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Didn't think to read the plugs, I'll double check that.
Posted by: hydrochloric (84761) on 2016-02-01 15:44:30 In Reply to: Can you tell from the colour of the tip area of the plug which one(s) is/are not firing well? If so posted by UrS4boy on 2016-02-01 15:27:51	Share \| Report

I did use one of those spark testers, and as best I could tell under idle, the coils are all exceedingly strong, and the wires are new from EFI.

Also don't think there's anyone local to me on the US side of the border. In a few weeks I'll get my passport and can go across to try swapping parts.

Thread:

New ECU, still can't get past 6k. - hydrochloric 2016-02-01 15:18:16 (384 views)
- Any codes on this ECU? - scarman 2016-02-02 14:07:51 (195 views)
  - Oddly, I just checked, and well... - hydrochloric 2016-02-02 17:46:34 (243 views)
    - Backwards? I'm not sure I understand. Duo you mean to the white plug? Since you don't plug - scarman 2016-02-02 19:32:38 (199 views)
      - The black diagnostic plug in the under-cowl box is shaped to only allow a plug on it in one  -  hydrochloric  2016-02-02 19:42:51 (224 views)
        
        I have killed a cheap cable by plugging the adapter in backwards before.  -  Mike Atkisson  2016-02-03 17:53:01 (188 views)
        
        Dammit, I'll try the old ECU to verify it's not the chipped one... Then buy a cable again.   -  hydrochloric  2016-02-03 21:12:06 (193 views)
    - Check your injector wiring. It could be failing/failed - UrS4boy 2016-02-02 19:25:30 (205 views)
      - I'll give it a check, but why would a different ECU cause the code to magically appear? - hydrochloric 2016-02-02 19:48:14 (183 views)
    - 4412 and more - UrS4boy 2016-02-02 19:06:57 (243 views)
- Remind us of the full story...cam sensor and crank sensors repaired, and you verified the tab on the - The Scrambler 2016-02-01 21:46:16 (258 views)
  - Correct. G4, G40, G28 all replaced, G28 & 4 swapped a few times. - hydrochloric 2016-02-01 22:26:51 (308 views)
    - Have you checked engine and ECU grounds? is it a stock flywheel or aftermarket/ - The Scrambler 2016-02-02 07:34:23 (236 views)
      - I've checked (and cleaned) all the engine grounds I can find.  -  hydrochloric  2016-02-02 11:04:49 (223 views)
        
        The ECU grounds to the intake manifold. The coils ground to the cam cover.   -  UrS4boy  2016-02-02 11:27:07 (229 views)
        
        The coil ground has been reseated a few times, due to fighting the seal.  -  hydrochloric  2016-02-02 16:15:59 (309 views)
        
        ECU grounds to the intake manifold, drivers side, rear(ish)   -  UrS4boy  2016-02-02 19:08:04 (199 views)
        
        Have you tried grounding the cam cover to the firewall? Just as a temp. check to make sure  -  The Scrambler  2016-02-02 11:16:49 (243 views)
        
        I haven't tried that, I can do that too. I do expect it to be signal issues, at this point.  -  hydrochloric  2016-02-02 16:14:59 (217 views)
- What does it do at 6K? Just flatten out??? Fuel starvation or valve float? - mtg 2016-02-01 20:16:35 (249 views)
  - It starts popping and banging, much like launch control. Not gentle at all. - hydrochloric 2016-02-02 01:25:08 (257 views)
    - Have you checked the accuracy of the tach to make sure you're not just hitting the ECU's rev limit? - doron 2016-02-02 14:32:58 (202 views)
      - Yes, VAGCOM matches the tach and both go crazy at that point. - hydrochloric 2016-02-02 16:13:38 (214 views)
- Can you tell from the colour of the tip area of the plug which one(s) is/are not firing well? If so - UrS4boy 2016-02-01 15:27:51 (331 views)
  - A 1.8t coil conversion harness is absolutely cake to make! and nearly free if you source it right! - The Scrambler 2016-02-02 10:36:17 (265 views)
    - I'm hearing this more and more, the LS coils just aren't as good. Still hits me as odd, but I guess - hydrochloric 2016-02-02 11:07:07 (214 views)
      - I've been using the AEM coils to replace the 034 LS1 coils...seem to work fine even at 10.5 AFR - oldjag 2016-02-02 20:06:36 (215 views)
        
        My old Subaru used LQ-style coils, those ran it at <10:1 when my tune was way out. - hydrochloric 2016-02-02 20:08:45 (180 views)
  - Didn't think to read the plugs, I'll double check that. - hydrochloric 2016-02-01 15:44:30 (336 views)
    - Reading the plugs is possible, but generally only when your shit is waaaay out (more inside) - The Scrambler 2016-02-03 16:47:00 (197 views)
      - Can't get VAGCOM to connect right now for some reason.  -  hydrochloric  2016-02-03 17:30:37 (209 views)
        
        there is an OBD fuse on b5 chassis cars in case someone plugs something sketchy in  -  The Scrambler  2016-02-03 22:51:18 (206 views)
        
        It's not labeled OBD, it's labeled "Diagnostic", S19 in the fuse panel.  -  hydrochloric  2016-02-04 00:37:35 (199 views)
        
        Aaaaand it's fine. ECU or cable, then.   -  hydrochloric  2016-02-04 14:01:51 (175 views)
- Oh, on the plus side, I did get the PCV issues fixed, even at the higher boost. - hydrochloric 2016-02-01 15:21:44 (305 views)
  - Get a scope on the flywheel pickups...tach bounce w/misfire might point to pickup or connector - oldjag 2016-02-02 20:37:47 (218 views)
    - Yes, it's exclusively dependent on RPM. When I get a chance to prod the wires for a signal, I will. - hydrochloric 2016-02-02 20:59:34 (184 views)
  - How? - Razorthirty 2016-02-02 19:48:50 (209 views)
    - Replaced the broken oil fill cap and re-RTV'd the valve cover gasket. No leaks now, even under - hydrochloric 2016-02-02 20:09:55 (219 views)

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