I think it is with the Vance & Hines as I have cobra intake, swepts and tuner. The bike runs like a dream.
Running lean with Cobra Fi2000. What gives?
Well, guys, I put my shiny new exhaust on earlier this week and now there's trouble. A little background:
I drilled my stock exhaust a bit at first, no issues there. Then I got the Fi2000 CVT, installed that. No issues there. The old butt-dyno even told me it did some good with the low-rpm lugging through town.
Next I got the Baron's BAK put on there. That was a bit disappointing. The holes in the cover plate weren't tapped properly - I had to tap them out myself. For what that thing costs, you'd figure... well, anyway, I thought it made throttle response a bit snappier through the whole range.
Now, for the bit where it turns bad. I finally got my V&H Twin Slash Staggered pipes. In black. I put them on without any issues. They look fantastic. They sound great. But the bike's performance has gone a bit strange. It misses at odd times. Weird flat spots. If I'm accelerating hard through the gears, it's got some serious oomph and no issues. If I'm just cruising at 60 in 5th, it misfires at random.
It got really bad this morning when I was putting around in 2nd gear, 30-40mph. It was stuttering so bad I thought it was going to keel over. Quite a jerky ride. So I got home this morning and checked the spark plugs, and they're very, very white.
Obviously, I've got a problem. The question is, what else should I check before I start making angry calls to Cobra?
I drilled my stock exhaust a bit at first, no issues there. Then I got the Fi2000 CVT, installed that. No issues there. The old butt-dyno even told me it did some good with the low-rpm lugging through town.
Next I got the Baron's BAK put on there. That was a bit disappointing. The holes in the cover plate weren't tapped properly - I had to tap them out myself. For what that thing costs, you'd figure... well, anyway, I thought it made throttle response a bit snappier through the whole range.
Now, for the bit where it turns bad. I finally got my V&H Twin Slash Staggered pipes. In black. I put them on without any issues. They look fantastic. They sound great. But the bike's performance has gone a bit strange. It misses at odd times. Weird flat spots. If I'm accelerating hard through the gears, it's got some serious oomph and no issues. If I'm just cruising at 60 in 5th, it misfires at random.
It got really bad this morning when I was putting around in 2nd gear, 30-40mph. It was stuttering so bad I thought it was going to keel over. Quite a jerky ride. So I got home this morning and checked the spark plugs, and they're very, very white.
Obviously, I've got a problem. The question is, what else should I check before I start making angry calls to Cobra?
21 - 40 of 59 Posts
Does it ever pop on hard decell ?Bozzly said:I think it is with the Vance & Hines as I have cobra intake, swepts and tuner. The bike runs like a dream.
Has anyone tried the L&M Fuel Pack?..they were the one's that installed the V&H!!!
Also, kinda didn't think we would need a regulator of sorts if we just installed the pipes?
Yes, for both pipes and air ,but didn't think for just pipes. Can anyone clarify pls??
TKS
Also, kinda didn't think we would need a regulator of sorts if we just installed the pipes?
Yes, for both pipes and air ,but didn't think for just pipes. Can anyone clarify pls??
TKS
Okay, on the way home I redlined the first four gears as instructed to do by Andre at cobra. Okay, maybe he said close to redline but I wanted to be sure. From what I can tell so far is the popping on decel has been pretty much eliminated. I will confirm tomorrow on my way to work. The only remaining issue is the "missing" when cruising at 33-34mph in second gear.
ok, you caught me Clar, If I hammer it hard then quickly decel, I get more of a growl then a backfire or pop. I rarely really ride that way. I try to be pretty steady on the throttle, Now it does pop once in a while but hardly ever, maybe I just don't ride it hard enough to get it.clar2001 said:Does it ever pop on hard decell ?Bozzly said:I think it is with the Vance & Hines as I have cobra intake, swepts and tuner. The bike runs like a dream.
Most of the time mine just growls to if its a hard enought decell at any speed it will pop once and a while.Bozzly said:ok, you caught me Clar, If I hammer it hard then quickly decel, I get more of a growl then a backfire or pop. I rarely really ride that way. I try to be pretty steady on the throttle, Now it does pop once in a while but hardly ever, maybe I just don't ride it hard enough to get it.clar2001 said:Does it ever pop on hard decell ?Bozzly said:I think it is with the Vance & Hines as I have cobra intake, swepts and tuner. The bike runs like a dream.
The first time I talked to Phil at cobra they e-mailed a page related to exaust leaks ,I have taken my exaust off twice and with a streight edge planed my header flanges & installed new gaskets made no difference, unless I did not correct the issue, but since there are several of us having this issue, I can't beleive we all have exaust leaks.
So I waiting to see what cobra says , I have little faith in any resove here , I wondering if there is a softer gasget I could install to try to correct/resolve this issue make sure there is no leak, the bike runs great it just that pop that bothers me.
Clar it does sound like it happens more frequent with the Vance & Hines than with the cobras.
Having same issues, popping on decel and missing at different speeds. I have talked with Phil awhile ago and he sent me a new unit. After this install the bike has the same problems. So, I was thinking about how it monitors the air anf fuel ratio.. I know that is monitors the o2 sensor, but shouldn't it also be monitoring the air coming into the engine?? On most fuel injected vehicles they have a MAF (Mass Air Flow) and o2 sensors which are used to properly adjust the air to fuel ratio... I wondering if the ECU and Cobra AT are having difficulties and are trying to compensate for one another.
I could be way off, but it makes sense to me... Please correct me if I am wrong.
I could be way off, but it makes sense to me... Please correct me if I am wrong.
I have the Vance and Hines 2 and 2 and the fuelpak. I took the fuelpak off and the bike runs that same. Still pops everytime between 45-60mph on decel. And misses in first gear around 20mph. All that started happening after I installed the pipes. I'm stuck don't know what to do 
Theres three different efi setups - Alpha-N that uses throttle position to calculate load along with rpm and then theres speed density that uses rpm, 02 and manifold vacume/pressure and then there Mass flow it uses a mass air flow along with rpm and all the other sensors. Our bikes use the Speed Density system so no mass airflow to calculate air but with knowing the pressure of the intake and the volume-metric efficiency of the engine along with the rpm you can calculate how much air is in the cylinders. How the cobra system work (my theory) since it doesn't communicate with the ecu but reads the 02 sensor and the signal that the ECU sends to the injectors. all it does is figure if the engine is running lean or rich and decide if the ecu is giving a long or short enough fuel injector pulse if not it decides to lengthen or shorten the injector pulse from what the ECU want to correct the issue.UrbanRage said:Having same issues, popping on decel and missing at different speeds. I have talked with Phil awhile ago and he sent me a new unit. After this install the bike has the same problems. So, I was thinking about how it monitors the air anf fuel ratio.. I know that is monitors the o2 sensor, but shouldn't it also be monitoring the air coming into the engine?? On most fuel injected vehicles they have a MAF (Mass Air Flow) and o2 sensors which are used to properly adjust the air to fuel ratio... I wondering if the ECU and Cobra AT are having difficulties and are trying to compensate for one another.
I could be way off, but it makes sense to me... Please correct me if I am wrong.
Thanks for the info. So do you think that if it was to communicate with the ECU it would correct these problems?Yosemite said:Theres three different efi setups - Alpha-N that uses throttle position to calculate load along with rpm and then theres speed density that uses rpm, 02 and manifold vacume/pressure and then there Mass flow it uses a mass air flow along with rpm and all the other sensors. Our bikes use the Speed Density system so no mass airflow to calculate air but with knowing the pressure of the intake and the volume-metric efficiency of the engine along with the rpm you can calculate how much air is in the cylinders. How the cobra system work (my theory) since it doesn't communicate with the ecu but reads the 02 sensor and the signal that the ECU sends to the injectors. all it does is figure if the engine is running lean or rich and decide if the ecu is giving a long or short enough fuel injector pulse if not it decides to lengthen or shorten the injector pulse from what the ECU want to correct the issue.UrbanRage said:Having same issues, popping on decel and missing at different speeds. I have talked with Phil awhile ago and he sent me a new unit. After this install the bike has the same problems. So, I was thinking about how it monitors the air anf fuel ratio.. I know that is monitors the o2 sensor, but shouldn't it also be monitoring the air coming into the engine?? On most fuel injected vehicles they have a MAF (Mass Air Flow) and o2 sensors which are used to properly adjust the air to fuel ratio... I wondering if the ECU and Cobra AT are having difficulties and are trying to compensate for one another.
I could be way off, but it makes sense to me... Please correct me if I am wrong.
no... thats a whole different ball game when you start actually talking with the ecu. And in our case its not really needed but would be nice since it would open up ignition timing changes and ability to change to other conditions such as temp and air density. and It would be cool to see a stand alone unit for bikes that opens up a whole world of possibilities. Im sure a current stand alone ecu would work just need alittle fab for the sensors mainly crank triggers. But not really needed for how our bikes are used...
You really should have gotten the PCV then man! Its got a couple analog inputs for temperature/boost or whatever.Yosemite said:no... thats a whole different ball game when you start actually talking with the ecu. And in our case its not really needed but would be nice since it would open up ignition timing changes and ability to change to other conditions such as temp and air density. and It would be cool to see a stand alone unit for bikes that opens up a whole world of possibilities. Im sure a current stand alone ecu would work just need alittle fab for the sensors mainly crank triggers. But not really needed for how our bikes are used...
Dose your bike cut in and out at certain speeds? Hows the popping on decel?Natedog said:You really should have gotten the PCV then man! Its got a couple analog inputs for temperature/boost or whatever.Yosemite said:no... thats a whole different ball game when you start actually talking with the ecu. And in our case its not really needed but would be nice since it would open up ignition timing changes and ability to change to other conditions such as temp and air density. and It would be cool to see a stand alone unit for bikes that opens up a whole world of possibilities. Im sure a current stand alone ecu would work just need alittle fab for the sensors mainly crank triggers. But not really needed for how our bikes are used...
I have a CA. Model with the closed loop crap wonder if that makes a difference?
If and when my balls get big enough to build the turbo system for the bike that I want to do. I will switch to the PCV. Until then I like the plug and play of the cobra. In fact I like it so much its still in the box waiting for and exhaust/intake system worthy of it. And when I have my bike back for more than a week at a time. The list of mods is long... but the funding is short. So its pick and chose one at a time.Natedog said:You really should have gotten the PCV then man! Its got a couple analog inputs for temperature/boost or whatever.
Only real difference is the EVAP Canister (big black ugly thing by left foot) remove it. Other than that its the same. There all closed loop.clar2001 said:I have a CA. Model with the closed loop crap wonder if that makes a difference?
Cobras sending me another motherboard. Not sure it's gonna help since it didn't fix the problem for a few others on here.
Cobra called me this morning and they want me to do an experiement. They want me to unplug the powerpro from the O2 sensor and plug the ECU back into the O2 sensor. If it doesn't fix the problem then it means the issue is in the Powerpro and they will widen the band for the sensor. I will try to get to it this evening. Hope it creates a solution.
Are you talking with Phil from Cobra?midlifecrisis said:Cobra called me this morning and they want me to do an experiement. They want me to unplug the powerpro from the O2 sensor and plug the ECU back into the O2 sensor. If it doesn't fix the problem then it means the issue is in the Powerpro and they will widen the band for the sensor. I will try to get to it this evening. Hope it creates a solution.
Not directly. I'm talking with Mike who said he, Phil, and some of the other engineers are working to solve this issue. They acknowledged I was not the only one having this issue.
21 - 40 of 59 Posts
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