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Offline CCALF

Zforce 800 Cranks but no start
« on: October 07, 2018, 12:31:01 pm »
Hi guys,

I am having issues with my machine. The other day I tore apart the sock airfilter box and added a snorkel for the air filter. I sprayed the filter with oil and placed it back on. I turned the machine on and it ran fine for a short time then shut off...  i think oil got sucked into the engine and it shut off. NOW I CANNOT START IT.

I changed both spark plugs and the plug closest to the front is wet with gas/oil. Ive tried to wait 24 hours and restart but with no luck.

I am receiving codes P0122 and P0351-P0352. Ive tested the ingintion coil and the TPS sensor per the service manual and they both test fine. I also have a good blue spark off both spark plugs....

Fuel pumps runs and turns off Like normal. I also tried to start with starter fluid but no luck.

Any advice would would help!
« Last Edit: October 11, 2018, 07:30:09 pm by NMKawierider »

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Online NMKawierider

Re: Zforce 800 Crack but no start
« Reply #1 on: October 07, 2018, 01:11:03 pm »
All can be from low ignition circut/ECM voltage...and while cranking the voltage will be at it's lowest. Charge the battery for several hours and while doing so, check the cable connections then check the main fuse and especially it's holder. If yours is am older model, it will have a glass fuse close to the battery where the newer ones will be a conventional under the seat..test the voltage before and after the fuse while cranking...many have failed internally.. and that high resistance causes low voltage from there down stream to the systems. Test the voltage at one coil while cranking. If below 12 volts, there is a problem. Many Coils won't charge when it falls below 11.5.
« Last Edit: October 07, 2018, 01:14:35 pm by NMKawierider »
2015 Z Force 800 (53") EPS -
Custom Air Intakes | Custom Exhaust Mod | SuperATV Harness | Custom Fenders | Custom Skid/Rock Sliders | 27" GBC Grim Reapers | Seizmik Mirrors |Конструктор (Rodin's) Doors | Dr Pulley Sliders | 1.5" Wheel Spacers | BENZ Silencer (as needed) | SATV Flip Windshield W\ Rear Shield | Dual Light Bars | Diamond Plate Storage | Magellan TRX7 GPS| Bandit Springs

My Videos On YouTube

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Offline CCALF

Re: Zforce 800 Crack but no start
« Reply #2 on: October 07, 2018, 01:25:13 pm »
Thank you for the quick response NMK. I will do all this and post the results!

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Offline ctdls

Re: Zforce 800 Crack but no start
« Reply #3 on: October 07, 2018, 03:49:47 pm »
Are the plugs wet when you checked for spark? I just re read your thread & the plugs are wet.

My WAG is it ran out of air, maybe because of wrong oil in the filter? Maybe a rag sucked into the air intake tube?
ZF 800 LX Trail, stock for now.......not for long.

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Online NMKawierider

Re: Zforce 800 Crack but no start
« Reply #4 on: October 07, 2018, 05:49:22 pm »
Are the plugs wet when you checked for spark? I just re read your thread & the plugs are wet.

My WAG is it ran out of air, maybe because of wrong oil in the filter? Maybe a rag sucked into the air intake tube?
Hadn't thought of that...but it has happened before. Pull that filter, dry the plugs and try it. You didn't spray oil on a paper filter...did you? If so...that'll do it. Doesn't explain the codes though..Hmm.
2015 Z Force 800 (53") EPS -
Custom Air Intakes | Custom Exhaust Mod | SuperATV Harness | Custom Fenders | Custom Skid/Rock Sliders | 27" GBC Grim Reapers | Seizmik Mirrors |Конструктор (Rodin's) Doors | Dr Pulley Sliders | 1.5" Wheel Spacers | BENZ Silencer (as needed) | SATV Flip Windshield W\ Rear Shield | Dual Light Bars | Diamond Plate Storage | Magellan TRX7 GPS| Bandit Springs

My Videos On YouTube

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Offline CCALF

Re: Zforce 800 Crack but no start
« Reply #5 on: October 07, 2018, 08:12:33 pm »
Are the plugs wet when you checked for spark? I just re read your thread & the plugs are wet.

My WAG is it ran out of air, maybe because of wrong oil in the filter? Maybe a rag sucked into the air intake tube?
Hadn't thought of that...but it has happened before. Pull that filter, dry the plugs and try it. You didn't spray oil on a paper filter...did you? If so...that'll do it. Doesn't explain the codes though..Hmm.

Its a uni filter. I have oiled it before with no problems. I had the snorkel running perfectly fine up until i oiled it.

No rag in the intake. i have fully taken apart the throttle body and cleaned it along with the MAF sensor. (Pretty cacked up)

I have ohmed out the TPS, fuel injectors, and spark plug coils which have all test to service manual spec.

I think the oil is causing it to run rich which causes it to flood and that's why the plugs are wet. I wonder how long it would take to vapor off?

I have hooked up the machine to my car and still no success.
I have gotten the machine to gargle while cranking but it wouldnt start.

My thought now is that ive drained the battery to much and the coeds are being thrown because I'm not getting enough voltage to the coils to create a good enough spark. Thus causing the engine to flood repeatedly.

Btw its a 2017 zforce 800.

If it didnt jump with the car is it worth going to get a battery charger? Probally good to have around though.

Thanks again for the responses im just trying to cover all my bases!





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Offline CCALF

Re: Zforce 800 Crack but no start
« Reply #6 on: October 07, 2018, 08:20:26 pm »
Here is a picture of my snorkel set up. The RPM's were exactly the same before and after my new filter set up. Not until I oiled the filter and replaced did it shut off.

Ive tried to start with and without the intake. No luck

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Offline REDRIDER

Re: Zforce 800 Crack but no start
« Reply #7 on: October 08, 2018, 08:08:14 am »
you shouldn't jump these with a car, you can fry electronics with the spike. Get a battery charger and make sure the battery is fully charged up. make sure the plugs are clean and dry and with the fully charged battery give it a try. These are known to not start with a weak battery even when it seems to be turning over ok.
« Last Edit: October 08, 2018, 08:10:01 am by REDRIDER »

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Offline ctdls

Re: Zforce 800 Crack but no start
« Reply #8 on: October 08, 2018, 09:20:53 am »
Connect your DCV meter across the battery & crank it over. If it's dropping way down it will crank & not start.

Not sure with CFMOTO but other manufactures will not let the unit fire if the battery voltage drops below a threshold voltage. The reasoning is the fuel pump won't be able to supply enough pressure.

Plugs can look wet, are they wet with oil or gas is the question. Myself i would shoot raw gas directly into the TB while cranking  just to eliminate all those variables.

I don't like randomly disconnecting things especially electrical with no idea what I'm chasing, you risk introducing other problems.

Get back to basics, fuel, air & spark. If you have those, obstructive air path, raw fuel injected into the TB's & spark......compression of course. Then the next step is the correct timing of the events.
ZF 800 LX Trail, stock for now.......not for long.

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Offline CCALF

Re: Zforce 800 Crack but no start
« Reply #9 on: October 08, 2018, 08:31:49 pm »
Connect your DCV meter across the battery & crank it over. If it's dropping way down it will crank & not start.

Not sure with CFMOTO but other manufactures will not let the unit fire if the battery voltage drops below a threshold voltage. The reasoning is the fuel pump won't be able to supply enough pressure.

Plugs can look wet, are they wet with oil or gas is the question. Myself i would shoot raw gas directly into the TB while cranking  just to eliminate all those variables.

I don't like randomly disconnecting things especially electrical with no idea what I'm chasing, you risk introducing other problems.

Get back to basics, fuel, air & spark. If you have those, obstructive air path, raw fuel injected into the TB's & spark......compression of course. Then the next step is the correct timing of the events.

I have shot starter fluid down while cranking. Shouldnt that have the same effect as gas?

I'm pretty sure the plugs are wet with gas. I'm flooding the engine. It litterally shoulds like it wants to start (gurgles) but as soon as I lay off the ignition it stops.

I recharged the battery fully and no result. The voltage drops to 11v while cranking.

Fuel pump runs fine, sparks seems ok while testing I feel air sucking through the throttle body while I'm cranking.

I havnt yet tested compression... I'm going to end up taking it to the dealer.


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Offline ctdls

Re: Zforce 800 Crack but no start
« Reply #10 on: October 08, 2018, 09:09:56 pm »
Hopefully it's something simple when you take it in. Not sure what else I can suggest you try, I'm guessing you do not have a compression tester.

Have you had any previous issues with the unit?
ZF 800 LX Trail, stock for now.......not for long.

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Offline REDRIDER

Re: Zforce 800 Crack but no start
« Reply #11 on: October 09, 2018, 06:50:11 am »
compression test would be next on the list

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Offline CCALF

Re: Zforce 800 Crack but no start
« Reply #12 on: October 09, 2018, 08:51:20 am »
No issues except flat tires..... We just took it on a 40 miles run in the san Juan mountains last week. Ran great, no issues until the Damn filter oil!

I hope its something simple too. I just bought the machine 3 months ago...

 I appreciate all your help guys, will post back with results as soon as i get something!

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Offline doug80638

Re: Zforce 800 Crack but no start
« Reply #13 on: October 09, 2018, 10:44:02 am »
Symptom: Oiled filter, engine ran for a bit and then stalled and won't start.

My first guess would be that oil got on the T-Map sensor and the sensor is now sending wrong data to the ECM.

First step is to inspect and clean the T-Map sensor. Use a cleaner specifically made for the purpose.
« Last Edit: October 09, 2018, 10:46:26 am by doug80638 »
2017 Zforce 800 - Red
SuperATV Flip windshield
Tusk soft rear window
Twin-Air foam air filter

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Offline REDRIDER

Re: Zforce 800 Crack but no start
« Reply #14 on: October 09, 2018, 10:57:44 am »
you aren't supposed to oil the foam cover on a paper filter. See above post, very likely.