CODE 42 TROUBLESHOOTING(fuel mixture too rich)

bryce · April 22nd, 2007, 01:36 PM

i am getting a rich fuel mixture and i need help trying to fix it. i would just like to add that it started this after i washed the engine, and has doing it for over two weeks. any suggestions i changed the cap and rotor which seemed to help but only temporarily.

HMUSN · April 22nd, 2007, 01:38 PM

is this a 93 GT or Cobra ?

(might want to let ppl know what a code 42 is :wink )

bryce · April 22nd, 2007, 01:40 PM

sorry it is a 88 mustang gt, aod, speed density

HMUSN · April 22nd, 2007, 01:41 PM

see i thought it was a 93..

i hate speed den cars..

does it have any aftermarket parts? like fuel injectors/pump

bryce · April 22nd, 2007, 01:43 PM

no stock

bryce · April 22nd, 2007, 01:45 PM

vacuum test came up ok, and fuel pressure came up ok to, but didnt do the residual fuel test with the key off though

HMUSN · April 22nd, 2007, 01:52 PM

take a look at your plugs..

some water might have seeped in

bryce · April 22nd, 2007, 01:56 PM

i pulled every plug out and they all looked good , every plug looked the same as far as wear is concerned as well

HMUSN · April 22nd, 2007, 02:01 PM

well if your plugs were good you aren't running rich man.

i honestly think you have water somewhere that you shouldn't.

bryce · April 22nd, 2007, 02:05 PM

it is definetely running rich because it will stall and the engine will shake a bit, just trying to figure out where the water could be and after two weeks of nice weather and driving it everyday u think the water would be gone?

HMUSN · April 22nd, 2007, 02:07 PM

one would think so damn..

sounds dumb but pop the hood and take a blow drier to it for a while??

bryce · April 22nd, 2007, 02:08 PM

a blow dryer u gotta be kiddin me. i have been driving it every day the engine fan shoud act like a blow dryer

HMUSN · April 22nd, 2007, 02:12 PM

i told you it sounded stupid

a blow drier would work WAY better than you fan.

you could also try blowing some compressed air around to see if and water shows up...

bryce · April 22nd, 2007, 02:19 PM

at this point im willing to try anything, it has gotten better over the last 2 weeks but just cant shake it. might just play the waiting game. i can only narrow the possibiliteis fuel air and spark, its not air, and its getting fuel and if it was getting too much fuel, the plugs would show, which just leaves spark, but what other components to the ignition system would get water in them? this is a intermittent problem which is why it doesnt show up on the plugs

stang fanatic · April 22nd, 2007, 08:16 PM

sounds like one of 3 possibles....map sensor got water in it and now is acting up, problem with intake air temp sensor (front of intake on runner port-d/s), or water temp senor. Either of the 2 could be reading cold which will cause a rich condition.

86blkmustang · April 22nd, 2007, 08:54 PM

Its probably a sensor. Egr valve sensor, O2 sensors Map sensor. I would check all ur sensors out and see.

HMUSN · April 22nd, 2007, 08:56 PM

finally... fox guys to help...

i was wondering when you guys would show up.

ChrisJ · April 22nd, 2007, 09:01 PM

Sounds like your MAP Sensor got water in it...That is what my money would be on...

fastford3388 · April 22nd, 2007, 09:25 PM

O2 sensors?

ChrisJ · April 22nd, 2007, 09:35 PM

Do you know anyone that might have a MAP Sensor that you know is good that you can put on your car to see if that fixes?

if it does just go out and get yourself a new MAP Sensor...

April 22nd, 2007, 01:36 PM	#1
bryce Newbie Join Date: Apr 2007 Posts: 8 iTrader: 0 reviews	CODE 42 TROUBLESHOOTING(fuel mixture too rich) i am getting a rich fuel mixture and i need help trying to fix it. i would just like to add that it started this after i washed the engine, and has doing it for over two weeks. any suggestions i changed the cap and rotor which seemed to help but only temporarily.

April 22nd, 2007, 01:38 PM	#2
HMUSN Doc 1986 SVO 48.47@ 12.58 Join Date: Nov 2006 Posts: 37,050 iTrader: 11 reviews	is this a 93 GT or Cobra ? (might want to let ppl know what a code 42 is :wink ) __________________

April 22nd, 2007, 01:41 PM	#4
HMUSN Doc 1986 SVO 48.47@ 12.58 Join Date: Nov 2006 Posts: 37,050 iTrader: 11 reviews	see i thought it was a 93.. i hate speed den cars.. does it have any aftermarket parts? like fuel injectors/pump __________________

April 22nd, 2007, 01:52 PM	#7
HMUSN Doc 1986 SVO 48.47@ 12.58 Join Date: Nov 2006 Posts: 37,050 iTrader: 11 reviews	take a look at your plugs.. some water might have seeped in __________________

April 22nd, 2007, 02:01 PM	#9
HMUSN Doc 1986 SVO 48.47@ 12.58 Join Date: Nov 2006 Posts: 37,050 iTrader: 11 reviews	well if your plugs were good you aren't running rich man. i honestly think you have water somewhere that you shouldn't. __________________

April 22nd, 2007, 01:40 PM	#3
bryce Newbie Join Date: Apr 2007 Posts: 8 iTrader: 0 reviews	sorry it is a 88 mustang gt, aod, speed density

April 22nd, 2007, 01:43 PM	#5
bryce Newbie Join Date: Apr 2007 Posts: 8 iTrader: 0 reviews	no stock

April 22nd, 2007, 01:45 PM	#6
bryce Newbie Join Date: Apr 2007 Posts: 8 iTrader: 0 reviews	vacuum test came up ok, and fuel pressure came up ok to, but didnt do the residual fuel test with the key off though

April 22nd, 2007, 01:56 PM	#8
bryce Newbie Join Date: Apr 2007 Posts: 8 iTrader: 0 reviews	i pulled every plug out and they all looked good , every plug looked the same as far as wear is concerned as well

April 22nd, 2007, 02:05 PM	#10
bryce Newbie Join Date: Apr 2007 Posts: 8 iTrader: 0 reviews	it is definetely running rich because it will stall and the engine will shake a bit, just trying to figure out where the water could be and after two weeks of nice weather and driving it everyday u think the water would be gone?

April 22nd, 2007, 02:07 PM	#11
HMUSN Doc 1986 SVO 48.47@ 12.58 Join Date: Nov 2006 Posts: 37,050 iTrader: 11 reviews	one would think so damn.. sounds dumb but pop the hood and take a blow drier to it for a while?? __________________

April 22nd, 2007, 02:08 PM	#12
bryce Newbie Join Date: Apr 2007 Posts: 8 iTrader: 0 reviews	a blow dryer u gotta be kiddin me. i have been driving it every day the engine fan shoud act like a blow dryer

April 22nd, 2007, 02:12 PM	#13
HMUSN Doc 1986 SVO 48.47@ 12.58 Join Date: Nov 2006 Posts: 37,050 iTrader: 11 reviews	i told you it sounded stupid a blow drier would work WAY better than you fan. you could also try blowing some compressed air around to see if and water shows up... __________________

April 22nd, 2007, 02:19 PM	#14
bryce Newbie Join Date: Apr 2007 Posts: 8 iTrader: 0 reviews	at this point im willing to try anything, it has gotten better over the last 2 weeks but just cant shake it. might just play the waiting game. i can only narrow the possibiliteis fuel air and spark, its not air, and its getting fuel and if it was getting too much fuel, the plugs would show, which just leaves spark, but what other components to the ignition system would get water in them? this is a intermittent problem which is why it doesnt show up on the plugs

April 22nd, 2007, 08:16 PM	#15
stang fanatic Enthusiast Join Date: May 2006 Location: El Paso, Tx Posts: 861 iTrader: 0 reviews	sounds like one of 3 possibles....map sensor got water in it and now is acting up, problem with intake air temp sensor (front of intake on runner port-d/s), or water temp senor. Either of the 2 could be reading cold which will cause a rich condition. __________________ "The gods too are fond of a joke." "If I had only known, I would have been a locksmith. "

April 22nd, 2007, 09:01 PM	#18
ChrisJ RLY SRS Join Date: Aug 2005 Location: Ft. Meade, MD Posts: 38,220 Blog Entries: 4 iTrader: 10 reviews	Sounds like your MAP Sensor got water in it...That is what my money would be on... __________________ 2008 Acura TL Type-S - 2008 EB Ford Expedition - 2002 Boosted GT - Sold Facebook Google+

April 22nd, 2007, 09:25 PM	#19
fastford3388 Regular 1991 Mustang GT Join Date: Feb 2007 Location: Lisle, IL Posts: 367 iTrader: 0 reviews	O2 sensors? __________________ - '90 Mustang LX-Sold "Debbie" - '89 Mustang GT- Deceased "Lucy" - '91 Mustang GT-70,000 mi "The Unicorn"

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April 22nd, 2007, 08:54 PM	#16
86blkmustang Regular Join Date: Jan 2007 Location: Seaford, Delaware Posts: 106 iTrader: 0 reviews	Its probably a sensor. Egr valve sensor, O2 sensors Map sensor. I would check all ur sensors out and see.

April 22nd, 2007, 08:56 PM	#17
HMUSN Doc 1986 SVO 48.47@ 12.58 Join Date: Nov 2006 Posts: 37,050 iTrader: 11 reviews	finally... fox guys to help... i was wondering when you guys would show up. __________________

April 22nd, 2007, 09:35 PM	#20
ChrisJ RLY SRS Join Date: Aug 2005 Location: Ft. Meade, MD Posts: 38,220 Blog Entries: 4 iTrader: 10 reviews	Do you know anyone that might have a MAP Sensor that you know is good that you can put on your car to see if that fixes? if it does just go out and get yourself a new MAP Sensor... __________________ 2008 Acura TL Type-S - 2008 EB Ford Expedition - 2002 Boosted GT - Sold Facebook Google+

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