another '87 Bronco II idle problem
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another '87 Bronco II idle problem
1987 Bronco II 2.9 w/fuel injection.
Had a severe rainstorm about 7 days ago on the way home from work. Just about a 2 miles from the house the old girl starts spitting and bucking. Have to milk the gas pedal to keep her from stalling.
Since then, when you start the truck cold it will run fine for about 45 seconds at a high idle and then start spitting and sputtering. If you leave her to her own devices she stalls. If you milk the gas for about 3-4 minutes she gets over it and runs just fine. If you let her cool down for a few hours you get to repeat the whole process again.
I've checked for vacuum leaks, water in the air cleaner, the fuel pumps both are making noise, there doesn't seem to be any moisture present anywhere that would repeat itself after having ran the vehicle for some time and shutting her down.... I've stopped short of blindly replacing MAP, EGR, EEC, or anything else that I can't really test properly. Any suggestions before I have to put out money I don't really have to get her looked at?
Thanks Folks
Had a severe rainstorm about 7 days ago on the way home from work. Just about a 2 miles from the house the old girl starts spitting and bucking. Have to milk the gas pedal to keep her from stalling.
Since then, when you start the truck cold it will run fine for about 45 seconds at a high idle and then start spitting and sputtering. If you leave her to her own devices she stalls. If you milk the gas for about 3-4 minutes she gets over it and runs just fine. If you let her cool down for a few hours you get to repeat the whole process again.
I've checked for vacuum leaks, water in the air cleaner, the fuel pumps both are making noise, there doesn't seem to be any moisture present anywhere that would repeat itself after having ran the vehicle for some time and shutting her down.... I've stopped short of blindly replacing MAP, EGR, EEC, or anything else that I can't really test properly. Any suggestions before I have to put out money I don't really have to get her looked at?
Thanks Folks
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another '87 Bronco II idle problem
A new fuel filter is cheap...certainly worth a try. If it got any moisture in it, the flow through it is erratic.
Also, get the fuel rail pressure measured. Mine was way low (around 8 psi) and when it was replaced, the randome hesitation problem I had at highway speeds disappeared.
'90 Bronco II XLT
'99 Firehawk #521
Also, get the fuel rail pressure measured. Mine was way low (around 8 psi) and when it was replaced, the randome hesitation problem I had at highway speeds disappeared.
'90 Bronco II XLT
'99 Firehawk #521
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another '87 Bronco II idle problem
I have an '86 B2, and I've had problems with mine just lately. I start mine up, and when I back out of our driveway and push the gas pedal, it acts like it doesn't want to go. When I get to the stop sign down the road and decide to stop, the truck acts like it wants to completely stop and shut down, but once I get going down the road, it stops. It's different, though. Mine only does this early in the morning. Go figure!! I think mine is just used to sleeping in. Ha ha!! Anyway, good luck with your truck! Angel
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another '87 Bronco II idle problem
I'm going to try something out of the ordinary tonight. I noticed a slight burning/plastic odor tonight when I got home. I'm wondering if I'm having a bearing failing on my power steering pump.... If the truck is at high idle at cold-start time it could still spin the pump fine, but when high idle kicks down and the truck isn't up to operating temp. the pump may be bogging down and possibly causing the symptom I'm seeing... Once warmed up the problem magically fades away... I'll let you know...
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another '87 Bronco II idle problem
Update: Thought that power steering pump idea through before I did it, figured the belt would slip before the engine would start stalling so tossed that plan out.
So, I tore into that ever so easy to get to distributor first. My logic told me that if it's the cheapest repair option and the hardest to get to the it's probably broke.
First thing I found was that the #3 terminal post on the cap was extremely corroded. That's odd. Pulled out #3 spark plug and it's connector was the same. No carbon arcing, cracks or internal corrosion were present.
Replaced Cap, Rotor, Plug, and Wireset (since the coil wire had suffered some insulation rub-through) and fired her back up. It started and went to idle purr-fectly. Of course the real test will be Monday morning when I need the truck to run to get to work.
So, I tore into that ever so easy to get to distributor first. My logic told me that if it's the cheapest repair option and the hardest to get to the it's probably broke.
First thing I found was that the #3 terminal post on the cap was extremely corroded. That's odd. Pulled out #3 spark plug and it's connector was the same. No carbon arcing, cracks or internal corrosion were present.
Replaced Cap, Rotor, Plug, and Wireset (since the coil wire had suffered some insulation rub-through) and fired her back up. It started and went to idle purr-fectly. Of course the real test will be Monday morning when I need the truck to run to get to work.
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From: NY
another '87 Bronco II idle problem
Hey, not to get off topic. But what is the easiest way to get to the distributor? I have an 89 B2 XLT. I need to do it soon, but, just wondering if you have to pull the intake off or not.
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