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OUT-OF-CONTROL FUEL DELIVERY
| 题名： | OUT-OF-CONTROL FUEL DELIVERY |
| 正文语种： | eng |
| 作者： | BRANDON STECKLER |
| 摘要： | Very similar to last month's theme, I was providing technical assistance for a drive-ability complaint for a GDI platform. The vehicle was a 2019 Honda Fit with a 1.5L engine. The original complaint was for the only exhibited symptom, a DTC P0172-"system rich." After viewing some basic scan data uploaded to ShopStream Connect from a Snap-on Zeus, it's clear to see that both the front and rear heated exhaust gas oxygen sensors (HEGOs) are telling the same story: the exhaust stream is oxygen-deficient (rich). With a measured lambda value of .925, the exhaust contents measure almost 9 percent too rich of the commanded stoichiometric Lambda value of 1.00 (Figure 1). As a result, the PCM is trying hard to regain control by negating total fuel trim by approximately 28 percent. So, as always, the question becomes "why?" Never leaving the driver's seat unless I need to is the secret to my success and efficiency. One can obtain many answers simply by asking the correct questions. Idling engines should breathe approximately 1.5 times their displacement (in liters), which is re- flected in grams per second (gps). |
| 出版年： | 2023 |
| 期刊名称： | Motor age |
| 卷： | 142 |
| 期： | 6 |
| 页码： | 46-47 |
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