Posted November 7, 201113 yr comment_371164 The 77 smells like it is running rich and the spark plugs tell me the same. I get a backfire and stumble pulling away from a stop under partial load at low revs. That being said I seem to be getting the same problems others have had I found searching similar posts about EFI problems; and all those seem to indicate air bypassing the AFM or the coolant temp sensor; and others indicate a lean condition with that. My boot seems to be in good shape. What kind of tests can I run on that sensor to check that? Any other suggestions? I want my pile running as good as this pile will run for my trip to Fredericksburg next month. After this trip I am going to pull my Turbo motor from the parts car, have the head refreshed and put that in the 77 anyhow. Link to comment https://www.classiczcars.com/forums/topic/41269-stumble-and-back-fire/ Share on other sites More sharing options...
November 8, 201113 yr comment_371188 Running rich sounds like a coolant temp sensor. Use test procedure in fsm to check Link to comment https://www.classiczcars.com/forums/topic/41269-stumble-and-back-fire/#findComment-371188 Share on other sites More sharing options...
November 8, 201113 yr Author comment_371191 I assume that will require using an ohm meter. I don't know my arse from first base with an ohm meter..... What should I set it on?Running rich sounds like a coolant temp sensor. Use test procedure in fsm to check Link to comment https://www.classiczcars.com/forums/topic/41269-stumble-and-back-fire/#findComment-371191 Share on other sites More sharing options...
November 8, 201113 yr comment_371195 Resistance, ohm, depends on the brand as to how it's labeled. It's really easy. Link to comment https://www.classiczcars.com/forums/topic/41269-stumble-and-back-fire/#findComment-371195 Share on other sites More sharing options...
November 8, 201113 yr Author comment_371201 I downloaded the file but it says it is corrupt and I can't open it. Do you have the information on what the coolant temp sensor resistance parameters should be? Link to comment https://www.classiczcars.com/forums/topic/41269-stumble-and-back-fire/#findComment-371201 Share on other sites More sharing options...
November 8, 201113 yr comment_371204 The 77 file is the whole FSM, the 76 or 78 is broken in to chapters and will probably download and unzip. They all use the same sensor. Engine Fuel section. Link to comment https://www.classiczcars.com/forums/topic/41269-stumble-and-back-fire/#findComment-371204 Share on other sites More sharing options...
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