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1 yr out since new injectors...

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Old 12-05-2017, 05:49 AM
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1 yr out since new injectors...

A yr ago i had to replace all the injectors and went with the ryan casserly reman stock. I think she runs weak.. I even have the hypertech max energy on stage 3.
although she runs ok.. she seems low on power. The fuel pressure seems to indicate an issue. Sometimes the fuel pressure runs about 58psi and she runs and pulls strong.. but most of time the psi is about 64 and has lower power and hardly any black smoke if you stomp it.

any ideas?
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Old 12-05-2017, 06:09 AM
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Boots or up pipes possibly leaking?
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Old 12-05-2017, 06:31 AM
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What year is your truck? Automatic trany or stick?
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Old 12-05-2017, 09:04 AM
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Quote:
Originally Posted by afonda View Post
A yr ago i had to replace all the injectors and went with the ryan casserly reman stock. I think she runs weak.. I even have the hypertech max energy on stage 3.
although she runs ok.. she seems low on power. The fuel pressure seems to indicate an issue. Sometimes the fuel pressure runs about 58psi and she runs and pulls strong.. but most of time the psi is about 64 and has lower power and hardly any black smoke if you stomp it.

any ideas?
IIRC, 45-65 psi is the range for fuel pressure so you seem to be in the upper range. Where is your fuel pressure sensor pre or post filter? How many miles on the truck? Do you have a cat on your exhaust? My truck had a cat and with 360K, turns out it was plugged. Removed it...completely different animal now.
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Old 12-05-2017, 01:13 PM
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Originally Posted by Colorado350 View Post
IIRC, 45-65 psi is the range for fuel pressure so you seem to be in the upper range. Where is your fuel pressure sensor pre or post filter? How many miles on the truck? Do you have a cat on your exhaust? My truck had a cat and with 360K, turns out it was plugged. Removed it...completely different animal now.
I think it's pre filter.
280k miles.
no cat, 4" mbrp exhaust...
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Old 12-05-2017, 01:16 PM
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Theory...

Higher fuel press could mean injectors not flowing (sucking) fuel. Seems like when the fuel pressure is lower, I get more power and can see visibly more black smoke. This theory would point towards injectors not firing, injectors with low flow, or something of the like...
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Old 12-05-2017, 01:51 PM
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Quote:
Originally Posted by afonda View Post
Higher fuel press could mean injectors not flowing (sucking) fuel. Seems like when the fuel pressure is lower, I get more power and can see visibly more black smoke. This theory would point towards injectors not firing, injectors with low flow, or something of the like...
I would think that the fuel pressure regulator (FPR) would/should keep fuel pressure steady, injectors taking it or not, except when there are sudden changes in demand, then I'd expect a short fluctuation.
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Old 12-05-2017, 03:08 PM
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The fuel regulator is a back pressure regulator.
They operate by returning the excess fuel to the tank.
If your pressure is bouncing above 60 psig, it might be a regulator issue.
If you pressure is dropping below 55, you may have a supply issue.
Are all of you filters clean?
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Old 12-05-2017, 03:25 PM
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Have you done the Hutch and Harpooon mods?
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Old 12-05-2017, 11:36 PM
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Check your fuel filter condition (any black?) and also look carefully at the bottom of your fuel bowl. That is where the sand-like debris accumulates.

How about your air filter minder? It might be time to change?

How old/miles and what brand/weight of oil?
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Old 12-06-2017, 02:15 AM
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Engine Oil Temperature makes a difference. If a lot of your driving is short hops in the winter, the same symptoms would be expected because of lower fuel temp and the tune being dialed back until the engine temp gets way up there. If you're in a warmer climate, disregard.
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Old 12-06-2017, 05:45 AM
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Quote:
Originally Posted by ExPACamper View Post
Check your fuel filter condition (any black?) and also look carefully at the bottom of your fuel bowl. That is where the sand-like debris accumulates.

How about your air filter minder? It might be time to change?

How old/miles and what brand/weight of oil?
I completely disassembled cleaner and rebuilt the fuel bowl last summer. Plus new fuel line seals.
brand new oil change.
could prob use a new air filter.. but it looks clean.
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Old 12-06-2017, 05:47 AM
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Have you done the Hutch and Harpooon mods?
no.. but the tank was dropped last fall and all was good.
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Old 12-06-2017, 05:49 AM
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Originally Posted by Tugly View Post
Engine Oil Temperature makes a difference. If a lot of your driving is short hops in the winter, the same symptoms would be expected because of lower fuel temp and the tune being dialed back until the engine temp gets way up there. If you're in a warmer climate, disregard.
I didn't know the tune would be affected by ambient temp..
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Old 12-06-2017, 05:55 AM
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Quote:
Originally Posted by Karlow View Post
The fuel regulator is a back pressure regulator.
They operate by returning the excess fuel to the tank.
If your pressure is bouncing above 60 psig, it might be a regulator issue.
If you pressure is dropping below 55, you may have a supply issue.
Are all of you filters clean?
The in tank filters were checked and cleaned last fall. New fuel bowl filter last summer.. not many miles since then..
at idle fuel psi is pretty steady at 64, it drops into the mid/upper 50's under accel
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