gregs22

iTrader: (12)

concern seems to only happen when engine is cold it is very difficult to start and once its started the idle is very rough and necessary to assist by holding the gas pedal, i also noticed the factory tach is very slow to repsond once the car is running...any help would be appreciated

thanks

Mahjik

iTrader: (1)

If you have those codes, the car is going to run like crap:

9 Water thermosensor
11 Intake air thermosensor (engine)

What's the history? Did you just put a new engine in? Did the car just start having this problem out of the blue?

The water thermosensor is on the back side of the water pump housing (top sensor). The intake air thermosensor is under the UIM. Have you verified the sensors are connected?

gregs22

iTrader: (12)

sensor does appear to be connected..no recent engine replacement concern just happened out of the blue...someone told me i may need a ecu does this sound like a valid recommendation?

thanks for the help....

Mahjik

iTrader: (1)

Seems more like you have an issue with your emissions harness. Unplug and reattach the plugs for both sensors. Then clear the ECU codes by disconnecting the negative terminal on the battery for 30 seconds. After that, start the car and see what happens. See if you get the same codes again.

gregs22

iTrader: (12)

i did try disconnecting the battery and noticed the codes return meaning hard fault correct? i also had a coolant sensor laying around for my older toyota truck and connected it.. started rite up...now as soon as a plug in the original coolant sensor it will not start anymore...

Sgtblue

iTrader: (16)

Then replace both sensors. Not sure about the water thermosensor, but a bad IAT will make the car run really rich. I don't think either are particularly expensive...maybe $50 each. And unless there's something else going on that you haven't mentioned, don't listen to whoever recommended replacing the ECU.

gregs22

iTrader: (12)

i appreciate the help.. its makes sense to start off with the sensors

gregs22

iTrader: (12)

just want to let you guys know car is fixed finally...it was a coolant temperature sensor
thanks for all the help!

Sgtblue

iTrader: (16)

Just the thermosensor? What about the IAT?

gregs22

iTrader: (12)

didnt replace the IAT just the thermosensor. i figured i would start with the thermosensor and go from there and it drives and starts really good now

Sgtblue

iTrader: (16)

Well good luck with that. Maybe it was just a transient code...maybe. But IIRC when my IAT started failing I was able to clear the code once or twice, but it eventually came back.

If you do have to eventually replace it, consider re-locating it upstream from the T-body. It's not complicated and probably much safer but it does have a little downside in cooler weather with the stock ECU. Do a search for more info. Again, glad you got it up and going.

gregs22

iTrader: (12)

thanks for the info..ill continue to put miles on the car just to make sure everything is going to be ok..ill keep you posted if anything changes..again thanks for the all the help and ill read up on re-locating the sensor