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Force backfire works but then comes back

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zookz

az supporter

Joined: Wed Mar 30, 2011 2:38 am
Posts: 80
Location: South West
Vehicle: Vitara G16b , Sierra G16b

Posted: Tue Mar 05, 2013 1:51 pm

Gday all, I have a mate with a 87 Sierra that has been extremely temperamental and bloody frustrating. When it plays up it runs rough, kangaroo hops, bogs down, no power, backfires etc etc
But when I do a mexican tune up (2-3) it runs perfect! Until it comes back to the same problem after another small drive.
Have checked fuel pressure (4-5psi)
Changed Coil
Leads
Checked Plugs
Adjusted mixture and idle
Adjusted timing

What can this be? The air filter looks new...?

I also swapped carbys! But could the second carby be faulty 2?

Maybe need a full carby kit?

Cheers

JrZook

Joined: Tue Aug 08, 2006 11:30 pm
Posts: 5517
Location: Holland Park
Vehicle: Awesome!!

Posted: Tue Mar 05, 2013 4:10 pm

zookz wrote:

Maybe need a full carby kit

Sounds like it

Mike57

az supporter

Joined: Fri Jul 22, 2011 11:09 am
Posts: 1009
Location: Melbourne
Vehicle: Suzuki Jimny 2009

Posted: Tue Mar 05, 2013 6:03 pm

The backfiring indicates a timing issue or a sticking valve. I am not an expert but does a Siera have a timing belt or chain. Is the belt slipping. Could there be a sticking valve which could happen if a stem was bent or there was some overheating at some stage.

droverdave

Joined: Wed Dec 19, 2012 7:43 am
Posts: 685
Vehicle: 85 ' Drover

Posted: Wed Mar 06, 2013 7:51 am

what is a mexican tune up.

Bruce

az supporter

Joined: Sun Jun 11, 2006 11:30 pm
Posts: 4003
Location: Brisbane

Posted: Wed Mar 06, 2013 8:08 am

Swapping leads around. EG: putting number 4 lead onto number 1 on the dizzy. Good backyard stuff for fixing a blocked carby in the bush.

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atari4x4

az supporter

Joined: Mon Dec 11, 2006 10:30 pm
Posts: 34842
Location: East Radelayed
Vehicle: SV420+SV620 Vitara's

Posted: Wed Mar 06, 2013 8:57 am

very similar to the french tune up, where you rev it up & smother the carby to try & suck the crap through the jets.

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alien

Joined: Wed Mar 24, 2010 10:30 pm
Posts: 16343
Location: Perth
Vehicle: '92 Sierra, 1.6efi, SPOA, 31s.

Posted: Wed Mar 06, 2013 9:11 am

maybe check the auto-choke isnt going... mine did all sorts of weird shit when that happened... i replaced the auto choke twice before dtiching it for a weber with manual choke so it wouldnt happen again, cos its a pain in the ass.

zookz

az supporter

Joined: Wed Mar 30, 2011 2:38 am
Posts: 80
Location: South West
Vehicle: Vitara G16b , Sierra G16b

Posted: Wed Mar 06, 2013 10:44 am

The auto choke has been disconnected by me so it's not that...
Maybe contaminated fuel?
It's just really weird because when I backfire it, it runs so sweet.

Matthew

Joined: Mon Jun 15, 2009 11:30 pm
Posts: 472
Location: S.E. Melbourne
Vehicle: SWB Sierra

Posted: Wed Mar 06, 2013 10:50 am

Have you got a fuel filter between the fuel pump and carby?

atari4x4

az supporter

Joined: Mon Dec 11, 2006 10:30 pm
Posts: 34842
Location: East Radelayed
Vehicle: SV420+SV620 Vitara's

Posted: Wed Mar 06, 2013 10:50 am

could be dirty fuel tank/lines, heaps of people run a 2nd fuel filter just before the carby

EDIT: beaten

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Built4thrashing

Joined: Wed May 21, 2008 11:30 pm
Posts: 4972
Location: Dandenong .Vic
Vehicle: 1999 GV. Locked and Lifted

Posted: Wed Mar 06, 2013 3:28 pm

Check the fuel pump is not stuffed and sucking oil into the fuel.

Blocked PCV Valve.

Crap leads or rotor button

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