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Old 06-02-2012, 04:53 PM   #1
 
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Default C4 LTI Oil pressure?

Okay, I'm thinking about getting a 93-96 C4. I looked at two today, both at stealerships. The oil pressure on the guage, not the digital readout seemed low. Just wondering if anybody has any experience with this and what it should be. Thanks in advance! BTW one car had 50K and the other had 61K.
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Old 06-02-2012, 10:17 PM   #2
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My little brothers reads low too. Seems to jump where it should be once the revs come up, however his has 115,000 miles. He said it always read that though. Awesome cars if you're getting one, I definitely enjoy taking his for a ride every once in a while. Super tq-y.
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Old 06-03-2012, 06:51 AM   #3
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If you're concerned about low pressure, you can just put a mechanical gauge on it to check it out. That's a common thing with ALL LT1 cars though, they read on the low side at idle and with a little rpm they jump up
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Old 06-03-2012, 03:34 PM   #4
 
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Quote:
My little brothers reads low too. Seems to jump where it should be once the revs come up, however his has 115,000 miles. He said it always read that though. Awesome cars if you're getting one, I definitely enjoy taking his for a ride every once in a while. Super tq-y.
Yeah, I had a 96 C4 for a little while. Even though it was an older car it still handled great and was a blast to drive!

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That's a common thing with ALL LT1 cars though, they read on the low side at idle and with a little rpm they jump up
That's pretty much what I thought.

I'm really torn. I've put a fair amount of money in my Mustang, but man do I miss my old C4.
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Old 06-26-2012, 05:47 PM   #5
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I remember the digital and analog gauges on mine never matched. I think spec at idle is like under 20psi though so I wouldn't worry too much about it. In fact about the only thing u should dread is the opti-spark
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Old 06-26-2012, 05:57 PM   #6
 
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Wow, made this thread a while ago....

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In fact about the only thing u should dread is the opti-spark
Yeah, not sure it it's been replaced. So that kinda sucks.
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Old 06-26-2012, 06:26 PM   #7
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Well my original one lasted 90k miles, then I started going through them real quick. Luckily the 94-96 (or 97 in f-bods) are vented so they tend to last longer but believe me putting one on is hell
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Old 06-26-2012, 08:37 PM   #8
 
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Well my original one lasted 90k miles, then I started going through them real quick
How many did you end up replacing?!

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Luckily the 94-96 (or 97 in f-bods) are vented so they tend to last longer but believe me putting one on is hell
If it goes bad, I admit. I'm paying to have it done!
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Old 06-26-2012, 11:15 PM   #9
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I did 3 (plus there was the first one on the car) and then when I sold the car I needed another one. Part of the problem is that the stock GM ones are impossible to find and expensive when you do. I used aftermarket ones. And the real bitch is removing the water pump and distributor cap and crank pulley to get to the damn thing
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Old 06-27-2012, 08:55 AM   #10
 
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I did 3 (plus there was the first one on the car) and then when I sold the car I needed another one. Part of the problem is that the stock GM ones are impossible to find and expensive when you do. I used aftermarket ones. And the real bitch is removing the water pump and distributor cap and crank pulley to get to the damn thing
Three! Wow, that sucks! Did you find that any brand worked well? I thought the vented Optis' were a huge improvement!
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Old 06-27-2012, 09:05 AM   #11
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OEM are the best, and I've heard that even those fail brand new out of the box.

The opti isn't THAT bad. My stock one lasted me 180k, and still worked fine when I replaced it. I only changed it because I was doing headers and electric water pump, so I figured I would spend the money and do it before it failed. The second one was fine when I took it off at 240k, and I only replaced it because I switched to vented set up. The vented opti on the car since 240k is one I got in a box of parts and I don't know any history on it, but it was pretty filthy. I cleaned it up, threw it on, and have had no problems.

Just don't get it wet and you'll be ok.
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Old 06-27-2012, 09:56 AM   #12
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THING IS, MINE NEVER GOT WET... I DONT KNOW WHY IT FAILED BUT I KEPT LOSING SECONDARY CAM SINGAL OR SOMETHING LIKE THAT. IM SURE IT WAS THE SHITTY SUMMIT REBUILDS I WAS BUYING BECAUSE WHEN I SOLD MINE THE DUDE PUT ON AN OEM ONE AND ITS BEEN FINE EVER SINCE. THE STOCK ONE WAS DEFINETLY THE BEST. I WAS EVEN RUNNING A AFTERMARKET COIL AND A 150 SHOT ON MY MOTOR WITH THE STOCK UNIT AND IT WAS A CHAMP.
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