Chugging/Surging between 1,000-1,300 RPM

i put 4k springs in my 96 and at 1000 rpm the the engine runs up to 2000 and the only way to stop it is to let off the fuel any ideas?
 
Do some searching...
If that doesnt work loosent the springs up some.
 
Did you get a chance to adjust fuel pressure? 160 pumps (applicable if your 1995 is an auto) are especially susceptible to problems if your fuel pressure is low. You may find Big Blue's results in his Junker thread will verify this. He found that his ran far better when supplied with 50 psi (if memory serves correctly). I cannot recall exactly where I set mine, but I think it was right around there and I generally only surge when I need a fuel filter change and I'm really light pedalling it- like after it shifts into third driving slow through my neighborhood.
U
 
daveinwyoming said:
Did you get a chance to adjust fuel pressure? 160 pumps (applicable if your 1995 is an auto) are especially susceptible to problems if your fuel pressure is low. You may find Big Blue's results in his Junker thread will verify this. He found that his ran far better when supplied with 50 psi (if memory serves correctly). I cannot recall exactly where I set mine, but I think it was right around there and I generally only surge when I need a fuel filter change and I'm really light pedalling it- like after it shifts into third driving slow through my neighborhood.
U
Click to expand...

Nope, haven't really had time to mess with the truck. It sucks driving around base and through my neighborhood at 25-30 mph in 3rd gear (like you mentioned).

My wife and I are finally getting close to being done with unpacking so hopefully I'll have some free time soon. Maybe Monday since I don't have class. I'm gonna start by maxing out the TorkTek OFV, then maybe throw the factory OFV back in after I mod it.
 
Last edited:
Just a little something. I went ahead on something most might not condone of and racked my barrels at home. However I did so with good results. The chug my truck had is 99% gone. Huge difference from how it was acting. Just figured I would throw that out there.
 
BRE said:
Just a little something. I went ahead on something most might not condone of and racked my barrels at home. However I did so with good results. The chug my truck had is 99% gone. Huge difference from how it was acting. Just figured I would throw that out there.
Click to expand...

If adjusting my fuel pressure doesn't help I might have to go this route as well. My HX35 is already hating life, no reason more fuel can be any worse, right? LOL Plus, my drive to work is about 1.5 miles these days. I can ride a bicycle if racking the barrels turns out horribly wrong!
 
Bringing this back to the top....

The chugging gets 100x worse once the trans fluid gets any warmth to it at all. When it was 30-40* in the mornings this winter the truck wouldn't chug/shudder/shake at any RPM, speed, or load conditions. Once it was warmed up though, it would be right back to the usual symptoms.

Now that it's 50-60* in the mornings it'll act up all the time, but still not to the same severity as it does when the trans is registering ~160* on the gauge.

To recap the symptoms: Horrible bucking/shaking/chugging between 1000-1300 RPM. Under VERY light throttle the truck will end up in 3rd gear at around 20-25 mph. Then with light/moderate pedal increase the chugging will set in. BUT, I can make the bucking stop completely if I manually downshift into 2nd while still maintaining the exact throttle position. Same thing happens if I have it in OD around 45 mph and click it into 3rd, no more issues.

Also, having the TC locked makes no difference in it's behavior. It'll still buck/chug if the RPM's are low for the vehicle's speed.

Please help!
 
npe3484 said:
Bringing this back to the top....

The chugging gets 100x worse once the trans fluid gets any warmth to it at all. When it was 30-40* in the mornings this winter the truck wouldn't chug/shudder/shake at any RPM, speed, or load conditions. Once it was warmed up though, it would be right back to the usual symptoms.

Now that it's 50-60* in the mornings it'll act up all the time, but still not to the same severity as it does when the trans is registering ~160* on the gauge.

To recap the symptoms: Horrible bucking/shaking/chugging between 1000-1300 RPM. Under VERY light throttle the truck will end up in 3rd gear at around 20-25 mph. Then with light/moderate pedal increase the chugging will set in. BUT, I can make the bucking stop completely if I manually downshift into 2nd while still maintaining the exact throttle position. Same thing happens if I have it in OD around 45 mph and click it into 3rd, no more issues.
Click to expand...

My truck does the exact same thing. Has been driving me crazy ever since I owned it.

'95 12v/nv4500 5.014 SDX Injectors, 0 plate ff, 3k gsk (at initial), exhaust, bhaf. Stock timing, afc settings etc.

Put that tork tek thing in there and bumped up lift pressure a bunch. No improvement whatsoever.
 
I have what sounds similar. I only noticed it after I converted to an auto. It did the bucking before with the manual but I learned how to drive around that. I think it's governor bounce?. Makes it sorta lopey when trying to maintain a slow speed in second gear. I just goose it a little and it goes away. I'm gonna try adjusting the governor some to see if I can get rid of it
 
agree with Youngguns. Sounds like governor bounce.

Put a legitamate set of governor springs in and adjust them properly. I would bet your problem would go away.

I've got the same problem with a set 5 K springs and an auto tranny street driving the truck with 4.88 gears. There isn't enough torque load on the truck at cruising speeds to keep the governor fly weights stable. they unload, dropping fueling then with drop in torque attempt to maintain speed/torque and load back up again. It's like riding a buck'in bronco sometimes.
 
If it were the governor springs why would it act so much better when the ambient temp is low?
 
I had this problem when I pulled a gooseneck load of round bales. My starwheel was all the way loose so I had all fuel and no air. If you modded the afc all the way put the afc full back and the starwheel half way in the hole and see how it runs.
 
You must log in or register to reply here.
Back
Top