help 77 f150
11-01-2011, 09:34 PM
#1
help 77 f150
When I hold throttle at constant speed it like rattles like a diesel it sounds like abunch of Lincoln logs getting rubbed together... When u accelorate or let off nothing only when constant speed
11-02-2011, 02:27 AM
#2
I Voted For Bill and Opus
pre-detonation, Knocking can be caused by a number of things. The first thing you need to do is a complete tune up, a rebuild kit in the carburetor. etc. This should do it. An overly lean fuel/air mix can cause knocking, You have a first generation electronic ignition Check the cap, rotor, reluctor, pickup and control module. check the distributor shaft for wear. Check your sparkplug cables by running the engine at night and see if you have any arching. If the engine has a lot of miles on it the timing chain can be worn. If the engine idles smoothly after it warms up put a tach' on the engine and watch the idling speed. If the timing chain is worn you will often see the idle speed hunt around raising and falling a 100 rpm or so. Do the full tune up first as I said above this will probably take care of the problem If you don't have the expertise or the tools to do a full tuneup, and carb' rebuild take it to a good tune up shop It is going to cost you perhaps $300 dollars for the job but it is worth every penny to get back a smooth running truck.
Last edited by transmaster; 11-02-2011 at 02:33 AM.
11-02-2011, 09:35 AM
#4
Senior Member
As always, good info put up by Transmaster. Something else to consider, check your EGR for good flow. If its been disabled or removed, you might consider reinstalling. It did more to keep the cumbustion temps lower, as trans mentioned, then people think.
Its nice to see some of the older rigs are still out there. I have a 1973, 390 myself, poor thing just sits. Even with the 6 MPG, I doubt if it burns a tank of gas a year. Good luck.
Its nice to see some of the older rigs are still out there. I have a 1973, 390 myself, poor thing just sits. Even with the 6 MPG, I doubt if it burns a tank of gas a year. Good luck.
11-02-2011, 10:57 AM
#5
I Voted For Bill and Opus
G.O.B a truck 390 V8 they didn't make that many of them, The 390, and the 460 V8 are two of the best V8's Ford ever produced. You can really improve the gas mileage on a 390 with a better intake manifold, carb combination, and actually gain some HP while doing it.
Good Old Bill is right so many people disconnected the emission controls on these old trucks thinking they where going to improve things and they just made it worse. At that time nothing really ran well, you could mostly get away with it with large engines but small 4 and 6 cylinder engines ran like crap. At that time electronic engine controls where only found on European cars such as the SAAB 99, VW etc. It was the Bosch D Jettronic system to be exact. It was an analog system and an absolute dog State side because nobody was trained to work on them. For older vehicles such as 6th generation F150's a digital throttle body fuel injection system is the way to go. Essentially it was an electronically controlled carburetor. There are several performance part suppliers that make bolt on systems, the best of which is the one Edelbrock makes. (http://viewer.zmags.com/publication/...6e#/ddacbf6e/8) it isn't cheap but the improvements it makes in older vehicles over carburetors just has to be driven to be believed. The system is so easy to install.
Below is a little V8 engine **** for all of you showing a 390 V8 installed in an F100. Did you spot what is different about this particular truck?
Good Old Bill is right so many people disconnected the emission controls on these old trucks thinking they where going to improve things and they just made it worse. At that time nothing really ran well, you could mostly get away with it with large engines but small 4 and 6 cylinder engines ran like crap. At that time electronic engine controls where only found on European cars such as the SAAB 99, VW etc. It was the Bosch D Jettronic system to be exact. It was an analog system and an absolute dog State side because nobody was trained to work on them. For older vehicles such as 6th generation F150's a digital throttle body fuel injection system is the way to go. Essentially it was an electronically controlled carburetor. There are several performance part suppliers that make bolt on systems, the best of which is the one Edelbrock makes. (http://viewer.zmags.com/publication/...6e#/ddacbf6e/8) it isn't cheap but the improvements it makes in older vehicles over carburetors just has to be driven to be believed. The system is so easy to install.
Below is a little V8 engine **** for all of you showing a 390 V8 installed in an F100. Did you spot what is different about this particular truck?
