lbs_ft
06-09-2011, 08:32 PM
Hello all, once again I come to you in need of help...
I had this problem with my last twin cam, and this is the second time I've had this same issue with the newly rebuilt motor, with only 1300 miles on the odo. The #2 injector won't 'seat' correctly, and, therefore, the motor will only run on 3 cylinders. I know this is absolutely terrible for the motor, it must put a lot of unnecessary strain on a lot of parts, so I always aim to fix it asap.
Seeing as this is becoming a common occurrence , I've come to a couple conclusions already:
1) The wiring harness/ECU is fully functioning, I used a diode to test, and all 4 injectors are receiving power correctly.
2) I have spark on all 4 plugs.
3) Compression is 190 across the board, perfect.
4) All 4 injectors DO fire correctly.
So, to provide basic information: car is a 1990 coupe, harness is 93 twin cam, engine is 96 KA24DE. Last motor was a 93 KA24DE, and I'm re-using the fuel rail from that engine.
So here's what happens: driving fine, all of a sudden, huge drop in power, car smells like gas, exhaust sounds like a boxer motor. Pull over, pull #2 spark plug boot, no change in shitty idle. Switch #1 and #2 injectors, car fires up after clearing the flooded cylinders, runs rough for a couple seconds, evens out, runs perfectly fine again. Eventually it happens again, like 500+ miles later.
SO! My question is: what do you think the issue is here?
Should I replace my fuel rail with another from a junkyard twin cam?
Should I buy new injectors? ($$$, very expensive so I want to avoid dumping money there when mine still work)
How do I clean my injectors? Keep in mind, these are the same injectors that were powering my last twin cam when it committed suicide, and I've never cleaned them because I don't know how.
How can I make the injector 'seat' better in the rail? When I pry the injector out, you can see and hear it decompress, and its a bitch to remove, so I know the outer o-ring is good. Any way I could replace the inside o-ring or something?
Any and all help is graciously accepted, I just want to fix this for good and not have to worry about it again.
I can answer any questions you guys have, and I'll add information as I think of it or as it comes to me.
Thanks again!
I had this problem with my last twin cam, and this is the second time I've had this same issue with the newly rebuilt motor, with only 1300 miles on the odo. The #2 injector won't 'seat' correctly, and, therefore, the motor will only run on 3 cylinders. I know this is absolutely terrible for the motor, it must put a lot of unnecessary strain on a lot of parts, so I always aim to fix it asap.
Seeing as this is becoming a common occurrence , I've come to a couple conclusions already:
1) The wiring harness/ECU is fully functioning, I used a diode to test, and all 4 injectors are receiving power correctly.
2) I have spark on all 4 plugs.
3) Compression is 190 across the board, perfect.
4) All 4 injectors DO fire correctly.
So, to provide basic information: car is a 1990 coupe, harness is 93 twin cam, engine is 96 KA24DE. Last motor was a 93 KA24DE, and I'm re-using the fuel rail from that engine.
So here's what happens: driving fine, all of a sudden, huge drop in power, car smells like gas, exhaust sounds like a boxer motor. Pull over, pull #2 spark plug boot, no change in shitty idle. Switch #1 and #2 injectors, car fires up after clearing the flooded cylinders, runs rough for a couple seconds, evens out, runs perfectly fine again. Eventually it happens again, like 500+ miles later.
SO! My question is: what do you think the issue is here?
Should I replace my fuel rail with another from a junkyard twin cam?
Should I buy new injectors? ($$$, very expensive so I want to avoid dumping money there when mine still work)
How do I clean my injectors? Keep in mind, these are the same injectors that were powering my last twin cam when it committed suicide, and I've never cleaned them because I don't know how.
How can I make the injector 'seat' better in the rail? When I pry the injector out, you can see and hear it decompress, and its a bitch to remove, so I know the outer o-ring is good. Any way I could replace the inside o-ring or something?
Any and all help is graciously accepted, I just want to fix this for good and not have to worry about it again.
I can answer any questions you guys have, and I'll add information as I think of it or as it comes to me.
Thanks again!