SMG Flex fuel kit issues

Adampau123 · 02-04-2021, 09:28 AM

Has anyone had issues with this kit? Have had ethanol content readings rising during pulls.. for example starts at 77% and end of pull is up to 80% sometimes 85% causing the car to go rich. Also started missfiring recently but only intermittent, not always. When it miss fires it shows cylinder #6, too much of a coincidence that this is where the harness for the kit taps into.. Going to be doing some testing tonight to see if it is a faulty harness, possibly try to tap into #8 instead and see if the miss fire moves.

bjbonentte · 02-04-2021, 09:40 AM

the sensor is GM. I would check all connections and maybe swap out the sensor and see what happens.

Adampau123 · 02-04-2021, 09:42 AM

I would assume if it were the sensor itself it would just not read though.. readings are always good out of wot where it sometimes shoots up

bjbonentte · 02-04-2021, 09:48 AM

if the sensor and the harness works it works. I don't know how the wires would cause an issue like that unless one of the connections is not on all the way. the power comes from the injector harness. Could there be bad connection and when the voltage raises on the injector plug it causes the reading to change.

NYblack1le · 02-04-2021, 11:10 AM

Order the power harness from gen5diy. Eliminates plugging into the coil pack. Had a misfire issue with my dsx kit and it fixed my problems.

https://www.gen5diy.com/collections/...-power-harness

jimadvig · 02-04-2021, 11:24 AM

Quote:

Originally Posted by NYblack1le

Order the power harness from gen5diy. Eliminates plugging into the coil pack. Had a misfire issue with my dsx kit and it fixed my problems.

https://www.gen5diy.com/collections/...-power-harness

This is the kit I have and I have never had a problem with it at all in over a year or more since I installed it. It plugs into the evap solonoid instead of a coil.

Adampau123 · 02-04-2021, 11:42 AM

Thanks guys... will figure it out tonight and get back with the results

Clos.95 · 02-04-2021, 02:44 PM

I just made a thread on this like 5 days ago lol
My car has the same issue, my “kit” isn’t branded it’s just a gm sensor and the rest of the parts were put together by my old tuner.
Ill also see 5% differences from cruising to full throttle.
I can confirm that the smg kit should only move around about 1% if that. I plugged my friends car to Hp tuners to check out how his sensor reads, we pump at the same station and have been for months. Our local station has E81 fuel, and his smg kit reads E81 and his kit is constant doesn’t fluctuate. Mine will read anywhere from E75-E82.

Adampau123 · 02-05-2021, 02:03 PM

So did some testing yesterday. Unplugged the harness completely and deactivated the sensor in the tune and car still had the issue in #6. Swapped plug wires and still stayed the same. Changed to fresh plugs, even went NGK rather than the stock plugs I’ve been running and partial throttle issue went away, however still broke up WOT with the colder plug and smaller gap. Ended up throwing in some fuel system cleaner and topping off with a little over a half tank of 93 and issues are completely gone.... tank is at E40 right now and did about 10 pulls without issue. My sensor reads low but was reading the E I had around 80 percent and the pump consistently reads at about 90 percent. I was told maybe with these colder temps in Florida (40-50) the car was having an issue completely burning ethanol as high of content as 90%

02-04-2021, 09:28 AM	#1
Adampau123 Drives: 2017 Red Hot 1SS 1LE Join Date: Aug 2016 Location: Orlando Florida Posts: 187	SMG Flex fuel kit issues Has anyone had issues with this kit? Have had ethanol content readings rising during pulls.. for example starts at 77% and end of pull is up to 80% sometimes 85% causing the car to go rich. Also started missfiring recently but only intermittent, not always. When it miss fires it shows cylinder #6, too much of a coincidence that this is where the harness for the kit taps into.. Going to be doing some testing tonight to see if it is a faulty harness, possibly try to tap into #8 instead and see if the miss fire moves.

02-04-2021, 09:40 AM	#2
bjbonentte Drives: 2019 Chevrolet Camaro Join Date: Mar 2020 Location: Lantana, TX Posts: 77	the sensor is GM. I would check all connections and maybe swap out the sensor and see what happens.

02-04-2021, 09:42 AM	#3
Adampau123 Drives: 2017 Red Hot 1SS 1LE Join Date: Aug 2016 Location: Orlando Florida Posts: 187	I would assume if it were the sensor itself it would just not read though.. readings are always good out of wot where it sometimes shoots up

02-04-2021, 09:48 AM	#4
bjbonentte Drives: 2019 Chevrolet Camaro Join Date: Mar 2020 Location: Lantana, TX Posts: 77	if the sensor and the harness works it works. I don't know how the wires would cause an issue like that unless one of the connections is not on all the way. the power comes from the injector harness. Could there be bad connection and when the voltage raises on the injector plug it causes the reading to change.

02-04-2021, 11:10 AM	#5
NYblack1le Drives: 2018 1SS 1LE Join Date: Dec 2012 Location: NY Posts: 395	Order the power harness from gen5diy. Eliminates plugging into the coil pack. Had a misfire issue with my dsx kit and it fixed my problems. https://www.gen5diy.com/collections/...-power-harness

02-04-2021, 11:42 AM	#7
Adampau123 Drives: 2017 Red Hot 1SS 1LE Join Date: Aug 2016 Location: Orlando Florida Posts: 187	Thanks guys... will figure it out tonight and get back with the results

02-04-2021, 02:44 PM	#8
Clos.95 Drives: Black 1SS Join Date: Dec 2018 Location: Los Angeles Posts: 103	I just made a thread on this like 5 days ago lol My car has the same issue, my “kit” isn’t branded it’s just a gm sensor and the rest of the parts were put together by my old tuner. Ill also see 5% differences from cruising to full throttle. I can confirm that the smg kit should only move around about 1% if that. I plugged my friends car to Hp tuners to check out how his sensor reads, we pump at the same station and have been for months. Our local station has E81 fuel, and his smg kit reads E81 and his kit is constant doesn’t fluctuate. Mine will read anywhere from E75-E82.

02-05-2021, 02:03 PM	#9
Adampau123 Drives: 2017 Red Hot 1SS 1LE Join Date: Aug 2016 Location: Orlando Florida Posts: 187	So did some testing yesterday. Unplugged the harness completely and deactivated the sensor in the tune and car still had the issue in #6. Swapped plug wires and still stayed the same. Changed to fresh plugs, even went NGK rather than the stock plugs I’ve been running and partial throttle issue went away, however still broke up WOT with the colder plug and smaller gap. Ended up throwing in some fuel system cleaner and topping off with a little over a half tank of 93 and issues are completely gone.... tank is at E40 right now and did about 10 pulls without issue. My sensor reads low but was reading the E I had around 80 percent and the pump consistently reads at about 90 percent. I was told maybe with these colder temps in Florida (40-50) the car was having an issue completely burning ethanol as high of content as 90%

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