MAF problems

wade w · 09-17-2007, 05:11 AM

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 · 09-17-2007, 09:05 AM

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 · 09-17-2007, 09:19 AM

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 · 09-17-2007, 11:21 AM

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

chrisheltra · 09-17-2007, 11:28 AM

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 · 09-17-2007, 11:30 AM

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 · 09-17-2007, 12:02 PM

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 · 09-17-2007, 12:05 PM

Quote:

Originally Posted by 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.

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 · 09-17-2007, 12:08 PM

Quote:

Originally Posted by 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.

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 · 09-17-2007, 12:10 PM

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 · 09-17-2007, 12:11 PM

Quote:

Originally Posted by Whaler

Quote:

Originally Posted by 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.

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 · 09-17-2007, 12:15 PM

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 · 09-17-2007, 12:21 PM

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 · 09-17-2007, 12:23 PM

Also, what plugs are you using?

wade w · 09-17-2007, 12:26 PM

I used the plugs jdm said to use. NGK TR6

Whaler · 09-17-2007, 12:28 PM

Quote:

Originally Posted by wade w

I used the plugs jdm said to use. NGK TR6

chrisheltra · 09-17-2007, 12:29 PM

Quote:

Originally Posted by wade w

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 · 09-17-2007, 12:47 PM

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

Richard Head · 09-17-2007, 10:39 PM

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 · 09-17-2007, 10:57 PM

Quote:

Originally Posted by wade w

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.

09-17-2007, 05:11 AM	#1
wade w Senior Member Join Date: Aug 2007 Location: Savannah GA Posts: 1,725	MAF problems 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.

09-17-2007, 09:05 AM	#2
Slowleen Senior Member Join Date: Mar 2007 Location: Summerville, SC Posts: 440	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 __________________ Tim 1994 Mustang GT w/ 5spd 2011 Ford F150

09-17-2007, 09:19 AM	#3
chrisheltra Neo is Jesus Join Date: Jan 2007 Posts: 13,265	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. __________________ Gap A Hoe Racing

09-17-2007, 11:28 AM	#5
chrisheltra Neo is Jesus Join Date: Jan 2007 Posts: 13,265	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. __________________ Gap A Hoe Racing

09-17-2007, 11:21 AM	#4
wade w Senior Member Join Date: Aug 2007 Location: Savannah GA Posts: 1,725	Thanks for the input. So does that sound like what it was doing.

09-17-2007, 11:30 AM	#6
Whaler Moderator Join Date: Dec 2006 Location: West Ashley Posts: 2,498	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 .

09-17-2007, 12:02 PM	#7
wade w Senior Member Join Date: Aug 2007 Location: Savannah GA Posts: 1,725	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.

09-17-2007, 12:10 PM	#10
wade w Senior Member Join Date: Aug 2007 Location: Savannah GA Posts: 1,725	Changing the plugs was a pain in the *$#! But I guess ya got to do what ya got to do. thanks for the help.

09-17-2007, 12:15 PM	#12
Whaler Moderator Join Date: Dec 2006 Location: West Ashley Posts: 2,498	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.

09-17-2007, 12:21 PM	#13
wade w Senior Member Join Date: Aug 2007 Location: Savannah GA Posts: 1,725	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.

09-17-2007, 12:23 PM	#14
Whaler Moderator Join Date: Dec 2006 Location: West Ashley Posts: 2,498	Also, what plugs are you using?

09-17-2007, 12:26 PM	#15
wade w Senior Member Join Date: Aug 2007 Location: Savannah GA Posts: 1,725	I used the plugs jdm said to use. NGK TR6

09-17-2007, 12:47 PM	#18
wade w Senior Member Join Date: Aug 2007 Location: Savannah GA Posts: 1,725	I talked to someone at JDM and they said the stock maf would be fine. Not sure what to think about that.

09-17-2007, 10:39 PM	#19
Richard Head Supporting Member Join Date: Mar 2007 Posts: 788	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.