Misfire at about 6K rpm
#1
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Misfire at about 6K rpm
Hi guys,
a friend of mine has an 1992 civic SI and blew his engine so we replaced it with an 1994 civic SI engine ( D16Z6 )
now we got like a misfire at about 6K rpm.
i taught it was the head so i had took it out and brought it to the machine shop to get it milled.
put the head back on and still misfire in the top rpm.
i have changed the dizzy, cap and rotor with one that has no prob and worked fine but still has the same prob.
when standing still and you rev it slowely the wideband give when missfire an 12.8 AFR if i'm not mistaken.
What could be the problem cause we are trying to sort it out so we can race this sunday.
please let me know guysss
Thanks
a friend of mine has an 1992 civic SI and blew his engine so we replaced it with an 1994 civic SI engine ( D16Z6 )
now we got like a misfire at about 6K rpm.
i taught it was the head so i had took it out and brought it to the machine shop to get it milled.
put the head back on and still misfire in the top rpm.
i have changed the dizzy, cap and rotor with one that has no prob and worked fine but still has the same prob.
when standing still and you rev it slowely the wideband give when missfire an 12.8 AFR if i'm not mistaken.
What could be the problem cause we are trying to sort it out so we can race this sunday.
please let me know guysss
Thanks
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Re: Misfire at about 6K rpm
Nopes not any cell.
i did because the engine came with an broken Timingbelt and an broken waterpump, so he said he better do that because with his first car he had an waterpump failure and needed to miledown the head, tha's why he let them did it.
could it be an mapsensor maybe ??
i did because the engine came with an broken Timingbelt and an broken waterpump, so he said he better do that because with his first car he had an waterpump failure and needed to miledown the head, tha's why he let them did it.
could it be an mapsensor maybe ??
#4
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Re: Misfire at about 6K rpm
learned this one last week...
If your thermostat is stuck open and the motor never reaches temp it will throw it in limp mode and cause this...
worth a look
If your thermostat is stuck open and the motor never reaches temp it will throw it in limp mode and cause this...
worth a look
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Re: Misfire at about 6K rpm
but when in limpmode it should throw a cell and rev til 4K, this wil pas the 4K rpm and do this thing on about 6K.
Temp when i datalog i get 200 F.
Temp when i datalog i get 200 F.
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Re: Misfire at about 6K rpm
he will be back on friday with the car so i wil be loging what hapens on the rpm rage to try to see, but any help would be apreciated.
btw it is an turbo D16Z6 engine stock internal
btw it is an turbo D16Z6 engine stock internal
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Re: Misfire at about 6K rpm
The car ran with that tune on the old engine a same D16Z6 also turbo an performed VERRY VERRY well, but i will be tuning the car again Friday to check.
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Re: Misfire at about 6K rpm
i fully agree on you on the 2 engine not the same part.
new plugs and new wires, but i will be tuning the car again so i will check.
thnx for the info
new plugs and new wires, but i will be tuning the car again so i will check.
thnx for the info
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Re: Misfire at about 6K rpm
OK so far i chaged : Mapsensor, TPS sensor, Dizzy, Cap, Rotor, Wires, Plugs ( 3 sets ), Vtec selenoid, Fuel pressure regulator, Fuel pump and still it does the same, i also tried with tuning but still nothing.
opend the wastegate to check and everything is ok in there.
what i will do is change the head.
when standing still it does it above 6300 RPM, below that it's fine, but when driving it does it at about 5K rpm.
what else could be the problem ??
opend the wastegate to check and everything is ok in there.
what i will do is change the head.
when standing still it does it above 6300 RPM, below that it's fine, but when driving it does it at about 5K rpm.
what else could be the problem ??
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Re: Misfire at about 6K rpm
octaan is 95 boost is lowerd to 7 psi was 11.6 psi first.
i checked the tune and can't find anything wrong.
i'm gonne check from the weekend to change the head and see.
i checked the tune and can't find anything wrong.
i'm gonne check from the weekend to change the head and see.
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Re: Misfire at about 6K rpm
Timing is OK set at 16 deg, i locked it into Neptune to set it down.
fuel filter i did not replace, that's a good one, and he does not have an fuel pressure gauge.
O2 is disabled in the system, he use an AEM wideband only
fuel filter i did not replace, that's a good one, and he does not have an fuel pressure gauge.
O2 is disabled in the system, he use an AEM wideband only
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Re: Misfire at about 6K rpm
Both, but what i find so weird is why is he doing that now and with the old engine the wideband was the same.
could it be like a bended valve ??
compressuin is 200 to 210 PSI on each cylinder
could it be like a bended valve ??
compressuin is 200 to 210 PSI on each cylinder
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Re: Misfire at about 6K rpm
If it was a bent valve it would only affect that one cylinder im pretty sure. I dont know much about turbo applications and how much compression you're going to have but that seems like a lot to me. If you have that compression i'm pretty sure you need a higher octane gas.