Winder cuts out

[AAdavis]

No, it takes a different tune for the 3 bar vs the 2 bar, the sled will not run properly if you have the wrong map sensor or tune in it.

You can only see over 17 lbs on the dash or logs if you have the three bar tune and map sensor in it.

Ok so according to that I was sold a 3 bar sensor and a 2 bar map. Its runs great on the two bar sensor and I am reading 17lbs of boost on a external gauge.

 

[Another Phase]

I would suspect bad sensor. ECU is confused - some input is out of range or wrong. MAP, boost sensor, etc.

Tried another MAP sensor and no luck. Luckily I was able to borrow one from a friend who added a 3 bar so he let me try his stock sensor.

 

[Another Phase]

sounds like it is going lean. might be fuel pump slowing down or fuel pressure regulator sticking in an open position.

I'm leaning towards fuel pump. It seems to be getting worse and has now started to idle rough and stall with no throttle input, like it's running out of fuel. Level is at 1/2 tank.

 

[ClutchMaster]

I'm leaning towards fuel pump. It seems to be getting worse and has now started to idle rough and stall with no throttle input, like it's running out of fuel. Level is at 1/2 tank.

You can lead a horse too water but you can’t make’em drink!

 

[Erik 295]

Have you tried getting a pressure reading off the fuel rail?

 

[Another Phase]

Have you tried getting a pressure reading off the fuel rail?

No, I don't have the equipment to do that. I'd take it to one of the dealers around here, but they all say they've never heard of this problem. I may be forced to let them have at it, I'm really disappointed with it. Only 1000 miles on it and it ran fine last season. I don't understand what's changed.

 

[ClutchMaster]

No, I don't have the equipment to do that. I'd take it to one of the dealers around here, but they all say they've never heard of this problem. I may be forced to let them have at it, I'm really disappointed with it. Only 1000 miles on it and it ran fine last season. I don't understand what's changed.

Any reason you won’t respond to my first post?

This is free advice from someone who knows a heck of a lot more than you about engine management systems.

The least you could do is answer me?

Yea change the fuel pump, they always cause idle issues......... not.

 

[Erik 295]

No, I don't have the equipment to do that. I'd take it to one of the dealers around here, but they all say they've never heard of this problem. I may be forced to let them have at it, I'm really disappointed with it. Only 1000 miles on it and it ran fine last season. I don't understand what's changed.

I bet you have one maybe two Partially fouled plugs

 

[Erik 295]

I bet you have one maybe two Partially fouled plugs

mine was doing the same thing I took it to the dealer and they changed out the return line to the tank the grommet that goes in the tank is not big enough to return the fuel fastener they had a recall on them only on the ones that had problems

 

[ClutchMaster]

I bet you have one maybe two Partially fouled plugs

He changed them read his second post.

 

[Tarzan]

No, I don't have the equipment to do that. I'd take it to one of the dealers around here, but they all say they've never heard of this problem. I may be forced to let them have at it, I'm really disappointed with it. Only 1000 miles on it and it ran fine last season. I don't understand what's changed.

Take the fuel pump up and check all the fuel fittings is on. and that there is no
crack on rubber/plastick hose that goes out from the fuel pump to the adapter. If you get code 39 or sd25 the engine will go lean and fall. I know some tuners have deleted those codes.

 

[Another Phase]

I assume your not tuned? Stock everything?
It’s possible your O2 sensor has $hit the bed, they are commonly a problem as vehicles age.

Also a bad backfire can ruin the map sensor.

I wouldn’t rule out the fuel pressure regulator, but it’s fairly uncommon they fail. When they do, the diaphragm leaks and floods the engine through the vacuum line, so that’s probably not your issue.

If it were me I would replace the O2 sensor.
Your symptoms are in line with such a failure.

You can disconnect the battery, this will clear the fuel trim table. Upon restarting it should run better for a limited time. That’s the way most vehicles are anyway.

Clutch, I assume this is the first post you're talking about, I had to look back to see. Please understand that I'm not on here all the time and usually by the time I have a chance to check there's a bunch of other posts as well. In the interest of not bogging the thread down I try to respond in a way that answers questions, but doesn't necessarily respond to every individual post.

No disrespect is ever intended. This site is absolutely the best resource for sledders that I have ever seen, and it's because of all the talented individuals who offer insight/knowledge about these sleds. I would never single anyone out or ignore them intentionally. I appreciate all the help and tip my hat to you and everyone else on here.

So to answer your questions:

Sled is 100% stock
No O2 sensor
Replaced MAP sensor so backfire causing issue should be ruled out
Have not changed or tested fuel pressure regulator, but it is not flooding the engine
I have had the battery disconnected multiple times and it seems to make no difference
Level of frustration with this sled - 10 out of 10

 

[Another Phase]

Any reason you won’t respond to my first post?

This is free advice from someone who knows a heck of a lot more than you about engine management systems.

The least you could do is answer me?

Yea change the fuel pump, they always cause idle issues......... not.

Take the fuel pump up and check all the fuel fittings is on. and that there is no
crack on rubber/plastick hose that goes out from the fuel pump to the adapter. If you get code 39 or sd25 the engine will go lean and fall. I know some tuners have deleted those codes.

I've had the fuel pump out and everything looks fine. No codes and no tune.

 

[ClutchMaster]

Clutch, I assume this is the first post you're talking about, I had to look back to see. Please understand that I'm not on here all the time and usually by the time I have a chance to check there's a bunch of other posts as well. In the interest of not bogging the thread down I try to respond in a way that answers questions, but doesn't necessarily respond to every individual post.

No disrespect is ever intended. This site is absolutely the best resource for sledders that I have ever seen, and it's because of all the talented individuals who offer insight/knowledge about these sleds. I would never single anyone out or ignore them intentionally. I appreciate all the help and tip my hat to you and everyone else on here.

So to answer your questions:

Sled is 100% stock
No O2 sensor
Replaced MAP sensor so backfire causing issue should be ruled out
Have not changed or tested fuel pressure regulator, but it is not flooding the engine
I have had the battery disconnected multiple times and it seems to make no difference
Level of frustration with this sled - 10 out of 10

Ok sorry I blew up. I didn’t know your efi doesn’t have a O2 sensor. That’s very weird as my Viper has one. The symptoms are that of a bad O2 sensor, I’m surprised it hasn’t got one due to the fact alcohol is present in some fuels and not in others, along with the fact that the specific gravity is different for gasolines.
Emissions regulations usually dictate that an oxygen sensor is mandatory. So WTF?

Your sled runs on a speed density tune, so a very accurate measurement of absolute manifold pressure is necessary to provide the proper amount of fuel. You said you tried a MAP sensor?

Fuel pressure has to be within a couple pounds also, this could likely be your problem but they usually don’t go bad. If they have a leaking needle and seat you usually have hard starting issues. If there’s a leaky vacuum/pressure line to the regulator, you will get rich conditions while in vacuum and lean conditions during boost so I don’t think that’s the problem.

Fuel pumps doesn’t regulate pressure, if the sled idles badly, or has a stumble under low loads I wouldn’t suspect the pump. They are usually either run or they don’t.

If you have already done the map sensor then the only other sensor that would affect fuel equation is the intake air temperature sensor. This would affect the fuel curve globally, kind of what your describing. There is a resistance measurement you can take on it that should corespond with ambient temperature. I will see if I can find that measurement.

 

[ClutchMaster]

@68 degrees Fahrenheit the sensor should read 12.5k ohms.