Engine almost dies on start up....then..
Thread Starter
Honda-Tech Member
Joined: Sep 2009
Posts: 291
Likes: 0
From: San Jose!
Engine almost dies on start up....then..
I searched tons and tons on Google and here. Similar problems but not exactly my problem.
When I first start up my car it sits at like 300rpms and comes close to dying. After my car warms up it's all good. It's like it's missing that first initial rev up to 1200 to 1500 rpms and then settling down to 700rpm. I get about 25 MPG, mild black smoke out my exhaust. I burn about 3/4 of qt of oil every 500 miles. My engine has about 6000 miles on the rebuild. My car runs awesome after it's warm and going.
Here's what I have:
1994 GSR ITR Cams, ITR Pistons, ITR(Chipped P72) Ecu, Skunk mani, Full exhaust. EG6 intake.
Here's what I've done so far to fix the problem:
New IAVC
Reset my ECU
Checked for Vacuum leaks.
Here's what I plan on doing:
Changing spark plugs and wires
Clean my throttle body
Possibly buying a new ECU
Possibly new distributor
Taking it to a shop when I find one if I can't fix the problem.
All suggestions are appreciated. Please no negative comments.
When I first start up my car it sits at like 300rpms and comes close to dying. After my car warms up it's all good. It's like it's missing that first initial rev up to 1200 to 1500 rpms and then settling down to 700rpm. I get about 25 MPG, mild black smoke out my exhaust. I burn about 3/4 of qt of oil every 500 miles. My engine has about 6000 miles on the rebuild. My car runs awesome after it's warm and going.
Here's what I have:
1994 GSR ITR Cams, ITR Pistons, ITR(Chipped P72) Ecu, Skunk mani, Full exhaust. EG6 intake.
Here's what I've done so far to fix the problem:
New IAVC
Reset my ECU
Checked for Vacuum leaks.
Here's what I plan on doing:
Changing spark plugs and wires
Clean my throttle body
Possibly buying a new ECU
Possibly new distributor
Taking it to a shop when I find one if I can't fix the problem.
All suggestions are appreciated. Please no negative comments.
Honda-Tech Member
Joined: Dec 2007
Posts: 159
Likes: 1
From: Norco, CA, USA
Re: Engine almost dies on start up....then..
The Fast Idle Thermo Valve (FITV) on the bottom of the throttle body is what adds air on cold starts to get it to idle higher. As the engine builds temperature, the coolant that pumps through the FITV warms which causes it to stop adding extra air and the engine idles down to normal.
Most if not all aftermarket throttle bodies eliminate the FITV in an effort to keep the throttle body cooler after the engine reaches operating temperature as this generates more horsepower. The downside is you have to give the engine some throttle on cold starts until it builds enough temperature to idle on its own.
If you are running an aftermarket throttle body that eliminates or bypasses the FITV this is surely why your idle is doing this. If you are running an OEM throttle body make sure the coolant lines are connected to it.
If you ARE running an OEM throttle body and the coolant lines ARE connected correctly, you may have a fautly FITV.
Most if not all aftermarket throttle bodies eliminate the FITV in an effort to keep the throttle body cooler after the engine reaches operating temperature as this generates more horsepower. The downside is you have to give the engine some throttle on cold starts until it builds enough temperature to idle on its own.
If you are running an aftermarket throttle body that eliminates or bypasses the FITV this is surely why your idle is doing this. If you are running an OEM throttle body make sure the coolant lines are connected to it.
If you ARE running an OEM throttle body and the coolant lines ARE connected correctly, you may have a fautly FITV.
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