To my ITR buddies:

I am doing an EG Type R hatch for HPDE course work and am in the process of getting the engine to run correctly. Here is the background on this engine:

I bought it from hmotorsonline about 7 months ago. We started the engine up once it was installed and it ran great. We did some wiring on the ECU and finally got it working with Kenji's P28 (thanks Kenji). After wiring and the engine now having VTEC it felt strong (still need dyno tune though). A couple of days ago i noticed a somewhat bad idle. Like the car shakes up to 3k RPMS. I thought nothing of it so we installed Skunk 2 Stage I cams last night and started it up and the bad idle was still there. We figured it out to be the #4 cylinder not firing. We checked the plugs, wires, compression (240 across board), and the timing marks after doing the cams and cam gears.

We thought it was a bent valve but with those compression #'s it couldn't be. The only thing we can think of now is to swap injectors and see if that might be the problem. The car is not throwing an ECU code at this point. Can anyone give us any insight?

Thanks very much guys

 

Swap a good plug into that cylinder and see if the same thing happens.

 

take a temperature gun and check the #4 header runner. if its not hot, there is the problem.

I would then get new plugs, wires, cap, rotor, and go from there.

 

Could be a problem inside the distributer...

Can you see fuel on the plug in cyl four? If so, its not an injector issue...
Take the spark plug out and ground it to the frame of the car...turn the engine over a few times to see if you get spark.

Make sure the spark plug wire is secured to the plug...

 

it's not the plugs - we switched different plugs into that #4 cylinder and the same issue. We also changed the wires around to see if it was a bad wire. Same problem. We did not test the ohms on the wires. That is one thing we need to do at this point. The car has new plugs, cap, and rotor. Wires were re-used as the engine is guaranteed to have less than 30k miles on it.

 

Mike did you figure out this problem yet?

 

Swap the injectors around. Check to see if you have pulse width from the injector harness.

 

check inside the dissy also...The contacts may not be sufficient.

 

i had the same issue with my 300zx, and heres what we did, replaced plugs, new wire harness for the spark plugs and fuel stuff, and one new injecter for the cylinder that wasnt fireing, now it runs perfect.

 

thanks for the tips guys. i will definitely try anything at this point since we are pressed for time on this project.