TPS IAC IAT codes on stock D16y7 swap
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TPS IAC IAT codes on stock D16y7 swap
Hey guys.
1998 Honda Civic LX with swapped 2000 Honda Civic D16Y7.
I was driving to work one morning and blew up my D16Y7 with 185,000 miles on it, It was running like **** but had no idle issues.
Fast forward, I have my replacement D16Y7 in and running. The motor I swapped in had the intake manifold still attached to it so I left it on and swapped the throttle body from the blown motor onto it.
Once the car was running, I instantly noticed the dreaded Honda idle surging between 1k and 2k and the idle while driving was at jumping between 1100 and 1500. Once warmed up, While driving the car was doing the damn TPS bucking thing where you cant drive with a steady (or light) throttle. It also bogs and has no power until reaching 3k RPM, then I get my power.
It also was doing something new I have never seen a Honda do before, When I do get a steady throttle that doesn't buck im getting idle surging while driving, It surges between 1500 and 1700 and will bounce up and down like that while driving down the road, again under light throttle.
Im pretty experienced with Honda's so here's what I have done thus far.
Set the timing
Checked vacuum hose routing
Checked engine harness for swapped plugs (Like the MAP and TPS plugs)
Pulled CEL codes and got TPS, IAT, Idle Control System and IAC Valve Circuit Failure.
FICV is functioning properly
Here's my thinking about the codes being thrown, The common denominator is the throttle body, Which was swapped onto the intake manifold already present on the new motor. Could I have such a vacuum leak from the TB that would set off all these codes? All these sensors and ECU were working properly on the old motor.
Im looking for ideas here before I start continuity testing all those damn wires and start pulling the intake side apart.
1998 Honda Civic LX with swapped 2000 Honda Civic D16Y7.
I was driving to work one morning and blew up my D16Y7 with 185,000 miles on it, It was running like **** but had no idle issues.
Fast forward, I have my replacement D16Y7 in and running. The motor I swapped in had the intake manifold still attached to it so I left it on and swapped the throttle body from the blown motor onto it.
Once the car was running, I instantly noticed the dreaded Honda idle surging between 1k and 2k and the idle while driving was at jumping between 1100 and 1500. Once warmed up, While driving the car was doing the damn TPS bucking thing where you cant drive with a steady (or light) throttle. It also bogs and has no power until reaching 3k RPM, then I get my power.
It also was doing something new I have never seen a Honda do before, When I do get a steady throttle that doesn't buck im getting idle surging while driving, It surges between 1500 and 1700 and will bounce up and down like that while driving down the road, again under light throttle.
Im pretty experienced with Honda's so here's what I have done thus far.
Set the timing
Checked vacuum hose routing
Checked engine harness for swapped plugs (Like the MAP and TPS plugs)
Pulled CEL codes and got TPS, IAT, Idle Control System and IAC Valve Circuit Failure.
FICV is functioning properly
Here's my thinking about the codes being thrown, The common denominator is the throttle body, Which was swapped onto the intake manifold already present on the new motor. Could I have such a vacuum leak from the TB that would set off all these codes? All these sensors and ECU were working properly on the old motor.
Im looking for ideas here before I start continuity testing all those damn wires and start pulling the intake side apart.
Last edited by EKJOE; Jun 28, 2011 at 11:01 AM.
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Re: TPS IAC IAT codes on stock D16y7 swap
Hey Did you ever fix the problem because I'm having the same issue, I kind of think I'm not getting power to the iac because when I turn the key the device doesn't shut closed & opposite when its off, but when i cut the wires & then touch them to the battery I get it to do I need it to on the car. So How would I trace this problem down? Any help please
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