Got some codes but not sure whats wrong...

[jkichline]

My CEL came on a couple times in the past couple weeks but went out after driving for a minute. I just checked the codes and got a few... here goes...

KOEO - 15 // stored codes - 66, 95
15 - No Keep alive memory (have always had this one...)
66 - MAF sensor signal low
95 - Fuel Pump: Open, bad ground or always on

KOER - 21, 77
21 - Engine Coolant Temperature sensor out of range
77 - System did not receive goose test

Cylinder balance - 9
9 - All cylinders are OK.

I clean my MAF Sensor every couple months but never had this code before. My fuel pump seems to be working OK. I replaced it about a year ago. I'm not sure about the ECT sensor. I guess that could be a problem...

Which codes should I be concentrating on?

 

[93rev2sev]

What are your symptoms?

 

[jkichline]

The idle was a little erratic (felt like a vacuum leak type of thing) at first but then settled out, otherwise it seems to run and drive fine.

I've had the car now for 3 years and it has always started kind of funny. Sometimes it won't start unless I press the gas pedal all the way down while cranking. I replaced the TPS and got NO change.

I'm thinking maybe the ECT sensor is messed up and trying to start the car with a bad fuel mixture or something like that.

I cleaned the MAF sensor last night and the CEL has not come on since so I may have resolved that one.

 

[93rev2sev]

I'd be cleaning the IAB valve. It hangs off the back of the throttle body and is cylindrical. If that get's gummed up, it might take a while for it to react during startup.

Usually, this involves removing the valve and use a pipe brush with some solvent to clean out all the passages or "nostrils".

 

[Troywakeling]

ECT sensor will cause a hard start as it tells the computer how much fuel to add on a cold start.. Might as well replace it as its like $20 and easy to do, I did mine when I did my o2 sensors. I never had one go bad on a SHO but I had one fail on my old Talon and damn that thing was a pain to start. I had to press the pedal to the floor like it had a carb and it still didnt want to start also it ran like ass. It may not be everything but it should make it run and start better if its bad.