Question about 1987 Ford F 150

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I have a 1987 ford f-150 when i press the gas it looses vacum and does not regain untill i let off what could this be?

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Checl all vacuum lines, brake booste for leaks and the intake gasket
spraying carburetor cleaner around the intake is best to do
if the rpm's rise when doing so it has a leak

Posted on Mar 31, 2011

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1987 Ford F150 makes a hissing sound when applying the brakes. The braking seems to work. Someone said it means master cylinder is going out.


Hissing is more associated with a failing brake booster. Since it uses manifold vacum developed by the running engine, you will hear a hiss as the engine tries to restore the lost vacum.

Mar 20, 2011 | 1987 Ford F 150

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Feb 28, 2011 | 1991 Ford Aerostar Extended

1 Answer

I have a 87 ford f150 with a 351 an it will start if you pump the gas a lil but wont stay runing on its own i try to replace the vac lines but i wanting to know what is the main that i need to hook up i...


the only vacume lines you will really want to keep are the ones for the power brake booster, the vacume line to the distributer the vacume line or lines going into the firewall cause they may go to your heater controls and other then that you can take the rest off and plug any leaks there are then if she still wont stay running you need to do a major tune up with all the fixings.

Feb 14, 2011 | 1987 Ford F 150

1 Answer

Have vacume hoses loose on top of motor in a 1989 F-150 5.0L cant see where they go looken 4 a vacume hose diagram to fix the problum


I'd suggest you go to www.autozone.com and register there, (it's free). Once registered you'll have access to dozens of vehicle repair manuals many having diagrams.

NOTE: I'm not affiliated with autozone, but have registered there and find it useful.

Nov 16, 2010 | 1989 Ford F 150

2 Answers

Ford f-150 will crank but not start sounds like it wants to turn over. can hear full pump hum. new starter, new battery,. if i hit the gas pedel a lil while starting truck it will keep running but runs...


I had the same problem but I did two fixes for it (1) when I bought the truck several years ago the duel tank switch was pushed in but i never fixed it and just would switch tanks with the switch pushed into the dash. after awhile it acted like it didn't know what tank to draw from point is i finally replaced the switch and it ran, but still ran rough, (2) on the left side of the motor their is an EGR valve (it was green colored vacum hose) I replaced that vacum hose and now it runs great.

Aug 11, 2009 | 1992 Ford F150 SuperCab

1 Answer

I have a 1987 dodge ram pickup with a 318 engine


try a new accelerator pump in the carb,a reiuld may be the best bet.Check for vacum leaks first.

Jul 25, 2009 | 1987 Dodge Ram 50

1 Answer

My '88 Ford E-150 van (dual tanks) ran out of gas. Now it won't restart with either tank. How do I re-prime the system?


the easiest way is to take off the air filter top, and have someone turn the engine over while you SLOWLY (like out of the air hole in a gas can) pour gas into the carburetor (carefully...) have them press slightly on the gas pedal. It could take a couple minutes of pouring, but It will prime the gas lines. Stop when it will run on its own

Jun 06, 2009 | 1987 Ford Econoline

1 Answer

Ford f150 xLt 5.8


check the fuses you have some blown cheer pierre

Jun 24, 2008 | 1987 Ford F 150

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