Yj stalled

judoman6 · 08-16-2010, 06:37 AM

My son was running his YJ without the filter while it dried and he said the jeep felt like it ran out of gas. Could he have clogged the injectors? 1995 Wrangler 4 cyl.

WarWagon · 08-16-2010, 08:28 AM

Presumably you're referring to the air filter... I can't think of any other filter your son could get away without installing and/or have to worry about drying out.

First, crazy to run without an air filter... Second, $8 will get you a new purlator...

Assuming you're talking about the air filter, his rig injested unfiltered air which would do all sorts of nasty things to the engine. Does the engine turnover? Does it crank at all? Does it crank, start, then die?

Perhaps he's really out of gas - I have a 95YJ and my gauge does all sorts of silly things including appearing as though I have a good amount of gas when in reality I'm running on fumes - "quarter tank" and I actually ran out of gas on the side of the road

pasinbuy · 08-16-2010, 08:30 AM

What filter was he not running with?

Check his CPS when it goes it feels like you ran out of gas. The 95 Yjs and to be honest all Yjs have crappy fuel gauges. My gauge shows almost 1/4 tank when empty.

Check the engine codes.

Inform your son that filters save a motor and running without filters is the same as telling your vehicle that you only want it to last for another 100 miles.

judoman6 · 08-16-2010, 10:59 AM

Yes it was the air filter. he had just washed it and was letting it dry before oiling. I put in gas, it has a half of a tank. The engine turns over and seems to fire for a second but chugs and sounds like the gas was cut off.

WarWagon · 08-16-2010, 11:22 AM

Engine hydro-locked? Water/moisture snuck into the engine while running w/o an air filter?? Clearly your son doesn't have the run-of-the-mill airfilter one would get from Advance Auto

**idaholtby** · 08-16-2010, 12:00 PM

Was any other maintenance performed during this time frame other than the air filter? Running with out one temporarly is obviously ill advised, but it will cause long term issues, not immediate as you are experiencing. Any codes stored? If not, the check your fuel pressure at the rail and report back.

judoman6 · 08-16-2010, 12:26 PM

Nothing was done other than that, it kind of acts like it has water in the gas. I will check the fuel pressure tonight and see what's up with that.

**idaholtby** · 08-16-2010, 01:46 PM

Being that you have a TJ background, you may not be aware that the YJ can be checked for codes via the following while observing the Check Engine Light.... OBDI Error/Check Engine Codes - JeepForum.com Community Jeep Wiki

So besides checking the fuel pressure at the Schraeder valve (31psi norm at idle/ 38-41psi with vacuum line disconnected from the fuel pressure regulator), also check for codes that may be stored and report back. It is possible that a sensor will help point to the problem area.

allennh · 08-16-2010, 03:05 PM

If it runs fine for a little while and then dies, it's not hydrolocked. Unless nuts, bolts, rocks, bugs, or other debris gets into the intake with the filter off, it won't do anything bad in a short time -- but it's easy for some of those things (especially bugs) to find their way into the system.

Honestly, it just sounds like a fuel delivery issue. unrelated to running without the air filter. Check your gas and fuel pressure, make sure that nothing else came loose while the air filter was being removed. What motor does he have? 2.5? 4.2? 4.0?

judoman6 · 08-16-2010, 03:31 PM

2.5

pasinbuy · 08-16-2010, 04:57 PM

Just for the heck of it, pull the CPS and clean it. If it runs good then ok, if it runs just a little longer then quits, then you need a new CPS. A bad CPS should run for a bit after bring disconnected, then stop running.

**jsawduste** · 08-16-2010, 05:16 PM

Quote:

Originally Posted by pasinbuy

Just for the heck of it, pull the CPS and clean it. If it runs good then ok, if it runs just a little longer then quits, then you need a new CPS. A bad CPS should run for a bit after bring disconnected, then stop running.

Define a little bit.........

If the ECM does not see an ignition signal within 3 seconds of crank. It shuts off the fuel pump.

Gosh lots of guesses here. Lets start over. This is not rocket science.

Dad, ask the son.
1. How was it running before he removed and cleaned the filter ?
2. Could the filter be so over oiled that it is reducing the airflow ? I`ve seen it done before.
3. Did you try taking the newly oiled filter out and starting it ?
4. Sounds like it is running out of gas....Any smoke from the tail pipe ?
5. Like the response. Check for stored codes. The ECM is pretty smart. It should tell you if you have a bad sensor.
6. idaholtby has given you the best answer so far. Take his advice and see what the ECM says.

Roadyy · 08-16-2010, 05:26 PM

Gosh and your added GUESS came without reading that the oil covered filter you refer to is not even on the jeep when this supposedly happened...gosh
I do agree with you and idaholtby with checking the codes which on jeeps that have the system should always be one of the first thing on the checklist..

**jsawduste** · 08-16-2010, 06:20 PM

Quote:

Originally Posted by UABYJ94

Gosh and your added GUESS came without reading that the oil covered filter you refer to is not even on the jeep when this supposedly happened...gosh
I do agree with you and idaholtby with checking the codes which on jeeps that have the system should always be one of the first thing on the checklist..

Yes you are correct. I misread the OP. The son DID say the symptom started while he had the AC off.

I stand corrected !!

pasinbuy · 08-16-2010, 06:36 PM

Quote:

Originally Posted by jsawduste

Yes you are correct. I misread the OP. The son DID say the symptom started while he had the AC off.

I stand corrected !!

Where in this thread did anyone mention AC. Or for that matter having the AC off or on.

What does AC have to do with anything???