Fuel injector codes...

[ericem]

Hey guys every so often when I start my car in -10C or so it will start up nice and quick, BUT when I let it idle for 5 seconds it will start spuddering and die. I checked the codes and I am getting injector 1-4. Also my fuel economy is REALLY bad. 220km to 55L or so. Swap injectors out ? Or another issue?

[Legacy777]

Can you give a little more info on the car. Is it stock, any mods, if so, what mods?

If I had to take a wild guess, I may lean towards coolant temp sensor.

[ericem]

Hmm, its all stock now other then a 3" DP and I dented up my o2 sensor. Today had no problems. My fuel trims are a bit all over the place. Forgot to swap my o2 sensor. Will do so tomorrow.

[ericem]

Did it again today it studders and just shuts off. Other day it studdered and just iddled rough for a bit but didn't die. I haven't gotten around to replacing the o2 and keep forgettng to plug in my laptop and monitor the injector pulse and such.

[ericem]

Unplugged the o2 sensor car runs much better. Still does the same thing in the morning. If it matters the battery light comes on, and I hear the fuel pump relay buzzing then the fuel pump sounds like it shut off almost or maybe it was off for a bit which is why it dies? Then it goes tick tick and I hear the fuel pump come back on and I can restart. I tried 2 fuel pump relays and got the same thing.

[brweber352]

I would definately try to get the O2 done first, should help alot with the fuel trims. When you start having problems after cold weather this usually points to a bad ECT, mine has done this without throwing a code and gas mileage fell down to about 16mpg. Cold weather will also expose a weak battery, you should check all connections and have the battery tested, a weak/failing battery will cause all sorts of problems. More than likely a new O2 and ECT will fix your problems, the OE ECT only costs like $20 so it's a fairly cheap check. Cleaning the MAF should also help with fuel trims if you haven't cleaned it in awhile. Are you running the Revtronix chip? Definately get your Batt/charging system checked out and you might want to check the fuel pump harness under the rear seat, you may not be getting the proper voltage to the pump. I'll probably repeat myself for the 3rd time but if it was my car I would, Check the charging system, replace the O2 sensor, install a NEW OE ECT, reset ECU, and go from there.

Brian

[ericem]

i replaced the coolant temp sensor with oem and have a working 02 to try but didnt reset the ecu yet.