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Author
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Topic: Bronco II 2.9l help
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Fastymz
Moderator Posts: 21275
From: Reno Nv USA M&M#1240
Registered: Apr 2001
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posted 10-14-2005 05:01 PM
   
My sons bronco starts good and idles good. But when you give it gas some times it does nothing at all,kinda bogs,stalls etc. Then goes like crazy. It'll do this from a cold start,while warmed up running down the road, or at any time. It just seems to not be getting gas, or not sure what?
You have to floor it when it acts just to get it to go at all.Then it goes fine.Ron ------------------
oddly obsessed with big scoops on little Mustangs 65 coupe BIG Boss hood scoop My Pics [This message has been edited by Fastymz (edited 10-14-2005).]
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MLariviere
Moderator Posts: 4120
From: Biddeford,Me.USA
Registered: May 99
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posted 10-20-2005 08:53 PM
That sounds like a possible vacuum leak.
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Hell_Fish
Gearhead Posts: 911
From: Austin, TX.
Registered: May 2002
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posted 10-25-2005 12:01 PM
Might try cleaning the TB and adjusting the throttle cable.
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Bluegrass
Journeyman Posts: 12
From: Pa/
Registered: Oct 2005
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posted 10-30-2005 11:21 PM
Own a Bronco II and a Ranger. Been here.
When was the last time a fuel filter was replaced.
Check the fuel pressure off the fuel rail, should be close to 38 psi.
These trucks have a low pressure pump in the tank and the hi-pressure pump on the frame rail under the driver. Are ther running?
Fuel pumps can be operated right from the engine test connector without the engine running.
The fuel filter is up closer to the engine.
The black canister you will see has no filter in it.
Otherwise plugs, cap/rotor, Map sensor etc are all possible causes.
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MLariviere
Moderator Posts: 4120
From: Biddeford,Me.USA
Registered: May 99
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posted 11-02-2005 10:08 PM
Did you find anything,Ron?
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Fastymz
Moderator Posts: 21275
From: Reno Nv USA M&M#1240
Registered: Apr 2001
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posted 11-03-2005 11:31 AM
No haven't had the time. It's on my list of things to do. Now I have a few things to check out once when I get the time.  ------------------
Mustangsandmore member #351w oddly obsessed with big scoops on little Mustangs BIG Boss hood scoop
My Pics "How do you feel about women's rights ? I like either side of them." Groucho Marx
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Hell_Fish
Gearhead Posts: 911
From: Austin, TX.
Registered: May 2002
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posted 11-07-2005 02:45 PM
quote:
Originally posted by Bluegrass:
These trucks have a low pressure pump in the tank and the hi-pressure pump on the frame rail under the driver.
Depends on the year. Later models only use a high pressure pump in the tank. ------------------
Dustin C
"The Mopar Guy!"
56 F-100
Mech. for wifes 69 Mustang coupe 302 with 69 351W heads and Offy 4bbl intake, C4, Granada disc brakes, Mach 1 springs, Boss 302 sway bar, 8" open
65 Plymouth Barracuda
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Fastymz
Moderator Posts: 21275
From: Reno Nv USA M&M#1240
Registered: Apr 2001
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posted 01-13-2006 12:44 AM
Ok we did plugs,cap,rotor,plugwires,and fuel filter. The fuel filter did make it run better then before. But it still will idle down about 200rpm almost die and then just bounce right and run fine. For a short time then do it all over again. It still feels like it's loosing power just at will. But the fuel filter did seem to help some.Thanks for the advice. ------------------
oddly obsessed with big scoops on little Mustangs HOOD HACKERS DELIGHT!
My Pics
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Whitson
Gearhead Posts: 110
From: Western Canada
Registered: Dec 2005
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posted 01-13-2006 10:27 AM
I had a 92 Explorer, pretty much same engine only larger. I chased a problem on it where you could floor the gas and it wouldn't gain any RPM, just idle. Other times it would run like a pig and want to die. It would do it at random, usually when you went to take off from a light in heavy traffic.  Turned out to be the fuel pressure regualtor. I drove it with a gauge attached and found that when it ran bad (like you discribe) the fuel pressure was 100 PSI + and when it would idle but not take off the fuel pressure was almost zero. And all this didn't set off either a rich or lean code.
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BLstangin
Gearhead Posts: 827
From: St. James, MN
Registered: Apr 2002
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posted 01-22-2006 03:56 AM
Ron, what you are describing sounds an aweful lot like a map sensor, but first I'd pull the vaccum line off the fuel pressure regulator and check for vaccum there, and also check to make sure there is no fuel in the hose our comming out the pressure regulator where the vaccum line goes, it there's gas there, it's bad, if not, then it's probably o.k. Does it start hard, usually a bad fuel pressure regulator will cause very hard starting also. One more thing, before replacing the map sensor you should be able to test the connector at the sensor, it should have a wire with like 5 volts with the key on, and there should also be a wire there with a good ground, then one more wire that feeds info to the computer. Also check for good vaccum to the map sensor, make sure the vaccum line from the intake to the sensor isn't cracked and leaking or collapsed giving the sensor a false reading. If you know someone else with the same truck you could swap the sensors in just a few minutes and see if it cures your problem to. Most of the rangers and broncos mounted the map sensor on the firewall on the towards the passenger side between the motor and the heater box. It should have 1 vaccum hose going to it and one 3 wire connector. Some times a fuse will blow that feeds some of the engine management sensors, that's why I suggest testing for power and ground before assuming a bad sensor. I once saw a chevy come in with a bunch of sensor codes, turns out someone was checking fuses and took the fuse out of ecm-1 and put it in the heated mirror slot, which was empty before, causing 4 sensors not to get power, and making it run just terrible.------------------
1970 coupe restored with the help of my dad. currently engineless, soon to be 418w stroker, lakewood bellhousing, 4-speed toploader, and 3.50 9" locker rear.
1986 f-150, 5.0, factory towing package with original c-6 trans
http://www.supermotors.org/registry/vehicles/detail.php?id=7794
[This message has been edited by BLstangin (edited 01-22-2006).]
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