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I'm getting a weak spark -- Are you sure? 200 1982

Chris,
Yesterday you said:

"Okay, the car starts when I bypass the fuel pump relay. Does this single this relay out or is there something else could be?

To me this suggests two things (if it consistently starts & runs with pumps jumpered):

1) The ignition works when the fuel is there.

2) The fuel relay:
(a) could be bad
(b) may not be getting the required ground pulses from Coil #1 (red/white wire)
(c) may not be energizing due to corroded/weak contacts at fuse 13
(d) may not be getting pump voltage due to corroded/weak contacts at fuse 7

When you jump the fuses, you are putting a solid +12V from fuse 7* to fuse 5, which is where the fuel relay puts it (on the LEFT/input contact). From there the voltage goes directly to the main pump, and also thru fuse 5 to the tank pump.

* Any fuse, 6 thru 10 will work. They are all common on the hot/left side, which is where I recommend connecting the jumper (so you are temporarily bypassing the fuse also). If the fuse 7 contacts are OK, jumper from the Right side and you duplicate the normal circuit, jumping over the relay.
--
Bruce Young
'93 940-NA (current) — 240s (one V8) — 140s — 122s — since '63.






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New I'm getting a weak spark...help [200][1982]
posted by  Crazychopstick  on Tue May 10 20:06 CST 2005 >


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