[s-cars] ur-S4 high load misfire

[Richard Hoffman]

Try a smaller plug gap.  You might just be "blowing out the fire".

Richard


----- Original Message ----- 
From: <cody at 5000tq.com>
To: <s-car-list at audifans.com>
Sent: Friday, December 15, 2006 11:29 AM
Subject: [s-cars] ur-S4 high load misfire


> Ok I've just finished up a MRC RS2 software/injector + GT2871 setup on  
> my boss/friends '93. Had some issues with the kit, some big some  
> small, but now I'm down to one final issue.
> 
> We have a high boost miss. Car runs perfect in all other situations.  
> Plugs look good, has the F5PDOR plugs in it. All plugs look the same,  
> ie I can't pin it to a cylinder based on the plugs. It definately  
> feels like only 1 cylinder is dropping, sometimes it's just an  
> intermittent thing, sometimes it will completely drop a cylinder until  
> you lift off. I just changed the coil boots as one showed high  
> resistance, no change at all. Didn't seem to have this issue before,  
> but of course the problem only seems to occur at boost levels higher  
> then stock anyways.
> 
> Any suggestions as to pinning this down? There is another ur-S4 in  
> town that I'd like to borrow the coil set off of, but unfortunately it  
> wasn't availible today. Wylie, maybe we can work something out for  
> Monday? If it works better I'd drop by and swap them one evening then  
> bring yours back the following evening.
> 
> I thought about buying one coil ($120!!) and trying it on different  
> cylinders, but that would be a PITA with them needing to be hard wired  
> in.
> 
> -Cody Forbes
> http://www.5000tq.com
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