Evo 8 help.
#1
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Evo 8 help.
Hi, I new to this a new evo owner. I just picked up the car today.
Car has highmiles and the problem I'm having Is with engine stuttering almost stalling when you put accessories on like ac. It will idle rough and spit and sputter revs drop. Turn ac off symptoms go away and engine runs normal.
Could have to do with a idle control valve or something similar?
Any help would be appreciated.
Thanks
Dan
Car has highmiles and the problem I'm having Is with engine stuttering almost stalling when you put accessories on like ac. It will idle rough and spit and sputter revs drop. Turn ac off symptoms go away and engine runs normal.
Could have to do with a idle control valve or something similar?
Any help would be appreciated.
Thanks
Dan
Last edited by imation; Mar 8, 2011 at 06:31 PM.
#3
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#6
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I will check for vacuum leaks to start.
Im going to ask a couple noob questions here please bare with as im new to these cars.
I thought that the evo used a MAP sensor not MAF? There for vacuum leaks should affect the car like on a MAF setup. My skyline uses MAF sensors and runs horribly when you have a vacuum leaks and when it had the same issue it was a icv valve
Is there a valve that controls idle on our cars? Most cars have a control valve that bumps up idle when accessories are turned on and there is extra draw on the engine.
The car ides about 950 rpm then drops between 600-900 with ac or other accessories on. If that helps
Dan
Im going to ask a couple noob questions here please bare with as im new to these cars.
I thought that the evo used a MAP sensor not MAF? There for vacuum leaks should affect the car like on a MAF setup. My skyline uses MAF sensors and runs horribly when you have a vacuum leaks and when it had the same issue it was a icv valve
Is there a valve that controls idle on our cars? Most cars have a control valve that bumps up idle when accessories are turned on and there is extra draw on the engine.
The car ides about 950 rpm then drops between 600-900 with ac or other accessories on. If that helps
Dan
Last edited by imation; Mar 8, 2011 at 07:06 PM.
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#8
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A mechanical or electric sensor or controller not functioning makes more of a sense.
I find too many jump to tuning out the problem instead of finding the broken or malfunctioning part. Do you adjust or raise the idle if you have a vacuum leak to compensate or find the leak?
Dan
#9
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#11
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hi again, long delay. Evo has been on the back burner for the summer.
I'm still haveing same issue runs like crap with ac/lights/heat on.
I replaced the IAC it helped alot now the car just runs badly not turning off.
I replaced most vacuume lines and retightened everything else.
Turns out there was a boost controller and a few other things installed on this car I found a old boost controller line that was going to the wategate.
Any ways has anyone had issues with misfire and rought idle when coil packs/wires are bad?
Just thinking more power being drawn with old coils might not make an efficient spark.
Dan
I'm still haveing same issue runs like crap with ac/lights/heat on.
I replaced the IAC it helped alot now the car just runs badly not turning off.
I replaced most vacuume lines and retightened everything else.
Turns out there was a boost controller and a few other things installed on this car I found a old boost controller line that was going to the wategate.
Any ways has anyone had issues with misfire and rought idle when coil packs/wires are bad?
Just thinking more power being drawn with old coils might not make an efficient spark.
Dan
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