My Rex is Misfiring really badly Please can u help

gandyRX · February 14, 2009, 02:10:47 PM

i allways thought blue smoke was oil, black/grey smoke was fuel and white was water

a.tapos · February 15, 2009, 11:53:05 AM

Yeah blue smoke is oil,white will be fuel or coolant or both,though the coolant smell is quite obvious the fuel smoke will make you faint .

gear1275 · February 15, 2009, 07:09:13 PM

thanks guys, i will check the exhaust for leaks. i will also check the intake sytem. i have got a standard ecu also so i will try re-setting it aswell. oh and i will check the earth too. is it just one main earth strap? and if so, where is it located? im not new to mechanical work, im just new to rotaries!! also, how can i check fuel press. whilst driving?

a.tapos · February 15, 2009, 08:21:43 PM

The main earth strap is right next to the plugs its a thick black wire it also then connects to the body then the battery so make sure theyre all clean.The other is on the inlet manifold rigth next to the 02 sensor multiplug its really thin,
You would need to get a fuel pressure gauge from somewhere and put it in the feed pipe to the injector rails then stick it to the windscreen or have someone hold it and monitor it when the fault occurs to see if it drops off,

gear1275 · February 17, 2009, 07:27:02 AM

okay then, i will try cleaning all of the earth straps tonight when i get home from work and try re-setting the ecu also, i will also look into getting that fuel press. guage. i will post my findings tonight, thanks again

fly · February 17, 2009, 12:34:24 PM

Have you checked the fuel pump voltage?

gear1275 · February 17, 2009, 05:41:49 PM

guys!! its all sorted and working fine now!
it must have been a combination of what i have just done which is, re-set ecu, replaced vac hose from map sensor to plenum with fancy new blue hose and cleaned earth strap from plenum to bulkhead. so many many thanks to everyone for their help on here for teaching me a bit about my car.
the next job for the car is a new clutch slave cylinder because i found out mine was up the spout after changing the clutch and replacing all the vacuum hoses with nice red new ones!!
cheers, james

a.tapos · February 22, 2009, 08:30:06 PM

good news mate,well done

gear1275 · March 01, 2009, 06:38:00 PM

thanks a.tapos, completely unrelated but, how can i tell if i have an 8 of 16bit ecu? im pretty sure i have got the standard one on there that says n3b7 on it and is a uk car if that helps
thanks again

DR SCHNITZEL · April 07, 2009, 05:27:43 PM

Quote from: Aceman;556831Mine had a missfire (before the engine gave up the ghost with water seal failure..)

Used to occasionally stall at junctions. Similarly, at random times it would bog down while driving and then once the spark kicked in again you\'d have a huge bang. Neighbours loved it.

Changed plugs, leads, etc etc. Eventually decided it must be a short somewhere in the loom. We bypassed the loom running a direct power supply to the standard ignition amp (using a relay running off the ignition to cut the feed when the car was off!) and this solved all.

Just trying to give you some hope...

i think i need to try that, mines misfiring and my loom is knackered

My Rex is Misfiring really badly Please can u help

fly

DR SCHNITZEL