Holden jackaroo 3.2 v6 auto

Submitted: Tuesday, Feb 22, 2011 at 02:18
ThreadID: 84527 Views:11399 Replies:4 FollowUps:9
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Has anyone had issues with bad mileage on a 3.2 v6 holden jackaroo, fuel consumption is terrible around 350 ks to a full tank . When i first got her she would do around about 450 ks or more . Sometimes theres a surge when you give her extra gas on the open road. Inspected fuel pump all was ok . Please help its driving me nuts. Or do you know a good mechanic as holden are twats i brought it to them and they gave me a nice bill without even fixing the problem.
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Reply By: Sand Man (SA) - Tuesday, Feb 22, 2011 at 07:10

Tuesday, Feb 22, 2011 at 07:10
I was once getting poor fuel consumption on my 3.6 V6 Jack but was also experiencing uneven idling and a strong smell of rich fuel mixture at times.

Turned out to be a leaking inlet manifold gasket.


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AnswerID: 446231

Reply By: SimonW - Tuesday, Feb 22, 2011 at 08:59

Tuesday, Feb 22, 2011 at 08:59
Hi David,
I had a 3.2lt Jack for 8 years & your milage unloaded should be much better, I suggest you replace the Oxygen sensor in the exhaust manifold this will cause the issues your are experiancing. Don't buy it from holden or you will need a 2nd morgage pick it up aftermarket for approx $70-80 quick to change & has a connetor to plug in.
cheers Simon.
AnswerID: 446245

Reply By: Hespy (NT) - Tuesday, Feb 22, 2011 at 10:10

Tuesday, Feb 22, 2011 at 10:10
Try cleaning the oxygen sensor first it worked with mine.
AnswerID: 446254

Reply By: Madfisher - Tuesday, Feb 22, 2011 at 13:35

Tuesday, Feb 22, 2011 at 13:35
Firstly most parts are available at repco for a lot less then Holden. Is it and auto or man?. The diff in fuel ecomony is roughly 100ks per tank. We have 3.5s in man and auto.
Things you can do to improve economy new plugs. new air filter, clean maf(I presume 3.2s have them) New oxeygen sensor, check egr valve is not blocked, clean throotle body . Put some injector cleaner through it and three tanks of premium fuel and lastly a very worthwhile mod on 3.2s is to remove the restrictors in the Y piece of the manifold. Now a lot of exhaust p-laces and mechanics will not believe they would put restrictors their, but trust me they are unless already removed. This mod alone is worth 1l/100. Downside a bit more of a throaty rumble when foot is to the floor but not unpleasant.
Also mufflers can also block up causing back pressure.
The good thing is your motor is one of the most durable motors out their if well serviced.
One other thing what oil are you running? I have switched to 10/30.
I get 400 ks towing my boat with 15l left in tank and up to 550 empty and that is out of a 3.5 with b/bar and ats.
That is the last thing b/bar and ats are worth 1/100 ea. buddies expect much more. Have you changed tyres.
Have it serviced and change all filters(fuel, oil air) first off.
Cheers Pete
AnswerID: 446268

Follow Up By: Madfisher - Tuesday, Feb 22, 2011 at 13:44

Tuesday, Feb 22, 2011 at 13:44
Sorry reread your post. The buddies at bottom should read muddies. We have just managed to get 500ks on a trip out of wifes auto Nullarbor.
Cheers Pete
FollowupID: 718610

Follow Up By: David H3 - Tuesday, Feb 22, 2011 at 23:55

Tuesday, Feb 22, 2011 at 23:55
I service the girl my self like oil changes oil filters etc . Once a year i take it to Holden for a major service . I have replaced the co2 censor and checked it out with Holden to make sure as it was a non genuine part. Its funny you mention the leaking manifold. When i accelerate hard there is like a popping noise which would probably be the gasket . thanks for your incite i will check it out and let you know. Cheers David
FollowupID: 718689

Follow Up By: Madfisher - Wednesday, Feb 23, 2011 at 13:19

Wednesday, Feb 23, 2011 at 13:19
Hi David, not sure where you are mate, but at the local Holden dealer the mechanics that where any good have either gone to the mines or set up for themserlves. I take it is showing no fault codes. Also if you do not mind a hard ride pump the tyres up to 40psi.
I think you will get better service by taking it to someone who specialises in tune ups. By the way how many ks has it done, and do you have 245/70 x 16s on the Jack.
Thing could be worse you could own a Paj and be up for thousands of dollars in repairs lol
Cheers Pete
FollowupID: 718717

Follow Up By: David H3 - Tuesday, Mar 01, 2011 at 02:12

Tuesday, Mar 01, 2011 at 02:12
Hi madfisher its been a while since have followed up on comments, been doing a bit of research and it seems to be a fuel management issue. I have a service Manuel and have cleaned the air control valve with an electrical cleaner, herd that carbon cleaner leaves oily residue on these sensors , also tested the mapping sensor. Manuel says to pull out plug to mapping sensor and measure voltage with multi meter on ref and ground reads 5 volts norm , then back probed
with 2 tiny hair pins on sensor ( middle pin ) and ground came back with 1 volt should read 5 volts . Book tells me its faulty got one coming in mail 75 dollars.
I will let you know how it all comes about. Cheers David Hagen
FollowupID: 719304

Follow Up By: Madfisher - Tuesday, Mar 01, 2011 at 12:48

Tuesday, Mar 01, 2011 at 12:48
Thanks for the follow up David.All in all they are a top vehicle.
Cheers Pete
FollowupID: 719330

Follow Up By: David H3 - Monday, Mar 07, 2011 at 18:03

Monday, Mar 07, 2011 at 18:03
Hi madfisher David here again. I have finally nailed it turns out it was the temp sensor (wiring connected with map sensor) Milage is now back to spec 500ks
country and 400 ks around city. Now i don't have to by a oil refinery lol
FollowupID: 719890

Follow Up By: Madfisher - Monday, Mar 07, 2011 at 20:51

Monday, Mar 07, 2011 at 20:51
Thanks for the follow up David, most people can not be bothered. Glad you found it. Have heard of this problem on Mitzs but not on a Jack. One to keep in mind though.
One reason I keep a running check on my economy. Have you checked out removing your restrictors from your y piece in the manifold. Apparantly the ones used on the 3,2 where quite restrictive. Apparantly worth 1/100.
I nearly brought another Jack a low mileage 3.2 for my youngest son, but he did not like the old style mag wheels, so let it slide.
Cheers Pete
FollowupID: 719936

Follow Up By: David H3 - Tuesday, Mar 08, 2011 at 01:07

Tuesday, Mar 08, 2011 at 01:07
Hi madfisher Does your 3.5 have a coolant sensor on the intake manifold?. Or is your fuel mixture controlled from a airflow meter near the air filter snorkel. Reason i ask is the haynes manuel witch is an American book mentions nothing about a coolant sensor on my model . I'm guessing your 3.5 would have a airflow meter.
As you mentioned about the y piece i will follow your advice as my whole exhaust system is ready for the grave.
i was 4wd at the beach today and saw a jackaroo towing a old hilux ute out of the sand and then up the sand dune exit. lol
Thankyou so much for your advice
FollowupID: 719952

Follow Up By: Madfisher - Tuesday, Mar 08, 2011 at 06:09

Tuesday, Mar 08, 2011 at 06:09
Yes Dave you guessed right.It has a MAF sensor near the filter. We brought a lovely Falcon (ED) years ago that I am sure the owner only sold due to poor ecomony. Turned out it was the thermostat not working and running to cold, hence rich. Very good source of info is the Jack forum at australia 4wd.
Cheers Pete
FollowupID: 719955

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