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740 Rex loves breathing ether to start 700 1990

posted by  sherm on  Tue Jan 19 11:54 CST 2016
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last visit: Mon Oct 6 20:34 CST 2014
[RELATED]

Hey BB'rs
Need help with the family fleet backup car. 90 740 RexReggie NA. When cold, she'll crank and crank and crank until the battery's out of juice w/o starting. If I give her a simple squirt of ether thru a vac nipple in the mani, she lights up instantly and then runs great. new fuel pump relay, new plugs/wires, new cold start inj. NO CODES. Because she runs great after the ether, I have to assume the fuel pump is fine [and the pump's only a few year's old]. If the temp sensor has gone south, then default should still fire the cold start, so I've eliminated that one...

Looking for ideas...Remember- once she lights all is good
Thanks all.
--
The Family Fleet '90 745 16v; '90 745 GLE; 96 855T; 99 XC, collectively approaching 900,000mi and going strong.








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    740 Rex loves breathing ether to start 700 1990

    posted by  Milanomike on  Sat Jan 23 08:43 CST 2016
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    last visit: Sat Oct 11 22:27 CST 2014
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    I would check the fuel pressure at the rail. you need 35 psi while she is idling, if you blip the throttle the pressure should increase to 45 psi. If not, suspect the fuel pump. Low pressure can cause harder starting and sluggish response on the road. Also make sure fuel pressure regulator is good, i.e. not leaking. Seems like you have spark and air!








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      740 Rex loves breathing ether to start 700 1990

      posted by  sherm on  Thu Feb 4 19:35 CST 2016
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      last visit: Mon Oct 6 20:34 CST 2014
      [RELATED]

      thx. pump is not old, and fp regulator is about yr old, so doubtful. I am leaning towards a gunked up filter, which hasn't been changed in a while.
      --
      The Family Fleet '90 745 16v; '90 745 GLE; 96 855T; 99 XC, collectively approaching 900,000mi and going strong.







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