i have tried it all wires plugs injectors compression check moved wires plugs and injectors but nothing has helped got a solid cyl3 misfire runs like crap need help tried it all

Hows the compression on #3?

 

Also, the Subaru engine control software kills the injector pulse to one cylinder if it detects uncontrolled high idle RPM. If you disconnect the battery and the car briefly runs on all 4 and is idling high, you'll know that's what's going on.

 

Nathan

#1 and #3 were both at 180 psi, i did have a unexpected high idle code that hasn't come back it ran good for a few and has slowly ************ out now i cant drive it

There is sticky valve and checking secondary voltage on a scope type analyzer to actually See how one spark relates to the others. There is of course the hydraulic lifters and a reason they went away from them. Some tech more "in tune " to this may help you soon.

Have you disconnected the battery since the unexpected high idle code? I'm not sure that clearing codes with a scanner will reset this.

 

Check the #3 injector for a pulse with a "noid" light.

 

I'm skeptical about "sticking valve" theory with 180psi compression on #3.

me too i had the ex down and the valves looked OK ill try that in the am thanks so maybe ecm or bad injector wire? but with one bad injector the car should still run, it doesn't want to run at all

Edited October 5, 201015 yr by Dfreeman321

but if the ex valve dont open then that could be it, but with 180 in 1 and 3 ill check 2 and 4

it seemed to run better with the batt disconnected for a few then 10feet later dyed out no power 3 misfire and the noid light test seemed to be ok all the patterns where the same

Edited October 5, 201015 yr by Dfreeman321

no luck still. :-\

"Ignitor." "MAF Sensor." "Oxygen Sensors." All suggestions I have not been able to afford testing. I am having a very similar problem.. but mine only shows up after driving a while and on really hot days.

ECU.

 

A failing/bad ECU can cause a misfire on just one cylinder. It did for me and I replaced the ECU and it went away. Find one from a junkyard.

The no power was caused by a failing fuel pump that couldn't make more than 20psi. We replaced the pump with a used one, 32psi at idle and 60+psi with the return hose squeezed shut. It runs much better, but

 

There is still a cyl 3 missfire.

 

Tried swapping coil packs, ignitor, new plugs and wires, spare known good wires, injectors, checked crank sproket reluctor teeth for damage, checked t-belt timing, swapped out MAF. Swapped crank sensors.

 

The O2 sensor could probably do with replacing, it was the one that was downstream from a 2.5 with blown headgaskets for a while. We might switch back to the 2.2ecu that we swapped in for a while before we figured out the fuel pump issue.

 

We've shotgunned pretty much every known-good part we had available, to no luck.

The no power was caused by a failing fuel pump that couldn't make more than 20psi. We replaced the pump with a used one, 32psi at idle and 60+psi with the return hose squeezed shut. It runs much better, but

 

There is still a cyl 3 missfire.

 

Tried swapping coil packs, ignitor, new plugs and wires, spare known good wires, injectors, checked crank sproket reluctor teeth for damage, checked t-belt timing, swapped out MAF. Swapped crank sensors.

 

The O2 sensor could probably do with replacing, it was the one that was downstream from a 2.5 with blown headgaskets for a while. We might switch back to the 2.2ecu that we swapped in for a while before we figured out the fuel pump issue.

 

We've shotgunned pretty much every known-good part we had available, to no luck.

 

I hate to say it, but you might be looking at a bent or burned valve on cyl 3.

If it was a valve problem then it would show on a comp. test. Burned exhaust valve would probably be around 75 psi or less. The one I just did was 60 psi and the one before that was 5 (yes just 5) .

 

GD