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Top 2GNT Technical Performance/Engine Engine Management Systems & Controllers topic #3605
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Subject: "odd behaviour at 3000rpm" Previous topic | Next topic
ivan300Feb-02-08 02:57 PM
Member since Dec 15th 2006
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#3605, "odd behaviour at 3000rpm"
Feb-02-08 04:58 PM by ivan300

          

hmmm never mind looks like im getting rpm spikes

Status: Sleeping, MS upgrades/rewiring.
99 Eclipse GS(with Turbo),Turbonetics 60-1 0.63a/r, MS II v3, 3" Turbo back exhaust, GSX Brakes, Wiseco 8.8:1 Pistons, Eagle Rods, Crane 14s, SS Valves, Felpro Gasket Kit, Obx Lsd, Southbend Fe Clutch, Ebay Short Shifter, Pioneer Avic-N3, 12" Alpine Type-R

  

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ModeratorbullettdsmFeb-03-08 01:44 AM
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#3606, "RE: odd behaviour at 3000rpm"
In response to Reply # 0


          

Seperate and check grounds?

MB

Captain Caveman

96 RS Turbo 11.414 @ 119.62 MSNS, Crower 2 NA cams, BW366, 10.5 comp, UDP, 60mm TB, W/A intercooler, 3.55 tranny 567.9whp 430tq
97 RS NA 13.188 @ 103.87 MSnS powered 12.5 comp, Crower 3's and 219.4whp with 175tq
98 RS DD 12.5 comp on stock ECU, LTH, Crower 2's, Koni, GC, Hypercoil, DG hats
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99 GS stocker auto 17.7@77mph!

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ivan300Feb-03-08 10:46 AM
Member since Dec 15th 2006
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#3608, "RE: odd behaviour at 3000rpm"
In response to Reply # 1
Feb-03-08 11:21 AM by ivan300

          

alright so i fixed the rpm spikes according to the stickied thread, that fixed the spike issue, however i still go lean around 3k no matter how much fuel i put in and it makes the engine studder and backfire, only at 3k and around 100kpa

ms 1 v3
accel 880cc inj
innovative lc-1


heres the msq
http://ivan300.tripod.com/feb_3_not_working.rar

this is a second gear pull up a slight hill

Status: Sleeping, MS upgrades/rewiring.
99 Eclipse GS(with Turbo),Turbonetics 60-1 0.63a/r, MS II v3, 3" Turbo back exhaust, GSX Brakes, Wiseco 8.8:1 Pistons, Eagle Rods, Crane 14s, SS Valves, Felpro Gasket Kit, Obx Lsd, Southbend Fe Clutch, Ebay Short Shifter, Pioneer Avic-N3, 12" Alpine Type-R

  

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WickedESiFeb-28-08 11:18 PM
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#3633, "RE: odd behaviour at 3000rpm"
In response to Reply # 2




          

It's definitely misfiring at that range, and I'd say it's not lean, but possibly too rich given the size of those injectors and your pulse width at that range.

Remember ANY type of misfire (other than EGR malfunction) will read a high oxygen content aka lean AFR.

It may also be ignition related, around 3000 rpm is when the ignition will be most stressed, inspect the plugs, try gapping them to .020" temporarily to see if it improves at this rpm range to isolate an ignition related problem.

How did you fix your spikes? Still a possibly ground issue.


Joel Baldridge, ASE Certified Master Technician, Audi Certified Expert Technician

  

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