crank no start

nickb2

Wrench. Diagnostic Tech.
Joined
Nov 22, 2008
Messages
8,470
Likes
134
Points
63
Location
St-Hyacinthe, Quebec, Canada
#31
If all plugs out, no reason for engine drag or starter kick back.



.
So, at the beginning of this an oil line broke
Bill, I don't think I need to go through the hassle of converting audio to a youtube.

That sounds like a engine that is seizing.

Three starters later, that engine is toast. Don't even need to go further. The audio provided by the OP is sketchy, but quite clear.

To save that engine, it is going to take a lot more than another starter. I think the timing jumped, and if that happened on a 4.3l like this. Remove engine.

Evaluate truck,
 
Last edited:

billr

wrench
Staff member
Joined
Mar 12, 2007
Messages
6,043
Likes
60
Points
48
#33
OK, both Dan and Nick have indicated cranking isn't quite right, even with the plugs out; and it certainly seems that spark timing is off, for whatever reason.

It is time to quit looking for "magic bullets" outside the engine and start looking inside. Removing valve-covers, oil pan, timing cover, or intake manifold are all *relatively* easy ways to get some clues to what has happened in there. I would start with the easiest, the valve-covers.
 
Joined
Mar 1, 2002
Messages
3,401
Likes
43
Points
48
Location
Kentucky
#34
Before recommending any major surgery, I would like more questions answered...
Is the starter NEW or "new"?
Is the distributor cap new? Is it the "flat-top crab" kind? They are tricky!
What was the procedure that "has been checked several times" to determine distributor shaft position?
 
Last edited:

billr

wrench
Staff member
Joined
Mar 12, 2007
Messages
6,043
Likes
60
Points
48
#35
Yeah, I keep hinting about a timing light being needed to verify spark is too far advanced...
 
Joined
Dec 28, 2017
Messages
8
Likes
0
Points
1
Age
65
#36
with no plugs sounded normal here. definately no kickback. kickback only occurred with all connected. have new starter. am gonna do the 3 crank tests again but do the best i can at recording to get it to you guys.
will try to determine exact spark timing with each cylinder. will have valve covers off and watch for smooth movement.
am thinking i can see a more precise timing with plugs out.? will still work ok.?

note: plugs have been dry.
seems as tho its ready to start at anytime with starter fluid, but wont crank long enough.
has complete new distributer. checked for number 1 rotor position 2-3 times. and number 1 spark with light several times

weather, time, permitting will report back asap dont wait up

thanks all
 
Joined
Mar 1, 2002
Messages
3,401
Likes
43
Points
48
Location
Kentucky
#37
Because there is some unfound problem somewhere, I will ask about rotor position. Are you clear on the fact that when engine is "at number one", the rotor is actually pointing to a position that is close to where the #2 and #4 wires attach to the cap?
Sometimes, a defective NEW cap of this design can cause crazy and unexpected spark problems.
 
Joined
Mar 1, 2002
Messages
3,401
Likes
43
Points
48
Location
Kentucky
#38
To determine "engine on compression stroke for cylinder #1", I usually remove spark plug #1 and stuff a paper wad into top of spark plug hole. Then I "bump" crank the engine until the wad "pops"out. At that point the rotor should be pointing "in the general direction" of #1 position at the distributor. You should be able to turn the crank pulley bolt a short distance to line up the timing marks, and rotor should still be close to #1 position.