Ok so I don't think anyone was looking at my other thread anymore so I made this one. On my quest to find and fix noises and bumps, there was a very annoying metallic sound at 80-100km/h only when throttle is either held or pushed down. Also happens under acceleration, but not continuous, comes and goes. It sounds like something metallic rattling around. Mum of all people recognised the sound from her past old cars and explained it to Dad who said its pinging. And I do believe so now, I've noticed lack of power lately how he said the sound of pinging should sound like, it's exactly the same! So I need recommendations on what my steps should be to resolve this. I have a new s2 PTU, new fuel filter and lines, new NGK platinum r's, new plugs on everything, and injectors serviced, all recently done. Concidering the above what should I do? Would I go dyno and tune? Or just tune? I don't have the fancy tune stuff that some of y'all have to check faults... Thoughts? Cheers
My Zed has had the exact same thing for the last 9,000KM now. When I hear it I turn overdrive off which usually gets rid of the nasty sound. I find it around 1800-2200RPM in 4th gear when I am just cruising under some load (like up a hill or something). The following needs checking: - Ignition timing may be too advanced and needs to be retarded - timing light - Check fuel pressure is correct - Check to see if your system has any vac leaks (this will lean your fuel mixture with unmetered air) Let me know how you go. Has it recently just been happening in the hot weather ? Check your ECU too for error codes - you may be getting a code 34 which means there is a failure in the detonation sensor. This can cause a power loss by sending the ECU into safety maps.
I don't have a timing light, maybe I should get one, if with one I can adjust and maybe fix the issue myself? I may have a vac leak... I could be suss on maybe my homemade gasket (don't laugh, it was made from gasket material, I was caught with my paints down when it didnt arrive with the other gaskets, and the plenum was off! It's a daily too ) Maybe more so in the heat, it's gotten worse I believe. Det sensor? I have a new one, but is it replaceable with plenum off? Also I don't have a fault checker do-dad on my ecu? Is it just jap spec?
Wouldn't it be better to rectify the cause of the pre ignition or detonation, rather than drive it for an additional 9,000km? That noise you hear is a collision between the pistons & flame fronts in the combustion chambers, the air/fuel mix has ignited too early & is expanding, as the valves are closed, the only way the pressure can go, is down the cylinder. As it's going down, the piston is coming up......
That's why know I know what it is I'm getting on it! Any tips on timing at home? What degrees should it be? And is every engine different based on I'd and condition?
yes you can do things but you need some tools... maybe get an auto electrician or a mate to do this check for you... http://www.pexcom.com.au/z32cms/e107_plugins/content/content.php?content.221 and again take it to a mechanic or a mate or get a timing light. http://z32.wikispaces.com/Ignition+Timing http://www.pexcom.com.au/z32cms/e107_plugins/content/content.php?content.225 and interesting.. http://www.pexcom.com.au/z32cms/e107_plugins/content/content.php?content.226 and i prefer to use something like this between the N0 1 plug and the coil pack to get a better reading for the timing light. http://www.ebay.com.au/itm/Gunson-77074-Spark-Plug-Extension-Leads-Spark-Tester-/400320911839?pt=UK_Hand_Tools_Equipment&hash=item5d34fc59df
Pinging usually means you need higher octane fuel right? but in this pre detonation problem, would lower octane fuel be safer?
Thank you so much for that, I can easily do this stuff at home just need to buy a timing light. And that's great material you have found too, very clear!
If the det sensor was detecting pinging, the ecu will set for a lower octain setting. My engine is just a bit out of wack after many k's... I can still feel its very strong, but needs fine tuning
I've tried everything under the sun to rectify the issue - multiple plenum pull, vac leak tests, retarded timing below 15, serviced injectors, new fuel filter, new S2 PTU, new AFM and CAS and 98 fuel with octane booster each time I fill up and I still get the issue. It all started when my EGR was removed.
Whoops. Ignore my comment, because lower octane fuel has a shorter ignite to burn time, so it would make this WORSE.
If you have lower octane fuel, it will ignite sooner making the pinging worse. You need a higher octane fuel to prevent it
Yes l corrected myself. Low octane burns faster - high octane burns longer. I was suggesting 'safer' but that is wrong too. LOL, was l thinking of engines blowing up at the drags?:br:
Don't bother checking your timing, check the connection to the coolant temperature sensor first, if the connection is bad the ECU will think the engine is cold and run advanced timing for the warm up cycle = pinging. If you check the timing without checking the temp sensor plug first you will end up setting your timing retarded in relation to where it should be and the car will run like a sick dog. Been there, done that, have the t shirt, It's a two minute job to clean the connection at the CTS and then you can test drive and confirm, The above assumes a stock ECU, IF someone has put a custom tune in there then odds are it's a crap tune with a far to aggressive timing map = time for a retune possibly but check base timing before then.
Yeah I only ever run 98 in mine. So no issue there. I think what I was trying to say was a richer mix takes longer to burn so the ecu sets that. If it detects pinging
Kind of exposing myself here but I while back a had no temp reading lol so I went I'm the bay and noticed the temp sensor wire had broke on the inside of the connector... I decided to just solder the wire back on directly. Now seeing as though the wire was old and probably holding on by a few strands, it was probs always like this.... It had the classic green corrosion up the wire too! This is all sounding promissing! Ill takle the TPS volt check, re-set revs, and swap out both those sensors on the water line with new connectors and wires if problem persists ill do the timing
Cam I'll bring my test gear including a timing light along to the tech day this Weekend. I'll have a quick look for you.
