Last post on Oct 27, 2013 at 1:07 PM
You are in the GMC Safari & Chevy Astro
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GMC Safari, Chevrolet Astro, Van
#1738 of 1973 GMC Safari wont start after intake job, cleaned poppets.
Apr 02, 2008 (11:43 am)
I found a coolant leak on my 2001 Safari and I decided to chek it out. Found out it was the intake gaskets. I went ahead and took it apart to replace them and clean everything out. I used throttle body and intake cleaner on the injectors or poppets. When I put it back together, it would not start, only crank. Checked fuel pressure, had 56 psi and spark. Both present. I marked the distributor before taking it off and put it back together the same way. I also replaced the cap and rotor. I don't know what to do after this. I would appreciate some help on this issue.
#1739 of 1973 Re: GMC Safari wont start after intake job, cleaned poppets. [rene007]
Apr 02, 2008 (12:30 pm)
Did you take the injectors out one at a time to make sure you put them back in the right cylinders, and if memory serves me right those injector poppets are made of plastic and and that cleaner is probaly acetone and it melts plastic. I would pull a couple plugs and make sure it's getting fuel in the cylinders,see if plugs are wet from flooding because of maybe firing problem. Unless you damaged the injectors or maybe mixed them up there's no reason that it wouldn't start from replacing gasket. I would check to make sure everything was plugged back in by regoing through what I unpluged to take it apart you might have missed a plug that keeps it from starting.I know there is a few electrical connectors that have to be disconnected to remove that plenum. GOOD LUK DLM1954
Apr 02, 2008 (5:24 pm)
4.3 V6, 2003 Astro, any suggestion on how to increase the mpg?
#1741 of 1973 Re: Increase Gas Mileage? [flintlockdave]
Apr 02, 2008 (7:30 pm)
These 4.3 multi port vortecs get crapy milage all of them,I tried every thing to inprove mine and it wasn't until I replaced the injectors and nut kit myself to stop what was mostly fuel leaking I believe that I went from 13 to 14 to 19 to 20.When it was still under waranty I took it back time and time again over the milage and rough idle and they kept telling me that was the design. The nut kit which is the internal fuel lines under the plenum which are made of plastic with rubber o-rings start leaking fairly soon after you put a few thousand miles on them. Why their called a nut kit I have no idea, my theory the designer was a nut. After I redone mine it ran better than it did when I bought it. These vortecs run great but was a poor design because of the EGR valve problems and injector problems but they run like a 350. I've had very good luck with mine,I've pulled a bass boat all through the mountains in Tennesee with no problem whatsoever. DLM1954
#1742 of 1973 Re: GMC Safari wont start after intake job, cleaned poppets. [dlm1954]
Apr 03, 2008 (8:46 am)
Thanks for responding, you are the second person that suggests that it is a connector that is not plugged in, but I checked all of the connectors that I took off, I double checked and triple checked they were all plugged in. I checked the spark plugs to see if they were full of gas or at least smelled like gas and no nothing, my next step was to take the injector assembly out and plug it in to the connector and crank the engine to see if they are actually moving or clicking or at least doing something. Nothing happened, I checked power to the injetor at the connecto while cranking, and yes there is signal. My next guess was that since I cleaned the injectors by spraying that throttle body and intake cleaner at the poppets and then left the spider looking thing with the legs up over night, the carbon that dissolved went right into the injector and seized them. I am going to take a really expensive chance and replace the injectors and see what happens. Thanks for your help.
#1743 of 1973 Re: GMC Safari wont start after intake job, cleaned poppets. [rene007]
Apr 03, 2008 (2:44 pm)
I think I would check the injectors to, because most of those cleaners are fine for throttle body injectors but they have a metal jacket around them and I know those multi port poppets are made of plastic.there's actually not much to an injector in the first place it's just a solinoid type unit.,that opens and shuts with electrical current but I'm like you they probaly seized from the cleaner. dlm1954
#1744 of 1973 Re: Distributor Timing [dlm1954]
Apr 04, 2008 (9:39 am)
I finally got the van running. It turns out that my 2000 Safari has two timing marks on the timing cover, 90 degrees apart. When both timing marks on the harmonic balancer and the the timing marks on the cover line up piston one is TDC. The interest part was the distributor. There is an arrow on the distributor with a number 6, meaning six cylinder, located around 2 to 3 o'clock. The rotor has to be pointing at this mark when cylinder one is TDC. In order to make the rotor alien with this mark the rotor has to be pointing just clock wise of the hole were the bolt for the distibutor cap is located. When you drop the distributor in the gears will cause the rotor to rotate to the arrow with the 6 which is the alignment mark. I had my wife's friend who come to find out is part owner of a repair shop fax me the instructions. Runs good, have to stop one small oil leak, get it smogged, and it will be back on the road. Thanks for the help.
Apr 05, 2008 (10:49 pm)
I just finished getting my 2000 Safari running after putting in a rebuilt motor and transmission. I drove the van around the block, it runs great now, and then I put on the emergency brake. The pedal went straight to the floor. No resistance. I don't remember if the emergency brake pedal was always like this or not. The van sat in my garage for over a year. If it is a problem what could it be? I believe the van has self adjusting rear brakes, so how would you make an adjustment to the emergency brake?
It is amazing how much difference a new motor and transmission make. The van runs good and STRONG!!! When I had the smog test done on the van it barely registered. It is nice to have a good running van that is paid for.
If you have any advice on the emergency brake I would appreciate it.
#1746 of 1973 Re: Emergency Brake [keeshond2]
Apr 06, 2008 (8:49 am)
Sounds like a broken cable or the back brakes are so far out of ajustment the brake doesn't work. The back brakes on these Astros was always a major problem the self ajusters are useless, I always ajust mine manually every 3 to 6 months or your using the front brakes all the time. I've never had any luck trusting the self ajusters, and I have to back out of my driveway every day so if they work at all the back brakes would stay tight. DLM1954
#1747 of 1973 EMERGENCY BRAKE
Apr 06, 2008 (12:02 pm)
Also if ajusting the rear brakes manually does'nt cure your brake problem check cable if it's not broken there should be an adjustment by the rear wheels where it y's off to the wheels. I've always had to ajust mine manually or the rear brakes didn't work and I pull a bass boat through Tennesee and it can get pretty hairy trying to stop with just front brakes working coming down one of those hills; and most astros have not all I've seen have this problem. If you don't adjust the rear brakes manually they will not work properly. GOOD LUCK DLM1954