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Author Topic: 2 dead cylinders, 2 and 4 need help  (Read 167 times)

Offline Kuma

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2 dead cylinders, 2 and 4 need help
« on: January 04, 2018, 10:04:11 AM »
back story, Gen 1, in a mini sand rail, had an issue with fueling, it would idle fine and rev up in neutral but under load it would stumble past 1/8 throttle, determined that fuel pump pick up was clogged, replaced the fuel system with 100 micron pre filter, 044 pump, 1:1 regulator and filter prior to fuel rail, ran great!
next day started it up and was running bad, determined by pulling coils that 2 and 4 were not running, swapped coils, swapped spark plugs, the problem did not move, pulled injector rail all injectors squirting. checked compression, not great, 150 +/-5 at all cylinders.

I'm thinking the next thing is swap injectors and see if the problem cylinders move? sort of at a loss here, is there something else common to cylinders 2 and 4 that could cause this?

Online Nosgsx1300

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Re: 2 dead cylinders, 2 and 4 need help
« Reply #1 on: January 04, 2018, 11:23:59 AM »
12v power to the coils or ground
Suzuki harness's stink
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Offline Kuma

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Re: 2 dead cylinders, 2 and 4 need help
« Reply #2 on: January 04, 2018, 01:20:14 PM »
Could you elaborate? the coils are getting spark, at least when you pull off the plug, why would it effect only 2 and 4 and not be more erratic?

Online Nosgsx1300

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Re: 2 dead cylinders, 2 and 4 need help
« Reply #3 on: January 04, 2018, 04:38:07 PM »
In the past I had horrible issues with voltage drop to the coils
I had spark, but it was WEAK

And as far as effecting only 2-4    the hackey way suzuki does their harnesses anything is worth looking into
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2011 Loring 204.88mph "naked"
2015 Loring 220.01743 MPH Faired in fifth gear

Online RansomT

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Re: 2 dead cylinders, 2 and 4 need help
« Reply #4 on: January 05, 2018, 12:12:55 PM »
Put a new set a plugs in it, they are cheap.  Start the engine and let it run for a couple of minutes.  Pull the plugs and see what they look like.  Could be the injectors because of the dirty pump/filter or the wiring harness.
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Offline Kuma

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Re: 2 dead cylinders, 2 and 4 need help
« Reply #5 on: January 06, 2018, 01:51:06 PM »
I swapped the injectors and the dead cylinders followed the injectors so I'll be buying a new set, non turbo motor, anyone used the injector sets found on ebay for less than $40?

Offline Kuma

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Re: 2 dead cylinders, 2 and 4 need help
« Reply #6 on: January 15, 2018, 09:22:16 AM »
here's the update on this, picked up a set of injectors from ebay, I have an event timer so I am able to accurately turn on the injector for a specific time and measure the flow, injector 1, 220cc/minute, injector 2 is 200cc/minute, the other 2 are flowing at 275cc/minute, I also checked the flow rate of the 2 good on the motor and they are also at 275cc/minute.
so right now I have 4 injectors in that flow 275cc/minute and it at least is hitting on all 4 , idles and revs good, I'll have to wait 'til superbowl weekend when I head back out to the desert to see how it actually runs. for those that don't know this is in a mini sand rail.
so if you are planning to buy "new" injectors from ebay, be sure to check them before installing.

PS, I checked an injector from one of the bad holes, it flowed 75cc/minute!