Australia Car

Australian Car Repair Issues? Ask an Auto Mechanic for Answers ASAP

Ask an Expert,
Get an Answer ASAP!

Australia Car

Jay I have a 2005 Nissan Navara v6 petrol VQ40 280000ks. I

Customer Question
Hi Jay I have a 2005...
Hi Jay
I have a 2005 Nissan Navara v6 petrol VQ40 280000ks. I had an issue with it running rough at idle and wouldn't accelerate. I kept pulling a Po300 code. I found the timing chain & guides well past there used by date to the point that the chains were loose. I replaced all chains, guides ect as per the workshop manual. Now I've got it all back together it still runs rough and keeps showing Po300 code. Runs better then before as the cams are in timing now but still no good. Your thoughts?
Submitted: 1 year ago.Category: Australia Car
Show More
Show Less
Ask Your Own Australia Car Question
Answered in 27 minutes by:
3/11/2016
AU Auto Mechanic: Matt, Engineer replied 1 year ago
Matt
Matt, Engineer
Category: Australia Car
Satisfied Customers: 22,477
Experience: Automotive Engineer for 20 years, BEng hons degree,
Verified

Hello

if you haven't already then replace the spark plugs if any of them fail this checklist:

http://www.ngksparkplugs.com/tech_support/spark_plugs/faqs/faqread.asp

You can also try spraying some water on the coil pack with the engine running. It is possible the coil is faulty and causing the misfire. If you see sparks arcing with the water, then replace the coil.

I'd check the condition of the injector plugs / connections as this could be a lean misfire if an injector isn't firing properly - the best way to check this is with a 'noid' light

http://www.noidlight.com/

Then check all the connections to the engine sensors one at a time, remove each one and examine for signs of corrosion or damage and a squirt of contact cleaner ( not WD40) will also help.

This could be an airleak after the airflow meter, any air dragged in here isn't 'seen' by the ECU and so not compensated for and leans the engine out causing rough running.

Check the hose clips for tightness and inspect the trunking for any cracks or splits and also all the vacuum system, the small bore pipes and fittings for cracks and missing parts.

The best way to locate a leak is to have the engine running and warm and then spray lighter gas /propane around each joint in turn. If the engine rev's up you've found your leak.

Now you might think that spraying lighter gas around a hot engine isn’t wise, however the flash /ignition point of gas is about 400°C so you need a naked flame or spark to set it off and I’ve used this method for many years without incident.

Work your way through each possible joint one at a time and you should find it. I use a slightly flattenedpiece of brake pipe and some rubber hose from the can of lighter gas to provide a spraying 'wand' and allow a direct blast of gas into each area, especially those difficult to reach with large implements.

Ask Your Own Australia Car Question
AU Auto Mechanic: Matt, Engineer replied 1 year ago

It’s also worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a poorly pump will all result in insufficient fuel being delivered to the engine

Ask Your Own Australia Car Question
Customer reply replied 1 year ago
Plugs have been changed with Autolite, does that matter ?
Customer reply replied 1 year ago
I've ran a smoke test for air leaks and no leaks were found
AU Auto Mechanic: Matt, Engineer replied 1 year ago

Hello

autolite aren't the best plugs but if they're quite young they should be fine

an as there's no air leak then the next step is to measure fuel pressure

Ask Your Own Australia Car Question
Customer reply replied 1 year ago
I felt that fuel pressure was fine so I skipped that test. After further inspection I found one of the catalytic converters blocked, all fixed and working fine now.
AU Auto Mechanic: Matt, Engineer replied 1 year ago

glad you got it sorted

however 1 thing to bear in mind is why did the cat block up in the 1st place?

as they should last 150K miles

so it may be worth checking that its not using oil and that the breather system is functioning correctly

Ask Your Own Australia Car Question
Customer reply replied 1 year ago
the timing was out due to worn timing chains and guides causing the engine to run rich. Also the plugs were well out of spec and have know to throw a misfire code. Fixed now
Customer reply replied 1 year ago
it has 280 thousands k's
AU Auto Mechanic: Matt, Engineer replied 1 year ago

ah well that would explain it

Bear in mind that the site takes a deposit from you at the beginning and this is held by the site until you rate my answer at which point the cash is split between the site and the expert. I am only paid for my work on this question if you rate my answer, using the star system at the top of the screen. Please do not forget! Thank you

Ask Your Own Australia Car Question
Ask Matt Your Own Question
Matt
Matt
Matt, Engineer
Category: Australia Car
Satisfied Customers: 22,477
22,477 Satisfied Customers
Experience: Automotive Engineer for 20 years, BEng hons degree,

Matt 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:

I would (and have) recommend your site to others I was quite satisfied with the quality of the information received, the professional with whom I interacted, and the quick response time. Thanks, and be sure that I'll be back whenever I need a question answered in a hurry.

Stephanie PElm City, NC

used your service this weekend with "Trecers" help. thank you ,thank you, thank you. replaced an A/C fan motor. Local Auto Zone had part. $15.00 "tracer" fee and $40.00 for parts, I saved several hundreds of dollers at a shop. i will recommend you and use you in the future.

David L.Richmond, TX

9 dollars, 2 hours of my time, and I drove away. Your diagnosis was right on the mark. Thank you so much.

PhilMarysville, CA

Lurch. Thank you very much. I had real doubts about this website but your promptness of response, quick followup and to the point answer with picture was incredible.

CharlesWalnut Creek, CA

As a single woman, I really appreciate an excellent and affordable opinion.
Thank you Geordie, I will not hesitate to contact justanswer in the future!

SueCharleston, WV

Another great insight to what may be the problem. I will have my mechanic take a look at it tomorrow. Thanks again, Frank...you do indeed know your stuff.

JimCastleberry, FL

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

< Previous | Next >

Meet the Experts:

Curtis

Curtis

Australia Car Mechanic

1,612 satisfied customers

Qualified Automotive Mechanic, LPG & Airconditioning Diagnostic Technician.

Glenn Bradley

Glenn Bradley

Australian Car Mechanic

699 satisfied customers

Ex Transmission Shop Owner, Driveline Specialist, 30+ years in the Australian Automotive Industry

Scott B

Scott B

Australia Car Mechanic

478 satisfied customers

Qualified Automotive Mechanic, Service Manager & Proprietor 20+ years

Technopro

Technopro

Australia Car Mechanic

149 satisfied customers

20 years of experience in Automotive Repair Techniques and Diagnosis Expert.

Matt

Matt

Engineer

22,477 satisfied customers

Automotive Engineer for 20 years, BEng hons degree,

Mark

Mark

Mechanic

618 satisfied customers

29 Years as a Vehicle Mechanic in Australian Military

Mechanic Martyn

Mechanic Martyn

Australia Car Mechanic

324 satisfied customers

Advanced trade certificate in Automotive engineering

< Previous | Next >

Related Australia Car Questions
Ford Falcon LPG my car is hard to start in early morning. Do
second opinion] Ford Falcon LPGHi there, my car is hard to start in early morning. Do u know what causes this problem? Thanks… read more
Gary
Gary
Senior Technician
Vocational, Technical or Trade School
61 satisfied customers
1998 vw golf gl power loss. Vw specialist mechanic is
vw specialist mechanic is investigating-could it be mass airflow sensor or filter? … read more
Matt
Matt
Engineer
22,477 satisfied customers
Folks I have a BA Fairmont Sedal 6cyl 4.0l which is in top
Folks I have a BA Fairmont Sedal 6cyl 4.0l which is in top condition. Have been told on last alignment of front tyres I need a "kit' to get the alignment right. Tyres scuff and wear. I would like to k… read more
Curtis
Curtis
Australia Car Mechanic
Vocational, Technical or Trade Scho
1,612 satisfied customers
I have a 2013 Hyundai i40 wagon, petrol motor. I live in
I have a 2013 Hyundai i40 wagon, petrol motor. I live in Fiji and in November last year, the A/C stopped working. They quoted $A4,400 to replace compressor! This seems outrageous to me, and most of the cost was in what they wanted to charge for the compressor - $A3,300. I have tried to find where I could source a compressor and have had a bit of trouble, as it seems this i40 may be a unique beast to Fiji! The agent tells me it is the only one in Fiji I have done my best to try and find a part number for the compressor, and the best I can come up with is that it is a Doowon DVE16 compressor. It has a number on the bottom of the ID plate that is: 1037E-05300###-##-#### Not sure if that is useful or not. The engine is of the G4NA series, and while I can find a compressor of this type with a place in Brisbane, it states that it is for a G4NC series. The VIN of my vehicle is: KMHLB81CMCU035784. Is there anything you can advise? I would like to purchase the A/C compressor either in Australia, or over the internet, but I need to be sure that it is the correct unit to fit. The vehicle is petrol...not diesel. … read more
Pete
Pete
Independent Auto Technician
Vocational, Technical or Trade Scho
138 satisfied customers
I want to remove the center armrest in order to have the
I want to remove the center armrest in order to have the leather replaced. Do I just remove about ten smal Phillips head screws on the underside of the top part, the part that lifts up? … read more
David Craig
David Craig
OWNER/MECHANIC
Associates
4,429 satisfied customers
2008 BF falcon, ignition switch came apart. Replaced
2008 BF falcon, ignition switch came apart. Replaced steering column with later type column with FG ignition switch, changed blown fuse in engine bay fuse box. Used original ignition switch, key reade… read more
Pete
Pete
Independent Auto Technician
Vocational, Technical or Trade Scho
138 satisfied customers
Tacho is reading very low. It does vary with revs but
Tacho is reading very low. It does vary with revs but obviously low indication on tacho dial. Speedo is ok … read more
Gary
Gary
Senior Technician
Vocational, Technical or Trade School
61 satisfied customers
2015 ix35 diesel auto. When decelerating at roundabouts
2015 ix35 diesel auto. When decelerating at roundabouts etc., at exactly 50kph & 40kph, the car shudders as it changes down. Had it 15 months, back to the dealer several times,they say its normal. Cor… read more
sprinkles08
sprinkles08
Technician
High School or GED
11 satisfied customers
I need roadside assistance, the battery seems to have gone.
I need roadside assistance, the battery seems to have gone … read more
Gary
Gary
Senior Technician
Vocational, Technical or Trade School
61 satisfied customers
75 series cruiser any paricular oil to use to make it work
75 series cruiser any paricular L.S.D oil to use to make it work as designed ? Thanks - rebuilding as hobbie ex - mine vechile that has obviously had money spent in the past … read more
Matt
Matt
Engineer
22,477 satisfied customers
I am a mechanic not much experience in BMWS My E53 X5 4.4
Hi i am a mechanic not much experience in BMWS My E53 X5 4.4 rear suspesion dropped yesterday Any steps ton follow My wife drove it a bit too fast over speed before then. It may have caused problem. A… read more
Pete
Pete
Independent Auto Technician
Vocational, Technical or Trade Scho
138 satisfied customers
I have a Ford Falcon FGX G6E Turbo. There is a rattle in the
I have a Ford Falcon FGX G6E Turbo. There is a rattle in the dash above the glove box. Can the panel covering the passenger air bag be removed or is it part of the airbag? Removing the panel should re… read more
Pete
Pete
Independent Auto Technician
Vocational, Technical or Trade Scho
138 satisfied customers
Gary?) EB falcon... xr6 s.... power steering stiff (not
Hi Guys,(Gary?)EB falcon... xr6 s.... power steering stiff (not working) in one direction (left) only... The car has a recently newish rack and pinion... ... pretty sure pump is working ok ( works fin… read more
Gary
Gary
Senior Technician
Vocational, Technical or Trade School
61 satisfied customers
The alarm goes off when I use the remote to unlock it No
Hi the alarm goes off when I use the remote to unlock it … read more
Pete
Pete
Independent Auto Technician
Vocational, Technical or Trade Scho
138 satisfied customers
Have just bought a 2000 AU V8 Tickford ute.The passenger
Hi Andrew have just bought a 2000 AU V8 Tickford ute.The passenger side window controller was working but only to open window.I did have both up and down control from driver's side,but this too has st… read more
Pete
Pete
Independent Auto Technician
Vocational, Technical or Trade Scho
138 satisfied customers
The turbo has been replaced as well as injector seals but it
the turbo has been replaced as well as injector seals but it still blows excessive white smoke … read more
Matt
Matt
Engineer
22,477 satisfied customers
Can I replace a passat 1.8 tsi 2010 with engine code cdaa
can I replace a passat 1.8 tsi 2010 with engine code cdaa with a 2011 2.0 tsi from a taigun … read more
Matt
Matt
Engineer
22,477 satisfied customers
Thanks your for helping me with my last querie and I would
Hi, Thanks your for helping me with my last querie and I would like to ask another question. I find that I have needed to top up my oil level between services since my car was new. Is this normal? Man… read more
Gary
Gary
Senior Technician
Vocational, Technical or Trade School
61 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