99 Chevy S-10 4.3 K&N cold air intake, blackwidow venom 250
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Low oil pressure+ knocking noise
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Replaced the intake manifold and distributor with what? The distributor drives the oil pump. There is a flat spine on the bottom of the distributor that has to align with the oil pump. If your distributor isn't installed all the way down so that the spine fits in the shaft up from the oil pump you'll have zero oil pressure.
If you don't get it fully seated, it will start, run (badly because it is out of time) but no oil pressure if not fully seated.
Distributor
![Hand Wood Finger Thumb Nail]()
Oil pump drive shaft:
![Font Audio equipment Gadget Electric blue Rectangle]()
![Automotive tire Rim Automotive wheel system Gas Wood]()
If you don't get it fully seated, it will start, run (badly because it is out of time) but no oil pressure if not fully seated.
Distributor
Oil pump drive shaft:
99 Chevy S-10 4.3 K&N cold air intake, blackwidow venom 250
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8 Posts
The distributor is fully seated and the oil pump is engaged. It's getting about 15 psi of oil pressure ,but it sounds like it's knocking
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did it do this before the changing of parts?
99 Chevy S-10 4.3 K&N cold air intake, blackwidow venom 250
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8 Posts
No, before it started right up, now it takes awhile and yesterday I started it and the noise changed from pistons to valve train and the oil pressure has gone from 15-20 to 40
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4,437 Posts
did it do this before the changing of parts?
thats not what i asked.
did it have 15 psi of oil pressure before you changed all the parts....
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That kinda sound is Expensive.
99 Chevy S-10 4.3 K&N cold air intake, blackwidow venom 250
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8 Posts
No it had 40 psi of oil before, now it has 40 psi again but also lifter tick
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4,437 Posts
The only thing that could affect oil PSI is the oil filter.
Id change it just for peace of mind.
If you have the dist in worng it wouldnt run.
there is zero anything else you did that would cause oil psi problems.....DID YOU leave a rag in the intake valley?
Id change it just for peace of mind.
If you have the dist in worng it wouldnt run.
there is zero anything else you did that would cause oil psi problems.....DID YOU leave a rag in the intake valley?
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1,161 Posts
Wandering Oil Pressure ? I'd run a quality mech gage to verify before
' Jumping To Conclusions '
Actually, there are several other possibilities; one example could be improper bearing clearances. But, based on what the OP has stated so far, I'd suspect something else before that.
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true, but, he R&I the intake, which wouldnt effect the oil psi at all.
He did an oil change, so in THIS scenario, the oil filter is the only thing which could effect the oil pressure.
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As a GM tech , I picked up 2 pristine 454 blocks from metal discard bin , warranted for Main brng knock. Actual cause was defective mech fuel pumps ! Thanks to 'jump to conclusions
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What you're hearing could be pre-ignition. Double check the routing of your spark plug wires. Not rare for folks to cross #1 & #3 due to the fact they are the only two where the distributor layout doesn't match the cylinder layout. I've heard of times where engine won't startor will start and run badly...though I've never heard one way or another how the oil pressure was effected.
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A possibility here is the oil cooler itself expanding under pressure, thereby acting as a sort of pulse damper. Think : old or damaged brake flex hoses that then expand , reducing brake line pressures and brake efficiency.
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