HELP m30 running and idling issues

[chadthestampede]

Maybe. The cat shouldn't turn red hot unless it is clogged.

I will say that I had the exact same problem on my b32, seriously, EXACTLY, and I fixed it by replacing the fpr and ignition coil. Now it was kind of a freak thing with mine so I won't guarantee that will fix yours. Then again the b32's have a cold start valve that I had to plug off to keep it from flooding the engine so that was part of the problem.

Was the car sitting for a long time or something? I know mine had bad gas in it.

[vic_325]

its the same exhaust i used for my m20 and it was fine. could one day of crappy running m30 clog the cat?


also iv read about adjusting the tps... how is that done? just loosen and twist the tps

[chadthestampede]

Cat is probably clogged.

[vic_325]

i got my m30 all finished today. its a b35 and im using the m20 harness.

i first started it without the o2 sensor plugged in at all because my exhaust doesnt have an place for it yet. with the sensor uplugged it wouldnt rev past 2000rpm, it would cut out and rev to 2000 again kinda like it was rev limited.

i plugged the o2 sensor and just kept it sitting in the front battery tray and the engine now reved up but idles like crap and eventually stalls.

all day iv been trying to figure it out.

now, it takes 2 attempts to start it. first it starts and shuts down, second it starts and idles above 1000-1500 rpm. not the smoothest idle but stays running. once i rev it past say 2500 - 3000 and let off the throttle it won't idle and just shuts off.-- then takes two starts to get it to idle again.

when driving, it hesitates and stumbles with no power and never running smoothly at any rpm. and i can;t completely let off the throttle or else it shuts off.

today, i changed afm, icv, fpr, sparkplugs, tps, ran it with o2 plugged and unplugged, i even tried the 173 m20 ecu and that didnt work at all.

just before i called it a day, with it running i noticed tons of smoke from under the car ... the cat was turning RED HOT!! ( with the o2 plugged in but just in the engine bay) why is it so hot ?? Im stumped.

i need help,

Thanks,
Vic