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Ford Truck Club Forum > FORD BRONCO | BRONCO II > 1987-1991 Ford Bronco



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  #1  
Old April 24th, 2011, 11:41 AM
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twofourmicah twofourmicah is offline
 

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Default severe vibrations

I started my truck yesterday and it was severely vibrating, as if it wasnt hitting on 2 or 3 cylinders. i changed the plugs, wires and cap and rotor. still the same. it has considerable loss of power also. any ideas anyone
  #2  
Old April 24th, 2011, 01:23 PM
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How did the plugs look? wet? dry? oily?

built and blueprinted Lightning powerplant with p&p heads, race built 4r70w by Darrin @ BC-Automotive
1-Ton swap Dyno 436/475
Transmission saga. avoid www.Engineworldusa.com, junk import motors.





  #3  
Old April 24th, 2011, 01:24 PM
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they were all dry
  #4  
Old April 24th, 2011, 01:49 PM
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Check fuel pressure at the rail, perhaps your regulator's diaphragm has given up, less likely in my mind right now but never ruled out. Otherwise I'd check for vacuum leaks.

built and blueprinted Lightning powerplant with p&p heads, race built 4r70w by Darrin @ BC-Automotive
1-Ton swap Dyno 436/475
Transmission saga. avoid www.Engineworldusa.com, junk import motors.





  #5  
Old April 24th, 2011, 02:06 PM
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thanks a lot. thats what ive been doing for the last hour
  #6  
Old April 24th, 2011, 04:44 PM
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What is the year and model of the truck?




  #7  
Old April 25th, 2011, 12:07 AM
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After your tell us the make - model - year - engine - trans - miles - any and all "recent" work done - we need all that relative stuff to help you .. your prior posts say you drive a 1991 ford bronco w/ 5.8 liter V8. Is that the 351 Windsor or the 302? What about milage, transmission, fuel injection or carb, original cat converters installed, removed, replaced / when? It could even be worn cam lobe(s) not allowing a piston to open or not open enough. Just too many possiblities without more info.

Klitch is right on the mark - but without more info about your vehicle its sorta hard to get you the right info. With fuel injected systems we need to know the type you have, such as MFI or EFI or throttle body or if you have modified to direct fuel injection via fuel injection rail(s) or if is it a nat aspirated (carb) system? For fuel injection did you unplug the fuel relays or test them? A leaking fuel pressure regulator diaphragm is a strong contender. Broken, burnt or crossed spark plug wires or bad coil packs or coil pack wiring to the ECU/M are also in the mix.

for the W351 a set of injectors is about $200 http://injectorwarehouse.com/injectors/ford/mp2009.htm

Did this just start happening all at once or was there small indicators that may not have amounted to much over a period of time that led to this?

Did you just fill up your gas?

Was the engine soaked with water or steam cleaned lately?

Can you go to autozone (most autozones or similar places will scan your vehicle for free) near you or a friend has a scan tool and do a scan?

when was the gas and trans filter changed last?

When was the last time the throttle body and sensor were cleaned?

Did you recently add any liquid engine/trans/gas additives?

Did you install any performance products, chips or packages? When? Manufacturer and model - type?

Did you or anyone else do any work in the engine compartment or on the trans or the wheels lately? if yes then re-retrace again your steps with a bright light and look for loose or broken plastic hose fittings. for the wheels - wheel sensors play a huge role in transmission shifting i.e... engine rpm problems on newer vehicles - could be a source of trouble to but not the trouble of, the trans control unit and or the engine control units.

Is there unusual amount of and color of smoke coming out of your tail pipe? (Older cars w/auto's had a vacuum modulator on the top of the trans that shifted the trans gears under vacuum.. it has a rubber diaphragm that when damaged would suck up trans fluid into the engine intake and make reddish colored smoke out the tailpipe and you would have similar problems you describe including poor or sluggish shifting.)

Too much guessing and not enuff info... not to make matters worse but the 1991 ford truck line came out the factory door with lots of NHTSA recalls including fuel related ones that went on and on.

dunno if this helps any --
http://www.fordfuelinjection.com/?p=13



What we leave behind are our words and our deeds. Nothing else really matters.






Last edited by HawaiianF150; April 25th, 2011 at 01:38 AM.
  #8  
Old April 25th, 2011, 07:39 AM
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did the distributor get
vacuum modulator, good thought Hawaii
5.8 liter = 351 cu. in.

someone needs to move this out of the introductions for more views & answers


For Those Who Fought For It...
Freedom Has A Taste The Protected Will Never Know.













Last edited by JSoko; April 25th, 2011 at 07:42 AM.
  #9  
Old April 25th, 2011, 11:28 PM
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joey i agree - it would get better views and answers



What we leave behind are our words and our deeds. Nothing else really matters.







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