Quote:
Originally Posted by Franke
Vettetech1, Have all the fuel injectors been replaced? Especially the primaries. As Paul says above, they need to be checked while hot. They will read between 12 and 13 ohms cold but lower than that when hot. My car had 4 bad injectors on the secondaries and 1 on the primaries. My symptoms were.. stable idle in open loop then miss fire and sag when in closed loop. Of course closed loop is when the engine temp is up and the O2's are providing feedback to the ECM. So when the injectors started to fail I could see this using TTS datamaster and laptop as the fuel trim went nuts. Something else I had was excessive clutch noise in neutral due to the slight missfire. That all cleared up when I replaced all 16 injectors.
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Over the past 3 years all 16 injectors have been replaced. It came in a few weeks ago running like crap after it was warmed up in power mode. Found 2 bad secondary injectors. After looking at his repair history i noticed there were only 2 more injectors after that were OE. So i suggested we do the last 4 injectors so we wouldn't go through this next year. After doing the injectors it ran great on the test drive. No hesitation or anything. Owner picked up the car a few weeks later and boom running like crap again. Tested injectors both hot and cold are around 12 ohms.