Brought to you in part by:

.

Tools and Supplies at Eastwood

  Mustangsandmore Forums
  '64 1/2 to '73 -- The Classic Mustang
  help diagnos a 1973 302 'miss'

Post New Topic  Post A Reply
profile | register | preferences | faq | search

UBBFriend: Email This Page to Someone! next newest topic | next oldest topic
Author Topic:   help diagnos a 1973 302 'miss'
46and2
Gearhead

Posts: 224
From: Kentucky
Registered: Nov 99

posted 12-04-2001 09:40 PM     Click Here to See the Profile for 46and2     Edit/Delete Message   Reply w/Quote
I have a miss in my 1973 drop top with a 302 2V. It is at idle almost all of the time (it will hesistate from time to time during acceleration...not often though). It really acts like it might have water in the gas but I am not so sure anymore. I want to know any and all reasons that you all can come up with on why it would miss at idle and then smooth out when you accelerate or rev it up. Even if the reason is stupid, go ahead and say it...I will narrow down the choices later.

Anybody know where I can get a gasket for the gas cap on my 1973?? I can narrow down the 'water in the gas' option if I can get a new gasket or 'rig' it up so it has a like new gasket on it. I really don't want to have to buy a whole new cap.

------------------
'73 drop top Stang - '90 Ford F-150 4x4 - '78 Ford F-150
'95 Mercury Cougar V8 -'83 Mercury Marquis
'89 JEEP Cherokee - '79 JEEP Wagoneer
'71 Scout 4x4
http://clubs.yahoo.com/clubs/convertiblesclub
http://clubs.yahoo.com/clubs/jeepshotspot
http://www.mild2wild.org

IP: Logged

Fastback68
Gearhead

Posts: 874
From: Sucat, Paranaque, Philippines
Registered: Jul 99

posted 12-04-2001 10:30 PM     Click Here to See the Profile for Fastback68   Click Here to Email Fastback68     Edit/Delete Message   Reply w/Quote
If it's bad gas, that problem should disappear in time. I wouldn't think it's your gas cap. Have you got one of those tiny filters in your fuel line that screws into the carb? That would be worth checking, along with any other fuel filters.
Simon

IP: Logged

SuperDave
Gearhead

Posts: 118
From: Tacoma, WA USA
Registered: Jun 2000

posted 12-05-2001 12:03 AM     Click Here to See the Profile for SuperDave   Click Here to Email SuperDave     Edit/Delete Message   Reply w/Quote
If it is an idle only miss I strongly suspect the idle air bleeds in the carburetor are out of adjustment. They're the two small screws under the float bowl on the front of your carburetor. Could also be that the ignition points are burned or improperly gapped. If the points are bad, the car probably is missing slightly at all RPM but you just don't feel it.

IP: Logged

46and2
Gearhead

Posts: 224
From: Kentucky
Registered: Nov 99

posted 12-05-2001 04:48 PM     Click Here to See the Profile for 46and2     Edit/Delete Message   Reply w/Quote
thanks for the ideas. I am going to see about a gasket for the gas tank and if the miss doesn't go away I will try other options.

The reason I think it is water in the gas is because the miss is inconsistant. It doesn't happen on a certain cylinder or in some kind of rythm...it just dies out with no ignition and then the next cylinder runs like nothing happened. Or the worst case is when it dies sometimes.

------------------
'73 drop top Stang - '90 Ford F-150 4x4 - '78 Ford F-150
'95 Mercury Cougar V8 -'83 Mercury Marquis
'89 JEEP Cherokee - '79 JEEP Wagoneer
'71 Scout 4x4
http://clubs.yahoo.com/clubs/convertiblesclub
http://clubs.yahoo.com/clubs/jeepshotspot
http://www.mild2wild.org

IP: Logged

74merc
Gearhead

Posts: 731
From: Demopolis AL
Registered: Jun 99

posted 12-06-2001 01:25 PM     Click Here to See the Profile for 74merc   Click Here to Email 74merc     Edit/Delete Message   Reply w/Quote
sounds like the condensor to me, thats exactly what mine did while it was going out...
on both of my cars...
intermittant(sp) misses, then occasionally just cut off.
does it do it while its cold?
could be water, could be points, could be condensor, coil, crappy dist cap, wires bundled together misfiring...

IP: Logged

franklin
Gearhead

Posts: 128
From: VA
Registered: Nov 2000

posted 12-06-2001 03:09 PM     Click Here to See the Profile for franklin     Edit/Delete Message   Reply w/Quote
While you are in the dist, grab the rotor and wiggle it and see if there is alot of slop in the dist bushings. Also take a look at the plate the points bolt to and see if it has alot of play in it.

IP: Logged

46and2
Gearhead

Posts: 224
From: Kentucky
Registered: Nov 99

posted 12-06-2001 05:14 PM     Click Here to See the Profile for 46and2     Edit/Delete Message   Reply w/Quote
when you said condensor that rang a bell. I need to find a free minute and seal up that gas cap...even though the gasket doesn't look bad. I bet it isn't water in the gas but I can't be sure till I can get a better gasket on there.

Keep me posted on whatever else you guys think it might be...

------------------
'73 drop top Stang - '90 Ford F-150 4x4 - '78 Ford F-150
'95 Mercury Cougar V8 -'83 Mercury Marquis
'89 JEEP Cherokee - '79 JEEP Wagoneer
'71 Scout 4x4
http://clubs.yahoo.com/clubs/convertiblesclub
http://clubs.yahoo.com/clubs/jeepshotspot
http://www.mild2wild.org

IP: Logged

46and2
Gearhead

Posts: 224
From: Kentucky
Registered: Nov 99

posted 12-10-2001 12:25 PM     Click Here to See the Profile for 46and2     Edit/Delete Message   Reply w/Quote
ok...now it won't start. It is about 40 degrees outside and it is turning with plenty of speed and is trying to turn over but won't. I have flooded it out twice and it just can't get started. I have elimenated water in the gas...so are we talking condensor or bad points??

------------------
'73 drop top Stang - '90 Ford F-150 4x4 - '78 Ford F-150
'95 Mercury Cougar V8 -'83 Mercury Marquis
'89 JEEP Cherokee - '79 JEEP Wagoneer
'71 Scout 4x4
http://clubs.yahoo.com/clubs/convertiblesclub
http://clubs.yahoo.com/clubs/jeepshotspot
http://www.mild2wild.org

IP: Logged

franklin
Gearhead

Posts: 128
From: VA
Registered: Nov 2000

posted 12-10-2001 03:04 PM     Click Here to See the Profile for franklin     Edit/Delete Message   Reply w/Quote
Don't try to figure out which it is, replace both, and also the plugs, the dist cap, rotor, and if you can afford it, the coil. If the sparkplug wires are ancient, replace them too. There is no use messing around with it till you burn up your starter, and wash down the cylinder walls with gasoline.

IP: Logged

46and2
Gearhead

Posts: 224
From: Kentucky
Registered: Nov 99

posted 12-10-2001 05:04 PM     Click Here to See the Profile for 46and2     Edit/Delete Message   Reply w/Quote
new wires, plugs and coil.

I will get a new cap and maybe some new points but i haven't a clue what is involved with that. Probably a condensor too

------------------
'73 drop top Stang - '90 Ford F-150 4x4 - '78 Ford F-150
'95 Mercury Cougar V8 -'83 Mercury Marquis
'89 JEEP Cherokee - '79 JEEP Wagoneer
'71 Scout 4x4
http://clubs.yahoo.com/clubs/convertiblesclub
http://clubs.yahoo.com/clubs/jeepshotspot
http://www.mild2wild.org

IP: Logged

All times are ET (US)

next newest topic | next oldest topic

Administrative Options: Close Topic | Archive/Move | Delete Topic
Post New Topic  Post A Reply
Hop to:

Contact Us | Mustangsandmore Front Page

Copyright 2002, Steve LaRiviere


Ultimate Bulletin Board 5.47d

Amazon Honor System Click Here to Pay Learn More

[Where are the M&M Members From?]

[Build a free Mustangsandmore.ws Home Page!]

[About M&M][Acronym Guide][Calendar of Events][Chat Room][Classified Ads] [Links]

[Members' Photos] [M&M Mug Shots] [Technical Articles][Ford Parts Number Deciphering

[ Mustangsandmore.com Bookstore] [Advertise on Mustangsandmore.com] [Mustangsandmore.com T-Shirts]