zuhow Posted February 4 Share Posted February 4 I'm just getting this beast on the road, and I can't seem to figure out this issue. After a while, say maybe 15-20 minutes of warm up, my car starts to read full lean. I can add fuel to the point it wants to stall, and that sensor still reads lean. Starting from cold it behaves as expected, but at some point that stops. Do you think it's a leak in the intake or exhaust that open up at operating temp? I've looked for both, but haven't had any luck. Do you think it's just that AEM controller is junk? I'm at a loss, any direction would be appreciated. Quote Link to comment Share on other sites More sharing options...
jonbill Posted Wednesday at 04:17 PM Share Posted Wednesday at 04:17 PM Sounds like a duff sensor. Quote Link to comment Share on other sites More sharing options...
Brad-ManQ45 Posted Wednesday at 05:09 PM Share Posted Wednesday at 05:09 PM You ask a question without telling us what equipment you are running and expect an answer? Quote Link to comment Share on other sites More sharing options...
zuhow Posted Wednesday at 07:35 PM Author Share Posted Wednesday at 07:35 PM Forgive me gentlemen, frustration posting. I was looking for a more general cause. I have an electromotive tecGT on a turbo application. I've checked the sensor and it will read rich or lean as appropriate in free air or a gas soaked rag. It's a new sensor. It's maybe had a half dozen hours of run time at idle to 2500rpm. I've just gotten the engine started and I'm now trying to get to a point where I'm able to take it for it's initial drive. I've had a little bit trouble getting a decent base map using the tuning wizard. I've been following the Clewett tuning instructions as a guide. So what seems to happen is I bring it up to 2500rpm and get the AFR to 14ish, then bring to idle and try to adjust there. Everything will be looking fine. But eventually the AFR meter will drift off to full lean. The car is loud, so I'm not hearing an exhaust leak, but that doesn't mean it's not there. Quote Link to comment Share on other sites More sharing options...
jonbill Posted Wednesday at 08:08 PM Share Posted Wednesday at 08:08 PM What sensor and wb controller is it? Quote Link to comment Share on other sites More sharing options...
Brad-ManQ45 Posted Wednesday at 10:07 PM Share Posted Wednesday at 10:07 PM Getting enough info is like pulling teeth for some reason... Quote Link to comment Share on other sites More sharing options...
calZ Posted Thursday at 04:51 AM Share Posted Thursday at 04:51 AM Is the auto-tune function on? It's possible that the ECU is trying to correct something and is doing a poor job of it. Quote Link to comment Share on other sites More sharing options...
zuhow Posted Thursday at 10:52 AM Author Share Posted Thursday at 10:52 AM It's an AEM 30-4110 with the bosch LSU sensor. No, the auto tune is not on. If there is some specific info you would like, please ask. I know you to be extremely knowledgeable, I would gladly welcome your help most appreciatively. But if you just want to be a d*ck, I'd prefer you just ignore this thread, thanks. Quote Link to comment Share on other sites More sharing options...
jonbill Posted Thursday at 12:56 PM Share Posted Thursday at 12:56 PM What kind of a car and engine is "this beast"? If you're idling an l6 in an s30 with an unvented bonnet and no heat shielding on the exhaust, the injectors may well be heat soaked. But then again, if as you say you can add fuel until it stumbles and it still reads lean, then it sounds like a duff sensor or an air leak in the exhaust. Is it a genuine Bosch LSU4.9? Where did you buy it? Quote Link to comment Share on other sites More sharing options...
Brad-ManQ45 Posted Friday at 05:33 PM Share Posted Friday at 05:33 PM zuhow: It appears that you think I'm being a DICK for having to point out TWICE that you failed to provide needed information. I think you'd better look at yourself in the mirror wearing your big boy pants. Quote Link to comment Share on other sites More sharing options...
jhm Posted Friday at 07:28 PM Share Posted Friday at 07:28 PM Hey guys....not pointing any fingers, but I would like to remind everyone to keep the discussion civil per our Forum Rules (#12 & 13, specifically). We're all on the same team here. Thanks very much. Quote Link to comment Share on other sites More sharing options...
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