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Old February 20th, 2006, 10:41 AM   #1
equineolove
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My 88 Ford Bronco is doing a hit and miss thing. it will shake/ jerk while you are just cruzin down the road. i think that it is a faulty fuel injector. my pal wanted to say fuel filter, but that would not be a hit hit and miss thing. it the filter was dirty and plugged, it would bog all the time, same with spark plugs which they wanted to blame it on. if a plug is bad it is bad it would not hit and miss. so do y'all think that it could be my fuel injectors. yes my bronc has them because here is the other thing...it has an 88 F150 6 cylinder manual dropped into it. any help...suggestions? i could use it before i go wripping into it. that is quite a job! or at least it was on my firebird! i also have the tool to check the Ohlm (cant spell) on the injectores. but if y'all have any more knowledge of wizdom please pass it on to me. thanks
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Old February 20th, 2006, 10:46 AM   #2
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Lean problem. So go from there
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Old February 20th, 2006, 10:47 AM   #3
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I know I know because its a FORD!!! :tonka:

just joking
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Old February 20th, 2006, 10:48 AM   #4
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Quote:
Originally Posted by Deke
Lean problem. So go from there
what is lean? I have never hear of that. I am going to be dumb


thanks Angel !!!!!!!!
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Old February 20th, 2006, 10:49 AM   #5
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Lean means its not getting enough fuel for the RPM range you're in. Could be a few issues.

I'd check the fuel filter first off
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Old February 20th, 2006, 10:49 AM   #6
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Actually, the fuel filter can have debris swirling in it causing lean-outs which would give you the hit and miss thing. If it were me, i'd replace the plugs and fuel filter as well as cleaning/servicing the injectors and oil change.
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Old February 20th, 2006, 10:54 AM   #7
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At first I thought this was going to be a post about your love-life...Post this stuff in the right forum next time..

Sounds like a misfire. Check all 6 plugs, and wires. Pay attention to when it does the herky-jerky. Cold starts? Engine bay not warmed yet? Extremely cold out? Raining? Foggy/humid? Spray water on the plug wires, see if it does it.
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Old February 20th, 2006, 11:00 AM   #8
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Quote:
Originally Posted by Haggar
At first I thought this was going to be a post about your love-life...Post this stuff in the right forum next time..

Sounds like a misfire. Check all 6 plugs, and wires. Pay attention to when it does the herky-jerky. Cold starts? Engine bay not warmed yet? Extremely cold out? Raining? Foggy/humid? Spray water on the plug wires, see if it does it.
on top of checking the plugs and fuel filter look at the vacuum lines to the items around the engine, you could have one ripped or sucked shut and it going to have grave effects on things like egr valve or the map & baro sensors(they regulate fuel delievery)
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Old February 20th, 2006, 11:05 AM   #9
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Quote:
Originally Posted by Haggar
At first I thought this was going to be a post about your love-life...Post this stuff in the right forum next time..

Sounds like a misfire. Check all 6 plugs, and wires. Pay attention to when it does the herky-jerky. Cold starts? Engine bay not warmed yet? Extremely cold out? Raining? Foggy/humid? Spray water on the plug wires, see if it does it.
it just does it when ever. i guess mostly in 2nd and up. how do i know if my wires are bad. i guess that is why i skip over it because i am not wodd with electronics at all! if it were a plug wouldn't it just be bad ?? or could it hit and miss like that ? it is like it is not getting gas >....


sorry i didn't know where to put it the message
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Old February 20th, 2006, 11:25 AM   #10
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Why not replace the plug wires then when you change the plugs. How many miles on the thing? Are they the original plugs and wires?
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Old February 20th, 2006, 11:27 AM   #11
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Quote:
Originally Posted by Lothos
Why not replace the plug wires then when you change the plugs. How many miles on the thing? Are they the original plugs and wires?
i don't know how to do wires ..... unfortunatley. I am sure that my dad does, so yeah i will have to see, well i know they guy had to have rolled back the milage when they dropped in the new ingin because it only has 49,000 i don't know if all is original
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Old February 20th, 2006, 11:35 AM   #12
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Check the fuel pump. This is the exact same thing that was happening on my friends BMW. We replaced the pump and it stopped.
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Old February 20th, 2006, 11:49 AM   #13
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Quote:
Originally Posted by equineolove
i don't know how to do wires ..... unfortunatley. I am sure that my dad does, so yeah i will have to see, well i know they guy had to have rolled back the milage when they dropped in the new ingin because it only has 49,000 i don't know if all is original

wires are easy, you just buy the set for your make/model and replace them 1 at a time with the same length new one. That way you don't get confused and screw the firing order up. They just pop on on both ends.
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Old February 20th, 2006, 05:19 PM   #14
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My blazer had a similar problem. Turned out that the EGR valve was getting gummed up with little chunks of carbon.
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Old February 20th, 2006, 07:03 PM   #15
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I wouldn't just got throwing parts at it hoping to fix it....that can get expensive.

To me, it sounds like you've got a bad set of plug wires. Typically bad wires will cause a misfire under load while at a cruising speed on the highway, etc (say you've got cruise control on and you go up a hill on the highway - the engine will start to miss.) An easy way to check this is to get a spray bottle with water in it, go out during the dark, have a buddy sit in the truck and LIGHTLY brake torque it. Spray the wires/coil/dist. cap down with the water, one at a time. If the truck begins to miss and run like crap when you spray the wires (more than likely they'll arc externally and you'll see it - which is why you do it in a dark setting) then it needs wires....if the thing runs like crap when you spray the coil, it's going to need a coil...etc, you get the idea. But that's only going to work for the secondary ignition system.

If that leads no where, I'd say pull a plug, and look at the gap. If it's huge (spec should be around .060 I *think* - should be a sticker under the hood with it on it) then you're going to need plugs.....

That'd be a decent check of the ignition system. If that doesn't yeild anything obvious, i'd say go to the fuel system. First thing to check if you were a tech would be fuel pressure as well as volume. To do this you'd need a fuel pressure guage. If they're good, then I'd start looking into bad injectors/pulse width signals. If they're bad, I'd check the filter, to make sure it wasn't plugged or restricted at all (take it off and try to blow through it, also make sure you see what comes out of it - is it dirty?) If the filter's fine, the only thing left would be the pump.

You've got to check the obvious first before you can start doing things like checking injector ohms with a volt meter....

Cliff notes: Check the wires/plugs, take the fuel filter off and try to blow through it - or just replace it cuz they're cheap and it probably needs one anyhow for preventitive maintenance.......then let us know what you find
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