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| Deceleration AFR http://www.ladsm.com/forum/viewtopic.php?f=26&t=13337 |
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| Author: | turboawdfanatic [ Fri Sep 30, 2011 2:27 pm ] |
| Post subject: | Deceleration AFR |
Ever since I installed a wideband I've observed that my AFR goes full lean whenever I let off on the gas pedal and am under engine deceleration. All of a sudden starting yesterday, my AFR goes rich instead of lean on deceleration. I'll be cruising at 14.7AFR and when I let off it will hover around 12-13.5AFR. Any idea what's up here? Leaking injector? I checked my fuel pressure gauge about 5 minutes after shutting off the car and it was still holding pressure. Also, I noticed the car has been running a bit rich during cruise, but this might be b/c I fixed some exhaust leaks recently. I didn't notice the deceleration issue 'till a few days after fixing the exhaust leaks, so not sure if they're related. Thoughts? |
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| Author: | turboawdfanatic [ Fri Sep 30, 2011 2:31 pm ] |
| Post subject: | Re: Deceleration AFR |
DERP, I might have already figured out my problem. I was messing with throttle stop and TPS a while back and currently have the TPS mis-adjusted. I think it reads around 13% when I let off rather than the usual 10%. This is probably keeping the engine from cutting fuel during decel. I'll respond with results after I check it. Any thoughts on any other factors that might be causing this? |
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| Author: | Illeagle [ Fri Sep 30, 2011 3:57 pm ] |
| Post subject: | Re: Deceleration AFR |
Sounds like a culprit. The ecu has a TPS threshhold before engaging DFCO. |
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| Author: | turboawdfanatic [ Fri Sep 30, 2011 6:41 pm ] |
| Post subject: | Re: Deceleration AFR |
Yup it was. TPS was reading 3% on Zeitronix (Zeitronix actually shows 0% like it should, not 10% like other loggers), so I adjusted it and *bam*, back to normal. Strange how I only noticed it yesterday. Last time I messed w/ the throttle stop was a few weeks ago. LOL serves me right for starting a thread before thinking about it for 30 seconds. Meh, maybe this info will help someone else out someday... |
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| Author: | -red97rum- [ Sat Oct 01, 2011 10:46 am ] |
| Post subject: | Re: Deceleration AFR |
This happened to me once when I was replacing the fuel filter. I broke the wire to the closed throttle switch on the back of the throttle body. The ecu cuts fuel on decel at any rpm above 1200 I think it is, I'm sure you knew that already. |
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