95 Blazer wont start

[1990blackgt]

OK.... Here's the story. I have a 95 Blazer with a Vortec w/160k miles on it. The thermostat went bad, and I overheated the motor, and the cyl heads warped slightly. I had the heads checked and .005 was needed to make them straight again. after re-installing everything, when I tried to fire it up, the fuel pump went bad.

SOO.... I finally replaced the fuel pump and sending unit (sending unit cracked upon removal) and the pump works. But when cranking the motor over it was acting like the battery was low....... Hooked up a charger...... no difference...... Bought a new battery...... same. Turned the lights off in my shop to check for spark (I have spark), and noticed the Ground strap from the motor to the battery sparking. It was loose. After tightening, It still cranks slow, and every once in a while acts like it may start, but never does.

Sorry for the lenghty post, but I wanted to give you guru's all the info up front. I'm really at my wits end with this truck and have a TON of money into this problem already. PLEASE HELP!!!!

[old_master]

Does the starter crank the engine at normal speed and it won't start? Or does it just crank slowly?

[1990blackgt]

Originally Posted by old_master

Does the starter crank the engine at normal speed and it won't start? Or does it just crank slowly?

it cranks slowly. once in a blue it will crank at normal speed for a few seconds.

[old_master]

Disable the ignition coil and see if it cranks at normal speed.

[1990blackgt]

Originally Posted by old_master

Disable the ignition coil and see if it cranks at normal speed.

OK, disable it by unplugging the coil from the harness? or unplugging the coil wire?

[old_master]

Safer to unplug the harness connector from the coil.

[1990blackgt]

Originally Posted by 1990blackgt

OK, disable it by unplugging the coil from the harness? or unplugging the coil wire?

OK..... I unplugged the coil, and it cranked at normal speed.... did I fry the coil or something?

[old_master]

Nope. It appears that you may have installed the distributor incorrectly. Do you have a shop manual that explains how to install it? The crankshaft must be at TDC compression stroke for number 1 cylinder. When the distrubutor is installed and fully seated, the rotor must point at the mark on the distributor that is stamped "6". Pictures are always a good thing, http://files.automotiveforums.com/ga...hp?photo=51302


You can take the distributor cap off, bump the starter until the rotor lines up with the "6", then make sure the index mark on the crankshaft is on TDC. If it's not, the distributor is not in there correctly, and you'll have to start from scratch. If it is lined up, the distributor is probably off 180 degrees.

Don't forget to plug the coil back in

[brownbeaver]

go with the "Old Master" he's right

[1990blackgt]

Originally Posted by brownbeaver

go with the "Old Master" he's right

In another post I was questioning where the "V" mark was. I later found it, lined it up with the mark on the crank after my finger was blown off the #1 spark plug hole. I installed the rotor pointing to the 6 on the distributor housing.

Is it still possible for the dist. to be out 180?

Thanks for your replies Old Master.

[old_master]

When you had your finger over the #1 hole and hit the starter, every other puff should feel stronger, that is the compression stroke. The weaker puff is the exhaust stroke. Gotta pay close attention to the puffs. Are you sure you have it right? What I've found that works for me, is disable the coil, hold a finger tightly over the spark plug hole and run the starter. As the engine is turning over, notice the strong puff for a couple of engine revolutions, then time it so you shut the starter off when the strong puff hits. Then rotate the crank by hand to TDC. Takes a little practice to get it right.

[1990blackgt]

Originally Posted by old_master

When you had your finger over the #1 hole and hit the starter, every other puff should feel stronger, that is the compression stroke. The weaker puff is the exhaust stroke. Gotta pay close attention to the puffs. Are you sure you have it right? What I've found that works for me, is disable the coil, hold a fingertightly over the spark plug hole and run the starter. As the engine is turning over, notice the strong puff for a couple of engine revolutions, then time it so you shut the starter off when the strong puff hits. Takes a little practice to get it right.

I could have the mistaken The exhaust stroke for the intake stroke. I'm working alone, and was turning the crank by hand. I'll go out right now and try it again.

[old_master]

Check the second paragraph of post #8.

[1990blackgt]

Originally Posted by old_master

Check the second paragraph of post #8.

Thanks. Is it possible to reverse the rotor 180 instead of taking the dist. out?

[old_master]

Nope.