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Old 01-23-2014, 10:28 AM
GondolaRides GondolaRides is offline
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fuel leak=low boost???

so, i have a fuel leak going into the head on the pass side, could this effect boost and power ?
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1997 f350 cclb, auto(blech), 4.10, 6637, 3" dp, lost kitty muffler ran away, egt/trans/boost gauge, PHP tunes, Bellowed up pipes
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Old 01-23-2014, 10:31 AM
GondolaRides GondolaRides is offline
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also on another note, when im in my highway gear at 70 or so under normal cruising throttle its as though i have "downshifted" and when I hit it, it feels like it shifts up/lower rpms... its like the exact opposite of what should be happening.
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Old 01-23-2014, 10:40 AM
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Originally Posted by GondolaRides View Post
so, i have a fuel leak going into the head on the pass side, could this effect boost and power ?
How bad is the leak? If it's really bad then I could see where it could cause a loss in power because you wouldn't build good pressure in that head, but that would have to be a pretty big leak.

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also on another note, when im in my highway gear at 70 or so under normal cruising throttle its as though i have "downshifted" and when I hit it, it feels like it shifts up/lower rpms... its like the exact opposite of what should be happening.
So you're saying that the truck feels like it goes into a lower gear or the Torque Converter unlocks when you're just trying to maintain constant speed? Is the OD light blinking or CEL on? What happens if you apply more throttle, does the TC lock up then?
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Old 01-23-2014, 10:56 AM
GondolaRides GondolaRides is offline
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od light isnt blinking and no cel... I guess im not familiar with what the TC unlocking would feel like. Its hard for me to describe other than to say what i did above... Would the TC locking lower my rpms as though it were shifting into a higher gear? that is what happens when i apply more throttle its like a shift but not quite as many rpms as that... sorry if im not making sense...
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Old 01-23-2014, 11:11 AM
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When the TC locks up it is more or less connecting the engine directly to the transmission. With it unlocked the engine drives the transmission but the TC allows them to be "uncoupled" because the fluid in the TC is what does the driving. What you should feel as you go up through the gears is the 1-2 upshift, the 2-3 upshift, then the TC lockup, then the 3-4(OD) upshift. You'll actually feel it kind of shift 4 times even though there are really only 3 gear changes because the TC locks between 3rd gear and overdrive. Does that make sense?

When the TC unlocks the engine kind of just free-wheels on deceleration and while it drives during acceleration, it isn't a direct connection. A locked TC feels more like a manual transmission.
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Old 01-23-2014, 11:51 AM
GondolaRides GondolaRides is offline
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yeah man, that makes sense. I would have to go road test it to give a for sure answer as far as exact number of shifts and report back. I am working today but ill post up when i get a shift count.
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Old 01-27-2014, 07:00 PM
GondolaRides GondolaRides is offline
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yeah, so took it out on the highway today and 3 gear changes only. when i step on it it feels like another "shift" which from what i gather is the TC engaging??? Im assuming i need a new one? is that indicative of a new tranny as well... also could that affect my milage driving around town?
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Old 01-28-2014, 07:58 AM
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When driving on the highway and you let off the throttle does the engine go down to nearly an idle or does it stay near the same speed?
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1997 F-350 7.3 PSD, 4x4, CCLB SRW, 3.55's, ZF5
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Old 01-28-2014, 09:50 PM
GondolaRides GondolaRides is offline
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id say it goes down 800 or so rpm... from what you are saying and what im feeling it seems as though its not going into OD?
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Old 01-29-2014, 07:56 AM
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It's really tough to troubleshoot this kind of thing without seeing it in person. If it is dropping 800 RPM when you let off the throttle it sounds as though the T/C isn't locking. I think I would suggest taking it to a transmission shop and having them take a look at it. You could always have them diagnose it and then bounce their diagnosis off the rest of the guys here on the boards.
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Old 01-29-2014, 07:56 AM
 
 
 
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