cold start problems and bad brake pedal feel - 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 11-22-2004, 12:07 AM   #1
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Default cold start problems and bad brake pedal feel

my '93has 95K and is just starting to compile problems for me. I just replaced both calipers and rear brake cylinders and my pedal still feels poor after bleeding the brakes repeatably. Any suggestions would be appreciated. As for the cold start, I replaced the plugs, wires, fuel filter, and the idle air sensor plus cleaned the throttle body and the car still takes a few tries to start and acts as though it is going to stall. Once the sputtering is over with the rpm rises as it should upon a cold start. It is driving me nuts so again any input would be greatlly appreciated!!
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Old 11-22-2004, 01:53 AM   #2
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Just a thought -- how about the master cylinder? A leaking master can cause low pedal, especially if the seals inside are worn.

And with the no start, did you check the fuel pressure regulator? WIth the car running, pull the vacuum line on the regulator you shouldn't see any fuel leaking out. If there is fuel leaking out, you have a leaking fuel pressure regulator.
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Old 11-22-2004, 10:43 AM   #3
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Is your pedal too hard or too squishy? If it'* too hard, i'd say combined with the sputtering idle you could have a vacuum leak or bad booster. (but i've never heard of booster problems on these cars) If it'* too squishy you've just haven't got it bled. Search for bleeding the breaks...everyone has trouble with bleeding these cars it seems.
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Old 11-22-2004, 10:59 AM   #4
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dont rule out the break lines
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Old 11-22-2004, 11:57 AM   #5
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When you changed the rear cylinders did you re adjust the shoes? Maybe they are not out far enough?

Remember the rear brakes are the ones that give you pedal 'feel'. I would check the rear adjustment on the shoes.

Jay
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Old 11-22-2004, 02:42 PM   #6
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yeah if you take the drums off again, lube up those self adjusters really well. they are notorious for not self adjusting. that happened to me this summer when i replaced the shoes.
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Old 11-22-2004, 09:42 PM   #7
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Here'* my bet on the brakes. You've got air in the ABS part of the brakes, Happened to me. Just take the car to a gravel lot or road and lock up the brakes, It should pump the air out of the ABS. Then bleed like normal, And repeat. I had to do this three times. Make sure you do this near home as I had to use my E-Brake the entire way home.
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Old 11-23-2004, 11:43 PM   #8
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Thanks for the suggestions. The brake problem was fixed by bleeding the master cylinder and did that ever make a difference. Now i just have to figure out the starting problem. I have a feeling it is either the injectors or the fuel pump. Now I also have a sound coming from the front driver'* side wheel. Have any of you had to replace the wheel bearing on your Bonneville? Thanks again for your suggestions. I keep you posted on the starting problem.
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Old 11-24-2004, 12:57 AM   #9
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Heh......
Quote:
Have any of you had to replace the wheel bearing on your Bonneville?
Yeah, you could say that.

VERY common to find bad wheel bearings on GM front wheel drive cars. The easiest way to rule that it IS a wheel bearing is to lift the front of the car, put it in neutral, and spin the tire while GENTLY resting your fingers on the coil spring. You shouldn't be able to feel anything. If there'* a bad wheel bearing, you'll feel the vibration in your fingers through the coil.
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