Question about 1990 Jeep Wrangler

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Can not find the correct grommet for breather unit of my 1990 jeep wrangler/4cly fuel injected valve cover

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You can try the dealer they will have it in stock or will order it.i found 1 for my 89 6 cyl at advance auto parts in a small section where the vacume line connectors and window crank knobe are by the oil section.if u have the old 1 its easier to mach up, or u can use a piece of paper and trace the diameter of the whole and compare it to the new grommets center diameter.

Posted on Sep 02, 2010


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I have 89' jeep cherokee went to check air filter and found alot of oil in breather box thought i had bad pcv valve but autozone says doesnt have one 4.0 litre throtle body fuel injection

The solution is to remove the grommet on the valve cover (for the small line) and replace it with a grommet for a 1985 CJ7 along with the PCV valve for the CJ7. Prior to replacing the grommet, you must bend a metal tang inside the valve cover using a screwdriver. This tang is what forms the "spring" in the built in CCV valve. Bending it up, opens the valve all the way permanently.

Next, take a 3/8 inch quick connect air chuck (the kind you screw into a blow-gun or tire chuck for use on an air compressor equipped with quick connect fittings) and replace the screw in nipple on the manifold (where the original tube attaches) with the air chuck. The chuck is an exact fit (threading and length)but has a much larger internal diameter for the crankcase gases to flow. Finally run a section of 3/8 inch fuel line from the newly installed PCV valve to the new air chuck nipple you screwed into the intake manifold. Attach a hose clap at each end of the fuel line and you're done.

Feb 20, 2011 | 1989 Jeep Cherokee

1 Answer

I have an 88 Cherokee with a straight 6 and it leaks oil from my breather what can I do to fix it

Check your pcv valve and make sure the vacuum line that goes to it is not plugged up.
If that's clear and the valve is good then likely you have excessive blow-by ...that is caused by ring and cylinder wall wear. On an engine that old, it's normal but unfortunate. In that case, the only real fix is an engine rebuild but you may be able to minimize how much comes out of there by adding a good viscosity improver like lucas additive. A new breather grommet or seal may also help contain a bit of what's leaking as well.

Dec 14, 2010 | 1988 Jeep Wrangler

1 Answer

I have a 1990 jeep wrangler I put a new fuel pump in the gas tank and it is getting fuel to the outlet side of the fuel filter but I am not getting any fuel to the carb.I is fuel injected but it is not...

Not sure I remember this correctly, but with older cars that have carburetors, fuel is feed into carb via suction. Maybe you have a failing vakuum pump that's suppose to deliver the suction. If possibly have your error codes read via the OBD portal of your car, you can do this yourself if you have a OBD scanner or have a shop do it for you, shouldn't cost more than 100 bucks to have them scan the ECU or any error codes logged on the ECU. (Engine Control Unit)

Dec 06, 2017 | 1990 Jeep Wrangler

2 Answers

Use 4.0 valve cover on 90 4.2l engine omit pcv valve use breather

not a good idea, engines rely on negative pressure(vacuum) for seals on crank and camshaft seals
also for emission standards, sorry

Jun 30, 2010 | 1990 Jeep Wrangler

2 Answers


the motoor is having trouble breathing pcv may be clogged check all breathers clean as needed or its over filled

Jun 21, 2009 | 1990 Jeep Wrangler

1 Answer

Oil blowing out of the dipstick tube.

On top of the valve cover there is a fresh air breather unit. Make sure the breather unit is not plugged.
Also the fixed orifice PCV should be clear. Find a tool that will go through the orifice and make sure it is clean.
Remove the vacuum hose and check it for cracks or internal damage. With the engine running, make sure you have vacuum through the hose.
Let me know when your finished cleaning the crankcase breather system.

Apr 09, 2009 | 1994 Jeep Wrangler

1 Answer

No injector pulse, no current to the injector

Check the pickup in the distributor as this is the cam sensor. The injectors run of the pulses created while the rotor is turning around. It should be a plastic disk located under the rotor button.

Mar 13, 2009 | 1990 Jeep Wrangler

1 Answer

1991 Jeep Wrangler jerking and sputtering like it's out of gas

fuel filter would be the cheepest place to start

Dec 28, 2008 | 1990 Jeep Wrangler

1 Answer

2000 Jeep Wrangler TJ

The tube that comes out of the top of the valve cover is your pcv.
The grommet that it goes into gets blocked.

Oct 14, 2008 | 2000 Jeep Wrangler

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