Help I cant get my gn to start!!!!!!

[Buickcruiser]

Hey guys
I am about ready to go crazy. I can’t figure out why my 84 GN won’t start. I just got done installing new head gaskets, 50 lb injector, a new fuel regulator from kirbian, and a turbo tweek chip. I am getting a spark using a sparkplug tester. The injectors are showing 12 using a voltmeter. The fuel pressure gauge is showing 20 psi no mater how I adjust it. I have also tested the cam and crank sensor. When I start to crank it the digital gauges do down and it barely cranks. I have even replaced the battery and it starts to crank for a couple of times and now it is doing the same thing. Even when I am jumping it with my truck. I don’t know what else to do any help would be greatly appreciated.
Thanks
David

 

[cool 84]

Have you moved the cam sensor for any reason? I had mine do what yours is doing. The engine tries to fight the starter motor.

The only other thing I can think of is maybe the ground that goes to the AC bracket isn't tight.

Make sure you have the right chip, I've heard of people getting the wrong chip shipped to them before. It's for the 50s, right?

Also, the injectors will have 12v to them whenever the key is on. They're triggered by the computer grounding them. You can put a small lightbulb like the kind used for dash lights in the injector socket and crank it over to see if they flash.

 

[Buickcruiser]

thank Cool 84 I will try a light bulb tomarow
so far I have
Hey guys
I tried several things today I checked both of the pins on the ecm going to the computer they were fine. The ground wire is secure between the ac bracket to the engine. This might be a different location compared to the 86/87s. I went to check the crank sensor it self and I am not receiving a signal from the B terminal when cranking the engine. Could that be what’s wrong ? I have always been under the impression that if the crank sensor is not working the engine wont spark. But mine is??? I tried both my original 84 ecm/computer and the 87 with the new turbotweek 50 lb. chip both had the same results.
I also connected my turbolink with 84 ecm the key turned there are no codes but when I cranked it the first time I get Codes 14 Cts Voltage high, 34 MAF MAP sen low, 35 IAC error, 41Cam sen failure ,42EST monitor line failure ,43ESC Knock control failure ,44 Exhaust lean, 45rich ,51Incorect prom check sum, 52 Bad or missing cal pack, 55 ECM A/D converter failure 53 water injection failure. None of the codes last more then a frame or two. The second crank It just showed 54 fuel pump voltage low, 55 ECM a/d Converter failure . agin none last the only way I could tell was from reviewing saved data.
Then I swiched to the 87 Ecm/ computer and received. codes 25 mat sensor voltage high ,31 waste gate pulses absent,32 EGR diagnostic circuit ,33maf mat high ,34maf map low,35iac idle speed error,41cam sensor failure ,42 EST monitor line failure. Again the don’t last but a frame or two. I also noticed that the batter voltage dropped to 6 when I was trying to start it.
Also the cam sensor is set right according to the cam set tool.
When reviewing the codes in turbolink I noticed that most had something to do with the ecm, prom, cal pack and or the ignition module Does that sound like a possibility if so how can you check them. Is this my computer or the thing under the coil pack.
So any ideas??????????????????????????????????
Sorry for the long post but I really want to get this thing running again.
Thanks
David

 

[Buick From Hell]

Originally posted by cool 84
Have you moved the cam sensor for any reason? I had mine do what yours is doing. The engine tries to fight the starter motor.

Even though the cam sensor is supposed to be set correctly, this is my first thought as to why it's hard to crank over, been there myself too...There's an easy way to see if this is the problem: Just turn the cam sensor slightly (about the distance of the diameter of a cam sensor cap screwhead, see the attachment) in the same direction the rotor normally turns (umm, which way IS that?? I forget, someone help me!)--IF the sensor was too far ahead, you'll know immediately as it should fire right up!

The only other thing I can think of is a pure-electrical problem, such as you have a bad ground as Cool84 noted; a bad starter thats dragging real bad, or you may have one of the ECM wires grounded somewhere ( look for a pinched wire between a header and head for example) that's causing the ECM to go into fits when you apply voltage...

try the cam sensor trick

ATTACHMENT

 

[racemybuick]

I am leaning toward the ignition module as the culpret. I have a 4.3 v-6 jimmy with a distributor, but on my way up interstate 80, the truck just completely stopped running. I had no injector pulse, no spark, no nothing. I bought an ohm meter, and a easy scan tool that checks computer codes, and it only told the code 12 (engine not running). DUH!!!... SO I swapped out the distributor (only a week after I replaced everything under the hood but), and still no spark. I then referred to a couple mannuals I had lying around, and the injector pulse, spark, timing, all go through the damn ignition module. I figured that since I bought a brand new distributor ($135.00), that the module would be brand new also.... NOPE...all reman. So, I put my original distributor back in with a new module ($35.00), advanced the timing a lil bit by accident, but the damn thing fired up first turn!!! I corrected the timing, and three weeks later, that Jimmy is haulin ass up 80, and all over!!!

Make sure you have an ohm meter for under the hood. look for juice comin out of the module. That is my best guess, other than maybe a draw from somewhere in the back of the car, ie the fuel pump... got a hot wire pump?

Good luck!!!

John

 

[Buickcruiser]

Posted for other people with a similar problem. It was the crank sensor it needed to be adjusted.
Thanks
David