s4 T2 Running off one rotor. HELPPP
 

Ok I have a 88 vert with a T2 swap. I am still working the bugs out. But I cant seem to figure out why its only running off 1 rotor. It started by just doing it on start up and the other one would then fire once under load. I have changed the coils, plugs and wires. Also all My idiot lights came on But my alt is still putting out the proper volts. Any Ideas?

Are your fuel injectors plugged in properly? The t2 and n/a harnesses dont plug in the same way. If both primary plugs are on the same rotor then the other rotor will only get fuel when the computer flags secondaries (under load)

I have an 88 vert with a TII swap that would randomly decide to run on one rotor while driving down the road. I ended up replacing nearly the entire fuel system. Every time I would replace something, it would run great until I tried to drive it out of town and then it would come home on a tow truck. The key turned out to be a clogged primary injector.

Check your plugs for clues. If you find that one set is brown and chalky, then that rotor is being starved of fuel. If one set is black, oily, and smells like fuel, then it hasn't been getting spark and the ignition system is probably the culprit. I'm betting it's the injectors. Try swapping your primaries and secondaries and see if it'll start up and idle fine.

What injectors are you using? Are you running a resistor pack?

They Are the stock Injectors I will Try that. It seems to run Well for a few days and then something else would act up and then its back to one rotor. I love the rotary engine. But good lord I coulda had an ls1 for the money i have in it.

Swapping in an engine that didn't come with the car is always going to be problematic. At least this engine was designed to fit in it. Is it a series 4 engine? Which ECU?

It's a hassle trying to work out the kinks in these cars... I'm still working out a few issues on mine and it was already swapped when I bought it. But when you get it all sorted and go boosting through the mountains with the top down, it's totally worth it.

Having a better maintained rotary helps remove most of the issues.

in any case.....

remove the primary rail with the injectors attached (theres a few ways) and aim them into a small container or even just a few rags as you'll need to crank the engine but only for maybe 5 seconds (obviously you'll need a buddy for this).... just enough to see if both primary injectors are firing properly.



Sometimes checking the spark plugs doesnt always work, some times.


If both primary injectors are firing, then reinstall them as your problem is probably ignition related..... replace spark plugs or check them for spark (for god sakes make sure that you remove fuel pump fuse and let the motor die before doing so) , if that doesnt help, then check for spark coming from the coils etc etc.




Keep the troubleshooting as simple as possible..... to have a running engine you need air, compression, fuel, and spark..... missing any one of those and you have nothing. And check each system in its entirety before jumping to another part of the equation (meaning dont go from fuel to spark without going through the entire chain)

Well my injjectors are working. It has a new fuel pump and filter as well. Still on rotor. My leading plugs has oil on them. And and were swapped out for new ones. New wires new trailing coils, and replaced used leading coils. Its tempermental. I have noticed that the second rotor would fire around 4k if its underload.

Working may not be working enough. Still curious what year injectors/motor you are running and if you are running a resistor pack. Also, have you tested each plug on the shock tower bolt old school style?

yet another recipe for a blown motor. yes, of course it will kick in somewhat because your secondary injectors are coming on after that but the rotor will be running severely lean.

you need to remove the UIM and do the fuel injector tests in the FSM and THOROUGHLY inspect the primary injector wiring, clips and injectors.

they are the 550cc injectors. no resistor pack. And also its an s4 engine. out of an 88 as well.

read post 2 again.. confirm... i have been there and seen that..

if it runs perfect after 4k then it may well be a retarded connection, both primaries connected to #1 rotor primary and secondary injectors.

I had an issue similar to this after installing my lt8. I missed a block to chassis ground. Fixed that and haven't had an issue since

My 88 ran great for 3 yrs then 1 rotor started dropping out randomly. Like twice a month for like 1/4 of intown trips. Then one day it just stayed on 1 rotor. My fix was replace the injector connectors. She ran for another 2 yrs without any problems besides hot starts since the engine was tired by then.

My money is on
A. Post #2
B. Primary injectors
C. Just send those damn things to get serviced... all of them not just primaries.

Post #2, or low fuel pump voltage till decent revs maybe?

Well the issue i have with post two is it ran before on both rotors. and ran amazing once it was warm I am gonna pull the primaries again. i even hard wired the fuel pump in. to make sure it was getting 12v. (Yes i know they are not supposed to run all the time) I also ordered new plugs again since the leading ones are black now.