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Old December 11th, 2007, 04:31 PM   #1
corvair66cars
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ranger misfiring

Hey I have a 88 ranger that runs great at start up but after i go down the road like 5 miles it feels like i loose a cylinder...if i push in the clutch and hit the gas down it will sputter and backfire a lil and then clear out and i can take off again...ive changed the plugs cap and rotor and set the timing again.any ideas on where to go next...it is a 2.9 v6...any help would be appreciated.
Thanks,
John
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Old December 11th, 2007, 05:05 PM   #2
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check fuel pressure
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Old December 11th, 2007, 06:57 PM   #3
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Could be wires, look at them when its dark and see if you can find any of them glowing or shooting sparks.
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Old December 11th, 2007, 07:59 PM   #4
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Could be wires, look at them when its dark and see if you can find any of them glowing or shooting sparks.
mist the wires in the dark - it'll make the arcing more visible.
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Old December 11th, 2007, 08:30 PM   #5
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My dad taught me to pull the wires off one at a time with it running to see if it makes a difference, that helps pinpoint the prob. You just gotta be carefull!!! Taking them off is pretty easy but I shut it off to put it back on.
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Old December 11th, 2007, 10:10 PM   #6
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It loses more and more power the further the trip and just pops or backfires out of the intake...It barely lets me go above 2000rpms...
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Old December 11th, 2007, 11:14 PM   #7
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It loses more and more power the further the trip and just pops or backfires out of the intake...It barely lets me go above 2000rpms...
1) check the fuel pressure.....could have low pressure/volume

2) Check the manifold vacuum - it should be around 17" and I'll bet that it'll drop steadily as the engine runs for a longer length of time.....this would indicate a restricted exhaust (read: Plugged cat).

I'm betting if the cat's aren't gone already, they're starting to become restricted...atleast thats what it sounds like when you say that it gets worse the longer the trip is
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Old December 11th, 2007, 11:18 PM   #8
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change the fuel filter...that got me like that one time.
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Old December 12th, 2007, 03:17 PM   #9
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I put a new fuel filter, fuel pump, coil, cap, rotor, pulled each plug off individually and got a difference, dont have vaccum gauge to check cats but is my guess at maybe the next thing to try.
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Old December 12th, 2007, 05:16 PM   #10
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I put a new fuel filter, fuel pump, coil, cap, rotor, pulled each plug off individually and got a difference, dont have vaccum gauge to check cats but is my guess at maybe the next thing to try.
If the bolts at the Y-pipe arent siezed/rusted (or any connection on the exhaust in front of the cat(s) you can always just loosen them and test drive it....sure, it'll be loud as shit, but it'll tell you if that was the problem without buying tools
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Old December 13th, 2007, 11:27 PM   #11
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Okay so my buddy thought it could be the 02 sensor and the connector was melted so we cut the wires 2inches above connector and fired up the truck drove it out of the garage and it blew my headlights and boiled the battery with the battery light on....wtf..just happened...regulator part of alternator or no??????
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Old December 17th, 2007, 01:21 AM   #12
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You may have tied two of the wrong wires together. A heater wire and a sensor wire which created a huge short and fried part of your system.
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Old December 17th, 2007, 02:37 AM   #13
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you now have scrap weight
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Old December 17th, 2007, 02:47 PM   #14
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I didnt put any wires together..i just cut them pretty much just disconnected them...got the truck running now and everything seems to be doing alright...I replaced the alternator which must have been the cause of the voltage spike.
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