302 weird ignition/fuel problem.

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Dec 26, 2004 | 01:32 PM

soulsaflame4135

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302 weird ignition/fuel problem.

ok guys i have an 87 bronco with a F.I. 302. it has the mustang stule fuel injection with the throttle body off to the side.

I have been having problems wiht it, under normal acceleration it chatters and fels like it is misfiring. at first it was every once in a while and only under medium throttle but it is doing it more and more often at all rpm now.

the truck is getting between 5-7mpg if i baby it, and i think it should be getting around 10 if that helps.

it has a new cap rotor wires/plugs. a new ignition module, and a new IAC. i am getting no check engine light and no codes.

it starts every time and idles fine so i dont even knwo how i would begin to diagnose this problem. do any of you guys have any ideas?

Dec 26, 2004 | 05:02 PM

92supercab

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From: Alaska

I beleive there is a post that covers testing your Oxygen sensor. Someone said once that they may not trigger the chack engine light. My 88 Mustang was acting similar and just on a whim I decided to put in a new o2 sensor, problem solved. Any way it's a starting point. Also Try checking your ground connections.
Good luck

Dec 26, 2004 | 09:15 PM

soulsaflame4135

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i checked the grounds before already, I have to put a new starter in so i guess while i am down there i will throw an 02 sensor in. thanks

Dec 26, 2004 | 10:34 PM

soulsaflame4135

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ok i forgot to say, i dont think it is related but it has a very erratic idle. it jumps from 1000-1500 in neutral and from 900-1300 in gear. sometimes it will go as high as 2000