hi guys, last year i purchased a brand new 13b block and had it rebuilt by a reputable rotary builder here in NZ, the block was dowelled and seals replaced with rotor master seals. The block has travelled less than 1000km, it wasn't boosted once except for the dyno tune, anways.. just last week as i was reversing out of the driveway it started backfiring like crazy, the engine than started rattling hard and wanting to die, it felt like the car was running on one rotor. I drove the car once every few weeks , in between the weeks it was never cranked, what possible problems do you think could have caused the engine to rattle + backfire + wanting to die out?

i can now confirm that the car is running on one rotor, could this be a spark plug issue or clogged injectors? and as i said before the car was only driven once every 2-3 weeks

any help would be appreciated

thanks

 

Does this happen all the time or only sometimes and then returns to normal?
Sounds like my problem, but if I kept mine running long enough, it seems to return to normal.
I noticed my FPR was leaking so it may be a fuel pressure issue is what Im leaning towards.

 

It's possible it's an injector that's stuck open and flooding one rotor. Do you have any diagnostic gauges (fuel pressure etc) and/or something like a PFC commander to tell us inj duty cycles?

 

I do, and will get he info off of Halwin tomorrow.
I hope the OP does as well since this might hlp the problem.

Needless to say, i need a new fuel system.

Thanks and good luck OP

 

Compression test first, rule out a blown engine. Next, if you can access the primary injectors with the engine running pull the front primary injector clip, if it runs the same then that's the rotor with the problem. Pull the rear to verify, it should die. Or visa versa if it's the rear with the problem.

Once you figure out which rotor is not firing you can focus your efforts on that one. Pull the plugs and make sure both are firing, If they are then you know it's fuel related. Stick an ohm meter on the primary injector. It should read between 5 - 13 ohms for bosh and stock injectors. Basically anything over 1 ohms as no reading means the injector coil is burned up. If it checks out ok, put 12v on it and listen for a click, or you could do that instead of the ohm test. That should be enough to figure it out, If not take the rail out crank it over and make sure fuel squirts from the primary injector.

 

Just trying to think simple... i would also check the plug wires and make sure they are good/connected well. If the fuel system checks out I would then look at the coil packs.