Question about 1990 Ford F150

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Emission removed and can't find a vacume leak

I just purchased my 1990 ford 150 and the emission has been taked off and it sounds like there is a vacume line off and i can't tell where it would be.

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Look on top of the engine towards the rear to start. There are several fittings that have lines to them. You will have to eliminate it by process. Check one by one and you will eventually find the line that is leaking. There are lots to check.

Posted on Mar 07, 2009


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1 Answer

1988 ford f-150, 5.0 eng. truck is idling way too fast after it's warmed up. Why???

check emissions controls for leaks.. may have a vacuum leak in the hoses somewhere.

Feb 10, 2013 | 1988 Ford F 150

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I have an 2006 f150 5.4 liter..when I take off the truck sometimes jerks, and when I go to accellerate to pass, it seems to drag and the emission light comes on. What could this be?

maybe low fuel pressure or a vacume leak i had a 04 f150 4.6 i had a vacume leak on the back side of the motor it would surge at idle and was slugish but it was a bad leak

Sep 12, 2011 | 2005 Ford F-150

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1990 Ford F-150 has "rear

It is something in your brake system and it will take some troublshooting to figure it out. Although it says rear anti-lock it could also be the master cylinder.

But most likely, one of your rear caliper is started leaking and will required replacement. Also make sure that your emergency brakes are adjusted correctly and not dragging on one side or the other.

Jul 16, 2011 | 1990 Ford F150

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

2 Answers

I have a 1988 Ford F150 it idles at around 2500. It started this after I broke the pvc vacuum lines and fixed them with rubber hoses. Would this be a cause for the high idle??

sounds like u still have vacum leak to me take a can of carb cleanor an spray around your repares it will idle even higher when u find it good luck

Jan 13, 2011 | 1988 Ford F 150

2 Answers

1990 Probe will not idle, but revs up and down

not knowing what engine you the "check eng" light on?? it sounds like the AIR BY-PASS VALVE, you can remove it and try to clean it with choke spray, or repl. it...check for vac. leaks, and fuel delivery....hope this helps...GL

Jul 06, 2009 | 1990 Ford Probe

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Two issues - Vacuum leak or engine reversing rotation. Rwsolve is to ck ignition timing after correcting vacuum leak -good luck

May 19, 2009 | 1985 Ford F150

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Switch or blower motor

check your vacum hoses. you may have a vacum leak .

Feb 20, 2009 | 1990 Ford Probe

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Egine chugs intermitently

sounds like it might be a vacuum problem check all the vacuum hoses and spray some wd40 around the base of the carburetor while idling. if the engine revs up then you have a carburetor base gasket problem or a leaking vacuum hose

Jan 10, 2009 | 1982 Ford F 150

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