Join Date: Dec 2003
Location: Carson City, NV Class Champion Reno SCCA 2018
Black soot at tailpipe?
I've experienced about every possible issue imaginable with my engine, but none included black soot from the tailpipe and frankly, don't believe I've seen it reported as a symptom here...ever.
When was the last time the engine ran properly and what, if anything may have been done in the interim to change the situation?
It would be of interest to know if the problem is shared by all cylinders. I have an inexpensive IR, hand-held temperature sensor from HF (with laser pointer!) and by aiming it at each exhaust header I was able to determine, when the engine was running poorly, that all the headers were of equal temp. If nothing else, I was confident the problem did not lie in any particular cylinder. Turned out to be a loose connection on the coolant temperature sensor. The spring retainer was missing.
May I presume that while the engine idles (such as it does) you have performed the "wiggle" test of all electrical and air connections?
Also, a bit of ether (starting fluid) sprayed around the various plumbing connections should result in a noticeable change if there is a leak. As others have noted, air leaks are the Achilles Heel of LJets.
Still puzzled by the soot, since that would obviously indicate unburned fuel from a mis-firing cylinder(s) or more fuel being injected than the cylinders can handle with available air. When does the soot present?
Finally, regarding the distributor, I believe it is simply a rotating switch and ignition is triggered by the (wait for it) ignition ECU.
Finally, finally, take a few minutes to fill in your details via User CP. Saves a lot of questions.
Steve Waclo Carson City, NV; '87 Spider QV, ES Champion, 2018 Reno SCCA (125k);'93 Honda Nighthawk 750 (105k);'03 GMC Sierra SLE 2500HD Turbo Diesel (155k);'08 Altima Coupe 3.5SE, 6sp (125k)