I just had a new engine put into my 2003 jeep liberty. Sparatically the car engine light starts blinking the motor runs really rough and mis fires. I shut it off wait awahile turn it on and it works fine . I brought it back to the mechanic can't figure it out. Hsppens like every other day. HELP>

Asked by Jun 05, 2013 at 05:42 PM about the 2003 Jeep Liberty Sport 4WD

Question type: Maintenance & Repair

12 Answers

26,655

yeah its definately a misfire. If the place your taking it now cant figure it out try elsewhere. But whoever put the motor in should be able to figure out why it is misfiring.

228,305

Darn mechanics who don't know what they are doing!!!!! Have them check the electrical grounds, ignition system, coils and plugs. since the CEL is on, what are the codes?

26,655

@tom-perhaps the place they are taking it has cleaned the battery to chassis ground multiple times and is left wondering how this problem could posibly still exist.

228,305

Perhaps.....

330

I have the same problem with my 05 Lib and I was told to change the ASD relay (under the hood on the right, in the front), I did this and it stopped acting up for about 100 miles and then it started to misfire again, I pulled over and shut it off and restarted it and it ran fine again, so, my guess is that it has something to do with the ASD relay ($14.69 at Napa)

7,205

An extremly lean condition can cause missfires. trash in injectors,water in fuel,low fuel pressure, broke valve spring, upstream 02 sensor not reading right, Ive seen where carbon buildup in tip of injector has created issues. Where some vehicals have one hole in tip of injector, these have four. More prone to partially plug. Now the ASD relay powers up all injectors,fuel pump relay, alt. field, ign.coils and some other things. If this were going bad, vehical would want to shutdown. Like someone turned it off. Another thing you should never do, Is to put as much fuel in tank as poss.(force it in) When fuel pump clicks off, thats usually enough. If you overfill, raw fuel can get into charcoal canister. When this happens, the evap. system basically floods system. 02 sensors say.....fuel system is running too rich. They start cutting back fuel to try to reach their happy zone and this causes eng. to missfire due to lean condition. Hope this all helps.....

2 out of 2 people think this is helpful.
330

Thanks Jeep Doctor, actually my Jeep started acting up when I filled up my gas tank at an Irving station. What you said about the evap makes perfect sense, because it only misfires when I put any type of load on the system (accelerate or A/C) and the more fuel you put in the system with the vapor canister flooded would cause it to lean out. I will check the injectors also. how do you resolve a flooded vapor canister? replace it? Or will it clear up over time?

7,205

yes you replace it. What I would do before I condem it, is to unplug evap sys. from the engine and see how it runs. As far as how much fuel is in tank, this will make no diff. Once canister is flooded it will run rough. There is a hose that connects to intake behind throttle body on driver side. Disconnect hose by pulling it off, then plug off port on intake. Start eng. and see if missfire goes away.

7,205

the hose that you unplug goes to the duty purge solenoid. Just sayin this so you pull the right hose off.

7,205

could also be water in fuel. gotta use a release tool to take off fuel line. Then have someone hold a clean, clear plastic bottle to end of fuel line. Then just turn key to run position, wait a few seconds and do it again. Then allow fuel to sit for a short time. If you see bubbles in bottom of bottle, there is water in tank.

330

Thanks!

1 out of 1 people think this is helpful.
330

Update**** It turns out the Valve cover gasket seal was bad. Oil was leaking down onto the spark plug wires and grounding out the spark causing it to misfire. Appherently, this is a problem with both the four cylinder and the six cylinder engines.

1 out of 1 people think this is helpful.

Your Answer

Add photo

Related Questions

  • 2002 Jeep Liberty has problems starting back up 36 answers

    So, I've had my 2002 Jeep for a couple years now. Only in the past few weeks have I had this problem when I run errands. I can start my car up just fine and drive it around. The temperature gauge goes...

    2002 Jeep Liberty Sport 4WD

    -

    Maintenance & Repair

  • i have a 2004- 4 wheel drive- jeep liberty sport with a manual transmission, it will only go into gear if it is not running. 74 answers

    put it in gear with the motor off then with the clutch in tried to start it and it wanted to take off!! clutch feels good, clutch hydraulic has fluid in it...about 2 miles from home stopped at light t...

    2004 Jeep Liberty Sport 4WD

    -

    Maintenance & Repair

  • 2006 jeep liberty wont start 31 answers

    replaced starter, battery, tested alternator fine, replaced crankshaft sensor and it still wouldnt turn over then we replaced the camshaft sensor and it turns over and and wants to start but not star...

    2006 Jeep Liberty Renegade 4WD

    -

    Maintenance & Repair

  • Cylinder Misfire code 32 answers

    Hey I was wondering if anyone has ever experienced the engine light coming on and throwing a Cylinder misfire code. I noticed that my jeep would kinda feel like it was jerking through a gear, but real...

    2006 Jeep Liberty

    -

    Maintenance & Repair

Liberty

Looking for a Used Liberty in your area?

CarGurus has 7,242 nationwide Liberty listings starting at $999.

ZIP:

Search Jeep Liberty Questions

Jeep Liberty Experts

#1 fixmyjeep
fixmyjeep
Reputation 1,160
#2 Tom Demyan
Tom Demyan
Reputation 1,080
#3 rst429
rst429
Reputation 1,040
View All

Related Models For Sale

Used Jeep Grand Cherokee
805 Great Deals out of 70,393 listings starting at $995
Used Jeep Wrangler
291 Great Deals out of 19,181 listings starting at $3,295
Used Ford Escape
1,036 Great Deals out of 93,422 listings starting at $1,500
Used Toyota RAV4
598 Great Deals out of 66,773 listings starting at $999
Used Honda CR-V
692 Great Deals out of 57,481 listings starting at $1,600
Used Nissan Xterra
93 Great Deals out of 3,459 listings starting at $2,000
Used Toyota 4Runner
292 Great Deals out of 20,775 listings starting at $2,700
Used Ford Explorer
759 Great Deals out of 75,119 listings starting at $750

Used Cars For Sale

2012 Jeep Liberty Sport 4WD For Sale
24 Great Deals out of 631 listings starting at $6,995
2011 Jeep Liberty Sport 4WD For Sale
16 Great Deals out of 345 listings starting at $6,000
2010 Jeep Liberty Sport 4WD For Sale
8 Great Deals out of 352 listings starting at $6,250
2009 Jeep Liberty Sport 4WD For Sale
5 Great Deals out of 190 listings starting at $6,700
2008 Jeep Liberty Sport 4WD For Sale
18 Great Deals out of 528 listings starting at $3,900