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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 Lt1 long crank?

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96Brougham



Posts : 819
Join date : 2009-02-02
Age : 28
Location : Easton MA

PostSubject: Lt1 long crank?   Tue Apr 19, 2011 9:04 pm

96 Fleetwood

Full tune up(opti, plugs,wires, water pump, coolant temp sensor, t-stat) done about 25k miles ago

It's developed a long crank. Runs perfect once it's started, no skip or stumble or anything.

When I crank, it'll turn over for about 7 seconds and I'll stop and turn the key back. Sometimes it'll catch, stumble a little, then be fine. Most of the time though I turn the key back, then try again and it starts RIGHT away with no issues. Anybody run into this problem before? It's embarrassing lol. I have no CEL. Don't know what to start checking first! Thanks guys -Paul
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PostSubject: Re: Lt1 long crank?   Tue Apr 19, 2011 9:11 pm

fuel issue. Weak pump, clogged injectors, dirty sock or filter, bad regulator. I would check fuel pressure at start up. A weak pump will cause your condition.
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96Brougham



Posts : 819
Join date : 2009-02-02
Age : 28
Location : Easton MA

PostSubject: Re: Lt1 long crank?   Tue Apr 19, 2011 10:56 pm

Thanks for the reply Billy. I'll check fuel pressure at start up if it ever slows down at work, its been crazy the last couple weeks. As far as injectors go, what would be the best way to clean them? We have a machine at work thats supposed to clean carbon out of the engine and clean the injectors, it's not motorvac but similar. Uses BG products. Would this help?
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PostSubject: Re: Lt1 long crank?   Wed Apr 20, 2011 5:59 am

96Brougham wrote:
Thanks for the reply Billy. I'll check fuel pressure at start up if it ever slows down at work, its been crazy the last couple weeks. As far as injectors go, what would be the best way to clean them? We have a machine at work thats supposed to clean carbon out of the engine and clean the injectors, it's not motorvac but similar. Uses BG products. Would this help?
Couldn't hurt.

Listen for fuel pump prime with key on without starting engine.
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96slowss



Posts : 855
Join date : 2010-06-09
Age : 28
Location : Halifax,MA

PostSubject: Re: Lt1 long crank?   Wed Apr 20, 2011 10:26 am

turn the key forward, let the pump run turn back off, turn it on again, let the pump run again. then start it. if it fires right up u deff. have a fuel delivery/pressure issue.
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sdstick



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

PostSubject: Re: Lt1 long crank?   Wed Apr 20, 2011 12:08 pm

96Brougham wrote:
......We have a machine at work thats supposed to clean carbon out of the engine and clean the injectors, it's not motorvac but similar. Uses BG products. Would this help?

I've heard good things about this process (when done right) but never knew anyone with 1st hand knowledge.
I'd be interested in what you thought if you have this done.

_________________
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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jvette65



Posts : 111
Join date : 2010-02-16

PostSubject: LT1 Long Crank   Wed Apr 20, 2011 6:43 pm

Agreed sounds like fuel delivery or pressure. A couple of checks can be made to pinpoint the problem. 1) Get a good fuel pressure gauge (one that goes to 65 psi for fuel injected vehicles)and attach it to the fuel rail pressure fitting close to the the fuel pressure regulator.
2) With key on and engine off, check the fuel pressure reading, should be at approx 43 psi and stay there. 3) Shut off ignition (key off) and check gauge, it should stay at 43 psi and not bleed down. If it bleeds down slow, could be FPR (fuel pressure regulator-pull vac hose at FPR connection and see if it's wet with gas, if it is, replace it) or partially stuck open or shorted injector(s). If fuel pressure bleeds down fast it could be fuel pump check valve. 4) If your not getting fuel pressure at or near 43 psi it's the pump getting tired.
5) To check for the different bleed conditions, you need to disconnect the fuel line feed at the fuel rail, and plug it with a fuel line plug tool and verify bleed down or not. Key on engine off, if no bleed down that means the fuel pump check valve is ok, and the bleed would be 'downstream' from the plug tool. 6) Re-connect fuel line. 7) you can then double check the FPR and the injectors. Some people pull the rails with injectors and place a pan under them, put key on engine off and look for leaking injector(s). Hope this helps. Usually I like to do some quick diagnostics to help find the worn out part before digging in too deep. -Joe
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96Brougham



Posts : 819
Join date : 2009-02-02
Age : 28
Location : Easton MA

PostSubject: Re: Lt1 long crank?   Wed Apr 20, 2011 8:11 pm

Thanks for the advise guys. I'm going to troubleshoot this next week at work ifnit slows down..
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GasTT



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

PostSubject: Re: Lt1 long crank?   Wed Apr 20, 2011 10:32 pm

I know a bad connection to the coolant temp sensor will cause a hard start. Its worth a look.
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96slowss



Posts : 855
Join date : 2010-06-09
Age : 28
Location : Halifax,MA

PostSubject: Re: Lt1 long crank?   Wed Apr 20, 2011 11:16 pm

GasTT wrote:
I know a bad connection to the coolant temp sensor will cause a hard start. Its worth a look.

ya, my friend mike has a hard 2nd start only because the coolent temp sensor wires.
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Tomz9C1



Posts : 1486
Join date : 2009-01-21
Age : 53
Location : Rumford, Maine

PostSubject: Re: Lt1 long crank?   Thu Apr 21, 2011 4:46 am

96Brougham wrote:
96 Fleetwood

Full tune up(opti, plugs,wires, water pump, coolant temp sensor, t-stat) done about 25k miles ago

It's developed a long crank. Runs perfect once it's started, no skip or stumble or anything.

When I crank, it'll turn over for about 7 seconds and I'll stop and turn the key back. Sometimes it'll catch, stumble a little, then be fine. Most of the time though I turn the key back, then try again and it starts RIGHT away with no issues. Anybody run into this problem before? It's embarrassing lol. I have no CEL. Don't know what to start checking first! Thanks guys -Paul

How many miles on the engine?
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PostSubject: Re: Lt1 long crank?   Today at 5:31 am

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