lost power while driving at 55mph

Reply Subscribe

Thread Tools

Search this Thread

Jan 5, 2003 | 08:57 PM

jtlinn

Thread Starter

New User

Joined: Dec 2002

Posts: 9

Likes: 0

From: Park River

lost power while driving at 55mph

i recently purchased a 77 f-250 crewcab i've been driving it for about 2 weeks maybe put 200 miles on it . while driving it home i was cruzin at about 55-60 mph and motor lost power. pickup still ran but i had to keep it to the floor to get 50 mph out of it. i had already replaced the inline filter checked the one on the carb when i got home both seemed to be fine. checked the plugs doesn't seem to be running lean looked ok. i let the truck cool down started it back up and ran fine until it warmed up, this baffles me a little because the truck had run for an hour before this occured the first time. i pulled the wires off one at a time to see if it was missing. 1-3-5 didn't seem to make a differance at idle. my question is would a miss on three cylinders happen all the sudden like this or could it be something else any thoughts would be appreciated

Jan 5, 2003 | 09:47 PM

Torque1st

Posting Legend

Joined: Sep 2001

Posts: 30,255

Likes: 37

lost power while driving at 55mph

Hello- Welcome to FTE!

Check your ignition module. Take it to a parts store for testing. The modules are often heat/temperature sensitive.

Thanks for using FTE!

[link:www.ford-trucks.com/cgi-bin/dcforum/dcboard.cgi?az=list&forum=DCForumID75&conf=genconf |Garage and Shop] Forum
[link:www.ford-trucks.com/cgi-bin/dcforum/dcboard.cgi?az=list&forum=DCForumID116&conf=DCConf ID9|Ranger] Forum
[link:www.ford-trucks.com/cgi-bin/dcforum/dcboard.cgi?az=list&forum=DCForumID91&conf=DCConfI D12|1973-1979 Ford trucks] Forum
[link:www.ford-trucks.com/cgi-bin/dcforum/dcboard.cgi?az=list&forum=DCForumID93&conf=DCConfI D8|1997-2003 F150 and E150 Forum]
[font color=red]As a Moderator I do not "Subscribe" to most topics,
please send email/pm if you need a reply -Thanks![/font]
-

Jan 7, 2003 | 02:37 PM

Blaine

Senior User

Joined: Nov 2001

Posts: 121

Likes: 0

lost power while driving at 55mph

I have seen that also happen with fuel filters. The truck sits, the junk falls to the bottom of the filter and away you go for awhile.

But definitely check the magic box also.

Jan 7, 2003 | 04:35 PM

Quadiquizm

Elder User

Joined: Jun 2001

Posts: 913

Likes: 0

From: Canada

lost power while driving at 55mph

I concur - sounds the module.

Keep it Rubber Side Down!

Jan 7, 2003 | 11:40 PM

jtlinn

Thread Starter

New User

Joined: Dec 2002

Posts: 9

Likes: 0

From: Park River

lost power while driving at 55mph

thanks for the advise. i'll check it out this weekend i'll be gone for the rest of the week. let you guys know how it works out this weekend

thanks

Jan 8, 2003 | 08:29 PM

lshort

Laughing Gas

Joined: Mar 2002

Posts: 942

Likes: 338

From: Newton Illinois

lost power while driving at 55mph

I had a problem like this once, the truck ran fine for a few minutes then down to 20 MPH. Let it set and it would be OK for a few more miles.It ended up being debris in the float bowl as the truck ran it sucked the junk over the main jets.Let it set and the junk would float away for a while.I dont know much about carbs but could one
main jet cloged cause 1,3&5 to miss?

Larry

Jan 9, 2003 | 01:59 AM

yogibear619fla

New User

Joined: Jan 2003

Posts: 9

Likes: 0

From: holly hill usa

lost power while driving at 55mph

an often overlooked, but common problem in the duraspark ignition system is the rotor button.i have had these things act from fuel starvation to 'limp mode" symptoms,to even changing the coil,for fear of heat related breakdown.try it, you may surprise yourself.

Top 10 Ford Truck Tragedies

Joe Kucinski

AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make

Brett Foote

Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!

Michael S. Palmer

Ford's 2001 Explorer Sportsman Concept Looks For a New Home

Verdad Gallardo

10 Best Ford Truck Engines We Miss the Most!

Joe Kucinski

2026 Shelby F-150 Off-Road: Better Than a Raptor R?

Brett Foote

2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!

Michael S. Palmer

10 Most Surprising 2026 Ford Truck Features!

Joe Kucinski

Top 10 Ford Trucks Coming to Mecum Indy 2026

Brett Foote

5 Best / 5 Worst Ford Truck Wheels of All Time

Joe Kucinski

Jan 12, 2003 | 11:40 AM

g6unltd

New User

Joined: Dec 2002

Posts: 5

Likes: 0

From: USA

lost power while driving at 55mph

My 76 did the same ran good till it warmed up then started missing & running rough then finaly dieing. Everyone told me it was the ign. mod. as everything else checked out OK. I spent a few bucks figureing out it was the distributer. A friend told me how to test it but I've forgoten how.
BadBootBob