Rough idle and whistle at startup

[Frankenvan]

Technical question: I broke my header and replaced the whole exhaust. The header had to be removed through the top of the engine requiring the air filter to be removed and reinstalled. Now I have a tea kettle like whistle and rough idle when I start the car up. It’s an SPI model. I replaced the vacuum hose on the backside of the throttle body but that didn’t help.

Any suggestions?

Thanks in advance for your assistance,

Mitch

[Frankenvan]

Took the NAPA vacuum hose off and reinstalled the original one. That cleared up the whistling, but I still have a rough cold engine idle.

[Frankenvan]

Ok, purrs like a kitten now. I had some hose leftover from when I rehosed my Cooper that fit perfectly. I couldn’t change the vacuum hose that leads to the bottom of the ECU though because I couldn’t get my hand under there or get the bottom ECU mounting screw off because I couldn’t get at it. Any tips on replacing this hose?

[Frankenvan]

Got it after much trial and error.

[Jerry]

Big hands and small spaces = the joy of mini ownership.