SherpaPilot
Jedi Hopeful
Offline
I have a 72 TR6 with the original Stromberg carburetors. Recently I experienced a popping noise during acceleration from the forward carburetor. The first thing I did was to pull the plugs. All the spark plugs looked like normal clean burning with the exception of #1 which was burned and had lots of carbon deposits. I installed fresh plugs, new distributor cap and new plug wires just to be certain the ignition system was working properly. The distributor was retrofitted with the Petronix electronic module a few years ago. I set the timing IAW the manual (4 degrees ATDC) at 850 RPM. The test drive showed no improvement thus the ignition system was ruled out. I cleaned both (K and N) carburetor air filters. The piston lift test showed me both carburetors were too lean as the engine wanted to quit as the piston was slightly lifted on each carb. Both diaphrams were checked and found to be without air leaks. I attempted to adjust the carbs to acquire a normal piston lift test without success. Both carbs would not get any richer no matter what I did. This makes no sense to me. Why would only #1 plug be abnormal and the other 5 normal. Why would the carburetors be unable to provide a suitable test as outlined in several manuals? I checked for manifold leaks and found nothing out of place. Could I have an engine valve problem with both Strombergs failing all at the same time? Am I the only guy this has ever happened to? Is there life on other planets? Ahhhh, questions and more questions keep popping up.