random missfires

extendor · 12-20-2004, 01:01 PM

Hi to everyone.
I am hoping that this problem has come up before for some of you. I have a Mk3 Supra that has a slight random missfire when you slowly pick the engine revs up from idle to about 3000. It has no pattern and cannot be traced to any particular cylinder (as far as I can tell). I get a few seconds without a miss then two very close then a gap etc.

Performance is fine and there is no overheating, water in oil etc and I know the CHG is good as I did it myself about 200Km ago.

I dont think it is the plugs as they are still good when inspected and have only done about 30,000. The air filter is clear and the throttle housing is clean. I have cleared all the vacuum pipes etc. I have visually checked all the connectors and the wires going to them for breaks etc.

This close to Christmas I am hoping for a low cost problem - hehe

Thanks and all the best wishes to you all.

extendor · 12-21-2004, 11:35 PM

Hi,
I have had the credit card out again and bought a set of tungsten plugs - just in case it was the obvious but this has not cured it. I cleared the codes and went for a test drive and get a code 21 Oxygen sensor. I dont know if this would be the problem. Have any of you out there had any experience of Oxygen sensors and the problems they cause. I dont think I have any choice but to bust the card limit and get another sensor but some advise would be very welcome.

Happy Christmas to one and all and lets hope for a few more smiles in '05 for everyone.

suprra_girl · 12-22-2004, 10:05 AM

hey

good luck with your problem supraforums should help out

save bandwidth from having two exact same posts

but as i said on there....
change ur crank to 0
you should find yourself in limp mode i would think being that far out on timing

12-22-2004, 10:05 AM	#3
suprra_girl 7M POWAH! ;) Join Date: Jun 2004 Location: New Zealand Posts: 2,312	hey good luck with your problem supraforums should help out save bandwidth from having two exact same posts but as i said on there.... change ur crank to 0 you should find yourself in limp mode i would think being that far out on timing __________________ Please use the forum to ask your questions as they will get replied to much faster than pming me Pics of my build. "Good girls are just bad girls that don't get caught" Do a diagnostic first!

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12-20-2004, 01:01 PM	#1
extendor Stock Join Date: Nov 2004 Location: Devon UK Posts: 14	Hi to everyone. I am hoping that this problem has come up before for some of you. I have a Mk3 Supra that has a slight random missfire when you slowly pick the engine revs up from idle to about 3000. It has no pattern and cannot be traced to any particular cylinder (as far as I can tell). I get a few seconds without a miss then two very close then a gap etc. Performance is fine and there is no overheating, water in oil etc and I know the CHG is good as I did it myself about 200Km ago. I dont think it is the plugs as they are still good when inspected and have only done about 30,000. The air filter is clear and the throttle housing is clean. I have cleared all the vacuum pipes etc. I have visually checked all the connectors and the wires going to them for breaks etc. This close to Christmas I am hoping for a low cost problem - hehe Thanks and all the best wishes to you all.

12-21-2004, 11:35 PM	#2
extendor Stock Join Date: Nov 2004 Location: Devon UK Posts: 14	Hi, I have had the credit card out again and bought a set of tungsten plugs - just in case it was the obvious but this has not cured it. I cleared the codes and went for a test drive and get a code 21 Oxygen sensor. I dont know if this would be the problem. Have any of you out there had any experience of Oxygen sensors and the problems they cause. I dont think I have any choice but to bust the card limit and get another sensor but some advise would be very welcome. Happy Christmas to one and all and lets hope for a few more smiles in '05 for everyone.