87 ford ranger running ruff
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87 ford ranger running ruff
Hello everyone,
I have a 87 ford ranger pickup, it is running extremely ruff. You can smell the exaust and it smells super rich and is even spitting fuel out of he exhaust. when I bought the truck the wires were cut on he oxygen sensor, so I put a new oxygen sensor in it hoping that it would help to lean out the fuel. The truck has duel tanks on it, but the back one is off and it is draining fuel out of the line when it is running. I don't know if the cadalltic converters are plugged too, the truck only has 65,000 miles in it. or maybe its a vacuum line leak?
Any help would be greatly appreciated
Cory
I have a 87 ford ranger pickup, it is running extremely ruff. You can smell the exaust and it smells super rich and is even spitting fuel out of he exhaust. when I bought the truck the wires were cut on he oxygen sensor, so I put a new oxygen sensor in it hoping that it would help to lean out the fuel. The truck has duel tanks on it, but the back one is off and it is draining fuel out of the line when it is running. I don't know if the cadalltic converters are plugged too, the truck only has 65,000 miles in it. or maybe its a vacuum line leak?
Any help would be greatly appreciated
Cory
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Joined: Jan 2002
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From: suburban atlanta
I would check the fuel pressure regulator. It has a vacuum line that moves an internal diaphragm, and a perforated diaphragm would allow excessive fuel. The MAP sensor can also mess up the way the engine runs, but had more notable effect at idle.
If you pull the vacuum line from the regulator, and have fuel spill out, you need to replace the regulator.
tom
If you pull the vacuum line from the regulator, and have fuel spill out, you need to replace the regulator.
tom
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ok ill pull that line off as soon as I get home, if its not dumping fuel out of it, and the map sensor is ok, what else could it be? if the map sensor is messing up will it flash a code?
Thanks for the help,
Cory
Thanks for the help,
Cory
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Joined: Jan 2004
Posts: 13,851
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From: SW Va
Welcome to FTE.
^+1 on putting the fuel pressure regulator high up on your suspect list. As tomw said, if the regulator diaphragm is bad, intake vacuum will suck fuel right into the intake manifold, corrupting fuel trim.
Dirty fuel injectors with a runny nose will also corrupt the air/fuel ratio.
Seeing as how its so rich that raw fuel is coming out the exhaust, I agree the cat converter could have melted down inside & be causing high back pressure & you can check that with your vacuum gauge, scrolling down & following scenario 14 here. How to Use and Interpret a Vacuum Gauge
Also, with the fuel trim so rich, crankcase lube fuel dilution belongs on your suspect list, so you'll likely want to change the oil & filter as soon as the over fueling is fixed. I'd not drive it, or rev the engine if the dipstick reeks of fuel.
This model has 2 fuel pumps, a low pressure supply & a high pressure feeding the fuel rail & injectors, so a fuel pressure & bleed down test is in order too, to help determine if any fuel injector has a runny nose, or over pressure condition.
More thoughts for consideration, let us know how your trouble shoot goes.
^+1 on putting the fuel pressure regulator high up on your suspect list. As tomw said, if the regulator diaphragm is bad, intake vacuum will suck fuel right into the intake manifold, corrupting fuel trim.
Dirty fuel injectors with a runny nose will also corrupt the air/fuel ratio.
Seeing as how its so rich that raw fuel is coming out the exhaust, I agree the cat converter could have melted down inside & be causing high back pressure & you can check that with your vacuum gauge, scrolling down & following scenario 14 here. How to Use and Interpret a Vacuum Gauge
Also, with the fuel trim so rich, crankcase lube fuel dilution belongs on your suspect list, so you'll likely want to change the oil & filter as soon as the over fueling is fixed. I'd not drive it, or rev the engine if the dipstick reeks of fuel.
This model has 2 fuel pumps, a low pressure supply & a high pressure feeding the fuel rail & injectors, so a fuel pressure & bleed down test is in order too, to help determine if any fuel injector has a runny nose, or over pressure condition.
More thoughts for consideration, let us know how your trouble shoot goes.
Postmaster
Joined: Oct 2003
Posts: 4,516
Likes: 1
From: SoCal
Lots of good info from tomw & pawpaw. FYI your 87 is not equipped with a CEL/check engine light. The only way to know if there are trouble codes is to check.
Edit, yes you will get a code 22 if the MAP sensor is whacked.
Edit, yes you will get a code 22 if the MAP sensor is whacked.
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