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Idle And Revving Starts Splatting At Running Temp

BaileyH

By BaileyH,
in Engines & Forced Induction

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BaileyH Apprentice

BaileyH

Posted
Posted

Okay. I have a r33 4 door sedan.
My car has this problem, its very hard to explain so bare with me.

When the car is cold, it runs smooth and the car feels normal.
But when the car gets warm, it feels like it looses power.
When the car is cool, i can rev it and it will rev freely like it should.
But when it gets warm, ill put my foot on the accelerator slowly and coughs and farts a little bit and it will stop at about 2k rpm.. while my foot is still going down slowly the revs stay at 2k rpm, and then will SOMETIMES all of a sudden just rev through it OR if i get my foot to the ground, it will start revving between 1k and 2k rpm.. just back and forth.
So all this is usually when i get the temperature around 70 C. If it falls under 70 C, it will not do it.. so i know its heat related.
But when you get it warm, you can still get it past it, only if you put your foot straight to the ground and not slowly.

Now the ignitor gets quite hot..
When its warm, and im trying to rev it.. the lights are dimming and brightening like they are not getting enough power, like headlights, tail lights, dash lights, cluster, every light is dimming and brightening.
Ive checked the coilpacks, its surely not them.
It would not be the injectors, because they do not act different upon heat do they? and it floods when hot if i keep my foot down when its doing the revving between 1 and 2krpm.
It has a MAFless tune, so does not use a AFM.

Has anyone ever had this problem?
Its such a confusing thing to try and diagnose.

BaileyH Apprentice

BaileyH

Posted
  • Author
Posted

Its a wolf 3d one. The ecu has no errors.

It got worse and ran on 5 cylinders, and it sounded like a subaru, so we replaced the ignitor loom, ignitor, rechecked all the coilpacks and injectors AGAIN.

It fixed the subaru problem, but still when she gets warm it acts the way I described it in the post.

Only thing we have now is to replace the alternator, and check the coolant temperaure sensor..

Otherwise im out of ideas.

GTRPSI Mentor

GTRPSI

Posted
Posted

Have a look at all your earth connetions and clean them.

Resistance happens more so with heat, you mentioned things are dimming as it warms up.

Bit of sandpaper on all the eath leads should be a easy test/check.

In my case i ran a home made earth kit, basically some wires direct from the Negative to around the block, one of the ignitor models bolts, cleaned the big earth to the block...etc

Sometimes its something simple.....does not mean its not your ignitor though, or even your CAS, test with known working ones after the earth check.

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