rb20det wontfire/cough, only turnover

Discuss the RB20, RB25 and RB26 series engines.
manlove891
Posts: 27
Joined: Fri Mar 12, 2010 4:45 am

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maybe my replacement ecu is no good? any idea how i can make sure ecu is functioning without another rb20? im the only one with another rb20 in my area and its in my living room so no chance of testing it on that


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VStar650CL
Technical Expert
Posts: 8407
Joined: Thu Nov 12, 2020 1:25 pm
Car: 2013 Nissan Altima 2.5 SL
2004 Nissan Altima 2.5 S

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I'm out of ideas, old son. You'd think it would at least backfire. Short of timing the signals out with an oscilloscope, I can't think of any way to test the ECU.

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VStar650CL
Technical Expert
Posts: 8407
Joined: Thu Nov 12, 2020 1:25 pm
Car: 2013 Nissan Altima 2.5 SL
2004 Nissan Altima 2.5 S

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I dunno what the guts of an RB20 CAS are supposed to look like. Is it possible it's 180 out?

manlove891
Posts: 27
Joined: Fri Mar 12, 2010 4:45 am

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anyone on the forums you might know that can help? this is where we are.
fuel- y
spark- y
ecu code- 55
zero combustion what so ever.
engine was running when parked then it flooded.
theoretically it should only be electrical problems.
ecu was replaced and is working however i do not know if it is functioning correctly as i have fuel spark and timing done.

manlove891
Posts: 27
Joined: Fri Mar 12, 2010 4:45 am

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going to do a compression test before the day is out just to rule out compression loss as a factor. do i need a leakdown test for valves or will valves be included in the compression?

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VStar650CL
Technical Expert
Posts: 8407
Joined: Thu Nov 12, 2020 1:25 pm
Car: 2013 Nissan Altima 2.5 SL
2004 Nissan Altima 2.5 S

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You only need a leakdown test (or a wet test) to isolate the cause of a compression loss. If they read healthy on a standard dry cranking test then usually nothing more is needed.

manlove891
Posts: 27
Joined: Fri Mar 12, 2010 4:45 am

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so i was messing around with the timing. gas pedal pressed all the way after like crank 6 it started to sputter but it did not start, atleast i have some sign of life. maybe i just need to go over timing in depth and just let it crank on a full charge with the pedal to the floor


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