Gnrnr Posted 4December, 2022 Report Share Posted 4December, 2022 Hi all Just wanted to see what the collective wisdom thinks this is likely to be. Only started doing it this morning. It shakes the whole car as it stumbles. Started throwing codes, but I don't have a reader at the moment. Thoughts? My best guess is coils. Please excuse the potato I have for a phone.... Quote Link to comment Share on other sites More sharing options...
tomo Posted 4December, 2022 Report Share Posted 4December, 2022 21 minutes ago, Gnrnr said: Hi all Just wanted to see what the collective wisdom thinks this is likely to be. Only started doing it this morning. It shakes the whole car as it stumbles. Started throwing codes, but I don't have a reader at the moment. Thoughts? My best guess is coils. Please excuse the potato I have for a phone.... Coils test. There is a simple test for the coils to see if they are good or not. All you need is an ohm meter:Resistance between terminal 1 and terminal 15 at 20°C: 0.3 - 0.7 ohms. Anything outside of this range is suspect.Likewise on the spark plug connectors: Resistance: approx. 2 k ohmsOne potentially misleading issue with static resistance testing: Coils often test fine on the bench, but then break down electrically under hot load conditions. So if the unit is suspect, test it on the bench, but then swap it with a another coil pack from the engine that is working correctly and see if the misfire moves to that cylinder. If it does, the coil pack is toast. Gnrnr 1 Quote Link to comment Share on other sites More sharing options...
Gnrnr Posted 11December, 2022 Author Report Share Posted 11December, 2022 I had to move the car out of the shed this morning. Cold start sounded terrible. Instant Check engine light, idle was over 2000rpm and it just sounded terrible. I really need to get a code reader... Quote Link to comment Share on other sites More sharing options...
Gnrnr Posted 13January, 2023 Author Report Share Posted 13January, 2023 Not coils..... New plugs and coils and no change. tomo 1 Quote Link to comment Share on other sites More sharing options...
sjm Posted 13January, 2023 Report Share Posted 13January, 2023 How close is your independent Porsche specialist, they will only take a few minutes to diagnose with a reader. Also if in Vic, call Dave Brennan of 9XX Mechanical, formerly Nurburgring mechanical. He’s mobile and can diagnose as is a Porsche specialist. tomo and Yeatesy 2 Quote Link to comment Share on other sites More sharing options...
tomo Posted 13January, 2023 Report Share Posted 13January, 2023 Good idea sjm but I think Gnrnr is up at Winton . Quote Link to comment Share on other sites More sharing options...
sjm Posted 13January, 2023 Report Share Posted 13January, 2023 Cheers tomo, Dave has been known to travel to country Vic and NSW. Would prob ask just to see. Gnrnr, what i used to do in your situation was give the car an Italian tune up. Take it for a spirited drive and get up to redline. Just make sure there is no knocking as in bearing slop before going, and check oil + coolant level. Yeatesy 1 Quote Link to comment Share on other sites More sharing options...
Gnrnr Posted 13January, 2023 Author Report Share Posted 13January, 2023 2 hours ago, sjm said: How close is your independent Porsche specialist, they will only take a few minutes to diagnose with a reader. Also if in Vic, call Dave Brennan of 9XX Mechanical, formerly Nurburgring mechanical. He’s mobile and can diagnose as is a Porsche specialist. 250km away in Melbourne somewhere...... 1 hour ago, sjm said: Gnrnr, what i used to do in your situation was give the car an Italian tune up. Take it for a spirited drive and get up to redline. Just make sure there is no knocking as in bearing slop before going, and check oil + coolant level. Yeah oil and coolant is fine. I am going to ring a local mechanic and just get the thing scanned. Just haven't got around to making the call yet. I know the MAF was pulled out and cleaned at the last service which under 500km driving before the problem appeared, so probably the MAF. If the car sits idling for a bit it gets worse and doesn't clear with throttle. Found that out last week after I fitted up the new coils (I'd been wanting to do those anyway so no biggie). Quote Link to comment Share on other sites More sharing options...
Gnrnr Posted 13January, 2023 Author Report Share Posted 13January, 2023 2 hours ago, tomo said: Good idea sjm but I think Gnrnr is up at Winton . speaking of which there is a fun day on the 22nd if anyone is interested. I'll be there with my sons RX-8 helping him out. <Mine looks like it will be staying in the shed. Quote Link to comment Share on other sites More sharing options...
Gnrnr Posted 5June, 2023 Author Report Share Posted 5June, 2023 And we have an answer. The problem was a broken connection on the vacuum controller for the flap inside the plenum. New plenum assembly and all is now good. Only took 6 months.... 😭 tomo 1 Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.