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 Post subject: Idle issues
PostPosted: Sat Nov 21, 2015 8:36 pm 
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Joined: Fri Dec 05, 2014 11:23 pm
Posts: 143
Location: SK
I recently picked up a new project, a 91 vert with a t3 swap. I am having some idle troubles. Currently i have the idle adjustment screw all the way in and it idles around 1600 when warm. If i open it even a little bit the idle raises and starts to surges about 300 rpm. Another thing I noticed is that the car will continue to run if i disconnect the intercooler at the throttle body. It seems to be low on power about 4000rpm but that may be because I never drove a stock t3, my first one I immedialy swapped in a big cam :twisted:

Here's what I've checked

-i replaced the distributor, wires and plugs.
-burping the coolant
-the throttle is not caught and being left open a smidge
-vacuum leaks. Originally the VSV had a broken nipple where it leads to the canister. I disconnected the VSV from the manifold and plugged the nipple. This didn't seem to make a difference. The other vacuum lines appear to be fine. On a side note, what does the VSV actually do? On my previous modified t3 I removed it and used the nipple on the manifold for the bov.

I'm thinking that I may need to replace the IAC unit. I will do that tomorrow regardless, however any help and suggestions is greatly appreciated


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 Post subject: Re: Idle issues
PostPosted: Sun Nov 22, 2015 1:12 am 
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Joined: Tue Jul 03, 2012 12:19 pm
Posts: 344
Location: vancouver island, canada
one thing i know. is if you disconnect any part of the intake system after the AFM then it will die. if yours does not then thats where i would start. the airflow meter. because its apparent its not reading correct.

_________________
92 geo metro 1.0L 5 spd. 2 dr Soon to be my turbo swap car. (Dragonfly) sold
91 pontiac firefly, 1.0L 2dr auto. stock. (The crap can) sold
91 chevy sprint. 1.0L 5 spd. My first turbo swap. (Red rocket) now the purple nurple
95 geo metro. 1.3L auto parts car. (Scrap)
91 chevy sprint turbo, blueboy keeping it "stock"


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 Post subject: Re: Idle issues
PostPosted: Sun Nov 22, 2015 4:21 pm 
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Joined: Fri Dec 05, 2014 11:23 pm
Posts: 143
Location: SK
The airflow meter appears to be okay. No engine light, if I unplug the sensor the engine stalls. Today I replaced the tps and iac, as well the grounds for the back of the intake were in the same spot. But still having the exact same problems.

On the vsv, the lower nipple is broken off, so it is just venting to the air instead of the canister. Could this be causing issues?


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 Post subject: Re: Idle issues
PostPosted: Sun Nov 22, 2015 6:05 pm 
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Joined: Fri Dec 05, 2014 11:23 pm
Posts: 143
Location: SK
I hooked up my modified toyota air flow sensor. It is a toyota celica housing I believe,with the oem guts swapped inside. It idle at a normal rpm however ran rough as the spring was tuned for 50% larger injectors from my previous project. So I am thinking I need to swap the guts into my oem housing and retune the spring. Unfortunately the original position of the spring is not marked so i will have to eyeball it to my faulty sensor.

The check engine light started coming on sporatically as I was tinkering today. Codes 21, 22, 31, 33, and 42 were all see at different times.


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