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  1. T

    5.7 EFI running hotter on starboard exhaust

    Cruising at 3200. Temp never budges from 160. Both manifolds within 10 degrees of each other.
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    5.7 EFI running hotter on starboard exhaust

    Back in the water. At 1500 RPM she’s holding steady at 160. No fluctuation between 220-180. Will see what speed does.
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    5.7 EFI running hotter on starboard exhaust

    Mine seem to be opposite. On the house both sides run fine and thermostat acts normal. In the water even in neutral it climbs to 160 and stays or climbs to 180 before falling to 160. Normal is 120-160 historical for this engine.
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    5.7 EFI running hotter on starboard exhaust

    New one is in but now I wished I tested them in the same pot. Regardless, would that cause one side to be 30-40 degrees hotter just because of the thermostat?
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    5.7 EFI running hotter on starboard exhaust

    Just tested the old thermostat in a pot of water and my IR temp gun and it appears to start to open at 175 and fully open at 190. No movement at all at 160-174. Is that right?
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    5.7 EFI running hotter on starboard exhaust

    The thing is it never use to do that. Even last week then the circ pump failed. There has to be an issue.
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    5.7 EFI running hotter on starboard exhaust

    On the hose it acts normal after replacing water circ pump. In the water it runs hot on starboard still. Going to get new thermostat kit now. Short of that working it’s gotta be a blockage in the hose or manifold right?
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    5.7 EFI running hotter on starboard exhaust

    So when I removed the old circulation pump I could here some severe rattling. Installed the new one (test tomorrow on the hose) and opened up the old one and this is what I found. The center shaft sheered at some point.
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    5.7 EFI running hotter on starboard exhaust

    First pic is the pulley that is attached to the housing that is leaking. The second pic is if the housing. When I felt the underside of the housing I could feel and remove a piece of the gasket between the housing and where it mounts to the engine. What is the housing called? I need to remove...
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    5.7 EFI running hotter on starboard exhaust

    Big center top pulley housing is leaking. I ran it up to full turtle and temp dropped after a minute of running to 120. Then started to spike. Immediately brought to neutral and found water leaking out of top center pulley housing. What does this mean?? Limping in at clutch. Just a trickle and...
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    5.7 EFI running hotter on starboard exhaust

    On the water right now and temp gauge is showing 160-180 again. It almost sounds like a bearing rattle a little but not super noticeable. 80 degrees on port manifold and 100 on starboard. Very front of thermostat is 125. Any ideas?
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    5.7 EFI running hotter on starboard exhaust

    It’s weird it’s back to “normal” as far as I know it. The other day in the hose after I came in noticing above avg “normal” temps I put it on the hose and could sea steam coming from starboard exhaust from outdrive but port was cold. Now after removing and reinstalling the pump and putting a new...
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    5.7 EFI running hotter on starboard exhaust

    Ok the engine is running right now for 15 minutes on the hose. Temp gauge is doing what it use to and goes to 160 then back to 120 then back to 160 over the course of about 20-30 seconds. IR gun shows thermostat housing no warmer then 106 even when gauge shows 160. Stbd manifold is warmer then...
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    5.7 EFI running hotter on starboard exhaust

    I have a IR gun and will report after I attach water pump again. It’s always run up to about 160 then drops to 120 which is why I noticed something was up when I saw it stay between 160-180. Also usually both water exhaust temps are about the same. Now they are not. I’ll report back with temps...
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    5.7 EFI won’t turn over

    Closing the loop on this. It was the 90 amp fuse on the starter. It failed because thr orange wire to alternator was chaffed and grounding out on the engine mount.
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    5.7 EFI running hotter on starboard exhaust

    I removed and inspected the water pump and impeller expecting to find a bad impeller. But it was in great shape. Normally, engine runs around 160 degrees then when thermostat opens it drops to 120. The other day it was running around 180 until thermostat opened dropping it to 160 but no lower. I...
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    5.7 EFI won’t turn over

    I mis spoke. I tested the fuse itself for continuity and it was fine. I meant to say with out the fuse in place I could not get continuity from one side of fuse holder to the other. But when fuse installed I had continuity from ignition switch to past the fuse so that’s not the issue. I’m lost...
  18. T

    5.7 EFI won’t turn over

    With fuse in their is continuity behind dash at least till all wires entire harness.
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    5.7 EFI won’t turn over

    There is no continuity between one side of the ignition fuse and the other. There is continuity from red ignition wire to the side that connects to one side of the fuse. Does that mean there is a break further down inside the harness????
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    5.7 EFI won’t turn over

    Bought a new ignition. 3 prong. Which wire goes where please?
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