bronco 2 problem

[boondockboost]

i had a recent problem with my bronco 2 its an 89 with a 2.9 5spd. once in a while when im on the gas almost just cruisin in any gear. the truck bucks and it seems when ever it does it the rpm needle drops down when it bucks. never had a problem with the truck until recent. what could it possible be? thanks

 

[HndMeDnBroncoII]

sounds like the ignition module is starting top go.they can be tested look in the tech section good luck

 

[kimcrwbr1]

Pull the codes that is in the tech library also under EEC-IV

 

[kimcrwbr1]

http://www.therangerstation.com/tech_library/OBD_I.html

 

[jhammel85]

sounds like the ignition module is starting top go.they can be tested look in the tech section good luck

I can vouch for this. My truck did this just before it went out too. I'd check for codes 1st

 

[adsm08]

Your three best suspects in order are:

The aforementioned TFI module

The O2 sensor

The Throttle position sensor.

I'd start with the TFI, and go from there. The TFI in these trucks are known for going bad because Ford put them in a really stupid spot where they are exposed to a lot of heat.

 

[boondockboost]

i scanned it with my scanner and it came up. the tfi modual and an 02 sensor. thanks for the help guys

 

[miles]

my tfI did the samething last week then died on my 89 bII

 

[Shran]

Could be any of the above or a dying fuel pump. My F150 and my Ranger have both done that before the pump died.

 

[kimcrwbr1]

Cool clean the intake air temp sensor and the idle air control while you are at it then reset the computer. You need to reset it anyway if you change the 0-2 sensor. Run the KOEO test and as the computer starts giving you codes end the test to erase the memory. Then disconnect the battery while your changing the 0-2 sensor, TFI and cleaning the IAT. Once you get it all back together run it for about 20 minutes at medium speeds to set the new values for the new sensor. Then run the codes again to confirm the repair. If you change or clean a sensor you need to reset the computer.