[T2] Power loss in 4th

[Avocado Tom Tarka]

And the culprit turns out to be a stuck float needle valve in the carb.

Put my spare engine in with the same carb and ignition system as the engine with the helicoil.  

Tried warming up the engine with the car sitting in the driveway and found the same behavior as before: that it stalled when it was warmed up, regardless of whether it was moving or not.

Glad to have finally tracked it down, annoyed it took me so long.

Cheers,
   Tom

----
 "We are MoTown. We are professionals. We're here to get the job done."

> On May 17, 2016, at 4:47 PM, Avocado Tom Tarka <avocadotom at gmail.com> wrote:
> 
> Honestly, the engine is out at this point so I'm just going to tear it down and throw a new head on it.  Want to check the rings as well.
> 
> ----
> "We are MoTown. We are professionals. We're here to get the job done."
> 
>> On May 16, 2016, at 5:15 PM, Jamie <jrivers at globalserve.net> wrote:
>> 
>> well.. I really don't think the spark plug is your issue... when they loose compression,, you know it!  because the go BANG! then puff air in and out..
>> otherwise the spark plug was still in place,, hot or cold.. it was still sparking,, and there would be no loss of compression,, but if there was loss of compression,, you would have heard it leaking past the plug like a big whistle.. or squirrel,, or chipmunk....... from my experience anyway....
>> 
>> if the helicoil came out neatly.. you can insert another in the same threads..  what I find is the ones that come out were not installed deep enough and the plug tightened on the coil before it hit the head... if it was a helicoil insert.. and it came out..... i dunno
>> 
>> so , pop in a new helicoil,, and do your compression checks again... heat up the engine till it looses power ,, and do a compression test again...
>> while you're checking the compression,, check the valve lash too...  use a VAC gauge on the manifold ,,
>> and if you have hyd lifters... make sure they are rock hard and not squishy
>> 
>> good luck!
>> Jamie
>> 
>> ----- Original Message ----- From: "Avocado Tom Tarka"
>> 
>> Jamie,
>> 
>> I think you were close with this, but I believe it was actually a bad helicoil someone put in the #3 spark plug hole: as soon as it got hot enough, it would lose compression and power.
>> 
>> Helicoil came out when I was trying to do another hot compression test.
>> 
>> 
>> On Oct 31, 2015, at 4:18 PM, Jamie <jrivers at globalserve.net> wrote:
>> 
>>>>> John Rogers  wrote:
>>>>> 
>>>>> I am still convinced until proven otherwise that this is a case of
>>>>> pre-ignition. It has all the symptoms -- starts fine, runs OK until warm,
>>>>> then loss of power.
>>> 
>>> 
>>> my wild ass guess is ... dropped valve seat...... the seat is in place till the head warms up,, then starts to rattle around and cause all kinds of issues.
>>> best way to find out.. use a VAC gauge on the manifold ... when you see that needle flicker ,, sigh,, you will know ..
>>> you might  run some hose to the dash so you can watch it while driving , if it doesn't act up as soon as you put the gauge on.
>>