Someone familiar with FDs in San Diego - Need Help.
Thread Starter
Joined: Apr 2007
Posts: 900
Likes: 8
From: Fort Walton Beach, FL
Someone familiar with FDs in San Diego - Need Help.
So here's my problem, taken straight from my thread in the 3rd Gen Tech https://www.rx7club.com/3rd-generation-specific-1993-2002-16/removed-reinstalled-uim-now-hard-start-idle-957809/
--
Two nights ago I removed my UIM to replace the Throttlebody Coolant Hose that goes from the Rear Iron to the Throttlebody as well as the coolant hose underneath the throttlebody.
After a relatively easy swap, I checked to make sure everything was secure and proceeded to reinstall the UIM. After I thought I was finished, I started the car and it ran like ***. The idle was unstable, showed low vacuum, and didn't rev properly. Assuming I messed up somewhere, I removed the UIM a second time to check for Vacuum leaks and what not.
After replacing a few questionable hoses, I reinstalled the manifold again and started the car. Again it was hard to start, idled even worse, and pulled the same amount of vacuum (25mmHg according to PFC) The throttle needs to be depressed for the car to come on, it will sometimes idle by itself, but not for long. I put my hand infront of the TB elbow (intercooler not connected) and it does pull vacuum but it just doesn't sound good. Motor shakes and vibrates when you rev it.
I have spent two days troubleshooting and searching the forums for keywords such as vacuum leak, leaks, vacuum, idle, starting, UIM, throttlebody and I am still stumped.
I have checked every vacuum hose in plain sight (yes the MAP hose is connected). All bad or even marginally questionable hoses have been replaced with Baker Precision Silicone hose.
The car ran flawlessly before I took the UIM off, I just wanted to replace the throttlebody coolant line because it looked sketchy and I figured it would be a safe thing to do... =/
Mods (though I dont think it should matter):
1993 FD3S Base
APEXi PFC
BNR Stage 3 Twin Turbo - Sequential
GReddy Profec Type S
M2 Med Intercooler
GReddy Throttlebody Elbow
RB Catback
I usually don't resort to starting my own thread, but I am stumped. Can someone help me out? Possible connectors I forgot to hook up, sensors to test, hoses I forgot to connect?
btw, all sensors check out properly on the PFC commander, nothing is out of spec. Spark plugs shouldn't be fouled, they were replaced about 500 miles ago. Fuel Filter replaced 300 miles ago.
My references for this whole project:
http://www.rx7.org/Robinette/manifold.htm
http://www.rx7.org/Robinette/hoses.htm--
I've been on it for a few days, I have a thread up in the 3rd gen forums, but I figure it might be better if someone more experienced came over and helped me out. So if anyone who is familiar with the FD, specifically the UIM/LIM/TB/Rats nest, and feels like helping a brother out, it would be greatly appreciated. I'll buy you lunch/dinner whatever time it is when we finish/give up, successful or not.
--
Two nights ago I removed my UIM to replace the Throttlebody Coolant Hose that goes from the Rear Iron to the Throttlebody as well as the coolant hose underneath the throttlebody.
After a relatively easy swap, I checked to make sure everything was secure and proceeded to reinstall the UIM. After I thought I was finished, I started the car and it ran like ***. The idle was unstable, showed low vacuum, and didn't rev properly. Assuming I messed up somewhere, I removed the UIM a second time to check for Vacuum leaks and what not.
After replacing a few questionable hoses, I reinstalled the manifold again and started the car. Again it was hard to start, idled even worse, and pulled the same amount of vacuum (25mmHg according to PFC) The throttle needs to be depressed for the car to come on, it will sometimes idle by itself, but not for long. I put my hand infront of the TB elbow (intercooler not connected) and it does pull vacuum but it just doesn't sound good. Motor shakes and vibrates when you rev it.
I have spent two days troubleshooting and searching the forums for keywords such as vacuum leak, leaks, vacuum, idle, starting, UIM, throttlebody and I am still stumped.
I have checked every vacuum hose in plain sight (yes the MAP hose is connected). All bad or even marginally questionable hoses have been replaced with Baker Precision Silicone hose.
The car ran flawlessly before I took the UIM off, I just wanted to replace the throttlebody coolant line because it looked sketchy and I figured it would be a safe thing to do... =/
Mods (though I dont think it should matter):
1993 FD3S Base
APEXi PFC
BNR Stage 3 Twin Turbo - Sequential
GReddy Profec Type S
M2 Med Intercooler
GReddy Throttlebody Elbow
RB Catback
I usually don't resort to starting my own thread, but I am stumped. Can someone help me out? Possible connectors I forgot to hook up, sensors to test, hoses I forgot to connect?
btw, all sensors check out properly on the PFC commander, nothing is out of spec. Spark plugs shouldn't be fouled, they were replaced about 500 miles ago. Fuel Filter replaced 300 miles ago.
My references for this whole project:
http://www.rx7.org/Robinette/manifold.htm
http://www.rx7.org/Robinette/hoses.htm
I've been on it for a few days, I have a thread up in the 3rd gen forums, but I figure it might be better if someone more experienced came over and helped me out. So if anyone who is familiar with the FD, specifically the UIM/LIM/TB/Rats nest, and feels like helping a brother out, it would be greatly appreciated. I'll buy you lunch/dinner whatever time it is when we finish/give up, successful or not.
I need work on the exact same thing I am located in El Cajon. I can help with your car but I am limited on the knowledge of this car too.
Will pay money and get lunch and stuff.
Will pay money and get lunch and stuff.
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Thread Starter
Joined: Apr 2007
Posts: 900
Likes: 8
From: Fort Walton Beach, FL
Thread Starter
Joined: Apr 2007
Posts: 900
Likes: 8
From: Fort Walton Beach, FL