Question about 1991 Ford Festiva

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Your PCV (Positive Crankcase Valve) has failed. The valve is designed to allow gas fumes in the crankcase to be recycled back through the intake and be burned off in combustion. There should be a black hose running into the airbox. It should also have a filter in the airbox. If you follow the hose to the engine itself it will end at the PCV. Replace the valve and the small filter in the airbox and this should resolve your problem as well as boost your fuel mileage.

Posted on May 31, 2010


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Posted on Jan 02, 2017


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1993 mits diamonte 3.0l v6 oil spews out from engine soking alternater andground cant figure out where from need ideas

Turn on your car check the vavel covers.also if you did your own oil change check out the oil filter the old rubber houseing from the old filter may be stuck on there and when the new oil filter was put on it was put over the old oil filter gasket.remove the oil filter and double check.

Jan 09, 2018 | Cars & Trucks

2 Answers

I have a ford transit van I keep losing loads of oil from the bottom of oil filter why.

there are a lot unanswered questions in your description here, but I will try to give you a few ideas.
when was the oil last changed? is it leaking from where the filter is attached, if so filter needs to be removed & either put back on or replaced. be sure before installing new filter to wet the filter gasket with a little new oil before installation, this helps with seal.

is there a hole in oil filter, if so it needs replacing.

is the filter on front or rear lower portion of engine? check to see where oil is coming from, it may be a front or rear crank shaft seal. which is a major project.

keep in mind that when the engine is running & also when vehicle is in motion the oil will be blowing back & occasionally make it look like the oil is leaking from somewhere else.

if you start by getting under vehicle ( make sure vehicle is properly blocked up so no chance of falling on you. do not trust the jack alone to hold up vehicle) and try to look & see where the oil is coming from.
there only certain places that oil can leak, gaskets, seals, line connections ect...

Jan 09, 2015 | Ford Cars & Trucks

1 Answer

I have a 1988 Jeep Grand Wagoneer that seems to be losing oil pressure then dying. I just changed the oil and the levels are fine. Not sure where to start... any ideas?

if this just started when you changed the oil and filter,then it might be the filter,it did it in my 89 jeep so i changed the filter to another brand and my oil pressure came back to i would recomend and stp or k&n or wix filter.if that doesnt then start looking at the oil pressure sensor and wire could also use a mechanical oil pressure guage and check it that way to.

Jun 01, 2011 | 1988 Jeep Grand Wagoneer

1 Answer

We changed the oil and oil filter, changed the air filter, changed the fuel filter, changed the spark plugs, and put injection cleaner in our 1994 Ford Explorer Limited and we are getting horrible fuel...

Clean the throttle plate-CRC Throttle Body Cleaner
Clean the MAF Sensor--CRC MAF Cleaner

Have the O2 Sensors tested

If it is 10 years old, the exhaust
converter may be plugged,that's
not good and shouldn't happen

Check for vacuum leaks
A leak causes the O2 Sensors to add fuel,
to account for extra air

Make sure the air filter box and ALL
Ducting to throttle is air tight

Dec 18, 2010 | Ford Explorer Cars & Trucks

1 Answer

After getting my oil changed at a local oil change place, my 2002 cavalier started ideling rough, revving up then slowing, stalling on the freeway and my check engine light came on. Any ideas?

Changing oil should not cause any running problems, providing that the oil was put back into the engine and did not leak out. I would check all vacuum lines to make sure that none became disconnected. Check all wiring as well though it's pretty difficult to accidentally disconnect anything. Harness connectors are usually difficult to unplug even when you do that on purpose.If you find nothing unusual, you can have a code scan done free at most larger parts stores. That should give you some idea which sensor may be giving you problems. On GM cars, make sure that the duct work between the air filter and throttle body on the engine is secure. The mass air flow sensor is mid-way between the filter and tb and needs proper air flow in order to operate.
Though the system appears complicated it really isn't but only careful testing can reveal problems. All your sensors work together and when one fails, the computer tries to compensate which causes symptoms that do not always match the problem. The one very necessary item in diagnostics is the use of a scanner and that's one thing I cannot do from here but I hope some of what I said is somewhat helpful to you in understanding what is going on under the hood.

May 25, 2010 | 1999 Chevrolet Cavalier

2 Answers

My 4.6 engine is getting 2 codes which tell me Lean mixture on en

What are the codes?
The codes you get,do not tell you what is wrong, or what to replace.
The fuel filter has no role here,unless completely clogged
You need to diagnose the cause,of the codes and symptoms your experiencing

You may have a valve cover,leaking oil onto a spark plug,or a bad coil,thus a misfire and O2 codes, as well as other codes, that will drive you crazy and in the end ,
just go away.

Make sure the ducting from Air Filter to the Throttle Body is in place and no vacuum leaks
You could clean the MAF Sensor --with CRC MAF Cleaner

Let me know what help you need, just too may things I could talk about

May 07, 2010 | 2002 Ford F150 Regular Cab

1 Answer

1997 nissan pickup 4 cylinder 1.8 ltr I believe. Oil is blowing back into the air filter. The small filter inside the air breather that catches the oil from the Rocker Cover gets filled with oil and...

has to have pcv or somebody took it out for some reason but if u are getting oil in the air filter like that most likly u hav a broke ring on one of your pistons

Oct 03, 2009 | 1997 Nissan Pickup

1 Answer

My truck is getting hot ,even after I changed the thermostat

Your thermostat could be bad, getting stuck. I had that happen. While driving down the road I noticed the guage went way over to the hot side then went back. I changed it and all is well. It will run hot if there is something blocking the air flow through your radiator. Good clean oil up to the fill line will help your engine run cooler. If you havent changed your oil and filter lately, the oil filter may be clogged (full) and the oil is bypassing it. This will leave gunk and metal parts in the oil that make the oil hotter than it should be. Make sure your coolant level is topped off and you have antifreeze in it. The proper mixture of antifreeze helps keep an engine cool. If there is too much grease and oil buildup on the outside of your engine it will run hotter because the air flow cannot reach the metal and cool it off. Is your radiator clogged. Some people, if they have a leak in the radiator will use stuff to seal it from the inside. These additives can clog the radiator. 
Are you sure you have the right thermostat ?

Mar 10, 2009 | 1998 Dodge Ram 2500 2WD

1 Answer

Horrible Gas Mileage

i would change the fuel filter and i would take a flashlight and to make sure none of my fuel injectors are leaking and i would also put the car on ramps and put something behind the rear wheels and check all of my gas lines under the car as while.

Feb 14, 2009 | 2000 Chevrolet S-10

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