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cck2 wrote:i have a toyota fielder cvt tranny with cng and it jerks alot
went back bermac they telling me after the put it in
o yes cvt does do that and they dont know why
sMASH wrote:what does reducing the gap do?
nemisis wrote:nervewrecker wrote:You never hear these kinda stories at dumore. Customer service is always top off the line. Techs are certified and take great care in their installs. They usually take everything into consideration and fabricate stuff if needed. They take the car for a spin and make sure its tuned properly.
i Have personally and stilllll have a jerking issue with a dumore instal. Their customer service is good yes ( hence why you not hearing about these things by dumore) but that doesn't mean there are not any issues. Things i have done outside of having dumore go over the settings include changing coil packs and spark plugs. Still getting jerky drive and severe loss of power on inclines. None of these issues occur on super. The Quality of life with respect to driving since cng has been horrible but the fuel costs............
I agree with what you're saying but tuning the spark plug is common for every IC engine and depends on both how the engine runs AND how you operate it.jerry88 wrote:sMASH wrote:what does reducing the gap do?
It reduces the amount of power required to activate the spark plug to burn CNG and eliminate the misfiring that causes the and jerking.
I have cng for the past 2 years and works excellent.
Before attempting to gap any DENSO Iridium Power spark plug, please review the specification chart in the front of this catalog to verify the factory-preset gap. In most cases your Iridium Power plugs do not need to be gapped. Even with small variations in the factory set gap the ultra-efficient firing power design will compensate for those small variations. Should you decide to re-gap your Iridium Power plug, use extreme caution as improper gapping may damage or destroy the Iridium center electrode or porcelain center.
https://densoautoparts.com/spark-plug-installation
maj. tom wrote:In modern gasoline engines, some of them state on the cover and in the manual do not gap the iridium spark plugs. They state a very specific spark plug code for the iridium Denso or NGK in the user manual. Especially Honda engines.
And i'm reading that it may be unwise to gap iridium spark plugs unless you really have to, because if it's wrong it will destroy the core. So make sure you're very precise and fit the exact specs when doing it.Before attempting to gap any DENSO Iridium Power spark plug, please review the specification chart in the front of this catalog to verify the factory-preset gap. In most cases your Iridium Power plugs do not need to be gapped. Even with small variations in the factory set gap the ultra-efficient firing power design will compensate for those small variations. Should you decide to re-gap your Iridium Power plug, use extreme caution as improper gapping may damage or destroy the Iridium center electrode or porcelain center.
https://densoautoparts.com/spark-plug-installation
sMASH wrote:the station not making enough cng sales to sustain all those salaries. remember it was the ttec bill for the compressor that cause them to shut down the last time.
no volume, no profit, take a two weeks for corona.
nemisis wrote:A problem unique to this station. And if that was the stance how hard is it to have a release or sign up. You have physically go and ask the watchman staff if they have any idea what's going on.sMASH wrote:the station not making enough cng sales to sustain all those salaries. remember it was the ttec bill for the compressor that cause them to shut down the last time.
no volume, no profit, take a two weeks for corona.
dreamyn wrote:Thinking about installing a CNG kit into my Tiida HATCHBACK, anyone did this and got any advice?
agent007 wrote:This coil pack failure thing is no joke nah. Based on what I am hearing, Elantra's and Cerato's that converted to CNG has almost a 100% failure rate. What about the added weight on the rear springs and shocks? The necessary camber/toe adjustments for the back wheels if necessary? How do you all feel with your carpeting being dug up and holes drilled into the unibody frame? Some people lose the fold-down back-seat/trunk pass through feature and really, how do you all feel about that pressurized tank mere inches away from the spine of a back seat occupant? What about rear crumple zone deformation, how would the tank and brackets affect the body's ability to deform in a calculated way in the event of a severe rear impact?
Selling a used CNG retrofitted vehicle is buying into trouble.
kamakazi wrote:Care to elaborate on coil pack failures... That sounds strange unless they need to work it harder cause it is harder to create a spark.agent007 wrote:This coil pack failure thing is no joke nah. Based on what I am hearing, Elantra's and Cerato's that converted to CNG has almost a 100% failure rate. What about the added weight on the rear springs and shocks? The necessary camber/toe adjustments for the back wheels if necessary? How do you all feel with your carpeting being dug up and holes drilled into the unibody frame? Some people lose the fold-down back-seat/trunk pass through feature and really, how do you all feel about that pressurized tank mere inches away from the spine of a back seat occupant? What about rear crumple zone deformation, how would the tank and brackets affect the body's ability to deform in a calculated way in the event of a severe rear impact?
Selling a used CNG retrofitted vehicle is buying into trouble.
kamakazi wrote:So I think I have found my answer and it is a couple of things.
Recommendations by autolite for CNG converted vehicles include:
Colder heat range plugs; which leads me to believe that it runs slightly hotter which could be because it runs leaner and there is no cooling effect from liquid fuels)
Fine tip iridium electrode and
Narrower plug gap (because it is harder to ignite, narrowing the gap and having finer electrode tips gives the coil less of a challenge to create the spark. The more durable iridium alloy allows the set spark plug gap to be maintained over a longer period of time which will require less removal and checking, and not significantly increase the load on the coil as the combustion events add up)
I have to say the theory on improperly torqued spark plugs affecting its resistance sounds really really really far fetched.
If anything improperly tightened plugs allowing combustion gases to escape can expose them them to unnecessary heat which will definitely shorten their lifespan. Resistance is mostly affected by the spark plug gap
The statement that you quoted that because something is harder to ignite it must leave deposits. That logic is a bit too simple to apply here.
In this case specifically we are looking at octane rating. The octane rating of diesel fuel is much lower than that of CNG (which is predominately methane). You don't really have to guess which one burns cleaner.
To add to the complexity different isomers of octane have a different octane rating.
Ted_v2 wrote:What coilpacks you does use guys?
foreign used?
brand new wingwong from a partsplace?
or genuine from a dealer?
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