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Pickups Chevrolet Silverado & GMC Sierra GMC Sierra: Problems & Solutions 
1492 messages, Last post on Oct 12, 2006 at 5:32 AM
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Replying to: mikec8 (Feb 03, 2006 3:38 pm) -David |
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Replying to: noobie1 (Feb 03, 2006 4:55 pm)
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Replying to: gmc2004crew (Dec 07, 2005 10:40 am) |
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Replying to: mikec8 (Feb 04, 2006 11:47 am) http://www.delphi.com/pdf/ppd/chsteer/str_evo.pdf http://www.asashop.org/autoinc/april2005/techtips.cfm and this at: http://findarticles.com/p/articles/mi_qa3707/is_200504/ai_n13499665 "Steering Shake IHAVE A 1998 GMC SUBURBAN 1500 4WD with the 5.7-liter engine. I recently put a new set of Goodyear Fortera HL tires on. This is when I noticed a shake in the steering wheel between 30 and 40 MPH. It doesn't happen all the time, but it can occur at any time and at any speed between 30 and 40 MPH. A mechanic and I ruled out the cause being a bad tire by swapping tires around, using known good tires and wheels. The mechanic subscribes to an online database/chat room for mechanics. After researching this site and asking questions, he narrowed the problem down to two likely causes, the EVO sensor (which I believe goes around the steering column under the dash) and an actuator valve at the power-steering pump that regulates pressure for the speed-sensitive steering. Neither of these corrected the problem. However, when the connector at the pump actuator is disconnected, the problem is gone. RANDALL COWAN Middle River, Maryland The steering-position sensor is used to tell the computer the position of the steering wheel and how fast the driver is turning the wheel. Based on that information and also on vehicle speed, it will vary the steering effort by controlling the bypass orifice to relieve powersteering-pump pressure. There are two likely conditions that will cause the system to malfunction - a lifted suspension or oversized tires with extreme rim offsets. Both of these will change the force to the steering gear and cause a hydraulic oscillation. In layman's terms, the steering wheel will shake. The easiest way to diagnose the problem is to apply the brakes on dry pavement and turn the wheel lock to lock (while the vehicle is stationary). If it takes some strong-arm work to move the steering wheel, then the pump pressure is not high enough. Correct that first and then look at some type of tuned hose that acts as an accumulator to dampen the hydraulic oscillation. A spiral-wound spring inside the pressure hose will help dampen the fluctuation of pressure. You should be able to find a local custom-hose builder to do it. You could also temporarily install stock-type and stock-size tires up front and drive the truck to see if the problem goes away, which would further help you isolate the source of your shaking. - K.F." You might, just as an experiment as suggested in the above, disconnect the electrical connector at the actuator (rear of the pump) to see if that eliminates the problem . If it does, you won't know if it's the actuator or the EVO sensor, but at least it puts you in the ballpark. Let us know how it turns out. -David
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| My battery went down (due to lack of driving)on my 96 GMC Sierra 1500 so hooked up the battery charger. When I did the Code Alarm activated and the speedometer needle bounced around. Once I shut the alarm off the speedometer is stuck on 100 MHP. Any ideas? | |
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Replying to: noobie1 (Feb 05, 2006 8:20 am) http://forums.vmag.com/suvtahyuk0301/messages/5078.html |
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| http://www.automotiveforums.com/t317059.html | |
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Replying to: 12run4 (Dec 17, 2005 11:11 pm)
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| My light has been on for awhile, I have has oversized 35" tires on my truck for years. Just recently, the light came on and stay on. The scanner was put on and it said that BOTH front wheel sensors were bad, after resetting in park and engine off, the right one kicked the light on immediately. Does anybody have any ideas on how to repair? I have been getting 2 stories about the sensors that they clip into the hub and the other that they are attached to the wheel hub and must be purchased as a whole unit. Help me out guys!!!! | |
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I have a 2004 GMC Sierra 4x4 with only 7,000 miles on it. Just after 6,000 miles, it began to show a really bad vibration/shudder when the brakes are applied. I brought it to the dealer who of course could find nothing wrong (typical excuse). Now when I lightly apply the brakes, the truck begins to shudder and it seems like 30 mph and under is the worst. It begins to shake and it gets so bad that that I can actually hear a knocking sound! It is an awful sound. I am not 100% sure that it could be warped rotors......and I would almost think it could be ABS, but no lights come on. The truck did sit in a garage for some time, like 5-6 months and there was some rust build up on the rotors that has since worn away and they are shiny. Can anyone offer some help on this, it must be fixed! Thanks! 
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