new to this forum. here is the story, my sis drives with no oil and blows motor (97 lx,5speed) so i put a motor for my buddies shop in. drives fine but had a idle problem that ive read about. idle bounced from 1-2k, this eventually fixed itself as i read this adaptive learning ecu would. now new problem, idle is so low when u first start it will shut off immerdiately. u have to step on the gas to start it and hold pedal down until the car warms a bit or it will not idle. as soon as its warm it idles fine, ive checked the timing with a light and even switched iacv from her old motor. i have a p0123 for tp and a p1122 air fuel metering code. i read a little how the coolant can affect some of these sensors, any help would be appreciated.

 

So did you replace the original blown D16Y7 engine with the same engine?

Retrieve the CEL codes from the ECU using the jumper wire method described at the link in my signature. Then reset the ECU, run the car and, if the CEL returns, again retrieve the codes. Post repeated codes if you want more feedback.

 

I would check the EIC(electronic air control). When I did my last motor swap i had the same issue.

 

By the way, both of these CEL codes indicate a problem with the throttle position sensor (TPS) circuit. This sensor is located on the throttle body.

 

TPS huh? Yeah, that would do it.

 

sea foam

 

ok so ive reset my sis' car and same day engine light comes back on. i scanned it and same codes p0123 TPS a circuit high imput and p1122 manuf. control A/F metering. im sure this replacement motor is the same only because i knew the car it came out of. i still have the old motor and was thinkin i might put her old t/p sensor on it, but im wondering if it will need to be set or programmed some way? thanks

 

If you swap the TPS, it must be recalibrated (0.5V closed throttle, 4.5V WOT).

This info may also help:

 

^+1 on TPS recalibration
just helped a guy on a very similar idle problem who changed his TPS too

 

Swap the whole throttle body (with TPS still factory attached by the tamper-resistant screws) off of the blown engine. Then you won't have to recalibrate it.

Also in some cases the TPS and the MAP sensor have the same kind of plug, and you can switch the plugs so they are connected to the harness wrong. I don't know what happens when you do that but I'm sure it won't run well.