Motor surges,hunts for power....HELP

pappy535 · Post by **pappy535** » Sun Mar 13, 2005 8:06 am

Hi guys my 89 Bronco II has the stock 2.8L with 90,000 miles on it but it is now starting to surge or hunt for power that isnt there or in some cases is there but on and off...is this a sensor or loose wiring? i have changed the plugs but nothing else PLEASE FILL ME IN

wilber · Post by **wilber** » Sun Mar 13, 2005 10:47 am

should be the 2.9 L

ranger5.0 · Post by **ranger5.0** » Sun Mar 13, 2005 2:20 pm

Check the fuel filter to see if it is plugged

pappy535 · Post by **pappy535** » Sun Mar 13, 2005 3:25 pm

sorry it is the 2.9l ...didnt catch that before i posted my message

pappy535 · Post by **pappy535** » Sun Mar 13, 2005 6:10 pm

thr truck used to run ok when it warmed up now it does it all the time....i have in the past gone through mud holes fast and im almost sure this might have to be either electrcal or vacum problems...fuel pump is ok

Post by **Nobody** » Sun Mar 13, 2005 6:26 pm

Plug wires

DBrown · Post by **DBrown** » Sun Mar 13, 2005 7:40 pm

go to autozone and have them run the codes for you they will do it for free. that will point you in the right direction.

Exhauster · Post by **Exhauster** » Sun Mar 13, 2005 8:41 pm

it could be fuel related or it could be ignition.... i would check the fuel pressure and make sure it's not the pump or filter.... it seems pressure regulators are prone to failure also... if fuel system checks out ok, i would give it a complete tuneup including cap and rotor.... is the check engine light coming on?

B2JAY · Post by **B2JAY** » Sun Mar 13, 2005 9:27 pm

You mentioned you played in the mudd? Take your airbox apart completely and clean like new also check throttlebody and sensor. Might want to also clean them out as well. Change air filter, check plugs and wires and cap and rotor.

85ranger4x4 · Post by **85ranger4x4** » Mon Mar 14, 2005 8:55 pm

02 sensors also. I think the replacement interval is about 90,000 miles.

Trigger_2001 · Post by **Trigger_2001** » Mon Apr 04, 2005 9:51 am

does it lose power when you really press down the gas pedal? If so, It could be that your fuel pressure regulator is spraying fuel into the intake manifold. Mine did that.

DBrown · Post by **DBrown** » Tue Apr 05, 2005 8:50 am

it sounds to me like you have a bad coolent temp sensor, but like I said untill you pull codes you will have no direction as to what you are replacing.

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Motor surges,hunts for power....HELP

Motor surges,hunts for power....HELP

Airbox