Weird problem, 95 LT1
Thread Starter
Safety Car
Joined: Aug 2007
Posts: 3,772
Likes: 8
From: If You gave Your life to love them, so will I
St. Jude Donor '07-'08
Weird problem, 95 LT1
This just started today. Was running some errands earlier, had been driving around for about 15-20 minutes when I got to the store. When I left the store I was sitting at a red light and the oil pressure dropped to the line before 0. The ac was running and all the temps were normal, the idle was normal but when (I'm not a mechanic so I don't know how to accuratley describe) the alternator would run the idle would get rough and make a thud noise and shake the whole car then go back to normal. I turned the ac off and it continued. Driving is normal and there is no problem. I even put it in park and at idle everything is normal. It just happens while in drive with my foot on the brake. When I got home I let it sit for about 3 hours and went driving. Again everything was normal until I'd stop at a red light and it would start. Has anyone had a similar problem? And if so what was going on?
Thread Starter
Safety Car
Joined: Aug 2007
Posts: 3,772
Likes: 8
From: If You gave Your life to love them, so will I
St. Jude Donor '07-'08
Thread Starter
Safety Car
Joined: Aug 2007
Posts: 3,772
Likes: 8
From: If You gave Your life to love them, so will I
St. Jude Donor '07-'08
It was probably that, actually now that you say AC Compressor I'm pretty sure that is what I was hearing. I shut the AC off (completely) and it was still doing it. Sitting at idle in park it doesn't do it. Only when in drive with my foot on the brake.
Racer
Joined: Feb 2006
Posts: 399
Likes: 31
From: Clinton TN
How old is your battery? How many volts are you showing? Should be more than twelve 13-14. What I hear you saying is with your foot on the brake you had a problem but in park you didn't. Also, turning off the AC reduced the load. I'm not an expert by any means, just had those type issues with mine.
Thread Starter
Safety Car
Joined: Aug 2007
Posts: 3,772
Likes: 8
From: If You gave Your life to love them, so will I
St. Jude Donor '07-'08
How old is your battery? How many volts are you showing? Should be more than twelve 13-14. What I hear you saying is with your foot on the brake you had a problem but in park you didn't. Also, turning off the AC reduced the load. I'm not an expert by any means, just had those type issues with mine.
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Racer
Joined: Sep 2007
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From: Cerritos/L.A. California
Pro
Joined: Oct 2004
Posts: 628
Likes: 6
I think everyone saw 'alternator' and is now trying to help with a voltage issue. However, your original post says 'oil pressure' - did the oil pressure light come on? Can you describe the thud noise or do you think it is the AC compressor switching on and off? Also - does the oil pressure go up when you rev the engine?
