ok i have a 91 tII the 1st rotor plugs look good i pulled the 2nd rotor plugs and they look brand new like i just pulled them out of the box i checked injectors actually i just reaplced that side injectors the car runs but will only fire on one rotor any ideas what this could be any help wouls be nice

 

Any check codes?

Maybe a clogged #2 primary injector.
Bad spark wires (both) to #2

Compression check it.

 

compression checking it now got power and everything to injectors no codes and i replaced all the injectors with new ones new wires also

 

If they look just like they did when they came out of the box then you can't be getting any fuel to them. If you were getting fuel but had a firing problem, then they would look like flooded crap.

 

The first thing you have to do is figure out if it is missing fuel or spark.

If it is a spark issue start with the coils.

If it is a fuel issue then your injustors are not getting signal... Check the wiring. BUT I would check the injuctor ballasting resister pak that is located under the air box. I had one of the resisters open on me and it did the same exact thing you described.

Mike

 

i checked the injector harness and yes they are getting signal power just not firing on that one side

would this resistor pack caus one side of the injectors primary 2nd dairy injectors on teh 2nd rotor not to pulse or i have talked to rotorsports racing and they said it could even be the ecu i have plenty of spark one side 1st rotor has carbon deposites on the plug the 2nd rotor side pluga look band new not even wet

compression checked out awesome on the engine please help

 

If you had no spark but you did have fuel, then those spark plugs would be covered in fuel. Plus you would be able to smell the excess fuel, so it sounds like you have a fuel problem, not a spark problem. If you checked the pulsations and they are good, then maybe it is an injector issue. It could be that one of your primaries isn't firing. If you feel like taking the time, you could switch your primaries with one another and see if the problem persists on the other rotor. Or, if you can get your RPM's above 4,000, then your secondaries would start firing and if that rotor starts firing, then both your secondaries are working and it is just that one injector that is messed up. It could be something electrical, but I couldn't help you there.

 

The injector signal comes from teh ecu through the injector and then to and through the resister before going to ground. look at the wiring diagram in the factory manual.

Mike

 

i put new injectors in it and still have the same problem could i ground the wires coming off of the injectors for a safe and secure grounf other than that i am clueless compression is great the car does run i take it past 4 grand and is still runs on one rotor just no fuel could the rails be clogged
i mean if they were clogged then the first rotor injecotrs would be doing the same thing right????
is their a way to check the injector resister pack that mike is talkin about??? any other ideas!!!!

 

yes you need am ohm meter. I am looking for a wiring diagram for you on lone right now

 

Check PM

 

Check PM

 

i checked everything the resistor pack and it is checking good any other ideas on why the 2nd rotor isnt getting any fuel and not firing

 

Are you absolutlely sure that the primary injector to the rear rotor is getting signal? It should be a square wave on an ocilliscope. Then the other pin on the injector electrical plug should go to ground with something like 7 ohms resistance.

just for laughs.. have you cranked the engine over looking at the spark plugs outside the engine (sitting on somehting grounded) and actually seen them spark? Use a spare known good plug and keep alll the plugs in the engine while doing this, just remove the plug wires so it won't start.

Also, doesn't the ecu cut fuel to the rear rotor when the MAP sensor senses over boost or detonation?

What caused the car to start doign this?

 

yes i am absolutly sure b/c i did the ohm test and checked the injector
what started doing this? well i put a new tII motor in it it used to be a n/a it was a complete drop out from a japaneese car so i had everything i used the japanesse wiring harness and ecu all i did was unplug the engine harness from the ecu put the motor in and tried to fire it it started and since the day it started it has been running on one rotor compression is good i have checked this numerious times i will try the injector signal again here in a feww seconds any other ideas

 

There's the possibilty that your injectors are just bad. I know they're new and all but still. You should have them checked to make sure they are working properly. Obviously you're not getting gas and they are getting signal. So either the fuel rail is screwed or the injectors are.

 

A quick test - unplug the pressure sensor.
Then see if #2 fires.
You should get a check code, but maybe it will run.

 

this may be somehting totally "out to lunch" but I almost did it with my FD one time. I almost pluged a secondary wire up to one of the primary injectors. If I lived closer I would come over and give you a hand. A fresh set of eyes sometimes helps.

You may have an open in the wiring harness? swap primary injectors front to rear rotor. Just dropping ideas here since i do not know what you have already done. Mike

 

i have already tried swapping injectors it has to be something in the wiring b/c i unplugged the pressure sensor and the check engine light did not come on also the heater and the wipers do not work so i am almost leading towards a wiring problem is their any other way to make the check engine light come on so i can try and pull a code maybe??? or could the co,puter be in a limp mode b/c something is wrong???

 

problem solved the ecu was bad i am getting a new one on monday thanks for all the help guys

 

Let us know how it runs