How JustAnswer Works:

  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.

Ask Mark Your Own Question

Mark
Mark, 22 Year Factory trained technician
Category: Jeep
Satisfied Customers: 11264
Experience:  Jeep factory training........25 years in the industry.
12104952
Type Your Jeep Question Here...
Mark is online now
A new question is answered every 9 seconds

2006 jeep liberty: 3.7l..I have a code p0305 and it misses

Resolved Question:

I have a 2006 jeep liberty with a 3.7l engine in it. I have a code p0305 and it misses sometimes but not all of the time. I replaced the #5 coil and all 6 spark plugs. I drove it a bout 200 miles and the light came back on with the the same p0305. I switched the coils around and nothing changed. I did clean the injectors but maybe injector problem?Need help
Submitted: 3 years ago.
Category: Jeep
Expert:  Mark replied 3 years ago.
Welcome to Just Answer Jeep my name is Mark.

Since you have eliminated the ignition system, your next step is to swap the injector with another cylinder and see if the misfire moves to the new cylinder.

Also, a compression test on that #5 cylinder would be a good thing to do righ tnow so that you know the cylinder is still mechanically sound.
Customer: replied 3 years ago.

Does jeep have problems with injectors?

Expert:  Mark replied 3 years ago.
Not normally, no, but we need to eliminate that possibility.
Customer: replied 3 years ago.
I just checked compression in #5 and #3 and it was 145 to 150psi swaping injectors now
Expert:  Mark replied 3 years ago.
Ok.
Customer: replied 3 years ago.
I just switch injectors around but I can't get it to miss right know. I have seen a TSB for valve keepers or something like that. Have you heard of any other isues?
Expert:  Mark replied 3 years ago.
Yes, I was just going through the TSB's.

SUBJECT:
Engine Misfire At Idle
OVERVIEW:
This bulletin involves installing revised intake valve locks and intake valves.
MODELS:
2005 - 2006 (KJ) Liberty/Cherokee (International Markets)
2005 - 2006 (ND) Dakota
NOTE: This bulletin applies to vehicles equipped with a 3.7L engine (sales code
EKG).
SYMPTOM/CONDITION:
The customer may experience occasional engine misfire at idle (rough idle). The
malfunction indicator lamp may illuminate for single or multiple cylinder misfire.
DIAGNOSIS:
1. Place vehicle in park or neutral.
2. Using a StarSCAN® or DRBIII®, monitor which cylinder is misfiring. Cylinder # XXXXX is the
most likely cylinder to have idle misfire, a cylinder on the opposite bank very very
rarely may exhibit a misfire at idle.
NOTE: When monitoring which cylinder is misfiring, counts should be above 10 per
minute.
3. Record misfire counts for 1 minute.
4. Rev engine up to 3500 to 4000 rpm and release, do not hold engine at elevated rpm
let it come back down to idle.
5. Monitor the cylinder misfire count for one minute. If the misfire rate does NOT reduce
to less than 5 per minute then repeat Step #4 and re-monitor up to ten times.
6. If the misfire rate DOES reduce to less than 5 per minute, perform the Repair
Procedure. If the misfire rate does NOT reduce to less than 5 per minute after
repeating Step #4 ten times this bulletin does not apply and further diagnosis is
required.
NUMBER: 09-007-06
GROUP: Engine
DATE: August 19, 2006
PARTS REQUIRED:
Qty. Part No. Description
12 53022277AA Lock, Valve
AR (6) 53020747AB Valve, Intake
AR (2) 53020989 Gasket, Head
AR (1) 53013932AB Gasket, Exhaust Manifold Right
AR (1) 53013933AB Gasket, Exhaust Manifold Left
REPAIR PROCEDURE:
1. Use the procedures outlined in TechCONNECT 9-Engine>Cylinder
Head>Intake/Exhaust Valve And Seats>Removal And Installation to replace ALL
intake valves and valve locks of the cylinder head that has the misfiring cylinder. Both
cylinder heads must have the locks replaced.
2. Repeat Step #1 through Step #5 of the Diagnosis monitoring all cylinders for misfire
after the repair work is completed.
3. A cylinder on the opposite bank very very rarely may exhibit a misfire at idle. If the
opposite bank now has a misfire, then the new keepers have allowed a non-rotating
valve with uneven wear to rotate and induce a misfire. In this case the intake valves on
this head must now be replaced.

Customer: replied 3 years ago.
how would I determine if this applies of I don"t have that kind of scan tool?
Expert:  Mark replied 3 years ago.
Without the proper tooling for this you can only do a process of elimination diagnosis. If you eliminate things one by one........ignition system, injector, fuel pressure, compression etc........and find no problem, then the only thing left would be the valves, as outlined in the bulletin.
Customer: replied 3 years ago.
Thank you for all your help
Expert:  Mark replied 3 years ago.
You're very welcome.
Mark, 22 Year Factory trained technician
Category: Jeep
Satisfied Customers: 11264
Experience: Jeep factory training........25 years in the industry.
Mark and other Jeep Specialists are ready to help you

JustAnswer in the News:

 
 
 
Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.
 
 
 

What Customers are Saying:

 
 
 
  • Thank you so much for your answer. My initial estimate was $325; I got it done for $100 - part and labor. Lynn B. Ormond Beach, FL
< Last | Next >
  • Thank you so much for your answer. My initial estimate was $325; I got it done for $100 - part and labor. Lynn B. Ormond Beach, FL
  • I was skeptical at first but thought I'd give it a try. I was pleasantly surprised. Your site actually is a quality service that I would recommend to others in a heartbeat. Stan Sayre, PA
  • Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help. Mary C. Freshfield, Liverpool, UK
  • This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!! Alex Los Angeles, CA
  • Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult. GP Hesperia, CA
  • I couldn't be more satisfied! This is the site I will always come to when I need a second opinion. Justin Kernersville, NC
  • Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around. Esther Woodstock, NY
 
 
 

Meet The Experts:

 
 
 
  • Mark

    22 Year Factory trained technician

    Satisfied Customers:

    2548
    Jeep factory training........25 years in the industry.
< Last | Next >
  • http://ww2.justanswer.com/uploads/MO/MoparCertified/2012-6-7_4142_mechanic.64x64.jpg Mark's Avatar

    Mark

    22 Year Factory trained technician

    Satisfied Customers:

    2548
    Jeep factory training........25 years in the industry.
  • http://ww2.justanswer.com/uploads/jeep10000/2008-9-18_222938_192601.jpg Chris's Avatar

    Chris

    Shop Foreman

    Satisfied Customers:

    2265
    Jeep and ASE Certified Master Tech
  • http://ww2.justanswer.com/uploads/ke4ich/2009-08-12_212931_DSC02211.JPG moparfl's Avatar

    moparfl

    ASE Certified Technician

    Satisfied Customers:

    1128
    ASE Master Tech Chrysler Dodge Jeep Master Tech
  • http://ww2.justanswer.com/uploads/nvltgo/2010-10-18_211525_youranswers.jpg Dave's Avatar

    Dave

    Jeep Master Tech

    Satisfied Customers:

    1120
    Chrysler Triple Master, ASE master Tech AA degree in Auto.
  • http://ww2.justanswer.com/uploads/tsmodie/2009-6-10_144056_tim.jpg Tim Mohr's Avatar

    Tim Mohr

    ASE MASTER TECH

    Satisfied Customers:

    805
    30 YRS EXPERIENCE, FOREIGN AND DOMESTIC, GAS AND DEISEL
  • http://ww2.justanswer.com/uploads/CD/CDJMastertech/2012-6-9_201455_JustAnswerProfilelarger.64x64.JPG CDJMasterTech's Avatar

    CDJMasterTech

    Jeep MasterTech

    Satisfied Customers:

    576
    Factory trained and certified Jeep Master Technician, ASE Master Technician
  • http://ww2.justanswer.com/uploads/jeepmopar76/2009-3-18_2204_63998760.jpg jeepmopar76's Avatar

    jeepmopar76

    Jeep/Chrysler Triple Master Tech

    Satisfied Customers:

    572
    32yr ASE Master Tech, 9yr Chrysler Master Tech, 19 yr Jeep Dealership service including AMC/Eagle