Ian,
Based on the other responses, I'm hoping I'm not off base - but I'll
continue.
I had a similar problem with my TR6 prior to pulling it apart to do a frame
off. As I worked through the problem, I found first that my dashpots were
losing oil quicker than I felt they should. The piston valve was rising too
quickly when the throttle was blipped, causing the engine to stall and
stutter. Next, I found that the throttle bushings were allowing air past.
A trick to check this is to turn the car on, and spray carburetor cleaner
next to the throttle shaft a few times. If the engine stutters or stalls,
the throttle bushings are worn. Lastly, I found that my butterflies had
worn a little bit, and allowed air through, even when the butterflies should
have been closed - although this led to a high idling RPM, and not a
stutter.
Good luck!
Eric Conrad
Denver, CO
econrad@teal.csn.net
'76 TR6 -frame off continuing nicely. Just waiting to rebuild the hubs, and
then the wheels go back on the chassis. Then the fender$, exhau$t, engine
rea$$embly, body repair, paint, interior, $$$.
-----Original Message-----
From: owner-triumphs@autox.team.net [mailto:owner-triumphs@autox.team.net]
Sent: Monday, July 10, 2000 2:10 PM
To: triumphs@autox.team.net
Subject: TR6 intermittent miss
Esteemed Listers:
What causes a '76 TR6 to stumble while accelerating after warming up?
Here's the scenario:
* Car starts easily and warms to operating temperature normally (temp
gauge works fine).
* For the first 15 minutes or so, it runs almost perfectly (only very
occasionally do I feel a slight misfire as I accelerate)
* After about 15 minutes, or if I shut the car off and restart it, the
engine is considerably rougher, missing as I engage the clutch at lower
rpms. Even in the upper gears, if there is any load on the engine
(accelerating up hills, etc), it stumbles much more noticeably than it did
after just warming up. Accelerating through higher rpms, the problem seems
to go away, but the next time I accelerate from a red light, it stumbles
again.
* Bottom line: the problem is almost unnoticeable for the first 15
minutes or so after warming up regardless of rpms or engine loading. It's
very noticeable after that at lower rpms under load.
The engine is original with a legitimate 53,000 miles on it. Compression is
about 115 to 125. It has new plugs, condenser, points, plug wires and sport
coil. Valve guides leak a bit and the carbs leak dashpot oil (through what
I assume are bad O-rings). Timing and valve adj are per spec, but I opened
the plug gap to about .30 to take advantage of the sport coil
Anybody experience this before?
Thanks.
Ian
CF57345UO
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