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Misfire on my TR


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Maybe this is normal behaviour, but would like to ask.

 

When engine is a bit cold, if I put my 'boot down' I get a misfire . . and when it warms up, it 90% of the time does not occur but generally I need to bring rev's up a bit before I can put my foot down hard. Any thoughts or should I just drive more like Miss Daisy?!

 

Rich

 

 

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When my car is cold, for the first mile or so, it needs a bit of enrichment to pull cleanly.

 

Once it is at all warm there is no hessitation from anything over 1500 revs.

 

Sounds like your’s needs a tune Rich?

I’d start with an ‘italian tuneup’ :-)

 

Steve

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One more thing, the pi has no ‘acceleration pump’ so if you actually do ‘floor’ the throttle it will go lean for a moment.

 

Is this what you mean ?

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Is it a P.I? They are awful when cold in my experience.

 

Likewise, the earlier TR6 engine had a higher revving cam and was less docile at low revs. Don't know what cam yours would have but the later ones were a bit more flexible at lower revs.

 

And, lecture time...you should never, ever put your 'boot down' on any cold engine. Only cane it when it is thoroughly warm (i.e., after several miles, not just because the temp gauge is up to its mark).

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And, lecture time...you should never, ever put your 'boot down' on any cold engine. Only cane it when it is thoroughly warm (i.e., after several miles, not just because the temp gauge is up to its mark).

Absolutely right Steve, i wait for the oil pressure to drop back a bit indicating warm oil before deploying the berries :-)

 

Steve

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Maybe this is normal behaviour, but would like to ask.

 

When engine is a bit cold, if I put my 'boot down' I get a misfire . . and when it warms up, it 90% of the time does not occur but generally I need to bring rev's up a bit before I can put my foot down hard. Any thoughts or should I just drive more like Miss Daisy?!

 

Rich

 

 

 

Mine does as well, I think when its cold and especially hasn't been driven for a while it stutters a bit. Probably the plugs foul up a bit to start with until it warms up properly.

Edited by DRD
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What state are the diaphragms inside the dash pots in? If they are perished or split replace them.

About a fiver each from Burlen http://zenithcarb.co.uk/carbspec/carburettor/spares/id/4072/

 

What state is the distributor in? Your car probably has a 'retarding' capsule on the distributor. Is it working correctly?

 

Italian Tune Up is a specialised and precise method used by very expensive workshops to 'clear out the cobwebs' of engines that have been driven sedately by their owners. ie They take it out for a thrash! It is alleged that this method is still in use to get the emission system working on cars that do only short around town slow speed journeys - you need to get the thing hot to light up the emission system apparently - so it probably gets driven along the motorway for 100km at the speed limit.

 

Peter W

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In a purely technical sense it means, and I'm quoting directly from the Motor Engineers' Manual here...."Ragging the sh*t out of it until either, a), it starts running right, or, b, it breaks.

Haha! what a wonderful saying . . I work with geeky engineers so will use that term and walk off to see if the get it :-)

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When I was a teenager my parents owned a PI saloon which would from time to time start misfiring after around town use. My dad was a mechanic and he would tell me to take it for a run along a nearby rural road and "thrash the pants off it" (maybe not his exact words) to clear the offending plug or whatever. When he was young he had worked with some Italians in Aussie, so I guess that's where he received the tuning advice. Always worked a treat :D

 

Gavin

Edited by KiwiTR6
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Back in the day that was the only servicing ever required on a Citroen SM that belonged to an old boy in the village where I lived at the time, the mechanics at the local garage used to take great delight in thrashing the life out of it on the local bypass.

Stuart.

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Back in the day that was the only servicing ever required on a Citroen SM that belonged to an old boy in the village where I lived at the time, the mechanics at the local garage used to take great delight in thrashing the life out of it on the local bypass.

Stuart.

 

:):):):)

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Its a carb version! Maybe good advice on a cold engine. Whats an Italian Tune up?!!!

I would check the coke adjustment, balance of carbs and mixture when the engine is hot, get your colour tune out. Before doing anything else.

 

Bruce.

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