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CHANGED EVERYtHING but still misses 

 

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 Post subject: CHANGED EVERYtHING but still misses
Posted: Fri Aug 31, 2007 1:58 am 
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G'day she's a eb II with a stage one cam, HUGE k&N pod, cold air induction, genie extractors, 2.5" straight through with one mufferler (no cat) 3.7:1 diff, T5, AND A BLOODY idle thats all over the place, if you rev her in neutral she misses, slight miss while cruiseing, deaccelerates like a pig i.e. Shudders, but when you floor her it goes like the clappers with no miss or hesitation at all?
I have changed every sensor: oxy, act, map, coolant temp, thottle pos, new dissy & new coil which i soon ditched for a msd 6al with a blaster 2 (made bugger all differance) new leads and plugs, new fuel pump & filter + fuel regulator, no vacume leaks, reco injectors which still don't fire right so i rewired them (still no change) the idle speed control works fine and is clean, i have gone through three ecu's thinking that might be it... nope, put wd40 on all my plugs (EVERY ONE) and cleaned them... nuh! its got me stuffed?
btw when i check the falt codes the only ones that come up are for the auto trans (doesn't have one anymore :D ).
When i put the timing light on her the ignition timing is jumping around a fair bit about maybe 6deg ive tried all differant settings but no change to the problem and the spark is sometimes intermittant.
CAN SOME ONE HELP ME PLEASE! i love this car but she has cost me thousands over the last 7 or so years!!! and im at wits end.
thank you.

 

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Posted: Fri Aug 31, 2007 2:03 am 
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first thing that should be on your list: get a catalytic convertor.

 

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Posted: Fri Aug 31, 2007 2:04 am 
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I was just hunting for better flow / less restriction.

 

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Posted: Fri Aug 31, 2007 2:05 am 
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Quote:
reco injectors which still don't fire right so i rewired them (still no change)

ummmmmm....could that be it?

 

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Posted: Fri Aug 31, 2007 2:07 am 
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they just didn't tick evenly i thourght it might have a short in the loom so i rewired it?

 

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Posted: Fri Aug 31, 2007 2:15 am 
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It's got intermittent spark under no load, yet it doesnt miss under load?
You say it comes up with fault codes for the auto trans, what gear have you got the ECU tricked to be in?
When you did the dizzy did you get new TFI?

Ignition timing will jump around if the car isn't in diagnostic mode, its impossible to set base timing properly if it isn't.

 

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Posted: Fri Aug 31, 2007 2:21 am 
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yeah but compaired to a standard car the timming jumps around alot, when the idle drops the spark stops the timing advances the idle comes back up, and it just repeats the cyle over and over. the dissy was a complete new unit tfi and all. and thats the confuseing bit... no miss underload, big miss no/little load?

 

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Posted: Fri Aug 31, 2007 2:24 am 
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btw didnt trick the ecu into anything, just wired up the speedo, reverse and inhibitor. but it was doing it when it was an auto anyway.

 

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Posted: Fri Aug 31, 2007 8:58 am 
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When I had a similar problem in the EF, erratic timing, poor idle with a miss under no/low load, I pulled everything relating to ignition, just as you. Turns out I had a bad intake gasket with a crack near the bolt on #6. You could spray wd40 around and you wouldn't detect it, but it was there. Fixed that and it idles smooth as silk.

cheers
Scott

 

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Posted: Fri Aug 31, 2007 9:57 am 
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have you checked all the earth wires in the ignition system?

and does RPM at idle stay static? or is it all over the shop

 

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Posted: Fri Aug 31, 2007 11:16 am 
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i have the same prob with my ef a drop out under no load and its driving me crazy to but all gaskets have been replaced n stuff and still cand get rid of it but it comes and goes its not there all the time

 

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Posted: Fri Aug 31, 2007 8:43 pm 
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could also relate to an iduction fault , you say ya got a massive k &n filter , try a standard air box and filter on it and see if that help as i notice irratic sorta idle with my medium pod setup just not bad enuff for it to miss

 

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Posted: Fri Aug 31, 2007 10:47 pm 
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have u tried disconnecting the isc?
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Posted: Fri Aug 31, 2007 10:52 pm 
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Mitch_ wrote:
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reco injectors which still don't fire right so i rewired them (still no change)

ummmmmm....could that be it?


hmmm i would say so...........

if not Idle Speed Controler f**k or something with ya spark

 

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Posted: Fri Aug 31, 2007 11:07 pm 
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yeah check and clean your idle motor if that doesn't work there's a good chance you've got a leak in the intake side somewhere, (i had this prob when some d*ckhead put a too longer screw on my intake mount through the manifold)

 

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