I have a 1982 mustang i rebuilt the engine and used a ho cam. my power brakes dont work i dont think i have enough vaccum. what do u think? is there any wayu 2 increase vaccum?
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Don't think it is the computer , wiring issue more then likely ! P0340 Camshaft Position Sensor Circuit Malfunction
P0340 - Camshaft Position Sensor 'A' Circuit Malfunction
Do you know anything about testing automotive electronics , an electrical circuits ?
Do you have an know how to use a digital volt ohm meter ? How to use a wiring diagram to pin point testing areas in a wiring harness . http://www.bbbind.com/free_tsb.html free wiring diagrams !
Cam timing, duration and lobe depth all play a role with vaccum. If the guy who rebuilt it
thinks the cam is bad then personally I would trust him and let him redo the cam. To make
a long and complex answer short. If the valves dont open at the right time for the correct
amount of time, bad things happen.
There are three kinds of 302s made from 1982-2001.
5.0L HO This engine was used in 1983-1995 Mustangs, Mark VII Lincolns, and some T-birds and Cougars. All Explorer 5.0L engines are 5.0L HO engines as well. They use the 351W firing order, 1-3-7-2-6-5-4-8. Except for the 1983-84 Mustangs, all of these engines are roller cam equipped. They use a reverse rotation water pump and front cover. The 1994-5 Mustang and all Explorers use a unique front cover and water pump.
5.0L Full Size Car This engine was used in 1982-1990 Crown Victoria and Grand Marquis. They use the 289-302 firing order, 1-5-4-2-6-3-7-8. Most of these cars are not roller cam equipped, however sometime in the early 1990s they started using roller cams but retained the 302 firing order. They use a standard (clockwise) rotation water pump and front cover.
5.0L Truck (except Explorer) These engines are similar to the Full Size Car engines, except they use different intake manifolds and camshaft profiles. They also use the 289-302 firing order, 1-5-4-2-6-3-7-8. They also began using roller cams sometime in the early 1990s. They use a reverse rotation water pump and front cover.
the cam belt should have a little slack in it,, about 1/2 inch over its longest run, its not like a fan belt witch should be tight, but check the idler bearing are not worn out,,and i do hope this is a new belt for this car,,,if your using the old belt,,,dont! fit a new one on it or it could brake on you, and that would be another engine rebuild on your hands,,,
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Your power streering works with a hydaulic pump driven by the engine belt, check the belt and pump.
Your power brakes works using engine vacuum, check for vaccum leaks from tubes that come form the engine intake plenum.
Sounds like it maybe a vaccum leak because when you apply the brake you brake booster uses vaccum to assist in braking so maybe theres not enough vaccum (air) going into the engine so its causing it to stall. Thats just a guess
Ran into this problem the same way you did, but back in '75 with a Ford 289.
First of all,and you've probably done it already, is to make CERTAIN all vacuum hoses and connections, tees etc. are leak free. Then move on to diaphram actuated valves (egr valve, heater core valve, vacuum modulator valve, distributor vacuum advance.... and then there's the diaphram actuated dampers for a/c and heat in the dash) ALSO, a good idea is to add a larger than stock vacuum canister, such as a large coffee can - metal of course!
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