dropping a cylinder

[dsmtalontsi95]

I have a 2g with a 6bolt swap. For some reason if you rev the car at 3500 I drop cylinger 3, it also causes the tack to jump up about 500 rpm (the needle on the tach, not the motor). So far I've changed out cas, coil pack, and wires. The car runs fine until you rev to 3500 and drop 3 even if you let off the cylinder never comes back. If you turn the car off and start it right back up it's fine (all 4). We can pull the wire and it has spark after it drops that cylinder (pulled the wire while the car was running). That leads me to beleave that its the injector. What tells the injector to fire? The only thing I have left to check is the ecu unless you guys know of anything else that could cause this issue.

 

[nightracer91]

You most likely have an injector problem. Do you have access to an ohmmeter? Wen it starts misfiring, pull the connector from cylinder 3 and check the resistance. I should be 2-3 ohms. I had a misfire somewhat like that, my injector would read 3 ohms when it worked and 1.2 MegaOhms when it was misfiring. But check that and see what it is reading. Post your result.

 

[dsmtalontsi95]

Ok if what your saying is the problem then what is causing it? Are you saying check the injecto or the conector?

 

[dsmtalontsi95]

Well I tried to install link so I could do a log. Well it started to burn my ecu.

 

[romeen]

Are you sure the ECU wasn't damaged before you installed link? Because that could be your problem right there.

You may also want to consider a bad power transistor module. I believe the tach signal comes from the PTM.

http://www.dsmtuners.com/forums/art...-how-test-power-transistors.html#post50386400

 

[dsmtalontsi95]

what/where is the power transister? could you show me a pic?

 

[snowborder714]

http://www.dsmtuners.com/forums/art...bay-electrical-connections.html#post151528353