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Missing after a manual conversion

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So every since the conversion if have a miss-fire. It seems to happen in the rev range of 1100-2500.

The car was sitting for a few months during the conversion.

1. Changed the plugs

2. Coil packs are brand new

3. Unplugged coils one by one, nothing seems to change 

4. Sprayed all over vacuum hoses etc with brake cleaner, can't hear anything

5. Vacuum tested when running, looks normal.

6. Unplugged the O2 sensor, no change. ecutalk is seeing voltage. 

I have a consult (ecutalk), but I don't really know what to look for, other than error codes, which there are none.


image0 (1).jpeg

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  • 2 weeks later...

Everything is normal except for your timing. It should not be at 0 while you're idling. When you throttle it, does it move?

Edited by TurboTapin
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The timing is likely at zero because the ECU is (probably) pulling al the timing out to control idle speed, which would imply a problem with the IACV. 875 rpm is too fast for 81°C coolant temp, which tends to support the theory.

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Thanks for the feedback guys.

Yeh, the timing does jump to 15-20, when you take it up past idle. This was taken on idle.

It does have a high idle sometimes. GTSBoy are you saying that IACV is faulty then? Any way to test this?



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On 8/12/2021 at 8:42 PM, elohim_imanu said:

GTSBoy are you saying that IACV is faulty then? Any way to test this?

Yes. It's probably dirty and jammed so that it can't close down far enough. Block off the air pipe that goes to the IACV and see if the idle speed crashes. Otherwise just do the usual clean it out thoroughly thing.

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On 13/08/2021 at 11:35 AM, Dose Pipe Sutututu said:

Are you running the auto ECU? if so, install the manual one.

Yeh, I thought about that. What difference will it make?

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On 13/08/2021 at 12:36 PM, Dose Pipe Sutututu said:

From what I remember the auto maps have additional compensation timing for the car being in gear, etc.


Yes, I do notice that when in gear the idle raises, cause I plumbed up the neutral switch. That is when I feel the miss/vibration the most. Anything else that I should be concerned about? But I am going to clean the IACV.

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