View Full Version : slight miss throughout rpm range.
83 supra man
11-07-2010, 03:34 AM
so I've only had this car for 5 days so far and i've noticed that on the pacesetter header the oxygen sensor is only held on with one out of the two bolts and it is cock eyed, this leads me to believe that it is measuring cold fresh air mixed with the exhaust. could this be the cause of the miss, and the raw gas smell coming from the exhaust? or could this be a place to start looking at since its obviously supposed to be sealed and its definitely not lol. it seems like it has pretty good power but this is my first supra and its a 5 speed with 4.30 gears so idk. its feels a little slower than my 85 celica that has a lot of engine work done to it. Also its not a bad miss but you can definitely see the motor shake back and forth like it has a cam in it but it does not.
11-07-2010, 07:14 AM
While the OS needs to be corrected, it is not the cause of the miss. A miss is a stutter, caused by a weak or missing spark, and can be attributed to the ignition system. Since you just got the car, I'd suggest a complete tune up, i.e. plugs, cap, rotor, and plug wires and it should clear your problem.
11-07-2010, 01:25 PM
^^Aww I think that answers my question then. I have a very little miss as well. I can see it in my after market tach reading. It will just barely shake the needle and it is driving me crazy. Cannot even really tell by looking at the engine or even listening to it but it is there and I think it is because of this damn aftermarket 8.5mm wire.
11-07-2010, 11:32 PM
Could be bad ig wires insulation and could even be bhg. Check ig wires by looking at them in the dark with engine warm and idling. Any sparks from wires mean u need new wires.
11-07-2010, 11:46 PM
I will be checking that out tonight. Didn't even think about doing that. I know it is not a BHG, I just put that damn thing in last week and it has been doing it for a while now.
11-09-2010, 04:26 AM
also check inside your dist, cold be time for new cap and rotor. look to see if the contacts are wet, or if they look burnt. also check the cap for cracks.
83 supra man
11-09-2010, 11:56 AM
i'll look at the wires tonight and see what i can see. the cap looks fine on the contacts, its obviously not brand new but it looks like it shouldn't be causing a problem. i am betting that it needs a whole new tune up on everything just gotta wait another week till i get paid
11-09-2010, 03:53 PM
also run a can of inexpensive fuel solvent thru gas system to make sure all injectors are giving a good spray pattern.
11-13-2010, 02:21 AM
Easiest way to check the wires is get a spray bottle full of water. Spray the mist over the wires and look for arcing, very simple, easy and fast. It can also detect smaller leaks in the insulation than your eyes could normally see.
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