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Discussion Starter #1
84 6cyl, new carb just passed smog, TFI ignition -
Good spark good coil and full tune up

RUNS GREAT on sunny days

CLOUDY OR RAINY barely starts and when it does we have 80% power loss under load..
Why would it run good on sunny days and bad on cloudy/rainy Days???????
Please help me!!!
Its there a dense air sensor or something like a Mass air flow sensor (doesnt have)!!?!?!?
Help me!
AMBER-
 

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Discussion Starter #3
Runs BAD when Rains or Cloudy days!!

Steve83 said:
Does it have a feedback carb?

From the diargram u have posted it appears that i DO have a feed back carb.
the digram posted is LESS complicated than the one i have bolted on.
Its a holly carb single barrel and brand new re-build -
Is there a SENSOR or something that can read MOISTURE and/or DENSE AIR?
Runs GREAT when SUNNY and CLEAR OUT
VERY POOR when CLOUDY AND RAINY!! Hard start and 80% power loss!!
HELP!!!
Thanks for all your replys!! ANYONE HAVE AN IDEA???????:cry
 

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will post results

thanks steve, gonna go and pick out 3 or 4 map sensors from pick and pull tommrow and see what happens. 2.00$ for 3 possibly good map sensors anit a bad deal. but yeah last step i will do is get a code reader and go from threre
new o2 senors so must be map yeah????
Sorry for the double post steve!
 

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map sensor - - - -

Yeah i hear ya - i was told that any map sensor will work as long as its is PRE 1990's and below even if its just a full size ford truck - is this true?
does it matter if i have a inline 6cyl and pull a map off of a v8??
for 2 bucks at pick and pull ill try it be for i spend 106 bucks on a brand new after market yeah???
84 bronco 4.9l inline 6cyl
If its NOT the map sensor any other ideas??

Thank you VERY much for your help steve!!
 

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Re check your secondary ignition, bad cap? Spray things down with a water and alcohol mix to make the problem happen when you are working on it.
 
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