Help Rb25 Won't Idle Or Drive.

[mook1]

so i just took out my microtech and put a stock s1 ecu in my s2 r33..

reconnected the afm and plumbed back the bov.

Now she won't idle. When driving boost guage shows its making boost, but it kinda bunny hops along, with spurts of mild acceleration.

any ideas?

[mook1]

its also fluttering with the stock bov all connected up... errr... is it broken?

[hrn33_r33]

sounds like a boost leak comin from somewhere, check all your pipe work for leaks

or it could be the stock ecu cant handle wats done on the car, a microtech would have been tuned 2 suit timing an fueling etc,

[JMW]

Series 1 ecu i think is slightly different to series 2 as series 2 do not have the ignitor pack on the coil cover.

[chrissso]

Any mods?

[hrn33_r33]

good point james, the ecu are different in S1 and S2, an the S1 requiring the ignitor, would cause the car not 2 fire properly due 2 the missing ignitor pack,

[mook1]

ignitors are in the coils in s2, not in the ecu. but maybe..

fmic

t3/4 turbo

pod

zorst, no cat temp sensor.

[hrn33_r33]

my S1 r33 runs fine without the cat sensor, an is the stock ecu,

only times ive had probs like your sayin is when i had a crack in the cooler pipe connectors, due 2 loss of boost,

but after james mentioned it im sure ive heard that S1 an 2 ecu aren't interchangable due 2 the s1 sendin info 2 the ignitor pack, same as an S2 ecu not workin on the S1 due to the same kinda prob. also manual an auto ecu bein slightly different as well,

[abulurd]

I had same prob just the other day, it turned out to be crack in one of the air hoses opening up under boost

[mook1]

anyone got any radical ideas on how to check for vac leaks.. there is alot of hoses.. and nothing is making noticeable hissing... grr

[battery]

put the microtech back in and see what happens

[mook1]

microtech is sold.

update. fixed one vac leak, cleand afm.

now it idles perfect for 30sec, then shuts off. any ideas?

still drives like a dog.

[mook1]

fixed...

resistor pack thing for the fuel pump ( in boot lhs near jack ) was unplugged and knock sensors were unpluged.. both had diff readings so i just bypassed them at the ecu using 500kohm resistors for each.

done. cept i pulled my car to peices and wasted 8 hours of my time... grrrr......

Edited March 31, 2009 by mook1

[bumble_bee]

hey i had a simliar problem..but mines on and off..

hasnt done the surging thing in awhile..did it really bad lik a week ago..almost had to get towed..

but it hasnt done it eva since..cant firgure it out..

but i do get sometimes rough idles now and then..

and i clean my iacv too..

and feels lik i cant rev..esp. round the 2000-3000rpm mark..like its losing power..its weird ay..but its goes away...

i dont no if its the afm?coz i havent got a spare or no anyone wit a s2...

so i cant try that..

ive cleaned it wit crc mass air-flow cleaner..but yeah..

go new plugs..all gapped good..

and i got spitfires..

ive cahnged the 2 silicone hse..and check all clamps..doesnt feel lik a leak..or from i can tell...

the topic i started is here...

http://www.skylinesaustralia.com/forums/We...te-t262169.html

Edited March 31, 2009 by bumble_bee