Jeep

Have Jeep questions? Ask a Jeep repair expert for answers

Ask an Expert,
Get an Answer ASAP!

03 JEEP LIBERTY W/3.7 MISFIRE 3 AND 6 CYLINDER AT 2500 RPM…

Customer Question
03 JEEP LIBERTY W/3.7 MISFIRE...
03 JEEP LIBERTY W/3.7 MISFIRE 3 AND 6 CYLINDER AT 2500 RPM
Submitted: 8 years ago.Category: Jeep
Show More
Show Less
Ask Your Own Jeep Question
Answered in 50 minutes by:
1/6/2010
Jeep Mechanic: Scott, Technician replied 8 years ago
Scott
Scott, Technician
Category: Jeep
Satisfied Customers: 1,190
Experience: Dodge,Chrysler,Jeep Master Tech since 92.ASE Master since 1990.Currently Dealer employed.
Verified

Hello, WElcome Ray- Does the engine misfire at idle or just 2500? in gear or park?

Is the misfire detected by the engine computer , or scanner- what scanner? Can it be felt- sorry for all the questions , Scott.

Ask Your Own Jeep Question
Customer reply replied 8 years ago

check engine light starts flashing scanner shows radom misfires mostly 3 and 6

modus scanner. miss can be felt but then fades at idle test drive does not show only came on when smog check did change plugs and switch coils no change

Jeep Mechanic: Scott, Technician replied 8 years ago

Ok, We see misfires like this cause by the valves not properly rotating and wearing only in one place- and as soon as the valve moves it stops sealing properly and causes the missfire , There is a service bulletin that relates to this concern - but for 05-06 model years.

Just 2 days ago I diagnosed this concern `on a 03- missfire on 3 , 4 , 5 .

The heads were pulled and liquid poured on the back of the valves leaked past some intake and exhaust valves.

A leak down test could be used . Chrysler has us test this by raising the rpm to 3500 -4000,

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. The repair procedure is to remove and replace the intake valves and replace the valve keepers..

 

Scott
Scott, Technician
Category: Jeep
Satisfied Customers: 1,190
Experience: Dodge,Chrysler,Jeep Master Tech since 92.ASE Master since 1990.Currently Dealer employed.
Verified
Scott and 87 other Jeep Specialists are ready to help you
Ask your own question now
Was this answer helpful?

How JustAnswer works

step-image
Describe your issueThe assistant will guide you
step-image
Chat 1:1 with a jeep mechanicLicensed Experts are available 24/7
step-image
100% satisfaction guaranteeGet all the answers you need
Ask Scott Your Own Question
Scott
Scott
Scott, Technician
Category: Jeep
Satisfied Customers: 1,190
1,190 Satisfied Customers
Experience: Dodge,Chrysler,Jeep Master Tech since 92.ASE Master since 1990.Currently Dealer employed.

Scott is online now

A new question is answered every 9 seconds

How JustAnswer works:

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

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

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.

StanSayre, 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!!!!

AlexLos 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.

GPHesperia, CA

I couldn't be more satisfied! This is the site I will always come to when I need a second opinion.

JustinKernersville, 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.

EstherWoodstock, NY

< Previous | Next >

Meet the Experts:

Chris

Chris

Shop Foreman

3,578 satisfied customers

Jeep Certified Master Tech

Mark

Mark

22 Year Factory trained technician

2,649 satisfied customers

Jeep factory training........25 years in the industry.

Dave

Dave

Jeep Master Tech

1,149 satisfied customers

Chrysler Triple Master, ASE master Tech AA degree in Auto.

moparfl

moparfl

ASE Certified Technician

1,130 satisfied customers

ASE Master Tech Chrysler Dodge Jeep Master Tech

Tim Mohr

Tim Mohr

ASE MASTER TECH

1,052 satisfied customers

30 YRS EXPERIENCE, FOREIGN AND DOMESTIC, GAS AND DEISEL

Ron Z.

Ron Z.

- Jeep Tech -

641 satisfied customers

18+yrs experience. State Inspector & Jeep Diagnostics/Repair

jeepmopar76

jeepmopar76

Jeep/Chrysler Triple Master Tech

579 satisfied customers

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

< Previous | Next >

Related Jeep Questions
My G-sons 2002 jeep engine failed and I bought a 2006 3.7
My G-sons 2002 jeep engine failed and I bought a 2006 3.7 liter to replace it..Will it work ? … read more
Dan
Dan
Automotive Technician
Vocational, Technical or Trade Scho
25 satisfied customers
My jeep will run as usual and then it will run at high rpms
My jeep will run as usual and then it will run at high rpms and not move. I can put it in park and then it will go again.. I did jjust have the check engine light tested and the MAP sendor is bad woul… read more
fordguy4u
fordguy4u
Automotive Tech
Vocational, Technical or Trade Scho
70 satisfied customers
2010 Jeep Liberty 3.7 Liter which is the cylinder number 1?
2010 Jeep Liberty 3.7 Liter which is the cylinder number 1? I check in my alldata program but don't show me nothing. please a more specific is going a be appreciate , thank you.… read more
Chris
Chris
Shop Foreman
3,578 satisfied customers
liberty sport: I have a 2002 jeep liberty with 3.7 eng. when
I have a 2002 jeep liberty with 3.7 eng. when I bought it there was a dead miss on #5. I replaced spark plug and the coil for that cyl and it runs great above idle. at idle there is a miss. my obd2 sa… read more
bill
bill
chrysler dodge jeep tech
Vocational, Technical or Trade Scho
458 satisfied customers
2007 jeep liberty 3.7 flashing engine light no codes car had
2007 jeep liberty 3.7 flashing engine light no codes car had no power clogged up cat then after install .road test engine light flashes and no codes no misfires any ideas… read more
gomi_otaku
gomi_otaku
Auto Technician (dealership)
Vocational, Technical or Trade Scho
2,229 satisfied customers
Jeep Liberty: My dauther brought her 2006 Jeep Liberty in because
My dauther brought her 2006 Jeep Liberty in because of miss firing, This is what the tech wrote down. Doe this make sence or is he being stupid. 71468 Scan test has stored faults for multi-cylinder Mi… read more
Eric
Eric
Retired
N/A
14,436 satisfied customers
Jeep Liberty: I have a 2004 Jeep Liberty with 3.7 engine. Will
I have a 2004 Jeep Liberty with 3.7 engine. Will a 2006 jeep Cherokee 3.7 work in the Liberty… read more
Mark
Mark
22 Year Factory trained technician
Vocational, Technical or Trade Scho
2,649 satisfied customers
liberty: 03 liberty 3.7 liter num 2and3 misfire came up on
03 liberty 3.7 liter num 2and3 misfire came up on scanner. changed those 2 coils ran good for couple days the the misfire came back. engine light back on. same 2 cylinders misfiring cleared the codes … read more
AMEDEE
AMEDEE
AUTOMOTIVE TECHNICIAN
Vocational, Technical or Trade Scho
9,105 satisfied customers
jeep liberty: 4x4..changed the converter plugs..crank..check engine
03 jeep liberty 3.7 4x4 the codes are p0300, p0302, p0304 i have changed the converter plugs, 02 sensors crank and cam sensors what else can i look at to get this car running better the check engine l… read more
Dan
Dan
Automotive Technician
Vocational, Technical or Trade Scho
25 satisfied customers
2007 jeep liberty: V6..coil pack..new fuel injectorchecked compression
I have a 2007 jeep liberty V6. I keep getting a P303 number 3 cylinder misfire. It runs the same with and without the light coming on. I changed the coil pack. I changed the spark plug twice. Put in a… read more
Daryl D.
Daryl D.
master certified technician
161 satisfied customers
2003 Jeep Liberty: Check engine light..cylinders..air filter..sensors
I have a 2003 Jeep Liberty w/3.7 engine. Check engine light comes on with P0300,P0302,P0305 engine cylinders misfiring. Replaced spark plugs, coils, PCV valve, installed new gas cap,new air filter new… read more
Chris
Chris
Shop Foreman
3,578 satisfied customers
2006 jeep liberty: miss..rpm..it showed misfire #6 cylinder
I have a 2006 jeep liberty. all at once the engine started to miss at 2100-2200 rpm. I checked the computer and it showed misfire #6 cylinder. I have repalced the plugs and coil and it still is missin… read more
ND-TECH
ND-TECH
Chrysler/Jeep/Dodge specialist tech
Vocational, Technical or Trade Scho
955 satisfied customers
Jeep liberty: what position should the air vent be
when i replace the thermoustat on my 03 jeep liberty 3.7 what position should the air vent be?… read more
Ron Z.
Ron Z.
- Jeep Tech -
Vocational, Technical or Trade Scho
641 satisfied customers
2002 jeep liberty sport: blown..3.7 v-6 with 67,000 miles..knock..miss
I have a 2002 jeep liberty sport motor was blown when purchased.I bought a replacement motor 3.7 v-6 with 67,000 miles from a junk yard motor has good get up and go but has a spark knock at idle and a… read more
Matt Hardy
Matt Hardy
Master Auto Repair Technician
Associate Degree
605 satisfied customers
5 and 6 misfiring..changed plugs, replaced ignition coils.
Having problems with cylinders3, 5 and 6 misfiring. changed plugs, replaced ignition coils. problem still exists, what next?… read more
Chris
Chris
Shop Foreman
3,578 satisfied customers
2002 jeep liberty sport: 2wd..gets warm..2500 and 3000 with acc pedal
have a 2002 jeep liberty sport 2wd 3.7 engine as soon as this engine gets warm it will not go over 3000 rpms cycles between 2500 and 3000 with acc pedal to floor… read more
brownjeff
brownjeff
Associate Degree
13,873 satisfied customers
2003 jeep liberty: coils and injectors same..intake..cam sensor
2003 jeep liberty 3.7 #3--#6 missfire new plugs swapped coils and injectors same... put new intake seals on new cam sensor… read more
Mark
Mark
22 Year Factory trained technician
Vocational, Technical or Trade Scho
2,649 satisfied customers
Liberty: check engine light..injector circuit..cylinder..runs fine
I have a 04 liberty with 54,000 miles and check engine light on coming up injector circuit open and #3 cylinder misfiring...any suggestions. Changed plud, and coil pack no help. Sometimes runs fine ot… read more
Kevin
Kevin
Owner Kevins Mobile repair
Vocational, Technical or Trade Scho
308 satisfied customers
Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Show MoreShow Less

Ask Your Question

x