1988 Camaro - Team Camaro Tech
Troubleshooting Diagnosing problems done here.

 
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post #1 of 5 (permalink) Old Jun 12th, 01, 10:40 AM Thread Starter
 
Join Date: Jun 2001
Location: San Carlos, CA, USA
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I love my 88 Camaro (v8 305 eng.) Problem with it lately is I just had it tuned (before it was due) because it was idling a little rough and thought it needed the tune up. After the tune up it is now running even rougher. I notice it changes with the types of gas I use sometimes? Sounds strange I know?
Also, now and again it makes a humming noise when I'm slowing to a stop. It's like the noise winds down as I slow down to a stop. It's a noise I've never heard in a car before and a humming sound is the only way I can describe it. It has 112,000 miles now and I have to say, whatever goes wrong with it will be repaired as I LOVE MY CAMARO!

Any assistance would be greatly appreciated!!
Peggy Lee is offline  
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post #2 of 5 (permalink) Old Jun 12th, 01, 01:37 PM
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Join Date: Jan 2001
Location: conway s.c.
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When you say "types of gas" are you referring to different brands of gas or different grades of octane (87, 89, 92, or 93)? These different grades of octane can affect the way your engine performs. I prefer to use high octane (92 or 93)in all my cars, whether it is my wife's Colt Vista or my 1989 IROC-Z. It burns cleaner and has a better emission rating. Can't help you with the humming.
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post #3 of 5 (permalink) Old Jun 12th, 01, 01:43 PM Thread Starter
 
Join Date: Jun 2001
Location: San Carlos, CA, USA
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I only put the highest octane gas in my car. I mean from Shell to Chevron. Sometimes I get in the car and it idles fine and then after a couple miles it's rough again. Can't understand what makes it change? The humming sound is mysterious I must say...I've never heard a sound like this in a car in my lifetime...thanks for the response. This is my first time on a chat like this and I'm really impressed!
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post #4 of 5 (permalink) Old Jun 12th, 01, 03:07 PM
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Join Date: Jan 2001
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Was your tune-up done by a reputable mechanic and what was done to your car during the tune-up. If your tune-up was done by a reputable mechanic, most of them will work with you to resolve the problem with little or no charge since they take pride in their work and hate to think they've done a bad job or repair. Also, where, roughly does the humming sound like it is coming from and is it a high or low pitch sound. This humming could be caused by a vacuum leak somewhere sucking in air which would cause your rough idle. The reason it would seem to wind down as you come to a stop is that lower speeds less air would be sucked through the leak.
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post #5 of 5 (permalink) Old Jun 12th, 01, 03:41 PM
 
Join Date: May 2001
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A rough idle could be many things, especially if it got worse after the tune up. Did you use performance spark plug wires that you had to cut yourself? If so, you might have hooked a wire up with a bad connection. You didn't specify what type of injection, but you may have a vacuum leak. Does this rough idle cause any hesitation or loss power? Have you tried checking for computer codes through the ADLS under the dash?
As far as the humming, could it possibly be coming from the brakes? Do you have an after market stereo? Due to poor grounds near the stereo area, my stereo humms through the speakers when I slow down nd also when I turn on the windshield wipers.
Be sure to add a little more detail to your post, it will help us work through your problem. Brian
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