05 645ci, no start issue (sometimes)

[Mlanuto]

2005 645ci with 145,000 miles. Yesterday was the first time that i've owned this car where I've had trouble starting. it started right up in the morning after sitting for a few days like it normally does. when I went to go restart it after being on for about 15-20 minutes it wouldn't start, crank but no start. I put the key in the 2 position for a few seconds and after some hesitation it started very rough, but after a few seconds it idled ok.

This morning, same thing. Starts right up, but to try and diagnose the issue I turned it off after about 5 minutes and went to restart. same thing as yesterday, it cranks but won't start and when it finally does its rough. When it has trouble starting and is cranking for a longer than normal i can smell gas. Starter seems to be strong, but the battery is about 3 years old.

I took videos if the first start up and second to show the issue, but they're too large to upload

My initial thoughts were possibly fuel pump, but think that would present issues on the first start. Then I thought possibly battery as its pretty old now. I have read about similar symptoms with a failing ivm module?

I am getting codes:
P0128 - Indicates that the thermostat monitor has not achieved the required engine operating temperature within a specified amount of time after starting the engine.
P1126 - is defined as Throttle Control Motor Relay Circuit Open

I replaced the thermostat and water pump about 2 years ago.

Any advice and thoughts are much appreciated.

[jclausen]

I would look into the ivm module it's a small module in the engine compartment with fuses in it

[Niheem]

did u figure out the problem

[Niheem]

So what was it