scottwetzel Posted August 5, 2015 Share Posted August 5, 2015 Our other truck is also a 88 superliner 350 e6. It doesn't have the same speed as it used to and doesn't seem as powerful as before. It's been rebuilt once about 3 years ago. It just started acting up. Idles fine just doesn't seem to have power on acell or at top end. I've searched but haven't really found anything. Any ideas? Quote Link to comment Share on other sites More sharing options...
Dirtymilkman Posted August 5, 2015 Share Posted August 5, 2015 Puffer can go bad on them causing pump rack not to open fully. Quote Link to comment Share on other sites More sharing options...
scottwetzel Posted August 5, 2015 Author Share Posted August 5, 2015 Puffer can go bad on them causing pump rack not to open fully.How do you inspect or replace it? Quote Link to comment Share on other sites More sharing options...
Dirtymilkman Posted August 5, 2015 Share Posted August 5, 2015 Theres a air line that runs to the puff limiter on the injector pump. When you release the parking brake it will apply air pressure to the puffer to keep the rack from opening until theres boost. Take off the airline and unscrew the puffer out of the injector pump. Pinch off the airline so it wont leak when you release the parking brake. Go for a drive. The air line on the puffer comes from the reversing relay which is on the intake manifold on the other side of the engine. When your engine starts to build boost the reversing relay takes air pressure off of the puff limiter. The relay or puff limiter can be bad. I usually replace both. 1 Quote Link to comment Share on other sites More sharing options...
theakerstwo Posted August 5, 2015 Share Posted August 5, 2015 If its a 88 it may have the LDA (afc) diaphragm on the top of the governor which it gets boost to get full rack.Pump it up to 25 psi with a hand pump to see if its leaking. Quote glenn akers Link to comment Share on other sites More sharing options...
gearhead204 Posted August 5, 2015 Share Posted August 5, 2015 aldso check your manifold pressure if puff limiter checks out the charge air cooler may have broke a seam or tubes also check all boots on the cooler Quote Link to comment Share on other sites More sharing options...
Lmackattack Posted August 5, 2015 Share Posted August 5, 2015 Look for simple things first ... Replace fuel filter, check that the throttle lever has not slipped around the pump shaft, make sure it has full travel...if that's good check for good boost pressure. inspect turbo for broken fins. After that you will need to start looking at the pump and compression levels... 2 Quote Link to comment Share on other sites More sharing options...
Full Floater Posted August 7, 2015 Share Posted August 7, 2015 Does anyone have a picture of the puffer? just so I know what im looking at? Quote Link to comment Share on other sites More sharing options...
RSD501 Posted August 7, 2015 Share Posted August 7, 2015 Look for simple things first ... Replace fuel filter, check that the throttle lever has not slipped around the pump shaft, make sure it has full travel...if that's good check for good boost pressure. inspect turbo for broken fins. After that you will need to start looking at the pump and compression levels...My '89 had no power, ran up to about 1750 RPM slowly, and no boost. As he said, check the throttle linkage. The splines on the shaft going into the injector pump are gone on mine. Put the linkage back in the correct spot, ran a 1/4" bolt through it, and whammo... Mechanic wanted to send the pump out and that would have been $4,000 Quote Link to comment Share on other sites More sharing options...
Full Floater Posted August 10, 2015 Share Posted August 10, 2015 So here is a picture of my pump. (Dirty, I know) On the back of the pump, there is what looks to be a make spade electrical connector with a nut under it, with nothing attached to the connector. And to the left of the throttle arm, there is a set screw with a locking nut, is that the fuel delivery adjustment screw? And that is a picture with my throttle to the floor in the cab....is that about the angle they are when wide open usually? I can push it a bit further, but not much.This engine is an EM6 300. Quote Link to comment Share on other sites More sharing options...
Full Floater Posted August 13, 2015 Share Posted August 13, 2015 Is that spade a part of the "puffer"? Quote Link to comment Share on other sites More sharing options...
e9500v8 Posted August 13, 2015 Share Posted August 13, 2015 That spade terminal is dynatard switch puffer is on the front top of pump Quote Link to comment Share on other sites More sharing options...
gearhead204 Posted August 13, 2015 Share Posted August 13, 2015 scott, look at the picture that full floater posted, you see the throttle arm where the throttle linkage attaches? then look about 2 inches below the connection, do you see the cresent shaped rectangular slot with the metal tab in the center of it. now have some one mash the throttle pedal all the way to the stop bolt under the pedal,now did you see any movement in that cresent shaped slot? if not you need to adjust your linkage. either at the pedal or on the pump splines. that sloted opening allows for overtravel of the throttle pedal once the rail has reached its internal stop in the pump. when properly set the tab inside the cresent should move slightly as full throttle is reached at the pedal stop. hope this helps. Rob Quote Link to comment Share on other sites More sharing options...
felicello122 Posted August 15, 2015 Share Posted August 15, 2015 That adjuster bolt/screw is to set your idle, loosen the jam nut and you can raise or lower your idle speed, fuel adjustments are under that square cover. 1 Quote Link to comment Share on other sites More sharing options...
scottwetzel Posted August 16, 2015 Author Share Posted August 16, 2015 So I found the problem. When pushing the fuel pedal to the floor the return spring was not allowing the linkage to fully open. Went to lowes and got some springs. Replaced and she's back to her old self. Thanks fellas. Quote Link to comment Share on other sites More sharing options...
j hancock Posted August 16, 2015 Share Posted August 16, 2015 WHAT??? You fixed the truck using hardware store parts? Pretty nice when you don't need a wiring schematic and a scan tool. 1 Quote JimIt doesn't cost anything to pay attention. Link to comment Share on other sites More sharing options...
scottwetzel Posted August 16, 2015 Author Share Posted August 16, 2015 Why yes... Yes I did. Lol. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.