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Old 02-28-2019, 06:21 PM   #1
Bosozoku_Volvo
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Default b230f +T wont idle

i built a +T setup for my 240 a while back. lh2.4, yoshifab rods and arais forged pistons, rsi2 cam, stock rebuilt head, some large ebay turbo, s70 white injectors, ipd cam gear, ipd recirc valve.

i chased down all my intake leaks so far, i have a small exhaust leak at the o2 sensor, ive reset the tps a dozen times, and it will not idle in closed loop to save its life. only code i have is an egr code (ecu from an egr car). it doesnt act any different with the o2 unplugged, i can feel the idle motor buzzing (at least last time i checked it did). i found out recently that the ect had a pin pushed out, and after refitting a lot of my problems under boost went away, but it still wont idle.

if it helps to mention, the throttle is violently touchy. a light touch makes the thing buck like crazy. slow speeds are almost impossible like this, and freeways cruising backing off the throttle is obnixious.

bad TPS maybe? idle motor? ill be running through the idle motor and such to make sure it working, but im geting tired of trying to find a similar issue to mine on google, thats always something stupid or easy.
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Old 02-28-2019, 09:46 PM   #2
dl242gt
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If it is LH2.4. You can check for codes. LH2.4 also has a diagnostic mode that you can use to check things like the throttle position switch, idle motor, for example

The engine should idle in all modes cold or hot. So if you are certain there aren't any air leaks. then I would move into testing the idle motor cirucit. Make sure it's got power to the motor and the other wire goes to the ecu.

Have you verified the cam timing is correct? Make sure the engine is mechanically correct first then you can move into the other issues. If the cam timing is off a tooth. You can have symptoms like this.
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Old 03-01-2019, 02:04 PM   #3
Bosozoku_Volvo
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Quote:
Originally Posted by dl242gt View Post
If it is LH2.4. You can check for codes. LH2.4 also has a diagnostic mode that you can use to check things like the throttle position switch, idle motor, for example

The engine should idle in all modes cold or hot. So if you are certain there aren't any air leaks. then I would move into testing the idle motor cirucit. Make sure it's got power to the motor and the other wire goes to the ecu.

Have you verified the cam timing is correct? Make sure the engine is mechanically correct first then you can move into the other issues. If the cam timing is off a tooth. You can have symptoms like this.
i mentioned the only code was for egr, but i havent tried the actual diag mode.

i found the idle motor ohms at 7.9, i have power at the plug, and the motor moves with an external power source, but its not opening with pos2.

and yeah, i checked cam timing a while back, no skipped teeth, clocked for 2.5 ahead i believe. it did this at 0 as well, so im pretty sure thats not a problem.
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Old 03-01-2019, 07:04 PM   #4
dl242gt
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The idle motor is grounded by the ecu to control it. A continuity check may help. You may also want to verify that you haven't swapped the knock sensor with the idle motor connectors. That has happened a few times.
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Old 03-07-2019, 01:54 AM   #5
benknowsbest
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Diagnostic codes/modes

Try mode 2 to test TPS and RPM sensor, mode 3 will run through different components including the IAC. Thats probably the best place to start.
Make sure the TPS is adjusted properly and as mentioned above check you haven't confused the TPS and crank sensor wires, they look exactly the same.
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Old 03-08-2019, 12:49 PM   #6
DMFWallace
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Try an ECU from a non-EGR car.
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