power loss when put under load
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Junior Member
Joined: Jan 2019
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power loss when put under load
just replaced intake manifold, egr valve, plugs, coolant, oil and my truck idles and revs fine in neutral till I put it in drive and my engine loses almost all power can anyone point me into the right direction
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Chief Engineer
Joined: Jul 2014
Posts: 169
Likes: 50
From: Summerville, SC
You haven't said if it's thrown any codes so I'll assume there are none.
Ok, so from experience I can tell you it takes very little fuel to rev an engine in Park. That really doesn't tell you anything. Check for fuel pressure at the injector rail. I don't have a 4.6 but the test port should be located near the air intake. Normal fuel pressure should be 50-60 psi. Observe the readings in Park and again in Drive. If the fuel pressure is low in Park, or you see the pressure drop off when you put it in Drive then it's either a plugged fuel filter, your fuel pump needs checking or that fuel pump module is trash.
if your fuel pressure looks good then you'll wanna start looking at your injectors.
Ok, so from experience I can tell you it takes very little fuel to rev an engine in Park. That really doesn't tell you anything. Check for fuel pressure at the injector rail. I don't have a 4.6 but the test port should be located near the air intake. Normal fuel pressure should be 50-60 psi. Observe the readings in Park and again in Drive. If the fuel pressure is low in Park, or you see the pressure drop off when you put it in Drive then it's either a plugged fuel filter, your fuel pump needs checking or that fuel pump module is trash.
if your fuel pressure looks good then you'll wanna start looking at your injectors.