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What is this discussion about? GMC Sierra 1500, GMC Sierra 2500, GMC Sierra 3500, Truck

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#1065 of 1492 Re: 1994 GMC Sierra 1500 Failing Emissions...Low Idle Cyclical Stalling/Surging [jstrong] by canamguy Jun 17, 2005 (10:35 am)
Replying to: jstrong (May 16, 2005 7:02 am) I have a 1992 had the same problem and it is the EGR to a degree. What is happening is your eprom is signalling the vacuum to open and close the EGR at the wrong times and when it does this it cause the surging and stalling effect. Since emmission control here in northern NY is lax. rather than screw with the electronics. I simply unhooked the EGR. (plugged the hose) so the EGR stays shut. Your mpg will be a little lower dropped me from 17mpg to 15.5/16mpg. and occassionally the check engine light comes on. So unless NY state becomes stricter on emmissions, my truck will be running without the EGR hooked up. Runs like a Top, just uses a little more gas.
#1066 of 1492 HEI Distributor/Module problem by canamguy Jun 17, 2005 (10:53 am)
Over the past 6 months I've had a small starting issue with my 1992 Sierra ext cab 4x4. At first it was believed that it was a blown module on the HEI distributor. No biggy, $36 part, 15 minutes to change it. 2 weeks later.. No start again.. Figured.. ok.. must have gotten a defective module, was a 1 warranty part so took it back, replaced it and put the new one in and trucked ran fine.. roughly 2 weeks later.. same problem. At that point I decided to go with a higher end Module - different brand. warranty covered the blown module, payed the different.. $10.00 extra. Put in the better module.. went a good month then same problem. So.. getting frustrated I torn out the module to take it back.. then for s&g's I cleaned the dielectric grease off put fresh stuff on and stuck then module back on. Truck fired right up.. ran great for 2 - 3 weeks. then woulsdn't start. So I pulled the dist. cap off, lossened the screws on the module ( didn't take it off the dist though) tighened the screws back up. put the cap back on.. fired right up. It went a month, then we got some 90+ weather with nasty humidity and for 4 days straight every morning I had to pop the dist cap off, put it back together and it would start. As long as the truck didn't sit parked (not running) for more than 4-5 hours it would start just fine. But if it sat overnight, or while I was at work. I had to get out and tinker with it. The only conclussion we have come up with was a ground issue of some kind. So to test the theory I attached a ground wire from the underside if the dist ( attached the wire to the screw that mounts the module) to the firewall.. So far it's started without any problems. But I have a feeling that that ground wire isn't the solution and that it's something else causing it. But if it keeps starting with that extra ground wire..I'm good to go. Any Ideas anyone? Replies to this message: canamguy (Jun 29, 2005 3:29 am) iltski (Jul 09, 2005 12:20 am)
#1067 of 1492 Re: 1997 GMC sierra poor brake pedal feel [biffripjock] by weels Jun 18, 2005 (6:14 pm)
Replying to: biffripjock (Jun 17, 2005 10:13 am) HUH?
#1068 of 1492 Help 95 GMC steering column broke by dsessoms Jun 20, 2005 (1:29 pm)
I recently hit the ditch trying to miss a deer. The steering column in my truck now moves up and down. Being a do-it-yourself type person I took apart the dash to see what is broken or has came alose. There is a bracket on the column that has to V-shaped hooks that to triangle shape pieces hook into and the column then bolts to this. But I can not seem to get the column to come up enough to line this back up. Is there sometype of adjustment bolts somewhere I cant see or dont know about. Please help
#1069 of 1492 99 Sierra Shudder at 60-75MPH by mgomaize Jun 25, 2005 (4:49 pm)
Hello,   First post here. I have browsed the achives and have found a dizzying array of posts that seem somewhat related. I am hoping I can get some direct advice. I have a 99 GMC Sierra 5.3L Ext. Cab 4x4 that has developed what I would call a shudder that you can feel and hear, and especially feel in the pedal. It mainly happens acceleration in the 55-75 MPH range, sometimes lower. It is a bit out of alignment which I intend to take care of this week. I am hoping I can get a diagnosis on the shudder so I can decide if I can hadle it or so I can point a mechanic in the right direction.   Thanks,   Tony Replies to this message: weels (Jun 26, 2005 3:35 am)
#1070 of 1492 Re: 99 Sierra Shudder at 60-75MPH [mgomaize] by weels Jun 26, 2005 (3:35 am)
Replying to: mgomaize (Jun 25, 2005 4:49 pm) Our 98 tahoe did that and I eventually changed the rear u-joint out. The original really didn't look bad and I wasn't able to get any play in it by trying to move it by hand, but (knock on wood) after I swapped it out it's been good. I grease it every time I change the oil and right before any big road trips. -Good luck. - Tim
#1072 of 1492 Re: HEI Distributor/Module problem [canamguy] by canamguy Jun 29, 2005 (3:29 am)
Replying to: canamguy (Jun 17, 2005 10:53 am) The ground wire didn’t solve the problem. We’re having 90+ weather with humidity and it’s back to not starting when it sitts for more than 4 hours. I had it in to a GM dealer, at the time the truck wasn’t acting up so their “best guess” was the fuel pump relay. Not sure what the fuel pump relay has to do with it, but I put a new one in, didn’t fix the problem. Any idea’s anyone?
#1073 of 1492 Re: 99 GMC Sierra 1/2 Ton 2wd gurgling sounds [gmcproblems] by hockeydawg Jun 29, 2005 (6:18 am)
Replying to: gmcproblems (May 20, 2005 10:20 am) I posted a message on the same problems about a month or so ago and haven't gotten any responses. Let me know if you find anything out.   1) My noise occurs mostly at low speeds or low rpms in each gear. But I took everything loose out of the truck and checked for loose parts to rule out just a vibration. Still haven't isolated it. The dealer didn't know and was hesitant to start tearing things apart without a direction to go in cause the bill might grow big.   2) I looked up a few things on the internet about replacing the digital readout, but I'd have to tear it apart myself and send it in. They could have it replaced in less than a week. This is from an aftermarket installer..   Thanks.
#1074 of 1492 Re: 1997 GMC sierra poor brake pedal feel [biffripjock] by 97trk Jun 29, 2005 (8:47 am)
Replying to: biffripjock (Jun 17, 2005 10:13 am) My truck does not have hydroboost power brakes. It has a normal vacuum booster so the power steering fluid level has nothing to do with the brakes.

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