Last post on Oct 27, 2013 at 1:07 PM
You are in the GMC Safari & Chevy Astro
What is this discussion about?
GMC Safari, Chevrolet Astro, Van
#1625 of 1973 Re: dusty19-vibration... [richly917]
Jul 29, 2007 (6:45 pm)
I also have a 2000 Astro van with about 90K miles and has a similar problem. It has a vibration between 65 and 70 mph. The vibration has gotten worse over the last 6 months so I suspect that something is wearing out in the drive train. I had my mechanic check it and he balanced wheels and said that one tire took a lot of weight to balance but it did balance. Then I had him replace U-joints when that did not work. Then had him replace shocks. When that did not work mechanic said maybe rear wheel not fitting tightly to brake drum so replaced the drum. When that did not fix it I took van to Chevy Dealer. They said the tires were lousy and replaced tires. When that did not fix it they said the drive shaft must have been bent when mechanic changed U-joints so they replaced it. When that did not work they changed front brake rotors. (One rotor had bad spot on it so it needed changing.) The vibration persisted. Dealer took off my Yakima roof rack and put OEM shocks on the front and that did not fix it. Last time we test drove it we did so with chief tech and GM rep. Yup, vibration still there. The dealer says they have checked bearings, have put different wheels on the front, put vibration monitors on it and they still cannot figure out what the problem is. They really are trying to figure it out but still the vibration persists.
They have had the van on the lift several times and cannot see the vibration when the van is running on the lift at speed.
The dealer says that they also have a second Astro van with similar problem.
Any clues as to what else it could be? I suggested that they look at the pinion bearings in the rear.
#1626 of 1973 Re: dusty19-vibration... [astroknot]
Aug 16, 2007 (5:42 am)
We have a 2001 AWD Astro with about 90K with the same problem. We too have done everything (and spent a lot of money) but the problem is still there. Now a new problem has developed. When you apply the brakes SOMETIMES it seems to grab. Just had it back to the mechanic and we did an ABS test by getting up to 10-15 MPH and then slamming on the brakes. This recreated the brakes grabbing problems. So now we are being told that the vibration problem and the brake problem could be because the front wheel bearings need to be replaced. Can anyone give words of wisdom?
#1627 of 1973 No Brake lights
Aug 16, 2007 (6:33 am)
1995 Safari mileage 260000 has had brake switch replaced, all fuses OK, all bulbs replaced but the lights don't function as brake lights. Any suggestions appreciated
#1628 of 1973 Re: Bad Whining Coming from Front Drive Train on my AWD Astro [jferrantelli]
Aug 17, 2007 (11:46 am)
Joe from NY
I just started 2 weeks ago to get a similar whining comming from the front end of my 2000 GMC Safari. Doesn't appear to be a wheel bearing since the whining noise stays the same in a right or left turn. I have been using a thruway on/off ramp as my gage for that since you can do about 30-40MPH. Front and rear diff are full and the transfer case is full. Transmission was rebuilt less than 3000mi ago.
Did you find the source of the whining noise?
#1629 of 1973 91 Astro 4.3 surging
Sep 04, 2007 (1:06 pm)
91 4.3. Cold it will have hesitation, surging, then the check engine light will come on, and run better, but will have a slight bucking/surging at about 45 mph. On or off the gas a touch goes away. Just did a new rotor and cap (pretty well shot). Before, had a friend toss an OBD 1 on it. 042 code if I remember correctly. Electronic spark control I think it was. I'm leaning on getting a new ECM that comes off the distributer...the 3x4 inch or so flat thing mounted on the r/s behind the motor. Might try the junkyard for another, but does anyone know the year model that would interchange? I don't see much diff, but really don't know for sure..any help appreciated! Thanks, Robby
#1630 of 1973 Re: 91 Astro 4.3 surging [cbharobby]
Sep 04, 2007 (2:22 pm)
Did a little searching, and came up with a possibilty. Code 42 "The EST signal did not change when the ECM applied bypass voltage to the ignition module."....so where the heck do I go from here? Robby
#1631 of 1973 Astro/Safari front clip
Sep 04, 2007 (6:42 pm)
I have a 1994 Astro and I need to replace the Front Clip (Hood , Grill and fenders). Does anyone know if a Clip from the 1995 models up will fit? I like the 95 and up look over the 94 and down. I realize that there would be a little reworking of the radiator etc, but If i had a donor would it work?
Any input would be appreciated.
#1632 of 1973 My 1998 Safari is setting Code 175
Sep 09, 2007 (5:12 pm)
I have a 1998 GMC Safari that started setting off code 175 (right bank is running rich) a while back. My mechanic thought that I needed to replace the O2 sensor. I replaced all 3 ($128 x 3 + sales tax) and it did not set codes for a few weeks. The code is back again and I don't trust my mechanic to do further diagnostic work. I also don't trust most repair shops or dealerships but I am afraid that I will have to break down and take it in. Can anyone here recommend a repair shop or dealership in Houston, TX.
#1633 of 1973 Re: 87 astro Running Problems [rsj428]
Sep 16, 2007 (11:25 am)
I am having pretty much the same problems with my 92 safari awd. It will start and run fine but when you drive it stalls out. It then needs a bit of time to cool down.
Iv had a pressure test on the fuel pump, new fuel filter, new plugs, wires, coil, ignition modual, distriutor and rotor, but nothing has helped. Does any one have any ideas that could point me in the right direction please???
#1634 of 1973 Re: 87 astro Running Problems [burt7]
Sep 16, 2007 (2:00 pm)
I took my Safari in to an independent shop and they scanned it and said there was nothing wrong that it would set the code and then remove them within a few minutes, that it was an intermitent problem. Your problem is different than mine, I have no stalling problem and you have an OBD I emissions system and I have an OBD II system which operate differently. You need to take it to someone that can provoke the symptons and then fix it.