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Old 12-31-2012, 01:03 AM   #1
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89 mustang gt HELP

So my 89 gt lags on turning on once it's on the oil pressure gauge is jumpy n the battery gauge moves as low as 10 when at a stop/idle
The car is a 5.0 with under drive pulleys
Can anyone help
Thnx in advance
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Old 12-31-2012, 01:05 AM   #2
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Have you had your alternator tested? It seems like it may be weak.
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Old 12-31-2012, 01:07 AM   #3
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Quote:
Originally Posted by Vazqueza90 View Post
So my 89 gt lags on turning on once it's on the oil pressure gauge is jumpy n the battery gauge moves as low as 10 when at a stop/idle
The car is a 5.0 with under drive pulleys
Can anyone help
Thnx in advance
The under drive pulleys are most likely your problem. They are known for causing charging and overheating problems. The factory oil gauges aren't very accurate, you'll need an aftermarket gauge for accuracy.
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Old 12-31-2012, 01:10 AM   #4
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Originally Posted by 93slowstang View Post

The under drive pulleys are most likely your problem. They are known for causing charging and overheating problems. The factory oil gauges aren't very accurate, you'll need an aftermarket gauge for accuracy.
Yeah, you're right. Especially if the under drives are smaller then the stock ones.
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Old 12-31-2012, 01:44 AM   #5
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Originally Posted by 93slowstang View Post

The under drive pulleys are most likely your problem. They are known for causing charging and overheating problems. The factory oil gauges aren't very accurate, you'll need an aftermarket gauge for accuracy.
I'm planning on upgrading to a 3G alternator this week
Will that help.?

---------- Post added at 11:44 PM ---------- Previous post was at 11:42 PM ----------

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Yeah, you're right. Especially if the under drives are smaller then the stock ones.
Should I change the alt pulley only or change them all back To stock
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Old 12-31-2012, 01:46 AM   #6
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I'm planning on upgrading to a 3G alternator this week
Will that help.?

---------- Post added at 11:44 PM ---------- Previous post was at 11:42 PM ----------



Should I change the alt pulley only or change them all back To stock
Are the stock ones bigger?
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Old 12-31-2012, 02:07 AM   #7
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Are the stock ones bigger?
I'm guessing they r
My dad gave me this car so I'm not sure
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Old 12-31-2012, 02:50 AM   #8
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Are the stock ones bigger?
I'm not sure my dad gave me this car and he is no longer here
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Old 12-31-2012, 02:58 AM   #9
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Have you had this problem all along?
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Old 12-31-2012, 11:38 AM   #10
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Have you had this problem all along?
Yes
If I change the alternator pulley would it fix the issue.?
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Old 12-31-2012, 12:29 PM   #11
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A 3G alternator will definitely help, changing the pulley on just the alternator won't.
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Old 12-31-2012, 12:42 PM   #12
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A 3G alternator will definitely help, changing the pulley on just the alternator won't.
Thnx
Ill keep u guys updated
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