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HELP! Wideband is reading lean at idle!!!


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I've got a 2004 R/C SRT10 Ram with a ROE camshaft and the Lysholm 3.3L/ROE supercharger ontop. at idle my ...



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Old 08-02-2014, 08:20 PM
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Arrow HELP! Wideband is reading lean at idle!!!

I've got a 2004 R/C SRT10 Ram with a ROE camshaft and the Lysholm 3.3L/ROE supercharger ontop.

at idle my wideband is reading 17+ and my intake pressure is around 4"....

As far as I can tell I don't have an intake leak. I've checked the resistance on all my injectors (16.6-16.8). My fuel pressure (at the rails) is 58psi. Not getting any misfire codes (yet...) but clearly misfires under boost.

I checked out my Short Term Fuel trims (bank 1&2) and the PCM is pulling fuel away...

I was thinking that I had vacuum leak somewhere but if I did the PCM would be adding fuel, not taking it away...

Any ideas? I'm stumped...
-Stupuff
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Old 08-03-2014, 05:08 AM
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Compression & leak down test time. You have un burned fuel going down the exhaust pipe.
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Old 08-03-2014, 09:50 AM
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17+ is LEAN.

Should be "hunting" between 14 and 15 at idle. Make sure O2's are functioning and have the mapping adjusted accordingly.
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Old 08-03-2014, 10:19 AM
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I would test the o2 sensor maybe clean it.
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Old 08-03-2014, 11:36 AM
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The o2 sensors are all new (all 4). I'm going to do a compression & leakdown test. I'll let you know what I find.

I've checked all the PCM inputs and they seem to check out (TPS, MAP, o2's, CT & IAT).
If my numbers are good on the compression test (fingers crossed) I'd be thinking computer next? I dunno... we'll see after the comp' test.
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Old 08-03-2014, 11:41 AM
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What brand wideband? What controller?
I've seen many that show lean at idle and I believe it's lack of airflow across wideband O2. If you barely give it gas does it bounce above and below 14.7 constantly? If so you're good bud. If you are showing boost at idle and PCM tune isn't adding fuel to compensate than I can see a lean idle.
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Old 08-03-2014, 02:07 PM
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Check your bypass valve at the rear of the Roe. You should not have boost at idle - if so your vacuum signal to the bypass valve is bad. If you do have boost at idle your fuel maps at the lower RPM is not setup (and probably shouldn't be) for the extra air and your trims can't adjust enough.
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Old 08-03-2014, 05:00 PM
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Quote:
Originally Posted by Stupuff View Post
I've got a 2004 R/C SRT10 Ram with a ROE camshaft and the Lysholm 3.3L/ROE supercharger ontop.

at idle my wideband is reading 17+ and my intake pressure is around 4"....

As far as I can tell I don't have an intake leak. I've checked the resistance on all my injectors (16.6-16.8). My fuel pressure (at the rails) is 58psi. Not getting any misfire codes (yet...) but clearly misfires under boost.

I checked out my Short Term Fuel trims (bank 1&2) and the PCM is pulling fuel away...

I was thinking that I had vacuum leak somewhere but if I did the PCM would be adding fuel, not taking it away...

Any ideas? I'm stumped...
-Stupuff
check the coupler on the rear of the roe, but it will hunt at idle regardless the brand, only time to really read the air /fuel is at wot
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Old 08-03-2014, 05:58 PM
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its an AEM wideband and a VEC3 controlling fuel

*fyi: I bought this truck with everything it has except the competition coupe cam. I had to get the cylinder heads re-done because I had installed e3 spark plugs and the cages blew apart and stretched some valves.... SPI in Oakville Ontario redid the heads put it back together and claimed it had 698hp at the wheels on the dyno. Except its never ran properly since...

I had made complaints to SPI about the drivability and they said "I must have done something". Typical... That rebuild was NOT cheap. I paid in full and since then I've had to replace my clutch and supercharger snout ass because of some really harsh misfires...

At the moment its together after having the supercharger snout rebuilt and its currently "running". That's all the info I can give you guys at the moment. Thanks a lot for any and all input. I'm literally trying everything suggested.

THANKS AGAIN GUYS!
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*****2004 SRT10 RAM reg cab. ROE supercharged. meth injected. and a lumpy ROE camshaft. 698hp on 91octane*****
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Old 08-03-2014, 07:33 PM
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Just did a compression test on all cylinders they are all close to 150psi.

Will try to post a video of it running soon.
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-Stupuff

"BOOM, HEADSHOT"

*****2004 SRT10 RAM reg cab. ROE supercharged. meth injected. and a lumpy ROE camshaft. 698hp on 91octane*****
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