| New Bosch III install; maybe it didn't go so well. |
Subject: New Bosch III install; maybe it didn't go so well. by screamin_conure on 2010/3/28 16:08:13 Greetings all, I recently installed a set of #22 Bosch III injectors from FIC in my 1992 Corvette LT1/A4. The installation seemed to go fairly well, however, I think I may have missed something. The reason I decided to install new injectors was to correct a very high right bank BLM reading, as well as a poor quality idle (sometimes too high, sometimes too low, and always "bouncy"). Prior to installing the Bosch IIIs, my AutoXray scan tool told me my right bank BLM was pegged at 160 at idle, while my left bank was around 130 at idle. The car recently had new 02 sensors and a new fuel filter installed, and when driving the car home from the shop after this work was done, my BLM readings were still the same as before. I installed the Bosch units a couple of days later, and while the car seems to run better (noticeably more power under hard acceleration and a slightly smoother idle), it still continues to alternate between idling slightly too high (700-800 RPMs) and too low (400-450 RPMs) in around-town driving. With the new injectors, my right BLM is bang on now at 128 at idle, but now my left is at 140 at idle. My IAC counts are all over the place too, often times dropping to 0 at idle telling me the ECM is trying to compensate for false air somewhere else. During the injector install, I wasn't sure at first, at what point the injectors were considered properly seated. The first injector I tried to install was for the #1 cylinder, on the left bank. I used liquid hand soap to liberally lubricate the o-rings prior to seating. I pushed the injector in, rocking it gently from side to side, and when it wouldn't go in any further, I continued applying pressure and rocking, thinking that it had to go in furhter. I removed it, re-lubed it, and tried again, rocking the injector from side to side and applying pressure. After several minutes of playing with this, it finally occurred to me that that was as far as the injector was supposed to go. I went ahead and finished installing all of the remaining injectors, applying more soap to the top o-rings prior to seating the fuel rails. I could feel the fuel rails "snap" into place over the injectors, and I torqued the fuel rail bolts down to the specs from my factory service manual with a good quality torque wrench. I then primed the system by turning the ignition on and allowing the fuel pump to run and shutting it off. After priming several times, I checked for fuel leaks around the injectors. None found. I went ahead and started the car. It took a bit of cranking the first time, but eventually fired. Once again, no fuel leaks. I've put about 100 miles or so on the new inectors, and as I mentioned, the car seems to run well except for the Jekyl and Hyde idle situation. I really think I may have a slight leak around one or more of my injector o-rings on the left bank that is causing one or more cylinders to somewhere, somehow, draw in additional air and cause the 140 BLM (lean, requesting fuel). So now my question is, is there anything that I can do without having to remove the fuel rails to detect and possibly correct the leak? And if I do need to remove the fuel rails, will it be mandatory to replace all of the o-rings at that point? Any suggestions would be sincerely appreciated. Regards, Ron |
