What's new
CK5
Register an account today to become a member! Once signed in, you'll be able to participate on this site by adding your own topics and posts, as well as connect with other members.

I feel really stupid, but I need help

76k5blazerr

76k5blazerr

Git-er-dun
 Premium
Joined
Nov 13, 2013
Posts
1,587
Reaction score
744
Location
North Carolina
Alright guys the other day i traded my car trailer that I had 500 bucks in for an 85 blazer, 305 4 speed, drove it home, ran great, it came with a bunch of tune up parts so last night i started with plugs and wires, super simple right. Well initially everything was right but then I decided to reroute the wires and somehow I crossed a few of them. But I didn't find that out until today when I fired the truck up to drive it, it cranked right up, I started to go around the block, I get about half a mile and realize something isn't right, truck is shaking and running bad, I figure it is just cold natured because I thought I had the wires right, then I go the rest of the way around the block, and head home because now i suspect crossed up wires. Go home and sure enough, several are crossed, keep in mind the truck was running, idling and everything up until I pulled it down the driveway to fix the wires, then i shut it off and fixed the wires. I go to crank it up and it cranks over slowly and then it will intermittently speed up to normal cranking speed then it will stop ad then it will go slowly again. Anyway, it wouldn't start. I squirt some brake clean down the carb and crank for a little and finally it catches, i hold it about 2000 rpm and rev it some, sounds ok, then I let off the gas and it dies abruptly, not like sputtering out, i took my foot off the pedal and its like boom stop. Anyway I quit there, figured i will check with y'all and try again tomorrow. Im almost suspecting a bent pushrod, what do y'all think?
 
Just because a part is new, doesn't mean it's working correctly. It's an easy trap to fall into, especially these days where the market is flooded with cheaply made products.
 
If it ran fine when you drove it home originally then start with the things you've replaced
Even try some of the old parts again to rule out a possibly bad new part.
Check simple things first and methodically check/replace one thing at a time
find tdc for #1 (watch your timing mark on the dampner) then pull the cap off the distributor and confirm the rotor is lined up w #1 plug wire on the cap.
 
Could you have accidently spun the dizzy cap when you were changing the wires retarding the timing?

DouBle check that all the wires are snapped on correctly, I've had a few that felt right but was not connected well when I double checked.

What kind of spark plugs did you use?
The heat range on the plugs could be different. I made that mistake once, ONCE.
 
sreidmx said:
Sounds like 4 and 7 are swapped.
Click to expand...
I'll double check again when I get home but I think they are right. The more I think about it I think th timing chain jumped. The truck bucked really bad a couple times when I was driving on the crossed wires.
 
I highly doubt it is the chain. Not trying to be a dick here, but it is a 95% chance it is something you did. It ran fine before you touched it, not?

Martin
 
Also keep in mind that anytime you are working near, or on top of, the engine that you run the risk of moving or bumping old brittle vacuum lines. It's possible that you might have a small vacuum leak now. Like everyone mentioned above, first start with replacing these "new" wires and plugs with the ones you drove home with. Then, if the truck still runs like crap then you may want to look into the possibility of a vacuum leak. That's my 2 cents...
 
82355 said:
I highly doubt it is the chain. Not trying to be a dick here, but it is a 95% chance it is something you did. It ran fine before you touched it, not?

Martin
Click to expand...
I am positive it is something I did, the thing is, right now when you try and crank the truck it sounds like the timing is just way off, you know what I mean? I think the chain may have jumped when the truck bucked badly when I was driving on the crossed wires? Also, to make sure I've got the firing order right, I'll ask y'all. So starting from the left of the small square piece that comes off the dizzy that the dizzy wires go to, it goes 21843657 around the cap
 
Well turns out the dizzy must have jumped a few teeth. I set the motor to top dead and the rotor was pointing the complete opposite direction it should have been, pulled it out and reset it and it fired up but I either still have to adjust the timing or the dizzy is 1 tooth off because it loped pretty hard like the timing was still off
 
Something strange going on here. Its not unusual for the dizzy to be pointing the exact opposite from where it should be when no. 1 is at top dead center.
That means that the motor is at the wrong TDC. If you pull the dizzy and reset it then, the motor will not run.
Plus, if the timing jumps that much, something major is wrong. The only thing I could think of that would let the dizzy jump 180 degrees would be if the roll pin sheared and the pieces caught half way around.

But then I would expect it to turn loose pretty quickly after it cranks.

But, as long as its running.........
 
Fordum said:
Something strange going on here. Its not unusual for the dizzy to be pointing the exact opposite from where it should be when no. 1 is at top dead center.
That means that the motor is at the wrong TDC. If you pull the dizzy and reset it then, the motor will not run.
Plus, if the timing jumps that much, something major is wrong. The only thing I could think of that would let the dizzy jump 180 degrees would be if the roll pin sheared and the pieces caught half way around.

But then I would expect it to turn loose pretty quickly after it cranks.

But, as long as its running.........
Click to expand...
I set the motor to TDC on no 1 and reset the dizzy and she ran great.
 
Fordum said:
Something strange going on here. Its not unusual for the dizzy to be pointing the exact opposite from where it should be when no. 1 is at top dead center.
That means that the motor is at the wrong TDC. If you pull the dizzy and reset it then, the motor will not run.
Plus, if the timing jumps that much, something major is wrong. The only thing I could think of that would let the dizzy jump 180 degrees would be if the roll pin sheared and the pieces caught half way around.

But then I would expect it to turn loose pretty quickly after it cranks.

But, as long as its running.........
Click to expand...

Or when who ever put a cam in it last, misaligned the timing marks.
 
Sounds more likely to me that he put the plugs on 180* off. If you have the engine at the wrong TDC then put the wires on (even in the right order) thinking you have it right, it'll be 180* off timing, right? Take the wires off, put them in the right spot/ order and everything is good.
76k5blazerr said:
I set the motor to TDC on no 1 and reset the dizzy and she ran great.
Click to expand...
I'm sure that once you were on the right TDC everything lined up just right and the plugs went on in the right spots. :)
 
You must log in or register to reply here.

Latest Posts

Top Bottom