L67 extended starts - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 11-02-2005, 07:23 PM   #1
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Default L67 extended starts

My 98í SSEi just started to have harder starts about a month ago.
It cranks over for about 4 seconds longer than it used to. Happens 80% of the time,
cold or warm. Sometimes it starts right up. It doesnít have a problem when running.
I replaced the fuel pump 6 months ago, so I thought it went bad so then I replaced it again today. Same problem, it has extended starts still. I donít know if ití* the crank sensor or the cam sensor now. What do you all think? Plugs, wires, fuel filter all new with in 6 months.
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Old 11-02-2005, 07:36 PM   #2
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Your Fuel Pressure Regulator can cause hard starts as well. Have you checked your fuel pressure with a gauge?
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Old 11-02-2005, 07:45 PM   #3
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I was told by another person here locally that I should check the fuel pressure before I start the car. What is a recommended pressure? I'll have it checked tomorrow. Is it hard to replace a fuel pressure regulator? Thanks for your help. -Toddster
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Old 11-02-2005, 08:03 PM   #4
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http://www.bonnevilleclub.com/techinfo/?article=51

That'* key on, engine off. It shouldn't bleed down very fast. At idle, you should have at LEAST 40psi, and if you pull the vacuum line off the regulator or rev the throttle above 3k rpms, you should have somewhere around 45-47 or so. This would be acceptable for a mostly stock engine. Your needs may be higher as you mod. These are general close numbers based on my knowledge of the Series 1, but yours should be similar.

The FPR is mounted in the fuel rail and has one vacuum line going to it. Behind the SC.
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Old 11-03-2005, 02:19 AM   #5
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I've noticed this on a few bonne'*. If the car sits for awile the first start is hard. Now that I have a FP gauge I can clearly see that the times it starts hard it will have a FP lower then 40. I'd like to check the volts on the hard starts but dont have a gauge. Try turning the key to the on position for a sec, then off, then back on for a sec, and then start it. Not sure why it does this I just know what 'works' for me.

FYI: this is on a brand new FP and a good FPR.
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Old 11-03-2005, 06:49 PM   #6
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I did not get a chance to check the FP yet but will do this tomorrow for shure.
However I do turn the key on the way you discribed, I even do that up to three times. No change I hope it is the FP switch so I can fix this problem once and for all.-Toddster
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Old 11-08-2005, 07:14 PM   #7
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OK I finally had a pressure gauge put on my car and tested the pressure. The pressure reads 40 PSI. When I turn the key to on, the pressure reads 47 PSI. Then turn on the car the pressure bleads down 10 PSI every second and stops at 40 PSI. Is this OK or do I have a injector that is bleading down?-Toddster
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