Some months ago, swapped my old 3.1V6 to a 3.4V6 with 40.000mls on it...
Used the 3.4 injectors, put headers on it, add a K&N filter with CAI..
Removed the stock fuel pressure regulator an added a aftermarket FPU and set it to 40PSI
Engine runs GREAT!!!
Stays like that for about 2 months (2000-3000 mls)

2 weeks ago, started to smell fuel...
Looked under the hood, 1 injector (was a little corroded before) was burst open..

Ordered some remanufactered injectors, and installed them.
Installed also a new oxygen sensor (why not)
Engine runs even better than before.....
But a little rich thow

Run it home, and drove back into the garage, hears a plop, and engine stops....
Turns out fuse INJ2 is blown..
Put in another one, blows again.

Tow it to the garage

Since INJ2 feeds the left injector bank, disconnect those 3 injectors, put in a new fuse, and connect them 1 by one, fuse stays OK (pffff)
Start the engine again, runs perfect, but too rich..

Disconnect the battery for the 15min (have heard that reset the ECM), so that it can relearn for the fuel/air ratio

Connect the battery, start the engine, runs fine.
drive a little test run; everything OK
Stop the engine, restart it 15 min later => runs lake crap, stalls
1 hour later => still the same

Disconnect the battery again for 15 min ; after that runs fine
Testrun => OK
Stop the engine, restart=> runs like crap...

Pffff; don't know it anymore
Have anyone an idea what this could be?

grtz, D

 

I'm assuming you kept the stock ECM? If that is the case, you will run rich using 3.4 injectors on a stock tune. Now for the other issues......
Are you getting any codes?
Does it only run like crap at idle or all through the RPMs?
Do you have access to a scan tool to read live data?
What brand are your reman injectors?

 

I kept the stock ECM indeed.
That is also why I installed the aftermarket FPR => When I lower the fuel pressure, it will not run that rich.
The SES light went on, so I sure get codes.
Did not read them thow with the paperclip trick...
I normally read them with my laptop, but it was not at home that time..
When you disconnect the battery, the codes are gone off course...

Read live data is a good idea... Next time I take my laptop with it (If it happens at home off course)

The brand of the injectors is autoline.

 

Yesterday, it wouldn't start again just after I shut if off.
Noticed that the fuel pump was not working when I turned the ignition on.
When I connected the prime-wire to the battery, it zooms nicely (so fuel pump is OK)
Also noticed that not all the lights on the dash were on like they normally do.
Not sure, but its like when you pull the fuse of the ECM....

Is it possible my ECM is toast because of the burned fuse of the fuel injectors?

Took me 1 cup of coffee and it was solved (read => 5 min later it started just fine....)

 

Just as an FYI, the ignition needs to be off for 10 seconds for the fuel pump to prime at key on. Just mentioning that in case you shut the car off and within those 10 seconds tried to listen for fuel pump prime.

If you waited longer than 10 seconds, disregard the above.

 

I just figured it out (I think..)

I normally don't believe in coinsedence, but I believe this time it is....

Yesterday my fuel pump died... (believe it or not.... at the fuel station, .....and just filled it up )
Prime didn't work this time, so I left the car there (it still is...)

When I leave the burned fuse out of the picture, all the symtoms fits a worn fuel pump.

Still have no explanation for the burned fuse, but maybe a resistance test of the injectors will tell me more....