302 chugs
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Junior User
Joined: Nov 2001
Posts: 51
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From: Edon USA
302 chugs
hello, i have a 302 in a '90 f 150. when you drive it in town it tends to chug. i first discovered that a plug wired was off. that took care of the major chugging. but when you coast through town at 35 mph or so it tends to chug. i didn't know if i had a u - joint going out or something but i first suspected the motor if anything.
it also hammers if you pull i relly big load and go down hill with and take your foot off the gas. anything you can tell me will be appreciated.
thanks,
57_F600
Keep 'Em Crankin'
it also hammers if you pull i relly big load and go down hill with and take your foot off the gas. anything you can tell me will be appreciated.
thanks,
57_F600
Keep 'Em Crankin'
Posting Guru
Joined: Jan 2001
Posts: 2,357
Likes: 3
From: S. Mississippi
302 chugs
It sounds like you may have an ignition problem, if the plug wires rotor and cap are new, then i'd look elsewhere, unless the pickup inside the dizzy is going south, and it will cause this too... intermittent jerking. A U joint shouldn't jerk unless you remove your foot from the gas and then get back on it... hope this helps!
Senior User
Joined: Mar 2001
Posts: 112
Likes: 0
From: South St. Paul, MN
302 chugs
Check for fouled plugs they can do some strange things.
1979 F150 Custom 2wd C4 302 painted ford blue, bored .040 over, flat top pistons with valve reliefs, Edelbrock Performer cam, carb, and intake, stock heads til next spring, MSD Ready-To-Run distributor, MSD Blaster 2 coil, Edelbrock air cleaner and valve covers, Dynomax headers, dual exhaust with Flowmaster 40 Series mufflers, 38 gallon fuel tank(how i can drive it further than around the block) 9" rear end with 2.75 gears and open diff to change to 3.50s and locker next spring.
"Your only as fast as me until the light turns green"
1979 F150 Custom 2wd C4 302 painted ford blue, bored .040 over, flat top pistons with valve reliefs, Edelbrock Performer cam, carb, and intake, stock heads til next spring, MSD Ready-To-Run distributor, MSD Blaster 2 coil, Edelbrock air cleaner and valve covers, Dynomax headers, dual exhaust with Flowmaster 40 Series mufflers, 38 gallon fuel tank(how i can drive it further than around the block) 9" rear end with 2.75 gears and open diff to change to 3.50s and locker next spring.
"Your only as fast as me until the light turns green"
Thread Starter
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Junior User
Joined: Nov 2001
Posts: 51
Likes: 0
From: Edon USA
302 chugs
hello,
if i go around a curve and let off the gas and then hit the gas again as i come out of the curve it chugs when i hit the gas again and then let off to coast. is this a u joint?
thanks,
57_F600
Keep 'Em Crankin'
if i go around a curve and let off the gas and then hit the gas again as i come out of the curve it chugs when i hit the gas again and then let off to coast. is this a u joint?
thanks,
57_F600
Keep 'Em Crankin'
Thread Starter
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Junior User
Joined: Nov 2001
Posts: 51
Likes: 0
From: Edon USA
302 chugs
hello,
i meant to say clunk. the truck seems to jerk when you push the gas, and then let, and then push it again. it feels like when you are going down hill and you have a load hammering on the truck. this happens when there is no load there. thus, it is worse when i do pull a load. what do you think now?
thabks,
57_F600
Keep 'Em Crankin'
i meant to say clunk. the truck seems to jerk when you push the gas, and then let, and then push it again. it feels like when you are going down hill and you have a load hammering on the truck. this happens when there is no load there. thus, it is worse when i do pull a load. what do you think now?
thabks,
57_F600
Keep 'Em Crankin'
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Posting Guru
Joined: Jun 1999
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From: Durham
302 chugs
[updated:LAST EDITED ON 13-Feb-02 AT 07:06 PM (EST)]Well, the u-joints could be the culprit...jack up the truck and check them out...you should see some play in them as you turn the drive shaft...and make sure you use jack stands!!!
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