1993 bronco 5.8 choking on gas - Pirate4x4.Com : 4x4 and Off-Road Forum

junker · 11-09-2011, 09:59 AM

I have this bronco that loops after starting up for a minute then settles down with a rough idle.
it runs just like it had a carb with a stuck choke. you can stomp the gas pedal and smoke comes out the pipe smelling strong gas..
things I did
replaced the map sensor twice
replaced the idle air controller
and the coil and wires
and the water temp sensor and air sensor
all plugs are black carboned over evenly with a odor of gas as was the Oxygen sensor.
checked fuel regulator vacuum for gas leak.
HELP

jamesmoss · 11-09-2011, 10:13 AM

maybe fuel injectors are dirty

dieselboy740 · 11-09-2011, 10:45 AM

Throttle position sensor.

baker84 · 11-09-2011, 11:04 AM

did you check your oxygen sensors? They can get wiped out from a rich condition. You could have fixed the problem but destroyed the oxygen sensor too?

Whitetrash303 · 11-09-2011, 09:22 PM

Have you checked fuel pressure? Pinched or clogged return line will make it rich. Have you pulled codes? Did you check the FPR while the engine was running? Does it have a MAF sensor? (rare, I know)

4xFord26 · 11-11-2011, 08:39 AM

the same thing happened to me and it ended up being a vaccumm line that melted

Dr.Danger · 11-11-2011, 04:43 PM

Quote:

Originally Posted by Whitetrash303

Have you checked fuel pressure? Pinched or clogged return line will make it rich. Have you pulled codes? Did you check the FPR while the engine was running? Does it have a MAF sensor? (rare, I know)

Did you try to diagnose anything before throwing parts at this thing blindly? Pulling codes should have been the first thing you did. Honestly man, why would you replace ANOTHER mass air sensor after replacing one already, and it not fixing it?

You might be better off paying someone to figure this out for you seeing as you like throwing money around.

RacinNdrummin · 11-11-2011, 05:03 PM

Quote:

Originally Posted by Whitetrash303

Have you checked fuel pressure? Pinched or clogged return line will make it rich. Have you pulled codes? Did you check the FPR while the engine was running? Does it have a MAF sensor? (rare, I know)

This.

Sounds like a blown FPR to me, you sure there is no gas in the vacuum line?

kemicalburns · 11-14-2011, 12:58 PM

gotta check fuel pressure both with key on and with engine running. i bet the fuel pressure is really high. check your oil, if you smell gas do not drive or turn it over until you do an oil change. if gas gets on the crank,rod bearings they will wash and get ruined causing motor failure.

11-09-2011, 09:59 AM	#1 (permalink)
junker Registered User Join Date: Dec 2006 Member # 84271 Posts: 16	1993 bronco 5.8 choking on gas ! HELP ! I have this bronco that loops after starting up for a minute then settles down with a rough idle. it runs just like it had a carb with a stuck choke. you can stomp the gas pedal and smoke comes out the pipe smelling strong gas.. things I did replaced the map sensor twice replaced the idle air controller and the coil and wires and the water temp sensor and air sensor all plugs are black carboned over evenly with a odor of gas as was the Oxygen sensor. checked fuel regulator vacuum for gas leak. HELP Last edited by junker; 11-09-2011 at 10:04 AM.

11-09-2011, 10:45 AM	#3 (permalink)
dieselboy740 Rock God Join Date: Sep 2010 Member # 168108 Location: Ramona Posts: 1,240	Throttle position sensor. __________________ 97' f-250, 7.3psd, extracab, 30" out of frame, dana 60 e-locked, 10.25", rear disc conv, 14'' profender shocks, 37s dbl beadlocks, intake, 3" dp to 5", dpf5 tuner, 12k winch '90 f-250 project, boat sides, 3/4 link, cage etc '91 Volvo 940se holset turbo, olive drab, lifted rally car

11-09-2011, 11:04 AM	#4 (permalink)
baker84 Registered User Join Date: Nov 2006 Member # 82896 Location: sacramento Posts: 244	did you check your oxygen sensors? They can get wiped out from a rich condition. You could have fixed the problem but destroyed the oxygen sensor too? Last edited by baker84; 11-09-2011 at 11:09 AM.

11-09-2011, 09:22 PM	#5 (permalink)
Whitetrash303 Hardcore Web Wheeler Join Date: Nov 2007 Member # 102426 Location: Denver Posts: 989	Have you checked fuel pressure? Pinched or clogged return line will make it rich. Have you pulled codes? Did you check the FPR while the engine was running? Does it have a MAF sensor? (rare, I know) __________________ The Answer to 1984 is 1776

11-14-2011, 12:58 PM	#9 (permalink)
kemicalburns Registered User Join Date: Nov 2005 Member # 61938 Location: Oregon City, Or Posts: 109	gotta check fuel pressure both with key on and with engine running. i bet the fuel pressure is really high. check your oil, if you smell gas do not drive or turn it over until you do an oil change. if gas gets on the crank,rod bearings they will wash and get ruined causing motor failure. __________________ 94 Bronco 5.8/E4OD 6" Stage II 35" BFG 4.88's / Front Aussie/ Warn HS9500I

11-09-2011, 10:13 AM	#2 (permalink)
jamesmoss Registered User Join Date: Jun 2011 Member # 192650 Location: san diego Posts: 5	maybe fuel injectors are dirty

11-11-2011, 08:39 AM	#6 (permalink)
4xFord26 Registered User Join Date: Mar 2011 Member # 185304 Posts: 6	the same thing happened to me and it ended up being a vaccumm line that melted

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