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Old 06-05-2003, 05:52 AM
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Question 86 Grand National

A friend of mine has an 86 Grand National that has a problem that we can't pin down to any one thing. The car starts and idles fine, the problem seems to be with accelerating. He's replaced the fuel pump and had the injectors clean even replaced the knock sensor and coils but no luck. Does anyone have any idea what this could be?

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Old 06-05-2003, 11:54 AM
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What kind of "problem" do you have with accelerating?
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Old 06-10-2003, 10:28 AM
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It seems to be turbo lag but we can't figure out what is causing the problem. The car just doesn't seem to want to build RPM's.
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Old 06-10-2003, 02:17 PM
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Here is a Turbo Buick board.These guys are can help.
TurboBuick
Hope this helps!
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Old 06-10-2003, 03:08 PM
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Is this a new problem or something that has always been there? Does the car make boost at all? What changes have been made if it is new? Does he have an Air Fuel guage? Details.....we need details.

Chris
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Old 06-11-2003, 10:31 AM
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Re: 86 Grand National

Quote:
Originally posted by Hoyt
He's replaced the fuel pump and had the injectors clean even replaced the knock sensor and coils but no luck.
This is a new problem, the car builds some boost but not much, and no he doesn't have an Air Fuel guage. We have had the car put on a computer and the only code that showed up was the knock sensor.
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Old 06-11-2003, 12:23 PM
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Doesn't the knock sensor retard the timing? I'd throw a timing light at it and see what the total timing is.



C
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Old 06-11-2003, 05:47 PM
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Good point Fat50. The knock sensor takes out timing to stop detonation. If the knock sensor is not working the timing may be backed way out. This would certainly cause a problem.

Chris
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