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Old 09-03-2002, 03:12 PM   #1
Scooby Specialist
Member#: 17080
Join Date: Apr 2002
Location: Col, Ohio. DA BURG!
2002 WRX, Silver
AWHP ?? 12.2@115MPH

Question has anyone had this problem?

I have the Vishnu Stage 0.
When I get on it, it throws a CEL!
When i pull the codes, it is the same codes..301,302,303 and 304
Missfire in all 4 cylinders
has anyone got all of these codes @ once?
Could it be the piggyback ECU throwing these codes?
Could my sparkplugs need regapped?
Is it normal to get the 4 missfires?
Help Please!
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42202sub is offline   Reply With Quote
Old 09-03-2002, 04:28 PM   #2
Scooby Specialist
Member#: 13911
Join Date: Jan 2002
Chapter/Region: MWSOC
Location: Louisville, Ky
2002 Maxima


Someone in the MWIC forum has the same problem and I don't think he has the Vishnu...
larryg is offline   Reply With Quote
Old 09-03-2002, 04:40 PM   #3
Scooby Specialist
Member#: 10186
Join Date: Sep 2001
Chapter/Region: MWSOC
Location: some kind of bmw tech...

It could be that the colder plugs that you installed are fouled.
codean is offline   Reply With Quote
Old 09-03-2002, 09:26 PM   #4
Scooby Guru
Member#: 7089
Join Date: May 2001
Chapter/Region: NWIC
Location: Western Wa
Default Re: has anyone had this problem?

Originally posted by 42202sub
Could it be the piggyback ECU throwing these codes?
Yes. Unless you're feeling actual misfires, it's the unichip. The unichip alters ignition advance by intercepting and changine the crank angle signal. The stock ecu compares the crank angle signal and the cam angle signal to determine a misfire. With the altered crank angle signal, there is now too much difference between the two, and the stock ecu thinks you're misfiring.
Austin is offline   Reply With Quote

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