Car runs rough...

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Feb 18, 2007, 04:09 PM

#16

riceball777

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map is manifold absolute presure

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Feb 18, 2007, 04:13 PM

#17

riceball777

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Quote:

Originally Posted by Evo442

My VIII has done this for as long as I can remember. Stalls like that too if the rpms drop too much. Was worse with an aftermarket BOV, so I went back to stock. Also happens when I put the car under load (ie. accelerate) from a stop/near stop and then suddenly put the clutch back in...

ie being at a stop on a hill, launching the car forward a bit, and then putting the clutch back in - rev's will drop, sometimes the car will stall. Some evos do this worse than others, I've been told its pretty normal.

If anyone finds a definitive answer, I'd like to know it!

mine does the exact samer thing. and its a lot wore if the ac is on.
if i acceperatea little and put the clutch back in right away the car will get pig ritch and stall. does this even worse when its on a hill. i think it has something to do with running an after market intake and with the maf. i have an hks intake btw.

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Feb 18, 2007, 04:17 PM

#18

DRFTKNGG

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^^^^because BOV opens and vents metered air out...

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Feb 18, 2007, 04:35 PM

#19

xmaciek82x

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Quote:

Originally Posted by Spikedlee

I've got the same exact mods as you and after I had the K & N put in the car ran like **** until I got it tuned recently. The boost wasn't holding, the power was horrible, etc. After the tune it ran perfectly and was very smooth. I say get a tune.

You get a base tune or a custom one? I was going to go with the AMS base one hopeing that will fix the problem.

I don't want to do a custom tune just yet, I will wait till I do more things with the car first.

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Feb 18, 2007, 07:18 PM

#20

3SgteGuru

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Quote:

Originally Posted by xmaciek82x

Well I can't take it to the dealer because this happens maybe once a week... I won't be able to simulate the problem once I'm there.

Thanks for all the ideas guys.

sounds more along the lines of your knock sensor, its normal for the evo to experience this from loud noises at the right frequency. It tricks the ECU into thinking the motor is knocking.

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Feb 18, 2007, 07:19 PM

#21

3SgteGuru

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Quote:

Originally Posted by riceball777

map is manifold absolute presure

yes you are right, I got that wrong. Lol I put mass air pressure.

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Feb 18, 2007, 07:20 PM

#22

Z-Ball

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uh oh mine does this sometimes too...

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Feb 18, 2007, 08:04 PM

#23

binh

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Shameless plug but I'm selling a MAF from my Evo IX if you decide you need one. It has 12k miles on it. I took it out because I switched to AEM EMS. PM me if needed.