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Engine lacks power on cold start

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McFox

15+ Year Contributor
55
0
Jul 25, 2007
Tempe, Arizona
So heres the story:

Driving around late one night and I pull up to a red light. Sitting there I'm thinking "Damn my exhaust sounds really loud." Pull into a parking lot and my exhaust is just hanging there in my engine bay. All 3 bolts that hooked up to the turbo are MIA (The threads are not stripped either). Luckily I was about 2 blocks from home so I took it real easy on her getting it home. Replaced the gasket, got new bolts and added lock washers to the combo.

Now the problem:

Upon firing up from a cold start, if I try to rev it the car will either die or slug down and drop to 100-200rpms. After the car warms up to operating temperature it runs fine. Pulled my codes and got code 42: MFI relay. Went out and checked my ASD and fuel pump relay. Only thing I found was on the relay closest to passenger side of the car (not sure if its the ASD or fuel pump, MTX tranny) one of the wires that fed into had fallen out of its butt connector. Re-connected the wire but to no avail. I'm not really sure if running Megasquirt even effects the MFI/ASD relays. I've replaced the ECT sensor and checked the TPS, which is fine. Anyone know where I should start looking or what to do?

Built bottom end
420a turbo
Megasquirt
Walboro fuel pump
 
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