4K QUATTRO IDLE PROBLEM AFTER INJECTOR OVERHAUL

[mark wolfson]

I recently went to an independent shop in the area that flushed my injectors, replaced two injectors and all injector seat seals. Car runs much better, as one injector was squirting, not spraying. However, now, the car idles low, and when the car is warmed up, when I let off the accelerator (while driving), the idle dips to about 5-600rpm, which causes stumbling to the point of almost stalling. Then it immediately spikes back up again to normal (if you call it normal). Also, then at startup when car is warm, I get full crank hard start, then it catches and dips again to almost stalling level, then spikes back up to 800rpm, but runs a bit lumpy, low. I went back to the repair shop. They looked at it, and stated that a vacum tube got soft and buckled against something that cut off the air. So they took off the rubber tube and put a spring in it to prevent it from collapsing. It seemed to work for awhile, but that is not the problem. Before they found this, the tech told me that since there was less air getting in the system because now the injector seals were tighter, the idle might be lower. He said the idle is self-adjusting. The car seems to start cold ok. What is the problem? I would guess fuel pressure, but the car otherwise runs stronger now that the injectors were cleaned/replaced. Any suggestions?