Go Back   Ford Mustang Forums > Mustang > 4.6 Mustang > 4.6L Talk

Welcome to our Mustang forums where Mustangers come together to hang out, discuss and enjoy their favorite Mustang hobby with fellow Mustang enthusiasts. We invite everyone to read, post, and enjoy our Mustang forum as well as the many other sections of our site.

You are currently viewing our forums as a guest. By joining our community you gain access to post topics, communicate with members, upload your photos and access many other special features. Registration is fast, simple and free so why wait, join our Mustang community today! If you have any problems with registration or your account login, please contact support.


Closed Thread   Post New Thread
Unread 03-07-2010   #1 (permalink)
MY 85 GT is offline GT Member

5.0L Member


Joined: Feb 2008
Posts: 2,423 Threads: 370
 MY 85 GT's Country Flag
Belleville   New Jersey
MY 85 GT is on a distinguished road
Default Check engine light on yet again! 1998 Mustang GT

I cant seem to keep this light off for anything now its pulling a P151 or maybe it was P0151 lean air fuel mixture?.....Whats causing this..I have a BBK cold air intake what is making this come on?????
__________________
DD 98 GMC suburban 04 Trailblazer,other toy 06 300 SRT8
Wifes toys, 91 Z28 350 tpi supercharged,89 Iroc-z 350 tpi.
1993 GT Convertible-SOLD
1998 GT SOLD 1990 GT sold

87 GT Vert.On3 turbo making 14 psi...PRO-M maf,Trickflow TW 170cc heads,TF street heat intake,70mm TB,stock cam,1.6 roller rockers,Snow performance stage 2 meth kit,42# injectors,340 lph fuel pump,tunning with Moates QH,AOD,lentech VB.electric OD,3000 stall.3.55's
MY 85 GT is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Sponsored Links
Advertisement
 
Unread 03-07-2010   #2 (permalink)
hotshot is offline S197 Mustang Owner

4.6L Member
S197 Member


Joined: Sep 2006
Posts: 13,062 Threads: 396
 hotshot's Country Flag  View hotshot's 102 photos
West Caldwell   New Jersey
hotshot is on a distinguished road
Send a message via AIM to hotshot
Default

do you have it tuned? i'd verify you have a proper tune.

And make sure all of your connections are solid and lack gaps. i threaw a code once when my filter fell off my CAI
__________________
2007 Mustang GT Convertible Stage 0 E-Force #402 Supercharger, Brenspeed Tune (435/400), GT500 Fuel pump, Clutch Delete Option, Roush Front Fascia, Brembos, California Dream Hood, Qwitch latch flush mount hood pins, MRT Light Bar, J&M LCA's, BMR UCA, UPR catch can, 6000k, Pypes Bombs, Pypes X-pipe, Airbrushed Flame pieces under the hood, Clear corners, GT500 shocks , FRPP P-springs (rear), BMR Adj Panhard, E-Force engine covers
2012 Ford Focus SEL 5Dr with MyFordTouch, Auto-Park, 303A Package,


hotshot is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Unread 03-07-2010   #3 (permalink)
sillyrabbit0420 is offline Top Dog

4.6L Member


Joined: Aug 2009
Posts: 3,712 Threads: 83
 sillyrabbit0420's Country Flag  View sillyrabbit0420's 4 photos
Colorado Springs   Colorado
sillyrabbit0420 is on a distinguished road
Default

In your sig, "Chip or some kind of tune" does sound a little sketchy.

Is the car running ok, or does it have any other symptoms?
Like Hotshot said, I'd start looking for vaccuum leaks and verify what "tune" you are running.
sillyrabbit0420 is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Unread 03-07-2010   #4 (permalink)
Bullitt5339 is offline Top Dog

4.6L Member


Joined: Mar 2009
Posts: 7,402 Threads: 195
 Bullitt5339's Country Flag  View Bullitt5339's 9 photos
St Pauls   North Carolina
Bullitt5339 is on a distinguished road
Default

A leak in between the MAF and the Throttle Body is the most common culprit of that code if everything else seems fine.

I'd hate to even say this, because it seems to be the 1st thing everyone says, but in this case it may help: Have you tried cleaning the MAF sensor element?
__________________
2001 Dark Highland Green Bullitt
12.25@110 naturally aspirated on a bone stock 2V longblock

Under Reconstruction for RS275 Drag Radial Class
Pushrods and Powerglide Coming Soon

If it weren't for physics and law enforcement, I'd be unstoppable.
Bullitt5339 is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Unread 03-07-2010   #5 (permalink)
4 CRUZEN is offline Rookie

4.6L Member


Joined: Mar 2010
Posts: 4 Threads: 1
 4 CRUZEN's Country Flag  View 4 CRUZEN's 1 photo
Banks of the St. Lawrence   Ontario
4 CRUZEN is on a distinguished road
Default

Quote:
Originally Posted by Bullitt5339 View Post
A leak in between the MAF and the Throttle Body is the most common culprit of that code if everything else seems fine.

I'd hate to even say this, because it seems to be the 1st thing everyone says, but in this case it may help: Have you tried cleaning the MAF sensor element?

I second that seen it happen so often and get so easily overlooked. Sometimes the most obvious are the most difficult.
4 CRUZEN is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Unread 03-07-2010   #6 (permalink)
sillyrabbit0420 is offline Top Dog

4.6L Member


Joined: Aug 2009
Posts: 3,712 Threads: 83
 sillyrabbit0420's Country Flag  View sillyrabbit0420's 4 photos
Colorado Springs   Colorado
sillyrabbit0420 is on a distinguished road
Default

Quote:
Originally Posted by Bullitt5339 View Post
A leak in between the MAF and the Throttle Body is the most common culprit of that code if everything else seems fine.

I'd hate to even say this, because it seems to be the 1st thing everyone says, but in this case it may help: Have you tried cleaning the MAF sensor element?
LOL...
I didn't want to type it...
sillyrabbit0420 is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Unread 03-07-2010   #7 (permalink)
MY 85 GT is offline GT Member

5.0L Member


Joined: Feb 2008
Posts: 2,423 Threads: 370
 MY 85 GT's Country Flag
Belleville   New Jersey
MY 85 GT is on a distinguished road
Default

I forgot to also say that i have a BBK cold air intake where the air filter is in the fender well..It was off i found it in the bottom of the fender...:p..I dont think the car was running long without it,but its possible the MAF got dirty?....That might be the best place to start...I also i have an exhaust leak on the passnger side manifold to X-pipe there is a gasket there i think its not good anymore i hear an exhaust leak by there...I really want to get a an whole new exhaust set-up from the manifolds back...
__________________
DD 98 GMC suburban 04 Trailblazer,other toy 06 300 SRT8
Wifes toys, 91 Z28 350 tpi supercharged,89 Iroc-z 350 tpi.
1993 GT Convertible-SOLD
1998 GT SOLD 1990 GT sold

87 GT Vert.On3 turbo making 14 psi...PRO-M maf,Trickflow TW 170cc heads,TF street heat intake,70mm TB,stock cam,1.6 roller rockers,Snow performance stage 2 meth kit,42# injectors,340 lph fuel pump,tunning with Moates QH,AOD,lentech VB.electric OD,3000 stall.3.55's
MY 85 GT is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Unread 03-07-2010   #8 (permalink)
Bullitt5339 is offline Top Dog

4.6L Member


Joined: Mar 2009
Posts: 7,402 Threads: 195
 Bullitt5339's Country Flag  View Bullitt5339's 9 photos
St Pauls   North Carolina
Bullitt5339 is on a distinguished road
Default

The oiled filter itself is the most common false MAF reading contributor. The oil tends to deposit itself on the MAF wires, and make them read false. I would start by cleaning the MAF, and then looking for a source of unmetered air, ie. intake leak.
__________________
2001 Dark Highland Green Bullitt
12.25@110 naturally aspirated on a bone stock 2V longblock

Under Reconstruction for RS275 Drag Radial Class
Pushrods and Powerglide Coming Soon

If it weren't for physics and law enforcement, I'd be unstoppable.
Bullitt5339 is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Unread 03-09-2010   #9 (permalink)
TigerSN95guy is offline GT Member

4.6L Member
5.0L Member


Joined: Jan 2009
Posts: 1,444 Threads: 66
 TigerSN95guy's Country Flag  View TigerSN95guy's 10 photos  View TigerSN95guy's HomePage
Westerly   Rhode Island
TigerSN95guy is on a distinguished road
Send a message via AIM to TigerSN95guy
Default

also, if all is not well check 02s too man, they can be a never ending fuel/air issue...

if ur lookin into exhaust and ur considering headers lol just ask rabbit about his adventure installing a set

good luck man
__________________
"Its not about what you can BUY, its about what you can build" anyone can buy a really cool car, but u dont ever get the satisfaction from it as you would building it yourself
1994 Mustang GT 5.0/T5 Sold
1998 Mustang GT 4.6/T45 PI-swapped mods in profile
TigerSN95guy is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Sponsored Links
Advertisement
 
Closed Thread   Post New Thread



Thread Tools



Mustang Photos
Mustang Links    Top Sites    RSS    Link To Us    Add to Favorites    Archive    Terms of Use    Site Rules    Privacy    Contact    Sponsors    Advertise   
AllFordMustangs is not affiliated with or endorsed by Ford Motor Company. ©Copyright 2002-2011 All Auto Enthusiasts Network

Search Engine Friendly URLs by vBSEO 3.5.2

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172