High Idle on new rebuild

[Guilty1s]

OK... fresh 0 mile rebuild. On start up, it idles around 2000-2500 rpm.

But there are a lot of factors that could have caused this. Since that car has last ran. I have
AWD swap
5 speed swap
New 100% motor rebuild
Magnus SMIM install
272 cams installed
1G Turbo TB swap
Interior swap
Mild wiring tuck with many connectors extended
16G install



What troubleshooting i have done:

The ISC motor checked out... i check resistance between 1-2, 2-3 ,4-5, 5-6 all around 27ohms. (brown isc) Does it matter if i use black or brown. I have both black and brown.

TPS sensor has been set to 0. it was at 11% now at 0. No difference

When MAF is unplugged the idle drop a bit, but runs very rough. I don’t have a MDP connected to the vacuum source as i since installed the SMIM so the failsafe pseudo SD won’t work. I have also swapped MAFs just in case. No change.

The coolant temp sensor shows a normal temp 69 degrees on a cold engine. I used a OBD2 code reader with data logging to see this value.

I must be the most hypocritical person here, as i have not done a BLT.. can’t find my tester... but that is usually my first reply to most peoples running problems. I have all new gaskets. Not saying i don’t have any boost leaks, but none certainly large enough to idle this high.

BISS screw doesn’t change anything worth mentioning.


Some things that may play a factor:

I am 98% sure i did all the wiring correctly.. its hard to get it wrong. But my gut is telling me that the only i can think could be left is a miss wired ISC

I don’t have my good exhaust since my AWD swap, so i am running an open DP that doesn’t have provisions for a rear O2... I’m not even sure if its plugged in or just sitting in the open air, but as far as i know, the rear O2 should effect any engine control anyways

I do not have any kind of FIAV delete or modifications

I haven’t ran it long enough to get warm.... um.. idk

Obviously with a SMIM, i have done emission and evap delete. All the sensors are connected(wires) but not connected to any vacuums. I am showing code for EVAP purge control valve circuit.

I am on stock ecu/tune. Stock injectors too. ECMlink V3 is scheduled to be delivered tomorrow via UPS They have the greatest customer service and turnaround. Will i be able to troubleshoot anything else when i get it.

 

[92AWDHX40]

Terry's Talon Troubleshooting Tips #3 - Fast Idle (aka. Idle Surge)

start here.

 

[Guilty1s]

My next steps of action is to fiqure out a way to check FIAv.... then check it

Check for front 02 sensor cycling.

 

[sleeperawd92]

i would think it is the fiav. when i rebuilt my 1g it would idle at 3k until it reached operating temp. does the idle drop once it reaches its operating temperature??

 

[BoostedBen]

Vacuum leak is the most likely source if your ISC and TPS are within spec.

Time to bust out the boost leak tester.

 

[92AWDHX40]

blt.

 

[cpoindexter]

I would agree with the above and do a blt. Once you for sure know that you dont have any leaks, then you can begin to further inspect the electronic parts such as the FIAC and all.

 

[Guilty1s]

blt is going to done tomorrow

Anyway way to confirm a bad FIAV?

i would think it is the fiav. when i rebuilt my 1g it would idle at 3k until it reached operating temp. does the idle drop once it reaches its operating temperature??

and i havent gotten it to operating temp yet

Update: Fixed... i replaced the FIAV and the ISC... idle good now. Thank you.