View Single Post
Old 08-26-2002, 11:55 AM
Posts: n/a
Unhappy 1973 450 SEL injectors not clicking

Hey all~

Yesterday, I removed the Bosch Platinum plugs and when examining them, I found that they showed signs of cylinders running too hot. I replaced the plugs with Bosch Copper core plugs.

I drove 2 miles and suddenly I get this loping feel. So bad that it sounds like maybe more than one cylinder is misfiring! I could barely make it up a hill, I pulled over, revved it: *poof* loud bang and a plume of black smoke out my exhaust, then it ran okay and I drove it one more block when it started again and I parked it.

I remove the plugs. They are covered with black soot. Some plugs are slightly moist. I start the car and it lopes like a misfire. I check all the cylinders and make sure the are getting a spark from the distributor, I re-gap the points, and I check the wires with a dwell meter to make sure there's voltage in the wire. Everytime the engine loped the voltage would drop off (probably fom the lope). I also checked the vacuum advance and it works fine. Othr vacuum hoses seem to maintain proper pressure. I put a stethoscope to the injectors. Sure enough 3 of my 8 cylinders injectors aren't clicking. I messed with the Emmisions Control Unit (ECU) earlier to make the misture a wee bit richer or leaner because the MB tech told me it may be running hot from a lean mixture. 1-800-222-0100 option 7 and asked to speak to a tech.

This has happened before to me but this has been the worst case. Before I simply drove out of it but now its time to fix it. I wonder what is causing this? I still have to try attaching a noid light to the connectors. Is my ECU bad? Is there a vacuum leak I wasn't aware of? Is there a broken wire or controller? A sensor?

Funny enough, I backed it out of my driveway feeling hopeless and sure enough it was running fine again. 2 hours of hell and now it ran okay! I didn't want to chance it though so I parked it, ran to my computer and here we are.

Ideas on this or my overheating problem? 1973 450 SEL running hot at high speed

Thanks for any input!
Reply With Quote