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Username Post: 96 C1500 Engine Surges On Highway        (Topic#225197)
Rednexed 
Forum Newbie
Posts: 8

Reg: 09-02-09
09-04-09 09:55 AM - Post#1766257    

i have a problem with this truck I just bought. When I am giving it light acceleration it stumbles, I notice it most on the highway. If I am coasting or barely giving it gas the truck jerks like I am lugging in to high of a gear. I replaced the fuel filter and air filter, the fuel pump is new. I do need a new battery but its got enough to start and run the truck. It reminds me of a tracker I had once that had a TPS problem cause it only happens when the pedeal is pressed a certain way. If I drive it like hell no problem. What do you guys think? I notice it most around 2k rpm. And some times it dont happen at all. then when it does its pretty constant unless i stick my foot in it.


 
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Rednexed 
Forum Newbie
Posts: 8

Reg: 09-02-09
09-04-09 09:56 AM - Post#1766258    
    In response to Rednexed

oh yea I have run 2 full tanks one with lucas an one with chemtool. What will make this truck sputter?

 
355Cheyenne 
Senior Member
Posts: 3765
355Cheyenne
Loc: Northern MN
Reg: 10-27-04
09-04-09 10:00 AM - Post#1766262    
    In response to Rednexed

ses light on?
98 Silverado k1500 4x4 350


 
someotherguy 
Moderator
Posts: 25749
someotherguy
Age: 44
Loc: Texas
Reg: 08-01-03
09-04-09 10:10 AM - Post#1766268    
    In response to 355Cheyenne

If you really believe you need a new battery, get one. I've seen lots of problems caused by running a weak battery. If the problem is still there afterwards, at least you're on more solid ground for troubleshooting.

Richard
94 C2500LD / 97 Suburban LS1 / 06 300C SRT8
Check out my truck shop projects


 
Rednexed 
Forum Newbie
Posts: 8

Reg: 09-02-09
09-07-09 11:56 AM - Post#1767678    
    In response to someotherguy

No lights of any kind are on, I did replace the battery and still have the same problems. I have noticed that it happens most arouns 2k rpms and the only time I can say that it dosent happen is under heavy acceleration.

 
stumppuller 
"4th Year" Gold Supporting Member
Posts: 556

Loc: Canada
Reg: 11-01-04
09-07-09 03:03 PM - Post#1767787    
    In response to Rednexed

You might want to try running 2 cans of throttle body cleaner through the motor (while it is running), as well as the port for the IAC motor. I have solved some similar idle problems in the past on MPFI motors doing this.

The inside of the throttle body and plenum passages get covered in a black gunk over time (from the EGR I think), and can cause idle/stumbling problems.
-91 Sierra C2500, now K2500
-81 Chev K20


 
355Cheyenne 
Senior Member
Posts: 3765
355Cheyenne
Loc: Northern MN
Reg: 10-27-04
09-07-09 07:58 PM - Post#1767971    
    In response to Rednexed

96 C1500, guessing it is a 350? I would have to believe that anything that could cause surging or drop offs would cause an SES or code, but ah well.

since you aren't getting a code, I am thinking fuel pressure issues. I would recommend you find out what PSI you are getting from the fuel rail with a pressure tester.

Tom
98 Silverado k1500 4x4 350


Edited by 355Cheyenne on 09-07-09 08:02 PM. Reason for edit: No reason given.

 
Rednexed 
Forum Newbie
Posts: 8

Reg: 09-02-09
09-08-09 11:51 AM - Post#1768242    
    In response to 355Cheyenne

whoops I appologize I have the 4.3 vortec. I have now replaced the TPS and the plug wires truck runs alittle better but this problem still persists. So I fog the motor huh? I was wanting to do that as soon as I got some more cash any way. Ill try that and get back to you guys.



 
Rednexed 
Forum Newbie
Posts: 8

Reg: 09-02-09
09-08-09 11:52 AM - Post#1768245    
    In response to Rednexed

oh yea and its not an idling problem it actualy idles perfectly, it happens more in the 2000 rpm range. normaly under light acceleration

 
355Cheyenne 
Senior Member
Posts: 3765
355Cheyenne
Loc: Northern MN
Reg: 10-27-04
09-08-09 02:19 PM - Post#1768337    
    In response to Rednexed

I am not an expert with the v6 motors but I think you have a vortec v6 with similar injection to the v8 counterpart. Everyone here says DONT fog or run cleaner down the throttle body on the v8 vortecs because they build up a lot of crud in the intake runners and you don't want all that broken loose because it will cause a lot more trouble. you could try running sea foam in the fuel. I would wait for clarification as to if it is safe or not to dump down the throttle body. I just don't want you to make it worse.

does it just bog? does it miss fire or back fire? how does it start? (does it take a couple tries?)

you could try a fuel filter, cheap and should be done every now and then anyway. I still want to know what PSI your pump is putting out.
Tom
98 Silverado k1500 4x4 350


Edited by 355Cheyenne on 09-08-09 02:22 PM. Reason for edit: No reason given.

 
Rednexed 
Forum Newbie
Posts: 8

Reg: 09-02-09
09-12-09 12:42 PM - Post#1770689    
    In response to 355Cheyenne

It starts right away. no problems there at all. In fact there are no problems with the idle either, the fuel filter and pump are new, and I cant reproduce the problem at all for the first 5 to 10 miniutes of driving only after the truck is warmed up. It happens in all gears right at 2k but not when I am accelerating, only when trying to maintain speed. Lets say 70 mph, but will happen at any speed when the engine gets to 2000 rpms. As soon as I get my foot in it plenty of smooth power, no back fires or deiseling when the key is turned off, an the truck runs really good other than this. I would blame it on the tranny if it werent the 5 speed manual. The rpms dont actually change at at not even slightly just kinda stutters the whole truck. reminds me of a fuel problem but then the problem would worsen when i gave it more fuel not go away.

 
Joe327 
Senior Member
Posts: 601

Loc: NE Florida
Reg: 03-27-00
09-13-09 04:28 AM - Post#1770978    
    In response to Rednexed

I had the same exact problem with my 97 Silverado 4.3 V-6. Did everything new fuel pump, fuel filter, cap & rotor, wires, plugs, battery, ect. Ran perfect in every way except at a steady part throttle in 4th gear at 40mph & up i would still get random misfires! Now at my wit's end I went to Autozone and got a fuel pressure tester, the fuel pressure was perfect but as I blipped the throttle I happened to be looking at my top of my engine with a very bright flashlight and I saw the fuel lines moving! I pointed the flashlight at the upper plastic intake plenum and it looked like it was breathing, the vacuum at idle sucked down the entire top of the manifold and when I blipped the throttle it popped right back up at least a 3/8 of an inch! Replaced it ($65) and lo and behold the problem is gone. I'm pretty sure that upper intake plenum being spider cracked and moving upset the MAF sensor enough which in turn sent erroneous data to the engine computer and it made the engine hick up. Hope this helps...
"A wise man's heart directs him towards the right, but a foolish man's heart directs him towards the left." Ecclesiastes 10:2


 
Rednexed 
Forum Newbie
Posts: 8

Reg: 09-02-09
09-17-09 08:14 PM - Post#1773871    
    In response to Joe327

I noticed today that its fine if its not driving, sittin in the parkin lot I could blow the motor up and it would be smooth the whole time.

 
JeremyB 
Senior Member
Posts: 703
JeremyB
Reg: 10-31-01
09-18-09 04:07 AM - Post#1773959    
    In response to Rednexed

Would you say it happens more often at 40mph and higher? If it does you might want to look at your distributor gear and see if it is worn.

 
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