running rich and smells really rich at times

Desperado · 12-06-2005, 11:47 PM

on my 87 fox i have notice lately that when i get on it it is fine but when i let off the gas i can smell a strong gas smell like it is really rich? was doing it with the 19 lbs injectors so i upgraded mass air and to 24 lbs injectors. any clue? want to solve this issue quickly. was running fine up till about 3 days ago. still runs great just has the fuel smell. sometimes it does it just comming to a stop from driving. have looked and can't see any fuel leaks from the tank to the injectors. also does it cold when i rev it. gas mileage has also droped. what can i check and how to check it. need this problem solved quickly please gas is killing me. i drive 140 miles a day and only getting about 145 miles to a tank now. the 24 lbs injectors are used and did notice when i shut off engine the fuel pressure drops from 35 to 20 instantly and the moves slowly to 0. with the 19lbs it did not do this it held 30 for awhile. but the smell was still there with the 19's it just started so i replaced them thinking it was them.

car specs.

87 stock short block and cam
mass air conversion
24 lbs injectors
equal length shorties
off road h-pipe
gt40 heads
1.7 roller rockers
frnder well cold air.
70mm tb
perfessional products typhoon intake
all smog stuff is still hooked up

fp is set to 39 vaccum line off 35 with it on.

canukracer · 12-07-2005, 03:54 PM

24# Mass Air Meter? Check For Vaccum Leaks Too, Spray Carb Clean Around Intake, Mine Was Doing This Too, Change To 24lbs Injectors,c&l 24# Tube4 Onths Later Intake Gaskets Got Sucked In At Heads/

Hozer 88GTConv · 12-07-2005, 04:54 PM

You didn't mention if you have an adjustable or stock fuel pressure regulator, but check around there for leaks too, then it's time to consider a leaky injector. Were the injectors new when you bought them or used?
Then it's sensor check time, o2's and EGR...

Joel5.0 · 12-08-2005, 08:45 PM

You might also want to check the charcoal canister filter vacuum lines/hose, if they are broken or disconnected, the fuel fumes are noticeable. Also check the injectors to verify none is leaking as Hozer 88GTConv suggested. GL

Desperado · 12-08-2005, 10:35 PM

how do you check injectors for leaking?
the fpr is aftermarket and no leaks from it and no fuel in the line.

fiveohpatrol · 12-09-2005, 09:24 AM

Just cause the fpr isn't leaking externally doesn't mean it is functioning properly. If you still have a stock one, I'd try putting it on there and see what happens, or go get a cheap parts store one and do it.
You really have no need for an aftermarket fpr, since you have your pressure set at stock anyway.
You also don't need 24lb injectors. 19's will go a LONG way, put them back in

Desperado · 12-11-2005, 04:47 PM

found a crack in the vent tube at the charcoal canister. also my fuel rail was not all the down on one side but it was not leaking. fuel smell is gone.

thanks for all the advise

eddielugnutz · 12-15-2005, 01:27 AM

as mentioned above, 19lb injectors will support up to about 300hp, so it is overkill on a stock motor and can actually hurt performance in some cases.

12-06-2005, 11:47 PM	#1
Desperado Registered Member Join Date: Mar 1999 Location: dallas, tx United states Posts: 20	running rich and smells really rich at times on my 87 fox i have notice lately that when i get on it it is fine but when i let off the gas i can smell a strong gas smell like it is really rich? was doing it with the 19 lbs injectors so i upgraded mass air and to 24 lbs injectors. any clue? want to solve this issue quickly. was running fine up till about 3 days ago. still runs great just has the fuel smell. sometimes it does it just comming to a stop from driving. have looked and can't see any fuel leaks from the tank to the injectors. also does it cold when i rev it. gas mileage has also droped. what can i check and how to check it. need this problem solved quickly please gas is killing me. i drive 140 miles a day and only getting about 145 miles to a tank now. the 24 lbs injectors are used and did notice when i shut off engine the fuel pressure drops from 35 to 20 instantly and the moves slowly to 0. with the 19lbs it did not do this it held 30 for awhile. but the smell was still there with the 19's it just started so i replaced them thinking it was them. car specs. 87 stock short block and cam mass air conversion 24 lbs injectors equal length shorties off road h-pipe gt40 heads 1.7 roller rockers frnder well cold air. 70mm tb perfessional products typhoon intake all smog stuff is still hooked up fp is set to 39 vaccum line off 35 with it on. __________________ Desperado

12-07-2005, 03:54 PM	#2
canukracer Registered Member Join Date: Jul 2003 Location: alberta canada Posts: 108	Re: running rich and smells really rich at times 24# Mass Air Meter? Check For Vaccum Leaks Too, Spray Carb Clean Around Intake, Mine Was Doing This Too, Change To 24lbs Injectors,c&l 24# Tube4 Onths Later Intake Gaskets Got Sucked In At Heads/

12-07-2005, 04:54 PM	#3
Hozer 88GTConv Registered Member Join Date: Feb 2002 Location: Jacksonville, FL Posts: 706	Re: running rich and smells really rich at times You didn't mention if you have an adjustable or stock fuel pressure regulator, but check around there for leaks too, then it's time to consider a leaky injector. Were the injectors new when you bought them or used? Then it's sensor check time, o2's and EGR... __________________ 1988 GT Convertible 331 10:1 TW heads, GT-40 intake, MSD, TRW flattops, B Cam w/ 1.7's, MAC exhaust, 24's, 70 TB, 76 MAF, 3.73's, Pro 5.0, Koni's, Anderson PMS, Wideband 02, yatta, yatta... One week with new motor, two speeding tickets...joy

12-08-2005, 08:45 PM	#4
Joel5.0 Registered Member Join Date: Oct 2005 Location: Sabana Grande, Puerto Rico Posts: 33	Re: running rich and smells really rich at times You might also want to check the charcoal canister filter vacuum lines/hose, if they are broken or disconnected, the fuel fumes are noticeable. Also check the injectors to verify none is leaking as Hozer 88GTConv suggested. GL __________________ ACRONYMS: LUK=Let Us Know, GL=Good Luck, LMK=Let Me Know, JIC=Just In Case, BTSTDTRT=Been There Seen That Done That Repaired That and the classic... DILLIGAS=Do I Look Like I Give A S*** 1986 Mustang GT w/T-Tops NOW: 5.0L Stock SB, X303 Cam, 700 cfm DP Holley, 289 '66 Heads, 1.7 RR, Richmond Gear 4+1 Tranny, Centerforce DF, 2.73 Gears WIP: 3.90 Gears, LS Overhaul, Adj. LCA's & UCA's (Granatelli), T-Top weather striping and rear braces bodywork

12-08-2005, 10:35 PM	#5
Desperado Registered Member Join Date: Mar 1999 Location: dallas, tx United states Posts: 20	Re: running rich and smells really rich at times how do you check injectors for leaking? the fpr is aftermarket and no leaks from it and no fuel in the line. __________________ Desperado

12-09-2005, 09:24 AM	#6
fiveohpatrol I'd rather be basketweaving Join Date: Feb 2000 Location: Indianapolis Posts: 2,551	Re: running rich and smells really rich at times Just cause the fpr isn't leaking externally doesn't mean it is functioning properly. If you still have a stock one, I'd try putting it on there and see what happens, or go get a cheap parts store one and do it. You really have no need for an aftermarket fpr, since you have your pressure set at stock anyway. You also don't need 24lb injectors. 19's will go a LONG way, put them back in __________________ NMRA O/C 9516 NA pumpgas stickshift 347 10.65@125.6, 6.73@100, 1.41 60ft

12-11-2005, 04:47 PM	#7
Desperado Registered Member Join Date: Mar 1999 Location: dallas, tx United states Posts: 20	Re: running rich and smells really rich at times found a crack in the vent tube at the charcoal canister. also my fuel rail was not all the down on one side but it was not leaking. fuel smell is gone. thanks for all the advise __________________ Desperado

12-15-2005, 01:27 AM	#8
eddielugnutz Registered Member Join Date: Sep 2005 Posts: 41	Re: running rich and smells really rich at times as mentioned above, 19lb injectors will support up to about 300hp, so it is overkill on a stock motor and can actually hurt performance in some cases. __________________ 88 Lx project. 96 Z28 daily driver.