90 Lesabre sometimes cranks but doesn't start - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1987-1991 Parley with regards to your 1987 to 1991 Bonneville, Olds 88 or Buick Le Sabre Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 07-15-2006, 06:24 PM   #11
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Allright then, all of the things I have done today seem to have cured the misfire, but the random problem of the car cranking away without starting still exists! Anyone have any other ideas?

matt
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Old 07-15-2006, 06:38 PM   #12
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How'd the old plugs look - black, brown, light brown, almost white, white. Did they all look about the same?
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Old 07-15-2006, 08:32 PM   #13
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Thanks for the PM -I looked at the pictures of your plugs in the general section. The gray color seems unusual. Mine have always been almost white with light brown near the tip. They all seem about the same color which is what I wanted to make sure of. I think the next thing you should do is check the fuel pressure with a gauge.
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Old 07-15-2006, 11:35 PM   #14
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Fuel pressure is 35 running and 45 with regulator vacuum off.

While not knowing the exact specs, these numbers seem right in line to me?

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Old 07-15-2006, 11:43 PM   #15
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My Chilton'* manual says 41-47 with the key on then drop to 31-40 when started. Does it hold the pressure after turning off?
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Old 07-16-2006, 01:00 PM   #16
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Quote:
Originally Posted by tz2772
Fuel pressure is 35 running and 45 with regulator vacuum off.

While not knowing the exact specs, these numbers seem right in line to me?

matt
On the Vin C 3800, you should see 37-41 Psi... 45 psi with the vacume removed from the regulator is normal... Perfectly within specs... A couple psi out of range at idle is also normal

Once you turn the ignition off does it hold pressure?

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Old 07-16-2006, 05:39 PM   #17
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I no longer have access to a gage, so I cannot check the pressure after turning off the key, I should have done it yesterday, damn. Either way, today I took my car ona 35 mile trip, 2/3 of which was interstate, and using 1.7 gallons, so thats about 20.5 mpg mixed, somethings still wrong. I had the crank problem appear once today only, BUT, the car is again getting shaky under light throttle.
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Old 07-17-2006, 01:32 PM   #18
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Something is not quite right... I can easily get that milage out of my 91 Bonnie in the city...

If you dive into it more please let us know...

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Old 07-24-2006, 02:35 PM   #19
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OK new fuel pressure test today.

When the car starts, pressure jumps to 40, and then is at 35 while running.
Key off, the pressure falls immediately to 20 and then slowly falls from there.

I have already been told this is a pump problem
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Old 07-24-2006, 02:37 PM   #20
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Either the pump or the Fuel Pressure regulator...

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