I scored a buggy with a 6 ltr and need some help.

When I got it after driving it for around 20 min. it would start to sputter bad so I parked it called the guy I got it from and he told me that the MAF sensor had been an issue in the past. So I buy a new one. Same deal. Runs great 20 min. later sputters something bad. Called the guy back. Said that he programed it to run without the MAF sensor. So I unplug it. Same game. Runs great for 20 min then sputters like crazy.

I'm hauling it or had planned to with my fam on vacation this thursday 1300 miles and I sure don't want to have problems there.

Tonight it did it again after 20 min so I hit my neighbor up for his reader. There are not any codes that flashed????

Please help!!

Thanks in advance!!

Todd

Here is what I have going:

Engine - GM 6.0 LQ4, custom tune – Afco aluminum radiator and Taurus fan

Transmission – TH350 remote cooler with fan



Transfer Cases –

NP203 with Northwest Fab Doubler kit – 27 spline input and 32 spline output

Lomax NP205 3.1 Kit with 32 Spline inputs and outputs

Northwest Fab Triple shifter with cables

It could be a simple filter or venting issue.

Filter = Filter plugs up and collapses from the vacuum of the pump, shutting off the fuel supply. Once the vacuum bleeds off, you get flow again.

Venting is similar, but the issue is no air is getting into the tank and the engine stumbles/quits once you build up enough of a vacuum.

Good luck

I was gonna say, kinda sounds like a clogged fuel filter. Is it a normal filter or a corvette filter/regulator?

What fuel system are you running, pump, filter/reg and return or returnless fuel rails? Is it DBW or cable?

Could be fuel related. Check fuel pressures at the rail.

Also, might want to check the tune. I would have someone to tune it again and check the MAF and add it back in. Find a local tuner with HPtuners or EFIlive. Or call Jims Performance

Also check all the sensors for loose connections or wires. Remove the intake tube and inspect the TB for cleanliness.

When it sputters is there smoke coming out of the exhaust? That could be caused by an exhaust leak. The O2's will see the extra oxygen and think it's running lean. Might try unplugging the O2 sensors and seeing if that clears it up. Other things to check are temp sensors.

You will really benefit from having a good scanner that can show/log data in real time like EFILive's Scan Tool.

http://www.efilive.com/index.php?Itemid=128&id=119&option=com_content&view=article

With no codes, I would lean (no pun intended ) toward fuel delivery also..

does it just start to run like crap or is it only when you are on the gas that it runs like crap. if it only runs like crap when you are giving it gas it could be a fuel pump. Yank the fuel filter and put in an inline. that will let you know easily.


micky

Bought a new fuel pump and filter today. Made a big difference but after 20 min same thing. Today I had a few buddys over it is drive by wire (for now). It's an inline pump with a cell. It has a master shut off and that was wipeing out the codes. We went to look at the plugs which were the stock plugs and one side had a lot of oil build up. Then we noticed that the plug wire was broken on the coil. It had been running off of 7 cyl and I'm guessing that cyl was filling up with gas (after 20 min) then the sputtering would kick in. We could smell fuel something bad. Tomorrow it gets all new plugs, wires and a new coil. I pray that fixes it as I'm looking forward to our haul.

Thanks for the info up to this point guys! If someone doesn't think that wire not hooked up would cause this and has any other suggestions I'd be open to hearing them. Fuel pressure is good and remains good even after shut off. The new fuel pump is much stronger and until it did it's sputtering I can tell a HUGE dif. with it

I didn't know you were using the master cutoff on it all the time. I put that on so I could race Moroc (rules) and never use it. You don't need to use it unless you're going to store it for months. Leave it on and see if you get any codes after a few runs.

I didn't know you were using the master cutoff on it all the time. I put that on so I could race Moroc (rules) and never use it. You don't need to use it unless you're going to store it for months. Leave it on and see if you get any codes after a few runs.

We figured that out. That the master was reseting the computer. Lastnight we left it on then it started flashing, the mixture was off. I was thinking HUGE problems. But when I went to pull a plug I noticed that the wire fell off in my hand. Handed it to a buddy and he noticed that is was broken. If it were only running on 7 I'm thinking that's my problem.:D

When we pulled the plugs there is no doubt one entire bank was getting WAY to much oil. Picked up a new set of plugs and wires today as well as a new coil. I'm thinking we have it whipped now. We thought it was a fuel issure but the fuel pressure was good and was holding good after shut off. I ditched the filter before the pump and changed the one after it as well as bought a new pump and ran some new line. Not much longer it will be all new:grinpimp:

Dan I appriciate you letting me bounce all of my questions off of you. The part that sucked the most is that it wouldn't do it until 15-20 min of getting with it (Wondering if that wire to the coil wasn't getting hot enough it would not make conection or if that cyl. would fill up with fuel). My neighbors have a hit out on me:flipoff2: If you left it run thinking it would do it at idle it wouldn't happen. Or not after 20 min. anyhow. The new fuel pump made a HUGE difference but that wasn't the problem. All I want is for it to run right before I load up the kids and wife and head for Ouray. But I think we have it figured out. Thought it had to be something somewhat simple if it didn't do it when you had it but did on me. Thanks again for letting me bounce all my dumbass questions off of ya

Had my buddys over tonight again. I put the new plugs in, new coil that was broken and new wires. Took it out and SAME THING. 20 Min. into it is starts to cut out and run like a dog.

Got it back and the pass bank was all oil fouled again. Drivers side looked good.

We did notice that the wires on the O2 sensor had come in cotact with the exaust so I made another trip to the parts store and picked up a new universal o2 sensor. The one we took out was in BAD shape. 100% cloged up. We have wired in the new one but I'll have to wait for the AM until I have time to take it out and see if that was the fix. Here is the run down of new parts.

MAF sensor,fuel pump and fuel filter, Coil, wires, plugs and now O2 sensor.

Any ideas if this doesn't get it???

So, what does an oxygen sensor look like?













































:flipoff2:

So, what does an oxygen sensor look like?
:flipoff2:

I didn't want to start posting up pics in my help thread, Jerky.

But if you want to see it I'll gladly post up some pics tomorrow:flipoff2:

I didn't want to start posting up pics in my help thread, Jerky.

But if you want to see it I'll gladly post up some pics tomorrow:flipoff2:

:laughing:

Let me know if she runs for more than a shake. Can I tell everyone about the blast down the highway at 60? I'm glad I remembered my sunglasses. :laughing:

Alright Andy. Here is your picture:flipoff2:
http://i161.photobucket.com/albums/t213/406yj/O2%20Sensor/SportsWorld042.jpg

After a Sh!t load of parts this is all that is was. An O2 sensor. All in all I'm glad it happened. Motor still had stock plugs.
(old) Drivers side
http://i161.photobucket.com/albums/t213/406yj/O2%20Sensor/SportsWorld036.jpg
(old) pass. side
http://i161.photobucket.com/albums/t213/406yj/O2%20Sensor/SportsWorld032.jpg
Replaced a coil that was broken.
http://i161.photobucket.com/albums/t213/406yj/O2%20Sensor/SportsWorld041.jpg
Got new plugs.
http://i161.photobucket.com/albums/t213/406yj/O2%20Sensor/SportsWorld037.jpg
http://i161.photobucket.com/albums/t213/406yj/O2%20Sensor/SportsWorld040.jpg
New Wires (These had to be returned as they gave the the wrong ones, to short)
http://i161.photobucket.com/albums/t213/406yj/O2%20Sensor/SportsWorld034.jpg

New Fuel Pump and Filter
http://i161.photobucket.com/albums/t213/406yj/O2%20Sensor/SportsWorld038.jpg
MAF sensor
(old)
http://i161.photobucket.com/albums/t213/406yj/Buggy%20MAF/BuggyMAF7-29-09012.jpg
New MAF
http://i161.photobucket.com/albums/t213/406yj/Buggy%20MAF/BuggyMAF7-29-09017.jpg


All of that over a fricking O2 sensor:shaking:

Now I know what's new and what isnt' :D

My 3 yr old girl had been looking out the back window for the past 3 nights. Staying up for me to get into the house and the first thing she would say is "Daddy is the monster truck ready for our trip?" It killed me......

I'm proud to say it is on the trailer and ready to do some wheeling in Colorado this weekend.

What i have learned. I would have gotten a reading much earlier had I not used the master shut off when turning it off. 6.0's are power houses but sensitive b!tches. Without good friends you are dead in the water.

I kinda had a feeling it was O2 related. I fought a problem like that recently. Ran great for 20 minutes then major problems. Mine turned out to be a tiny exhaust leak that you couldn't even hear. Good to know you got it!

A little late to the table, but I was going to say that likely what was happening during the first 20 minutes of running the engine was cold and running in open loop mode. Meaning it is operating off a preset table of values and NOT reading any of the sensors such as the O2 and making adjustments. Once warmed up the engine goes into closed loop mode and starts relying on signals from the sensors to adjust how it runs.......and as you found out the O2 sensor was giving a bad signal.

As a side note I would verify if the calibration was actually using the MAF or not. Suppose you could have a preset table of values to use versus actual sensor reading but I don't know why you would want to. You are heading back to old-school carb days by doing this.

Well at least it has a tune up now.

Also I would like to know with the E3 plugs work out.

If it doesn't see the MAF it would stay in open loop/SD correct?

Todd

I don't know what kind of luck everyone else has had with Airtex pumps, but my hot rod buddy told me not to waste my time with them. I bought one anyway, it worked for about 40 miles before it took a crap.

I have since replaced it with a Walbro pump.



edit: E8248 was the model i had that didnt last

Todd

I don't know what kind of luck everyone else has had with Airtex pumps, but my hot rod buddy told me not to waste my time with them. I bought one anyway, it worked for about 40 miles before it took a crap.

I have since replaced it with a Walbro pump.



edit: E8248 was the model i had that didnt last

Funny. I've read quite the opposite here on pirate and in my own personal experience I never had a problem. I replaced the E2000 with the E8248. There are countless different ways to set up fuel systems. Without comparing apples to apples it is really fruitless to say why one would fail.

Ya, I do agree, apples to apples.

I heard that specifically its the airtex pumps. I don't know if that number croses over between brands or not.

I discuraged it until it happened to me.

I was told that airtex bought out a diffrent company and is not making the same quailty pumps.

I hope nothing happens to it, I hope I am wrong. I just figured I would offer up my .02.

This is my old buggy and it will run with or without the MAF, its jus snappier with it. I've ran it both ways and the difference is just barely noticeable.

I ran an e2000 on the 5.3 that was in the buggy for years with no prefilter even. I stepped up to the 8248 just from recommendations from pirate and because I went to the 6.0. I would run anything else simply because of how easy it is to get one if they break.

I imagine that the 02 sensor got clogged from oil when I rolled it at MOROC, it smoked out that side pretty bad.

My 3 yr old girl had been looking out the back window for the past 3 nights. Staying up for me to get into the house and the first thing she would say is "Daddy is the monster truck ready for our trip?" It killed me......




LOL that thing does look like a monster truck without a body :D :flipoff2:

LOL that thing does look like a monster truck without a body :D :flipoff2:


Funny thing is. The girls slept most of the run. :eek:I don't know how:eek:

http://i161.photobucket.com/albums/t213/406yj/OURAY%20COLORADO/OurayCO8-16-09053.jpg

Good Times!!!
http://i161.photobucket.com/albums/t213/406yj/OURAY%20COLORADO/OurayCO8-16-09071.jpg

http://i161.photobucket.com/albums/t213/406yj/OURAY%20COLORADO/OurayCO8-16-09057.jpg

http://i161.photobucket.com/albums/t213/406yj/OURAY%20COLORADO/OurayCO8-16-09055.jpg

FYI. Don't take a buggy down the main drag of the town of Ouray, CO unless you want to get pulled over and have to drive it back only to trailer it to the trail:flipoff2: Dude was our neighbor and still wouldn't let it slide
http://i161.photobucket.com/albums/t213/406yj/OURAY%20COLORADO/OurayCO8-16-09049.jpg