'89 Bronco starting problems Help?
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'89 Bronco starting problems Help?
'89 Bronco full-size, 4.9 300, EFI.
Hey guys need some serious help here. My truck, for some time now has been a bit rough at start up. It cranks and cranks, then finally fired at 15-20 seconds. With a puff of smoke she would start then run fine. Now its worse! It will go a good minute or two of cranking, pop a time or 2, then finally fire up. Course a cloud of smoke but, runs fine once running. Almost acts as if it floods itself? changed plugs, cap, rotor, fuel filter, PVC seems to be ok. Any ideas?
Hey guys need some serious help here. My truck, for some time now has been a bit rough at start up. It cranks and cranks, then finally fired at 15-20 seconds. With a puff of smoke she would start then run fine. Now its worse! It will go a good minute or two of cranking, pop a time or 2, then finally fire up. Course a cloud of smoke but, runs fine once running. Almost acts as if it floods itself? changed plugs, cap, rotor, fuel filter, PVC seems to be ok. Any ideas?
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From: Kansas City
Sounds like its almost flooded. You aren't hitting the gas like a carb are you? How is your fuel mileage? My next guess would be fuel pressure regulator running too high pressure, would do about the same thing. Does it throw any codes? Fuel filter could aggravate a broken FPR, if it was a little dirty before, it could be getting even more pressure now.
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I will check the pressure regulator. Nope not hitting the gas at all. I am going to try and pull the codes today. Any chance a faulty O2 sensor could be makeing my mixture too rich? OH yeah my mielage sucks! always has been poor though.
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From: Kansas City
I don't like changing O2 sensors. It seems like they only go bad after another problem, like bad fuel mixture. but...
The FPR is just a vacuum controlled regulator, if the seal goes bad, it sucks extra gas into the intake, making you run rich. The computer won't know why because it's not from the injectors. There is a pretty easy check for leaking FPR. If you take off the vacuum hose and gas comes out, its dead.
That would fit. When you shut the truck down it still has vacuum and Fuel pressure for several minutes. If the FPR leaks, it would cause a flood condition the next time you start it.
The FPR is just a vacuum controlled regulator, if the seal goes bad, it sucks extra gas into the intake, making you run rich. The computer won't know why because it's not from the injectors. There is a pretty easy check for leaking FPR. If you take off the vacuum hose and gas comes out, its dead.
That would fit. When you shut the truck down it still has vacuum and Fuel pressure for several minutes. If the FPR leaks, it would cause a flood condition the next time you start it.
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Joined: Jun 2004
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From: Central NY
Egr isn't used during startup, troubelshoot that later. The PIP is used during startup, its in the distributor and many replace the whole dist instead of tearing it down to the PIP.
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From: Kansas City
It's possible. The pip sends the distr position and rpm to the computer. Seems strange the pip would only act funny at startup though. It's possible it could cause the injectors to fire too often, slim though. I can't imagine why it would not work at low rpm, but would work fine higher. Normally, they act worse at higher rpms. I had one that would almost backfire at 4000rpm.
If you just replace the sensor its closer to 35$ and 4-6 hours, or the distrb.100$ and 2hrs. You have to take apart the distrb. to replace the pickup.
You should check the fuel pressure on the schrader valve of the fuel rail first. How was the FPR. I might change that anyway. Nevermind, its 50$ The fuel pressure should be a hair low if it leaks.
If you just replace the sensor its closer to 35$ and 4-6 hours, or the distrb.100$ and 2hrs. You have to take apart the distrb. to replace the pickup.
You should check the fuel pressure on the schrader valve of the fuel rail first. How was the FPR. I might change that anyway. Nevermind, its 50$ The fuel pressure should be a hair low if it leaks.
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SHE"S A RUNNER!
Well boys, Thank you very much!! Fuel Pressure Regulator did the trick! The install was a complete pain in the ***, hard to get to. A little tweeking of the timing and she should be good to go! The indicator on the dampener isn't anywhere to be found but, trial and error will get it there. Thanks again! I appreciate your time and knowledge!!!
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