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R33 Running Rich, Rough and Struggling to Start

Sweetalka
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Sweetalka Rookie

Sweetalka

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Posted
R33 Running Rich, Rough and Struggling to Start

Hi all,

New to the site after trying to find answers through existing posts and come up with nothing

1993 R33 RB25DET (bought it NA and put the RB25DET in it) its been sitting for a year before I decided to register it.

was running somewhat fine misfiring and rough on high boost through gears but idled ok. 5 weeks into it and its overfuelling extremely strong blowing black smoke and sounds like a wrx no matter what speed im doing. on start up whether it was hot or cold it sounded like a dead battery but eventually wound over, this is progressively getting worse taking longer and longer to wind over, when it does wind over it takes a while to start (thinking fuel issue)

im getting 350km out of a tank and extremely fuelly inside and out of the car.

pinging when boosting

was wanting advice for where to look first? was thinking to test coil packs, maybe the CAS (a tune maybe?) suspected timing issue maybe?

standard motor and ecu with the usual mods.

I am using the non turbo exhaust could that play a part?

any help appreciated so I can start eliminating potential causes. thinking maybe its running advanced can I alter this via the CAS?

mechanically minded on naturally aspirated cars but bring fuel injection and ECUs in and im lost

tridentt150v Grand Master

tridentt150v

Posted
Posted

A CAS wouldn't stop your motor from winding over.  What boost are you running?  Timing and other stuff wouldn't stop you winding over, a timing belt that is out could, but it has to be out a lot and then you are in even more trouble. 

Sounds like hydraulic lock, but I can't figure out how unless the fuel pump is still alive and you have a leaking injector - but that's unlikely.

 

blind_elk Grand Master

blind_elk

Posted
Posted

Cleaned the injectors? Replaced the fuel filter? Running the DET ECU? Set correct base timing?

How many litres is "a tank of fuel"? If you are continually boosting, then 350k might not be such a bad consumption rate.

Your starting problems - maybe a bad earth, or a dying starter motor.

Sweetalka Rookie

Sweetalka

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its running standard boost, fully serviced although I haven't checked the injectors as yet a full tank as in around 45-50 litres. I thought it was initially the starter however when you pump the throttle it seems to have some sort of affect in starting, I can hear the fuel pump kick in on reds and at lights I can hear it click on and off so im assuming that's ok??

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