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Author Topic: Help with air/fuel ratio and timing  (Read 1203 times)

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Offline SkatersTj

  • Budget Lift
  • Posts: 123
Help with air/fuel ratio and timing
« on: October 26, 2011, 01:00:26 PM »
Can anyone help me out with the air fuel ratio and the timing on my scrambler!  I'd like to take it out for the Oct 29th run and to just have it running smooth. Its a amc 304 with a howell fuel injected conversion.

Thanks James
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JamesEmergencyEvacutionPlan
1997 Tj sport 3" lift 31's
1982 Cj8 scrambler 4.5' lift 35's
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Offline frenchy

  • Talks waaay too much!
  • Posts: 1417
Re: Help with air/fuel ratio and timing
« Reply #1 on: October 26, 2011, 01:39:33 PM »
Can you elaborate a little on what the problem is exactly?

What is it doing or not doing? At what idle speed? What codes is it spitting out?

Air/fuel ratio is set by the computer, determined by input received by the sensors.
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Offline SkatersTj

  • Budget Lift
  • Posts: 123
Re: Help with air/fuel ratio and timing
« Reply #2 on: October 26, 2011, 01:57:57 PM »
Has a bit of a rough start , "sometimes" when i give it gas it will almost back fire, then die or almost die parked and driving. It idles alright sometimes but normally will have a wierd 1200-1500rmp average stuttering. Im getting alot of smoke come out on start and wierd initial idle until put into drive or reverse. When i put it into gear it drops to about 800-900rpm and runs a little smoother. I had Jef come take a look and he thought it might be  the air fuel/timing idea but im pretty sure he is tired of hearing about it ;D Its running a little better now that i have used fuel inection cleaner and stop smoke. I'm just worried about havn trouble with it on the trail.
« Last Edit: October 26, 2011, 04:04:29 PM by SkatersTj »
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JamesEmergencyEvacutionPlan
1997 Tj sport 3" lift 31's
1982 Cj8 scrambler 4.5' lift 35's
___/|¯[_\__\],
l¯¯¯l¯¯L-O|||||O_
¯()_)¯¯()_)¯¯¯()_)

Offline SkatersTj

  • Budget Lift
  • Posts: 123
Re: Help with air/fuel ratio and timing
« Reply #3 on: October 26, 2011, 02:09:26 PM »
O i almost forgot i dont have the code reader just the little red gm device
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JamesEmergencyEvacutionPlan
1997 Tj sport 3" lift 31's
1982 Cj8 scrambler 4.5' lift 35's
___/|¯[_\__\],
l¯¯¯l¯¯L-O|||||O_
¯()_)¯¯()_)¯¯¯()_)

Offline binare

  • That CB Yapper
  • Posts: 771
Re: Help with air/fuel ratio and timing
« Reply #4 on: October 26, 2011, 02:24:02 PM »
Sounds more like a vaccuum leak to me.
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Offline SkatersTj

  • Budget Lift
  • Posts: 123
Re: Help with air/fuel ratio and timing
« Reply #5 on: October 26, 2011, 02:27:05 PM »
Awsome I have zero knoledge in that field! any ideas were to start?
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JamesEmergencyEvacutionPlan
1997 Tj sport 3" lift 31's
1982 Cj8 scrambler 4.5' lift 35's
___/|¯[_\__\],
l¯¯¯l¯¯L-O|||||O_
¯()_)¯¯()_)¯¯¯()_)

Offline frenchy

  • Talks waaay too much!
  • Posts: 1417
Re: Help with air/fuel ratio and timing
« Reply #6 on: October 26, 2011, 02:28:15 PM »
Could be a lot of things, getting the codes read for free at auto value might help identify a bad sensor or something.


Tune up is good?
Any Vacuum leaks?
Try spraying some carb cleaner around the edges of the intake and Vac hoses,  if you're idle changes with the spray, it's leaking and will cause it to run like garbage.

If it has never run right maybe it has the chip programmed wrong or for another engine,
Howell has free support, Phone: (810) 765-5100
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Offline SkatersTj

  • Budget Lift
  • Posts: 123
Re: Help with air/fuel ratio and timing
« Reply #7 on: October 26, 2011, 04:59:07 PM »
I found some new oil today when I drove it around the block. When I first bought it the back right spark plug was really loose, there oil now coming from same plug. One of my gaskets is leaking aswell, I'll try out the intake cleaner tonight.

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JamesEmergencyEvacutionPlan
1997 Tj sport 3" lift 31's
1982 Cj8 scrambler 4.5' lift 35's
___/|¯[_\__\],
l¯¯¯l¯¯L-O|||||O_
¯()_)¯¯()_)¯¯¯()_)

Offline Evil-Jeep

  • UberWheeler
  • Posts: 319
Re: Help with air/fuel ratio and timing
« Reply #8 on: October 27, 2011, 09:25:35 AM »
Is the oil coming from the spark plug hole or around it? If it is coming directly from where the spark plug goes in you may have a bit of an issue on your hands.
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“I contend that we are both atheists. I just believe in one fewer god than you do. When you understand why you dismiss all the other possible gods, you will understand why I dismiss yours.”

Offline SkatersTj

  • Budget Lift
  • Posts: 123
Re: Help with air/fuel ratio and timing
« Reply #9 on: October 27, 2011, 11:15:10 AM »
Could changing the head cover gasket help, that way I can take a look inside at the plug seals aswell?
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JamesEmergencyEvacutionPlan
1997 Tj sport 3" lift 31's
1982 Cj8 scrambler 4.5' lift 35's
___/|¯[_\__\],
l¯¯¯l¯¯L-O|||||O_
¯()_)¯¯()_)¯¯¯()_)
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