RESOLVED: 3 weeks troubleshooting, still stuck

Valaas said:

I checked vacuum on each throttle body: All seem good, including the "suspects" #2 & 3! Needle oscillated wildly (as per your warning) but clearly shows good vacuum.
When measuring directly (not teed in) on the tubing feeding the MAP sensor, I'm down to practically atmospheric again.
Disconnected all hoses from the 3 into one fitting and measured vacuum on each body via its vacuum hose, good vacuum on all 3..
Pressurized the 3 into 1 fitting, no leak.
What witchcraft is at play here?

Click to expand...

Valaas said:

I checked vacuum on each throttle body: All seem good, including the "suspects" #2 & 3! Needle oscillated wildly (as per your warning) but clearly shows good vacuum.
When measuring directly (not teed in) on the tubing feeding the MAP sensor, I'm down to practically atmospheric again.
Disconnected all hoses from the 3 into one fitting and measured vacuum on each body via its vacuum hose, good vacuum on all 3..
Pressurized the 3 into 1 fitting, no leak.
What witchcraft is at play here?

Click to expand...

Valaas said:

I checked vacuum on each throttle body: All seem good, including the "suspects" #2 & 3! Needle oscillated wildly (as per your warning) but clearly shows good vacuum.
When measuring directly (not teed in) on the tubing feeding the MAP sensor, I'm down to practically atmospheric again.
Disconnected all hoses from the 3 into one fitting and measured vacuum on each body via its vacuum hose, good vacuum on all 3..
Pressurized the 3 into 1 fitting, no leak.
What witchcraft is at play here?

Click to expand...

wzuccarello said:

I had the same issue with intermittent misfires. I chased gremlins all over the engine for several weeks.
Turned out that lightly snug spade connections is definitely not tight enough.
When the ECU detects a momentary open connection on a coil it shuts the coil's power until the engine is stopped and re started.
Drove me nuts. Got code for coil 3 changed it then next start got code for 2 and 3.
About that time I came across several older posts about the loose coil wire issue .
I flattened the female connectors enough that they were hard to connect and then all the engine issues suddenly dissapeared!

Click to expand...

Rocket Scientist said:

I went through that too. Re-crimping the low voltage leads on the coils took care of it. Good thought ! His coil wires likely got moved around taking the valve cover off.

Click to expand...

wzuccarello said:

I had the same issue with intermittent misfires. I chased gremlins all over the engine for several weeks.
Turned out that lightly snug spade connections on the coils is definitely not tight enough.
When the ECU detects a momentary open connection on a coil it shuts the coil's power until the engine is stopped and re started.
Drove me nuts. Got code for coil 3 changed it then next start got code for 2 and 3.
About this time I ran across several old posts about this issue.
Tightened coil 2 and e and still didn't run exactly right until I dug down and did coil#1 .
After I flattened the female connectors enough that they were hard to connect then all the engine issues suddenly dissapeared!

Click to expand...

Pedro said:

Was the engine running fine.before you changed the cam chain.Could you be one tooth out on the cam timing. Did you use the triumph tool to hold the cams .The slack in the chain needs to be taken up on the none tensioner side with the crank sprocket or it can be out .

Click to expand...

Rocket Scientist said:

I went through that too. Re-crimping the low voltage leads on the coils took care of it. Good thought ! His coil wires likely got moved around taking the valve cover off.

Click to expand...