The Ford Barn

einstein · 06-19-2020, 10:47 AM

I have a 1990 5.0 HO EFI in my 40 ford it smells like it is running very rich ant ideas to solve this?

scicala · 06-19-2020, 03:43 PM

Maybe no manifold vacuum to the fuel pressure regulator, or leaking internally (regulator). Possible the vacuum hose was never on the regulator, or fell off from poor fit ?

Sal

cadillac512 · 06-19-2020, 05:11 PM

Also, check the MAP sensor for a leaky hose or a bad sensor. Fords rely heavily on the MAP to control mixture. You need a Hertz (cycles pr second) sensor to test it...it varies frequency rather than voltage.

A proper Flathead doesn't have this trouble....(Flathead content to meet forum rules,LOL!)

Terry

51woodie · 06-19-2020, 05:58 PM

Could be the float level is set too high.

Missing or bad oxy sensor? Can you connect a scan tool?

deuce_roadster · 06-19-2020, 06:37 PM

Maybe install a flathead!

tubman · 06-19-2020, 08:17 PM

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I don't think this is the best place to ask this question, Maybe the "Ford Truck Forum" or maybe a late Mustang forum?

solidaxle · 06-20-2020, 01:37 PM

Quote:

Originally Posted by einstein

I have a 1990 5.0 HO EFI in my 40 ford it smells like it is running very rich ant ideas to solve this?

If you own a spark plug socket? I would start there. Smellameters are not very accurate.

Mart · 06-20-2020, 03:18 PM

Some background would help. For instance, has this been running fine for years and has suddenly started misbehaving, or is it a fresh build and first start? Have you made any changes lately? that sort of info.

I had a fuel injected car once that wouldn't run from first start It turned out the lamda sensors were cross wired. The effect was that the left bank got leaner and the right bank got richer in a vicious circle.

That is why I am asking about how long it has been running.

You must understand this is not the normal fodder on this forum so you might struggle to get guidance.

Mart.

06-19-2020, 10:47 AM	#1
einstein Member Join Date: May 2011 Location: Michigan Posts: 63	Running Rich I have a 1990 5.0 HO EFI in my 40 ford it smells like it is running very rich ant ideas to solve this?

06-19-2020, 03:43 PM	#2
scicala Senior Member Join Date: Jun 2010 Location: Detroit suburb, MI Posts: 3,794	Re: Running Rich Maybe no manifold vacuum to the fuel pressure regulator, or leaking internally (regulator). Possible the vacuum hose was never on the regulator, or fell off from poor fit ? Sal

06-19-2020, 05:11 PM	#3
cadillac512 Senior Member Join Date: Apr 2019 Location: Kansas Posts: 1,172	Re: Running Rich Also, check the MAP sensor for a leaky hose or a bad sensor. Fords rely heavily on the MAP to control mixture. You need a Hertz (cycles pr second) sensor to test it...it varies frequency rather than voltage. A proper Flathead doesn't have this trouble....(Flathead content to meet forum rules,LOL!) Terry __________________ "It don't take but country smarts to solve the problem" (Smokey Yunick) '41 Merc Town Sedan / 260" 8CM engine '66 Fairlane four door / "warmed up" 302

06-19-2020, 05:58 PM	#4
51woodie Senior Member Join Date: Apr 2018 Location: Chelmsford, ON Canada Posts: 604	Re: Running Rich Could be the float level is set too high. Missing or bad oxy sensor? Can you connect a scan tool?

06-19-2020, 06:37 PM	#5
deuce_roadster Senior Member Join Date: Oct 2011 Location: Shelton, WA Posts: 3,971	Re: Running Rich Maybe install a flathead!

06-19-2020, 08:17 PM	#6
tubman Senior Member Join Date: Dec 2013 Location: Minnesota, Florida Keys Posts: 11,633	Re: Running Rich Sponsored Links (Register now to hide all advertisements) I don't think this is the best place to ask this question, Maybe the "Ford Truck Forum" or maybe a late Mustang forum?

06-20-2020, 03:18 PM	#8
Mart Senior Member Join Date: May 2010 Location: Solihull, England. Posts: 9,084	Re: Running Rich Some background would help. For instance, has this been running fine for years and has suddenly started misbehaving, or is it a fresh build and first start? Have you made any changes lately? that sort of info. I had a fuel injected car once that wouldn't run from first start It turned out the lamda sensors were cross wired. The effect was that the left bank got leaner and the right bank got richer in a vicious circle. That is why I am asking about how long it has been running. You must understand this is not the normal fodder on this forum so you might struggle to get guidance. Mart.