BADASS of New England

An automobile club for the enthusiast who enjoys the last of the big GM cars. The rear wheel drive B and D bodys. Chevrolet Impala SS, Caprice, 9C1, Buick Roadmaster, Oldsmobile Custom Cruiser, Cadillac Fleetwood
 
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 Odd starting with LT1 motor

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GasTT



Posts : 2675
Join date : 2009-01-19
Age : 28
Location : Treasure Coast, FL

PostSubject: Odd starting with LT1 motor   Thu Apr 25, 2013 10:32 am

My wagon, the "beater" that was sitting for six years, cranks fast and fires on the second revolution to a brisk jump in RPMS then calms to a smooth idle. The motor really runs perfect.

My caddy, one of my "nice" cars on the other hand, cranks a little slower. It cranks a little more than the wagon. When it fires, its not brisk like the wagon. It actually kind of struggles, the RPMs rise slowly to idle. It idles fine, and runs really well while driving. No CEL, and it's only the startup that's not "perfect". Any ideas?

The wagon has 138k and the Caddy has 188k. They both have vette starters. While I don't know the exact history of the Fleetwood I'm pretty sure it was maintained. The wagon I know for sure the engineer who owned it maintained the mechanicals to pretty strict standards since 15k miles.

I was thinking maybe it isn't getting good fuel pressure at startup? Pump and sending unit both replaced about a year and a half ago. I'm gonna look into the FSM but figured I'd see if you guys have any ideas.

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95brmw



Posts : 1431
Join date : 2009-11-10
Age : 32
Location : Connecticut

PostSubject: Re: Odd starting with LT1 motor   Thu Apr 25, 2013 11:25 am

Sounds like a mix of my 9C1 and my FWB. A new battery fixed the 9C1's problem. My FWB still sounds pathetic when it cranks but comes up to speed right away.
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GasTT



Posts : 2675
Join date : 2009-01-19
Age : 28
Location : Treasure Coast, FL

PostSubject: Re: Odd starting with LT1 motor   Thu Apr 25, 2013 11:31 am

The battery is good. It cranks the same after it sat for a month or a few days.
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sdstick



Posts : 4278
Join date : 2009-03-20
Location : Revere, MA

PostSubject: Re: Odd starting with LT1 motor   Thu Apr 25, 2013 12:39 pm

I dont want to start throwing guesses at you...I'll keep them in my head where they belong.

You know new or relatively new means nothing. Throw a gauge on it & check pressure.

I've always found a crisp start is indicative of good ignition system parts...so plugs wires coil icm opti..grounds done the right way?

Need to have a tight vacuum system too

Doesnt mean it cant be timing related or control / sensor related

I'm in the middle of all this now...cant rule out things unless youve checked.

Personally, if the only issue is a less crisp start then your wagon....I'd overlook it for now.

Ya....I know you wont.... Smile

_________________
Steve


96BBB 28K 3.42 Bolt-ons
95BBB 100K 3.73 383 New DD...already broke fixt the 4L60E twice
95 Black WB4 Hole...ee...grail
96 Black WB4 No holes in this
95BBB 189K 3.08 Old DD Stolen...by Matt. Cool
Whine..eee...Silver LS6
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Matt Trakker



Posts : 5075
Join date : 2009-07-30
Age : 35
Location : Reading, MA

PostSubject: Re: Odd starting with LT1 motor   Thu Apr 25, 2013 2:40 pm

My SS does this sometimes. I just haven't had time to mess with it, and the car runs and drives nice so I kind of just don't care. Laughing

If I've been driving the car and go out to start it, it's a super crisp roar to life after less than 1 second of cranking. If it's been sitting and I start it, sometimes I have to crank it for a few seconds, and then it starts but it does the "lazy" start like you described and then runs fine after a few more seconds.

I've seen the fuel pressure regulator, some check valve in the fuel pump setup, and I forget what else listed as being a cause of it. I think the fuel tank vent hose is disconnected on this car too, up above the tank, so I need to fix that, but I don't know if that can cause a fuel pressure loss?
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sdstick



Posts : 4278
Join date : 2009-03-20
Location : Revere, MA

PostSubject: Re: Odd starting with LT1 motor   Thu Apr 25, 2013 2:48 pm

Do you prime the pump before going into the start position?
That works when you have a bleed down effect going on.
I didnt read Tims problem like that, but if I was wrong, maybe your feedback will help him. Arrow

_________________
Steve


96BBB 28K 3.42 Bolt-ons
95BBB 100K 3.73 383 New DD...already broke fixt the 4L60E twice
95 Black WB4 Hole...ee...grail
96 Black WB4 No holes in this
95BBB 189K 3.08 Old DD Stolen...by Matt. Cool
Whine..eee...Silver LS6
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Matt Trakker



Posts : 5075
Join date : 2009-07-30
Age : 35
Location : Reading, MA

PostSubject: Re: Odd starting with LT1 motor   Thu Apr 25, 2013 3:36 pm

Ha, yea, I only posted about it because I thought it might be what he's saying.

Sometimes when I feel like the car is going to do this, I turn the key on and leave it for a bit, then try to crank. Sometimes it helps, sometimes it doesn't change anything. Laughing
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Ironfistdog



Posts : 2124
Join date : 2011-01-11
Age : 35
Location : Warren, MA

PostSubject: Re: Odd starting with LT1 motor   Thu Apr 25, 2013 5:43 pm

Check the fuel pressure regulator. Take the hose off and see if gas comes out. Or if you can smell gas it's junk,
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MASShole9C1



Posts : 4211
Join date : 2009-12-16

PostSubject: Re: Odd starting with LT1 motor   Thu Apr 25, 2013 6:33 pm

It's missing an LS swap face palm
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GasTT



Posts : 2675
Join date : 2009-01-19
Age : 28
Location : Treasure Coast, FL

PostSubject: Re: Odd starting with LT1 motor   Thu Apr 25, 2013 8:10 pm

Haha
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