99 bonneville help! - 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 02-01-2009, 02:58 PM   #1
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Default 99 bonneville help!

ok me and my dad have been working on my car for weeks.... my dads a mechanic and has ran his computer on it and it has found nothing wrong with it..... my car wont start... it keeps cranking but never starts... after cranking you can hear the engine choke alittle..... so we have replaced the crank sensor, fuel pump and all hoses, starter, altentor and still doesnt run! can anyone help?
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Old 02-01-2009, 03:19 PM   #2
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First up try unplugging the maf. Might want a little throttle to start the first couple times if the maf is bad. The car will start and run with the maf unplugged. I've seen them low show readings, yet the readings were low enough that the pcm thought it had no airflow..one could be fooled into thinking the maf was working when it is keeping the motor from starting.

Secondly observe the security light when you crank and let the key to fall back to the "on" position is the security light on or blinking? (VATS)

Confirm the motor is getting fuel. It is possible to have fuel in the rail and not have the injectors firing (another VATS method). I like to use a stethescope to hear the injectors clicking or put a 194 bulb into any one of the FI connectors.

Check for spark. Pull plugs to ensure they aren't wet. An easy test of the coils is to remove one plug wire at the coil. The spark should easily jump around while cranking.
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Old 02-01-2009, 03:19 PM   #3
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Welcome to the club BONNEVILLE99. I'am not sure what type of 99 this is,can you fill out your sig. Thanks Well how many miles are on her and ?? what happen prior to the car not starting anything in particular?
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Old 02-01-2009, 03:26 PM   #4
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hey thanks yeah sorry it is an SE and it has 227,000 on it haha was company car all on interstate... yes it has spark cause my dad tryed alittle starting fluid and we got a fire.... haha
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Old 02-01-2009, 03:36 PM   #5
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As bill said, work on the fuel side. Check the injectors. Check for fuel pressure, unplug the MAF and try that.
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Old 02-01-2009, 04:51 PM   #6
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ok car is running after new fuel pump and plugs... after i shut it off and came back out about ten min later it barely started and revs it self from 500rpm to 2500rpm and just goes up and down... what could be causeing this?
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Old 02-01-2009, 05:15 PM   #7
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Are you getting any codes? Did you change the filter?
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Old 02-01-2009, 05:20 PM   #8
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we dont have a computer hooked up to it right now.... and no we didnt change the filter
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Old 02-01-2009, 05:32 PM   #9
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any ideas..... my dad thinks it may need reset...like i forgot how to idle....
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Old 02-01-2009, 08:18 PM   #10
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Doing a reset will reset the trim table.

Pull the plugs to see if the plugs are wet with gas.

Did you test the coils and spark plug wires? You can have a spark but it'* weak and wont give a good burn.
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