Quote:
Originally Posted by NWPzr1
I installed 16 rebuilt FIC injectors on the 90zr1, and everything seems to be good so far.... It only has 10k miles, I threw some Lucas fuel system cleaner in the tank and trying to put some miles on the car. Although, I did get on it a few times up to 6-7k rpm and it seemed to run a bit rough after that in the lower rpm's for 10 min or so before I shut the car off. Then I went to start it up 2hrs later and it cranked for about 5 seconds before it fired and smelled like raw fuel for a few seconds. I've put some miles on it since then, but no problems have persisted. Thoughts?
|
Asking for guesses? Hmmmm.... I'm gonna guess one or more injectors is or was leaking. A fuel pressure leak-down test would be SOP for any new injectors. In fact, test can be done, and the injectors can be visually inspected
before the plenum is reinstalled by hooking up the fuel rail and turn the ignition switch to ON and inspecting the injectors by looking down in the IH runners. Any fuel spraying or dripping, etc and you have your culprit/s. (I suppose you could poke a paper towel down below the injector nozzles to see if there is any seeping going on.) Then turn the switch off while monitoring fuel pressure at the Schrader (sp?) valve. It should hold to within a pound or two for 3-5 minutes w/o signs of leaking (dripping). I've done this before, and trust me, it is a lot easier to do than pulling the plenum to find a runner full of fuel, or hydra-locking a cylinder...
Just something to keep in the back of your mind, if there is no fuel leaking from the injectors, yet the leak down test is failing, I had a bad check valve in a newly installed fuel pump cause issues. My point being, testing the injectors before installing the plenum has many advantages, and you don't have to pull the plenum off (cuz it was not yet installed) to troubleshoot. Just a thought.
And, another thing...if that "injector cleaner" loosens something between the fuel filter and the injectors, where is it going to go? Any fuel system (including the fuel rails) cleaning would be best done
before the injectors were reinstalled, and by a more positive/aggressive method than a passive fuel additive, IMO. Flushing the lines and replacing the filter(s) before installing the injectors...would be what I would prefer to do (but that's just me).
P.