Technical Intermittent missfire and rough cold start

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Technical Intermittent missfire and rough cold start

Tiller

New member
Joined
Mar 29, 2014
Messages
15
This is a problem i have with my Fiat 850 (849cc) 1971.
I did a engine rebuild last winter, and last year it ran smooth without problems.
I started having problems with intermittent missfire very spontaneous and i also noticed that starting it after standing utside during nighttime was difficult.
What are the places to start looking for faults?

I can drive for longer periodes without problems, so this is a very intermittent problem.
these parts are new since the rebuild:
Coil
Spark plugs and cables
Condensator
Rotor
Point
Distributor cap
 
Joined
Oct 8, 2012
Messages
466
This is a problem i have with my Fiat 850 (849cc) 1971.
I did a engine rebuild last winter, and last year it ran smooth without problems.
I started having problems with intermittent missfire very spontaneous and i also noticed that starting it after standing utside during nighttime was difficult.
What are the places to start looking for faults?

I can drive for longer periodes without problems, so this is a very intermittent problem.
these parts are new since the rebuild:
Coil
Spark plugs and cables
Condensator
Rotor
Point
Distributor cap
Check your fuel supply - pump ok, filters clean, no dirt in carburettor?
 

timmycm850

Active member
Joined
Feb 28, 2016
Messages
586
Please describe the engine rebuild, in the parts replaced.

How old is the fuel in the car.

Tim
 

FR85

Member
Joined
Jan 15, 2020
Messages
133
Location
Kildare
They will be hard to start if it's cold out, I recently changed my oil from Miller's M50 to Halfords 20w50 and it's made a huge difference to cranking on the first start of the day.
Also, it's take a few cranks to fill the bowl in the carb so they can be slow to start if left lying for a week or so.
 
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