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S10 "Jerks" while driving


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desertdawg70's Avatar
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March 29th, 2010, 2:15 PM   #1  
S10 "Jerks" while driving

Ok guys, I have about given up. Here is the deal. My 2002 Chevy s10 crew cab, 140,000 miles, "jerks", or thats the best way to describe it, while I am driving, almost exclusively at high speed. It's almost as though is loses complete power , but only for a spilt second. I have replaced the fuel pump last year and the injectors the year before. My mileage is now around 200-225 per tank, which is well below the 300 or so I usually get. I was told that the problem was the spider injector system, so i replaced them 2 years back, and it solved the problem until about 3 months ago. Supposedly the injectors leak some fuel, cause the "jerk". The injector system is about 300 bucks, so I am dreading replacing them again, only to have them start to go out. I have no idea what's wrong, but I do know that my O2 sensors are going off again, and I occasionally get the code that says my gas cap isnt on tight, when it is. Has anyone ran into this "jerking" before? I am wondering if it is the injectors, or if something else is causing the injectors to go bad.
I will be checking back often, and I am taking the truck to have the codes read again tonight.

Thanks, and let me know if you need any other information.

 
MDTAHOE's Avatar
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March 29th, 2010, 9:22 PM   #2  
What is the condition of the plugs and wires?

 
desertdawg70's Avatar
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March 30th, 2010, 10:11 AM   #3  
MDTAHOE-
The plugs and wires have about 25,000 miles on them. Also, I should note, that the jerks can be anywhere from 5 minutes apart to 15 minutes apart, and sometimes never.

 
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April 8th, 2010, 2:39 PM   #4  
the tps can also cause a jerk or surge like this under a load and certain rpm but i would say maybe the coil or coil wire? maybe its arching on something? loosing all the spark to the cylinders for that split second.

 
desertdawg70's Avatar
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April 9th, 2010, 8:55 AM   #5  
Thanks Redbull,

I will check the TPS this afternoon, but how do i check the coil?
Also, I noticed that its getting tougher and tougher to start the truck cold now. 3,4,5 times to get it started. I also noticed while driving home from Columbus last night, while I am going uphill the RPMs will spike sporadically 2-300 RPM, I can hear it in the engine, see it on the tach, but my I can't "feel" my speed picking up. I know its happening, but it might be normal. I have been trying to pay more attention to the truck itself, so i am starting to notice things I normally don't.

 
MDTAHOE's Avatar
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April 9th, 2010, 5:56 PM   #6  
You may want to look into the fuel pressure

 
2000sdime's Avatar
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April 10th, 2010, 6:34 AM   #7  
^^^^^^^ yup cuz i think mine throws a code about the fuel pressure and it does the rpm thing you were talkin bout but not as bad

 
elaw2004's Avatar
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July 31st, 2010, 8:57 PM   #8  
about Spider Injection System

i have the same problem with my 97 Blazer,, anyways ur guys input has helped me alot on deciding to get rid of my headache and trade it in, i did find the Spider Injection System for alot cheaper though, u can get it for 189.00 at a site called JustFuelInjectors.com hope this helps.

 
babe s-10's Avatar
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October 4th, 2010, 5:53 PM   #9  
S-10 Jerks

Amazing! My 2002 s-10 is doing the same thing (see post 9-13-10). In your experience what should I do next? You say you are getting codes...which ones?

Thanks

Babe s-10

 
Kash Ybeink Henderson's Avatar
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September 10th, 2013, 9:47 PM   #10  
Fixed

Changed tps and fuel filter problem solved no more jerking .....had changed spark plugs, wires, coil pack, cleaned throttle body no change runs like a dream now

 
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