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G16b runs shit

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Colin

Joined: Sun Jul 30, 2017 3:13 pm
Posts: 16
Vehicle: 1.3 Sierra

Posted: Wed Aug 16, 2017 11:39 am

Hey everyone.
I have an 89wt sierra with a g16b (from x90)
It only seems to run on 3cyl.
Has spark to all 4. Has fuel to fuel rail. Timing is right.
I pull no.3 spark lead off and it doesn't change idle.

Just wondering where the logical place to look would be?

Cheers.

fordem

Joined: Mon Apr 19, 2010 11:30 pm
Posts: 2655
Location: Georgetown, Guyana
Vehicle: JB420, APK416, A6G415, A6N415

Posted: Wed Aug 16, 2017 12:24 pm

Have you tried changing the plug?
Is the injector firing?

bumstein

az supporter

Joined: Sat Oct 06, 2012 5:49 pm
Posts: 1975
Vehicle: Sierras!! SWB and LWB

Posted: Wed Aug 16, 2017 3:11 pm

Vacuum leaks are worth exploring for. I'm not familiar with the G16B but a vacuum leak can cause a single cylinder to misfire

Colin

Joined: Sun Jul 30, 2017 3:13 pm
Posts: 16
Vehicle: 1.3 Sierra

Posted: Wed Aug 16, 2017 5:18 pm

Have swapped plugs around with no changing results
Not sure how to tell without pulling injectors out?
Will have a close look/test the vacuum hoses.

Thanks

MrRocky

Joined: Thu Dec 17, 2009 10:30 pm
Posts: 4731
Location: perth

Posted: Wed Aug 16, 2017 6:39 pm

Fuel filter, dirty tank
What fuel pump setup are you running ?

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tanshi

az supporter

Joined: Tue Jan 09, 2007 10:30 pm
Posts: 7719
Location: Brisbane

Posted: Thu Aug 17, 2017 10:38 am

you should be able to check the injector pulse signal on the injector plug with a test light to see if all are pulsing

Colin

Joined: Sun Jul 30, 2017 3:13 pm
Posts: 16
Vehicle: 1.3 Sierra

Posted: Fri Aug 18, 2017 2:41 pm

Hesitates and backfires. Still no number three.
Vac hoses look ok.
In tank pump (coily maybe). New fuel and filter.
All injectors are pulsing. Could there still be blockage?
I think compression test next?

MrRocky

Joined: Thu Dec 17, 2009 10:30 pm
Posts: 4731
Location: perth

Posted: Fri Aug 18, 2017 2:59 pm

Does it run a crank angle sensor in the front of the sump ?

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fordem

Joined: Mon Apr 19, 2010 11:30 pm
Posts: 2655
Location: Georgetown, Guyana
Vehicle: JB420, APK416, A6G415, A6N415

Posted: Sat Aug 19, 2017 12:16 am

Colin wrote:

All injectors are pulsing. Could there still be blockage?

Yes.

MrRocky

Joined: Thu Dec 17, 2009 10:30 pm
Posts: 4731
Location: perth

Posted: Sat Aug 19, 2017 8:21 am

Backfiring normally means timing related not fuel, if the motor runs a crank sensor then this could be the issue, coilpacks normally break down and hesitate but no backfiring

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tanshi

az supporter

Joined: Tue Jan 09, 2007 10:30 pm
Posts: 7719
Location: Brisbane

Posted: Mon Aug 21, 2017 11:23 am

depends if there is fuel getting to the exhaust unburned and then igniting

Colin

Joined: Sun Jul 30, 2017 3:13 pm
Posts: 16
Vehicle: 1.3 Sierra

Posted: Mon Aug 21, 2017 4:01 pm

MrRocky wrote:

Backfiring normally means timing related not fuel, if the motor runs a crank sensor then this could be the issue, coilpacks normally break down and hesitate but no backfiring

Not sure a crank angle sensor would isolate the problem to no.3 cyl?
Compression test is all good!
Guess I'll be pulling the injectors out. Is there any way to test on the bench? Or should i be taking them to a mechanic?

Cheers

tanshi

az supporter

Joined: Tue Jan 09, 2007 10:30 pm
Posts: 7719
Location: Brisbane

Posted: Mon Aug 21, 2017 4:14 pm

something like this maybe

https://www.youtube.com/watch?v=xvkRZWBG6vs

alien

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

Posted: Tue Aug 22, 2017 7:44 am

Mine backfired and 'missed' like mad when the stems had died (leads, whatever) - At first it was just one of them, then suddenly it was un drive-able when the coil pack went and took out two cylinders.

While it's running, unplug each stem and see if there's one that makes no difference.. that'll help isolate it if it's them.

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tanshi

az supporter

Joined: Tue Jan 09, 2007 10:30 pm
Posts: 7719
Location: Brisbane

Posted: Tue Aug 22, 2017 8:08 am

alien wrote:

already did this

Dalahare

Joined: Tue Mar 28, 2017 6:06 am
Posts: 10
Vehicle: 1997 2.0 JLX 3dr

Posted: Tue Aug 22, 2017 11:06 am

Move injector to another cylinder and see if the problem moves across.

Colin

Joined: Sun Jul 30, 2017 3:13 pm
Posts: 16
Vehicle: 1.3 Sierra

Posted: Thu Aug 24, 2017 3:42 pm

Well i pulled it all apart and then put it all back together and she's running on all 4!
New problem! Starts fine, idles high (2500rpm).
Once warm, it surges quite fast between 1500 and 1800rpm.
What problems have others experienced resulting in these symptoms?

Cheers

Gwagensteve

Joined: Thu Feb 26, 2009 10:30 pm
Posts: 12997
Location: Melbourne

Posted: Thu Aug 24, 2017 3:46 pm

air in coolant lines to the throttle body.
Clean IAC valve

MrRocky

Joined: Thu Dec 17, 2009 10:30 pm
Posts: 4731
Location: perth

Posted: Thu Aug 24, 2017 4:16 pm

Id try find a complete throttle body to swap and iac

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tanshi

az supporter

Joined: Tue Jan 09, 2007 10:30 pm
Posts: 7719
Location: Brisbane

Posted: Thu Aug 24, 2017 4:32 pm

its been sitting for a while so im betting on a sticky IAC

MrRocky

Joined: Thu Dec 17, 2009 10:30 pm
Posts: 4731
Location: perth

Posted: Thu Aug 24, 2017 5:01 pm

I never have much luck just cleaning the iac always seem to end up swapping the whole assembly over as a fix

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Colin

Joined: Sun Jul 30, 2017 3:13 pm
Posts: 16
Vehicle: 1.3 Sierra

Posted: Thu Aug 24, 2017 5:03 pm

Yay bit of wax and grease remover and paint brush iac and throttle valve and she purrs like a kitten!

Colin

Joined: Sun Jul 30, 2017 3:13 pm
Posts: 16
Vehicle: 1.3 Sierra

Posted: Thu Aug 24, 2017 5:04 pm

Thanks all.

tanshi

az supporter

Joined: Tue Jan 09, 2007 10:30 pm
Posts: 7719
Location: Brisbane

Posted: Fri Aug 25, 2017 8:07 am

Result!

RhysE

Joined: Wed Nov 23, 2011 3:58 am
Posts: 26
Location: bateau bay

Posted: Fri Aug 25, 2017 5:18 pm

How exactly is the IAC cleaned ? And how do I remove it. On a baleno g16b ? Cheers

Colin

Joined: Sun Jul 30, 2017 3:13 pm
Posts: 16
Vehicle: 1.3 Sierra

Posted: Fri Aug 25, 2017 9:50 pm

Will take a pic tomorrow.

RhysE

Joined: Wed Nov 23, 2011 3:58 am
Posts: 26
Location: bateau bay

Posted: Fri Aug 25, 2017 10:02 pm

Legend Thanks mate

Colin

Joined: Sun Jul 30, 2017 3:13 pm
Posts: 16
Vehicle: 1.3 Sierra

Posted: Mon Aug 28, 2017 5:08 pm

RhysE wrote:

How exactly is the IAC cleaned ? And how do I remove it. On a baleno g16b ? Cheers

Pull this off and use carby cleaner and toothbrush and clean throttle valve. There is also a little bypass valve that controls idle, clean this too!

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RhysE

Joined: Wed Nov 23, 2011 3:58 am
Posts: 26
Location: bateau bay

Posted: Mon Aug 28, 2017 5:47 pm

Awesome thankyou my baleno motor looks abit different but I should be able to find that part aswell anyways

Cable_Tyy

newbie

Joined: Thu Nov 19, 2020 1:52 pm
Posts: 4
Vehicle: 1989 1.6 Suzuki Sierra

Posted: Sun Sep 05, 2021 7:07 pm

Colin wrote:

RhysE wrote:

How exactly is the IAC cleaned ? And how do I remove it. On a baleno g16b ? Cheers

Pull this off and use carby cleaner and toothbrush and clean throttle valve. There is also a little bypass valve that controls idle, clean this too!

That’s just the TPS isn’t it?
IAC is under it with coolant lines attached?

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