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73-87 Chevy _ GMC Trucks => 73-87 Chevy & GMC Trucks => Topic started by: Walnut777 on April 16, 2019, 08:19:59 PM

Title: 81 scottsdale 305 auto installed oil pressure gauge where did i go wrong?
Post by: Walnut777 on April 16, 2019, 08:19:59 PM
I was installing gauges in my 81 c10 305. I removed the distributor cap marked the position. removed the distributor so i would have some room to install the fitting for the oil pressure gauge. Installed it the truck crunk up but it is misfiring. Now it wont start at all and blows sparks out of the carb. The distributor was put back in just like i took it out. The wires are in the right order. the wiring harnesses are plugged back into the distributor. I KNOW I read something somewhere about issues cranking when the 2 wire harness from the oil pressure switch was unplugged. maybe im wrong. It seems like I read when that harness is unhooked is causes some issue with the wire going to the electronic choke. I looked at a wiring diagram and i believe the truck has the electronic spark control module.
Title: Re: 81 scottsdale 305 auto installed oil pressure gauge where did i go wrong?
Post by: Irish_Alley on April 17, 2019, 08:11:26 AM
what did you mark? its important to mark were the rotor is and install it back to where it was found.
Title: Re: 81 scottsdale 305 auto installed oil pressure gauge where did i go wrong?
Post by: Walnut777 on April 17, 2019, 08:47:30 AM
i marked the distributor shaft and the block and rotor button.
Title: Re: 81 scottsdale 305 auto installed oil pressure gauge where did i go wrong?
Post by: zieg85 on April 17, 2019, 09:30:44 AM
More than likely you are 1 tooth off.  When you remove the distributor the gear rotates as you pull it up which rotates the oil pump rod.  If you dropped it back it with no problems it is a tooth off... Been there done that.
Title: Re: 81 scottsdale 305 auto installed oil pressure gauge where did i go wrong?
Post by: Walnut777 on April 17, 2019, 11:58:17 AM
I think I found the problem. I had a firing order diagram for my truck but I think it was wrong. it was showing plug wire 1 and 8 on the back of the distributor closest to the firewall. I checked on this forum and it shows 1 and 8 on the front of the distributor. when I get home. ill switch it around.
Title: Re: 81 scottsdale 305 auto installed oil pressure gauge where did i go wrong?
Post by: JohnnyPopper on April 17, 2019, 02:44:27 PM
Always Take Pictures!!  ::)
Title: Re: 81 scottsdale 305 auto installed oil pressure gauge where did i go wrong?
Post by: Captain Swampy on April 17, 2019, 08:02:48 PM
Bring the #1 cylinder to TDC on the compression stroke. Usually the rotor is pointing towards the front passenger side. 18436572
Title: Re: 81 scottsdale 305 auto installed oil pressure gauge where did i go wrong?
Post by: Walnut777 on April 29, 2019, 10:36:12 PM
Sorry so late with an update.
I had lost my paper showing where the wires go on the distributor.
I googled it and autozone was showing 8 and 1 in the front and it was under 81 c10.
After I sat back awhile. I thought that wasnt right. 8 and 1 were in the rear.
Found the correct firing order and fired right up.

Autozone had a Pontiac 305 listed from.what I could find searching.
Contacted them and the link was fixed.