Re: first year for CIS and different from 76 - Bulletin Board

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Re: first year for CIS and different from 76
Posted by Gary Stottler [Email] (#1463) [Profile/Gallery] (more from Gary Stottler) on Thu, 1 Dec 2016 09:34:41

In Reply to: first year for CIS and different from 76, jimmy, Mon, 28 Nov 2016 00:59:26
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This may be your opportunity to make electrical wiring diagnosis and repair one of your strong points! Seriously, if someone has, for example, put in a jumper wire in place of the fuel pump relay (there definitely should be one) then that indicates a Band-Aid fix to some other problem. Getting the proper wiring diagram/schematic is definitely what you want to do, and then tracing things step-by-step will help you get acquainted with the system and find the problems. For example, in 1975 there was a set of contacts in the airflow sensor plate that would open when the plate is closed (no airflow) so that the fuel pump won't run if the engine is not turning. If that has failed "open", then the start/system relay would never be able to turn on the fuel pump relay. I'm not sure (sorry Jimmy) that I'd rush to replace a 42 year old wiring harness with a 37 year old one, I think you would still have to sort out a lot of age-related problems. For example, in pretty much all 99s the electrical terminals underneath the fuse/relay panel which connect to the relays, fuses, etc. tend to corrode and relax their tension and cause all kinds of goofy problems, so going through and cleaning and re-tensioning all of those would be a good place to start. The 1975 wiring diagram is in the red 75-80 service manual and it's actually big enough to read. If you don't have access to that contact me and I can scan it for you. Good Luck! Gary

_______________________________________ Gary Stottler

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