0638 — Throttle Actuator Control Range/Performance Bank 1
P2176 — Throttle Actuator "A" Control System - Idle Position Not Learned
P0300 — Random/Multiple Cylinder Misfire Detected
P0306 — Cylinder 6 Misfire Detected
P0301 — Cylinder 1 Misfire Detected
P0305 — Cylinder 5 Misfire Detected
P0304 — Cylinder 4 Misfire Detected
Misfire
Shudder
Psmfailure
Hello DN community
My names Jordan I own an automotive repair facility in northern Ontario Canada.
I just did my first plug and air filter change on a 2017 Carerra 4S, I was very diligent and careful with the procedures. I removed the rear fascia to replace the air filter, and I removed both rear wheels and liners to replace plugs. I also removed the turbo inlet pipes, they are an accordion style and they sort of pulled out of the socket as I pulled the pipe off and by pulled out I mean the accordion expanded, unsure if maybe I need to push it back, I don't believe they are broken. As I stated I did do a smoke test...I used Genuine Porsche parts from the dealer for the filter and plugs..
Unfortunately when I went to test drive the vehicle, it almost had no throttle and was misfiring. I scanned for codes and found codes for cylinders 1 and 4 misfire, random multiple misfire. If you tried to go full throttle it would shutter very bad.. I was gentle with removing the coils but they were a bit tough to get out but none appeared to be broken. I swapped the cylinder 1 plug and 4 plug with the old plugs (***was running fine before*** and the misfire was completely gone on 1 but 4 was still misfiring slightly. Then cylinder 6 started to misfire, I swapped coil from 6 to 5 thinking there is no way all his new plugs are bad. #1 plug was bad for sure when put it in another cylinder hard miss. Now 5 is a hard miss (coil from #6) and 6 is missing as well...thinking plug..
Did i potentially pull too hard on the coils and now they are damaged? Out of the 12 years in the trade I've never had this happen. And I'm sort of upset with myself as I don't know what I did wrong. I have read countless threads on how to do this and all were successful.. due to the fact it's a very well respected client and a top of the line vehicle. I spent over 4 hours swapping coils, plugs, ensuring they are seated correctly, I ended up putting a little bit of die-electric grease over the ceramic portions of the plug as I figured maybe I didn't seat them all the way..
I removed the rear fascia again to double check my work for the air filter all looks OK. I smoked tested the charge pipes to TB and found no leaks..
The codes I have are Multiple cylinder misfire especially 1 5 6 P0638 Throttle Valve Adjuster (spring test) - This code is pulled using my Autologic Drive Pro, with my Autel Ultra I got the codes P2176 But same description as above, Also PSM Failure but that's likely due to the ignition coil(s)...
Can I ask just for the experienced members and even anyone who has an idea of maybe a step I did wrong when doing the air filter or the plugs? I advised him I'm warrantying all the plugs due to the one failed one out of the box and I recommend replacing all the coils. If it still misses after that. I'm unsure where really to go
NOTE*** I did reset all adaptations as I figured with a new filter air flow will change as well as LAMBDA ETC. I also did a throttle adaptation figuring maybe it needed to be adapted after the air filter?
How about pin tension? It's only got 60k im sure plugs are original and I didn't obviously pry the coil connectors off.
Thanks I really hope I can get some good responses. Jordan.
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AiDN AI Assistant
California
AiDN
This is a reply from an experimental AI-powered advisor. It is important to exercise caution, verify information from multiple sources, and make informed decisions based on the prevailing circ*mstances.
Jordan, it seems like you've covered a lot of bases already, but let's address a few potential issues: - Coil Damage: Given the difficulty you experienced removing the coils and the subsequent misfire issues, it's possible that the coils were damaged during removal. Resistance and continuity tests on the coils can help confirm their integrity. If they show any signs of damage or…
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Howard Mechanic
North Carolina
Howard
Did you torque the spark plugs to spec? I used to be an import tech and found out quickly that the spark plugs have to be torqued to spec and then indexed properly or they will misfire. Throttle codes are probably set because of the misfire, in order to protect the engine and catalyst.
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Jordan Owner/Technician
Ontario
Jordan
So Prodemand showed a torque for 24 FT LBS, I had no service information elsewhere I believe ALL DATA said the same. New plugs 24ft lbsUsed 19 Ft lbs
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Howard Mechanic
North Carolina
Howard
That’s a start. I’d take a look through the r&r section to see if the plugs require a certain number of degrees turn after the initial torque. I’ve had some Mercedes that will show a torque in the “specification” tab, but not the 70 something degree turn you needed to properly index the spark plug
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Jordan Owner/Technician
Ontario
Jordan
Prodemand and ALLDATA give no helpful information other than the torque spec no R&R First step on both is remove ignition coils Then spark plug torque spec..
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Howard Mechanic
North Carolina
Howard
Okay. If there’s no extra degrees turn, then as others have mentioned, I would examine the plugs for cracks in the insulators. I have both cracked spark plugs and have had spark plugs that have been cracked fresh out of the package.
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Obie Technician
Washington
Obie
Silly questions, but you did not put anything on the plug threads did you? And are plugs the exact duplicates of the old ones? Dealers make mistakes like everyone else.
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Agree
Jordan Owner/Technician
Ontario
Jordan
Parts numbers match and plugs match identically yes.
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Hollis Technician
Colorado
Hollis
Jordan, I believe what Obie was asking in reference to putting anything on the spark plugs, like anti-seize, can/may cause misfires.Most modern/quality spark plugs threads have a special coating/treatment to reduce corrosion and seizing without compromizing electrcal conductivity.
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Jordan Owner/Technician
Ontario
Jordan
No sir, nothing was placed on the threads.
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Hollis Technician
Colorado
Hollis
Did you remove the spark plugs of the affected cylinders and inspect the ceramic insulators for cracks?IIRC, the majority of plug sockets for those are 12 point, with no rubber cushioning inside, it's easy to crack an insulator with that type of socket.
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Jordan Owner/Technician
Ontario
Jordan
That may be the case. I used the BMW spark plug 12pnt socket I am going to remove them all today and check resistance.
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Hollis Technician
Colorado
Hollis
Insulator cracks examples.google.com/search?sca_esv…
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Robert Technician
Michigan
Robert
Just a thought did you check the gap I show 0.028 3.0 6 cylinder, I gapped a Jeep wrong once that thing wouldn't even run dealer plugs.
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