Honda Accord Code Misfire On Acceleration

Honda Accord Code Misfire On Acceleration Amazon Printed Books http://www.amazon.com/gp/search/ref=sr_nr_p_n_feature_browse-b_mrr_0?rh=n%3A283155%2Ck%3Astories+from+the+road%5Cc+mandy+concepcion%2Cp_n_feature_browse-bin%3A2656022011&bbn=283155&keywords=stories+from+the+road%2C+mandy+concepcion&ie=UTF8&qid=1360007005&rnid=618072011 Amazon Kindle Edition http://www.amazon.com/s/ref=sr_nr_p_n_feature_browse-b_mrr_1?rh=n%3A283155%2Ck%3Astories+from+the+road%5Cc+mandy+concepcion%2Cp_n_feature_browse-bin%3A618073011&bbn=283155&keywords=stories+from+the+road%2C+mandy+concepcion&ie=UTF8&qid=1360007050&rnid=618072011 Android APPs https://play.google.com/store/search?q=stories+from+the+Road%2C+mandy+concepcion&c=apps Robo Tech was called to a shop on a 1997 Honda Accord, with a 1.8 liter, F18A engine. The car had misfiring cylinders upon acceleration. It also had codes P0300, or general misfire code, and codes P0304 and P0302, or misfire on cylinders 2 and 4. The shop performed a tune up, due to old and worn out ignition components. They also cleaned the throttle body, and replaced the oil. These were general repairs that the vehicle did need. Nevertheless, the vehicle was still the same. Finally, the shop opted to replace the ignition coil, but to no avail. It was then that the shop decided to call me in for assistance. When I got to the shop, I spoke to the tech that worked on the car. He said that the vehicle was running rich when the misfire was happening. I asked why he thought that, and he said that fuel trims went high during the misfire. So, I started my diagnostic by doing a code and DataStream analysis. I retrieved codes P0300, P0302 and P0304, in line with what the shop told me. I also got a P0172, or System too Rich (Bank 1). Well, rich conditions are rarer, so I opted to continue and do a fuel trim analysis. I graphed the fuel trims and saw that at idle and higher RPM, the fuel trims were perfect, but, during a loaded condition the fuel trims went high in the negative numbers. That meant that the ECM was reducing fuel injection pulse, due to a rich condition. But rich condition from where? And why was the rich condition only on a loaded engine? I could only think of one reason, a leaky injector! That had to be the cause, but, I needed to prove it! This injector had to have an internal issue, that only acted up during a wide pulse condition, because at idle it was fine. The only way to prove the injector was to do a leak down test, using an injector pulser. This is done with the engine off, by pressurizing the fuel rail, connecting a fuel pressure gauge, and pulsing the injector for a pre-determine amount of time. As I did the test, I saw no difference in drop between all 4 injectors. I knew that as little as a 2 PSI difference was enough to cause problems. The leaky injector should have dropped lower on the gauge, when pulsing at a long pulse width. This issue was not a leaky injector! But wait a minute, what could it possibly be t