93 sts w/97 n. s. fuel pump problem
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Northstar Engines and System Technical Discussion Discussion, 93 sts w/97 n. s. fuel pump problem in Cadillac Engine Technical Discussion; I installed a 97 low milage (14,000) N.S. in my 93 sts and I have to wind it up in ...
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    chuck jenkins is offline Cadillac Owners Member
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    93 sts w/97 n. s. fuel pump problem

    I installed a 97 low milage (14,000) N.S. in my 93 sts and I have to wind it up in the mornings to get it to start. It starts good all day but I can hear the fuel pump running all the time. Help

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    BeelzeBob's Avatar
    BeelzeBob is offline I'm a Cadillac Fanatic!
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    Re: 93 sts w/97 n. s. fuel pump problem

    Have you checked fuel pressure with a fuel pressure gauge installed on teh schraeder valve fitting on the fuel rail while cranking cold to see if it is maintaining a constant pressure.??

  4. #3
    florida33779's Avatar
    florida33779 is offline Cadillac Owners Member
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    Re: 93 sts w/97 n. s. fuel pump problem

    Did you have any problems with the mass air flow sensor and if so how did you fix it. I have a 94 and just had a 97 motor installed and I have erratic idle problems I hear there is a fix but nobody can say where to get it.

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    chuck jenkins is offline Cadillac Owners Member
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    Re: 93 sts w/97 n. s. fuel pump problem

    I used the 93 throttle body (with no maf) with a spacer on the 97 intake. All 93 wiring harness and transmission. The 97 engine is a 275 hp engine but I can't see much difference in performance. I have not checked the fuel pressure yet. I need to buy a gauge and check it.

  6. #5
    chuck jenkins is offline Cadillac Owners Member
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    Re: 93 sts w/97 n. s. fuel pump problem

    Quote Originally Posted by chuck jenkins
    I used the 93 throttle body (with no maf) with a spacer on the 97 intake. All 93 wiring harness and transmission. The 97 engine is a 275 hp engine but I can't see much difference in performance. I have not checked the fuel pressure yet. I need to buy a gauge and check it.
    Hey florida33779 I'm florida33037 key largo. Where are you?

  7. #6
    florida33779's Avatar
    florida33779 is offline Cadillac Owners Member
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    Re: 93 sts w/97 n. s. fuel pump problem

    I was in New Port Richey Florida but now I'm up in Ohio. I'm sure going to miss the nice Florida winters.

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