MAF problems

[wade w]

I think my maf is starting to peg. I just changed my plugs at work and I streached it out on the way home. it would start to mis at the top of third. It took it a while to straigten out. After it straightened out I tryed it again and it done the same thing. the temp was 65. :? any sugestions. will it need a new tune.

[Slowleen]

i've seen poeple take the electronics out of the housing, and clean the little wire that does the reading with some electrical cleaner on a q-tip. Dont know if thats a good/bad idea in the end, but i've seen it done, just got to be gentle

[chrisheltra]

With the colder weather coming and you having a 6# lower I would highly suggest getting either a Mafia or a SCT BA2800, and a tune. Trust me there is atleast one member on here that we told him to do that and he didnt and his motor blew. This time of year is when you start to hear about motor blowing on NLOC and SVTP and it doesnt stop untill about March-April when the weather stars warmng up.

[wade w]

Thanks for the input. So does that sound like what it was doing.

[chrisheltra]

Do you have a hand held tuner? If so I would datalog you truck and save the datalog and see if you can post up the file so we can all take a look at it.

[Whaler]

Have you checked your fuel pressure? Have you changed your fuel filter recently? It could also be spark plug blowout. Spark plug gap? With a 6lb lower, most recommendations are to gap the plugs no more than .035 .

[wade w]

yes it does have a hand held. it's a sct. Ill see if I can do what youre taking about. do you have to keep it pluged in while you drive it. I havent
changed the fuel filter. i gaped the plugs 40. but the old plugs were a lot
more. Ive only had the truck 7months. witch is why I havent changed the
filter. To be honest I havent thought about it. I wasnt sure how much to gap the pugs. the factory thing said 42-46. so I figured 40 was good. it is the first time Ive chenged them.

[chrisheltra]

yes it does have a hand held. it's a sct. Ill see if I can do what youre taking about. do you have to keep it pluged in while you drive it. I havent
changed the fuel filter. i gaped the plugs 40. but the old plugs were a lot
more. Ive only had the truck 7months. witch is why I havent changed the
filter. To be honest I havent thought about it. I wasnt sure how much to gap the pugs. the factory thing said 42-46. so I figured 40 was good. it is the first time Ive chenged them.

Datalogging is a little difficult to do with the SCT compared to the Predator. Next time your around Ill set you up on my laptop.

I would also do what larry is talking about regapp the plufs and change your furl filter.

[Whaler]

yes it does have a hand held. it's a sct. Ill see if I can do what youre taking about. do you have to keep it pluged in while you drive it. I havent
changed the fuel filter. i gaped the plugs 40. but the old plugs were a lot
more. Ive only had the truck 7months. witch is why I havent changed the
filter. To be honest I havent thought about it. I wasnt sure how much to gap the pugs. the factory thing said 42-46. so I figured 40 was good. it is the first time Ive chenged them.

Wade, I bet one of those could be your culprit. Fuel filter and plugs are the first place I would start. The fuel filters are reccomended to be changed more often on our trucks. Motorcraft FG986, I think. .040 is far too wide with a 6lb lower. Blowout usually happens at the higher RPM range and it's more noticable in a longer gear with the heavier load. The higher the boost, the tighter the gap needs to be. I think JDM told the built motor guys to gap them @ .030.

[wade w]

Changing the plugs was a pain in the *$#! But I guess ya got to do what ya got to do. thanks for the help.

[chrisheltra]

yes it does have a hand held. it's a sct. Ill see if I can do what youre taking about. do you have to keep it pluged in while you drive it. I havent
changed the fuel filter. i gaped the plugs 40. but the old plugs were a lot
more. Ive only had the truck 7months. witch is why I havent changed the
filter. To be honest I havent thought about it. I wasnt sure how much to gap the pugs. the factory thing said 42-46. so I figured 40 was good. it is the first time Ive chenged them.

Wade, I bet one of those could be your culprit. Fuel filter and plugs are the first place I would start. The fuel filters are reccomended to be changed more often on our trucks. Motorcraft FG986, I think. .040 is far too wide with a 6lb lower. Blowout usually happens at the higher RPM range and it's more noticable in a longer gear with the heavier load. The higher the boost, the tighter the gap needs to be. I think JDM told the built motor guys to gap them @ .030.

Thats very good advice you should definatley start there, but I would also check into a MAF extender of some sort for the cooler months just for insurance. You can never be to safe.

[Whaler]

A MAF extender will require a different tune. If someone plugs their Predator into your truck and you take it for a drive, they can check your MAF count to see if you are maxing it out. You still don't want to be running it hard in an upper gear in COLD weather, especially with a 6lb lower.

[wade w]

Im going to do something about the maf for sure. Ive allready called jdm. I just wish they would have said something about it when I got the other stuff.

[Whaler]

Also, what plugs are you using?

[wade w]

I used the plugs jdm said to use. NGK TR6

[Whaler]

I used the plugs jdm said to use. NGK TR6

:bigthumb:

[chrisheltra]

I used the plugs jdm said to use. NGK TR6

Thats what you want now gap them to .035-.036 and get the filter changes.

[wade w]

I talked to someone at JDM and they said the stock maf would be fine. Not sure what to think about that.

[Richard Head]

Wade they (JDM) are probably right, but for a little time and effort to data log and check it is really nothing compared to a new motor. We usually meet on Thusrsday for a BS session, if you can make it someone will be available to help.

[chrisheltra]

I talked to someone at JDM and they said the stock maf would be fine. Not sure what to think about that.

To be honest with you this isnt the first time Ive heard of JDM saying this. No Im not bashing.

[DolSVT00]

Proof is in the puddin, the stock maf on a stock tune peggs at 5v(1000) it has a lil more with a custom tune but not much.
This is at WOT on a stock blower and a 5# lower, yes a five pound not a six.
http://mywebpages.comcast.net/rsmith1/data.JPG
MafV is the PID of concern.

[DolSVT00]

I talked to someone at JDM and they said the stock maf would be fine. Not sure what to think about that.

To be honest with you this isnt the first time Ive heard of JDM saying this. No Im not bashing.

And to be honest, Rick told me the same thing. But its MY shit so I believe what MY shit says.

[wade w]

Wade they (JDM) are probably right, but for a little time and effort to data log and check it is really nothing compared to a new motor. We usually meet on Thusrsday for a BS session, if you can make it someone will be available to help. I work on thursdays and my hours are 2 to 10. kind of makes it hard to do anything. I am thankfull for you guys trying to help. I dont want to hurt my motor and Ill do what i need to so that doesnt happen.They did say something about there tune does something to compensate for cold air.

[chrisheltra]

Wade they (JDM) are probably right, but for a little time and effort to data log and check it is really nothing compared to a new motor. We usually meet on Thusrsday for a BS session, if you can make it someone will be available to help. I work on thursdays and my hours are 2 to 10. kind of makes it hard to do anything. I am thankfull for you guys trying to help. I dont want to hurt my motor and Ill do what i need to so that doesnt happen.They did say something about there tune does something to compensate for cold air.

If your not happy with what your tuner tell you no matter who they are you should find a new one.

The customer is always right. If you want something and they tell you NO go somewhere else. Or you could ask them in writing "if my shit blows will you give me a brand new JDM built long block to cover my losses?"

[wade w]

Im going to do what i have to. call some one else. call them back and talk to another person. what ever. while Im thinking about it. Youre truck looked real good with that new suspension set up Chris. Congrats

[Mike]

Chris,

Where did Wade say he wasn't happy with what they said? Are you trying to put words in his mouth?

[chrisheltra]

Chris,

Where did Wade say he wasn't happy with what they said? Are you trying to put words in his mouth?

:cheers

[Mike]

Chris,
:lol:

Wade,

If JDM thought that you were even close to needing a MAF, I'm sure they would be more than happy to sell you one.

Do you have access to a Laptop?

[wade w]

yea. thats what im on now.

[Mike]

Do you have the SCT Live Link software loaded on it yet?

[wade w]

I dont think so because I dont know what that is.

[Mike]

You can go to www.SCTflash.com and download it. You will also need a USB cable. You will have everything you need to see what your MAF voltage looks like.

If you have any questions, just ask, both Chris and myself have used Live Link.

[wade w]

Thanks Mike

[Lurch]

Wade are you running a JDM Tune? I think you said you were if so I would get the plugs down to .030 to.032 4177 tr6 is the stock lightning plug and I would order a 2400 SCT and jdm will set the tune. We were going to go to the 2600, 2800 or even the 3000 but Jim SR. said they bog off the line and do crazy things through the run and as he said there is a lot of tuner's going to big on the MAF As he explained to us it makes less power because you can't control it and keep it stable. Also JDM has used the 2400 and made over 900 HP at the rear wheels that is 1158HP at the motor Don't think you are going to see that yet. We only have 2400 on Daryls and Bill and the reason is not because we didn't try They would not sell it to us because it's not tuneable.NOTE IT IS TUNEABLE FOR WIDE OPEN THROTTLE RACE ONLY!! They do it daily I just asked today about the C116 tune and thats a lot of power and they said stay with the 2400 and they would do the rest. Mitch P.S. NO WARS ON THIS JUST QUOTING WHAT I WAS TOLD IN NEW JERSERY The Stock Maf flows 1023 CFM. Easy Fix 2400 and re tune and u are safe, Air flow wise. Still need like Mike said a good sorse of Imformation we can help

[Whaler]

Wade, every truck is different. Mike logged mine for me with a non-ported blower and a 6lb lower and it was not maxxing out. Randy's maxxed with a smaller pulley, so... check it and see.

[chrisheltra]

Wade,

Find out what parameters JDM wants you to datalog and next time you plan on coming up here to go to the track give me or Mike a heads up. One of us can bring our laptops and show you how to datalog.

Mike,

You dont happen to know what parameters JDM want there customer to datalog do you?

[Mike]

Mike,
You dont happen to know what parameters JDM want there customer to datalog do you?

60', E.T. & MPH is all the data they really need :lol:

Seriously though I haven't ever asked them, but right now if we want to rule out the MAF we only need RPM & MAF_V.

[chrisheltra]

Mike,
You dont happen to know what parameters JDM want there customer to datalog do you?

right now if we want to rule out the MAF we only need RPM & MAF_V.

That is true.

[chrisheltra]

I think my maf is starting to peg. I just changed my plugs at work and I streached it out on the way home. it would start to mis at the top of third. It took it a while to straigten out. After it straightened out I tryed it again and it done the same thing. the temp was 65. :? any sugestions. will it need a new tune.

After re-reading your original post it got me thinking, and someone correct me if I'm wrong please.

You said that you think that your MAF is starting to peg after you streched the trucks legs out. I would think at that high of a load if you were to peg the MAF you would be part of the vented block club. Also you said it did that directly after a plug change. That would lead me tho think that could be the culprit.

That makes me think that Larry was on the right track originally. But it still wouldnt hurt to datalog your MAF counts.

[wade w]

yea after reading all of this. I think its the plugs. I changed the filter last night but I didnt have time to get to the plugs. when I went home it done the same thing ecept it stayed. its still missing. I think it fouled one of the plugs. I still want to data log it just to see were Im at. thanks a lot everybody.

[Whaler]

Update us after you change the plugs. I think it will fix your problem.

[wade w]

Yea I think so to. Ill let you guys know.

[wade w]

well I found the problem. Its preaty bad. I had sleaves put in the spark plug holes because it blew a spark plug out not long after I first got the truck. I had them put in all of the holes because I didnt want to have any problems with it later. when I changed the plugs it pulled the top off of two of the sleaves. one in each head. I didnt think it would hurt. the threads were still there just the seat came out. I thought the plugs would just seat were the did before the the sleaves were put in.well the plugs hit the top of the piston and the sleaves came out all mangeled up with the plugs when I tryed to change them today. not sure what Im going to do. preaty upset :(

[wade w]

what factory heads are good. does anybody know were I can get some. I do not want ported heads. what all will work. are the L heads any diff than other 5.4 head

[Mike]

Sorry to hear that Wade.

PM Frank (SVENSONJR) and see if his old heads are any good.

[wade w]

sent him a mesage. Thanks for the tip Mike

[chrisheltra]

Im not sure what year Franks truck is but you want to try to get 03/04 head a they have more threads for the spark plug and they dont spit them out like the older heads do.

[Mike]

Frank's truck is an 03. From what I read some early 03 trucks still had 4 thread heads. Your Build date would have to be after ~Nov 02 to have the 8 thread heads.

More threads are better, but with good maintenance (checking plugs often) 4 thread heads will work.

[wade w]

If I end up replacing the heads I would put the inserts in them before I even put them on. I was so pissed last night. I didnt even think about there being a posability that my heads could be fixed. the insert did just screw out. they got wadded up. but it was at the top of the hole. they may not be savable but Im going to try.

[chrisheltra]

Might as well pop in some cams while you have the heads off

[wade w]

Heads are ok. I just had to replace the two inserts that broke. over reacted a little. The first bad plug I took out looked real bad. the end of it was burned off and the insert was all wraped around it. scared the crap out of me. now about that king of the stock long block thing. where are we at with that. Im going to look. :D