Hey CB7tuner.com , I have been lurking around this forum for a little bit of time. I first off want to thank everyone that has put up good information here which has helped me out a lot over my time of owning my cb7 .
Now onto the problem; a little background on the car. It has a H22a swap in it with a Euro R IM, attached is an S2k Throttle body connected to it. The engine is turbocharged. I have been troubleshooting a common idle problem where it fluctuates from roughly 800rpm to 1500 rpm. I found a great piece here going through the troubleshooting for it.
What I have already done, was take off the IACV, and cleaned it out. Made sure that coolant can flow through it also. After reattaching it upon first start up the car ran great and the fluctuations were barely noticeable. It bounced maybe at most from 800rpm to 1000rpm. The next day I started her up again and the fluctuations were back. My next move was to check the FITV and see if that is the issue. Well, it appears that the FITV is blocked off. I then was wondering where the coolant line from the IACV was going to. Following the lower IACV coolant line it is connected to the lower / closer part of the Thermostat housing to the engine. This is where I am wondering if it is ok. I read that blocking off the FITV it will only increase the time it takes to warm up the engine in a cold climate (In Connecticut, I would say it is a cold climate now). If this is wrong info please correct me.
IACV - check
FITV - non-existent
Air boost valve - not sure where to find it on the IM, however checked all lines from the IM and lines are connected with no leaks. Will be going over these again though.
Checking for vacuum leaks - yes, but will again double check this too. On a side note, I am not losing any boost pressure when running the car. Not that it is the best way to tell, but the boost gauge is not spiking or dipping once I am in boost.
Idle Screw - have not attempted yet
Coolant system bleed - Did this first with a cold engine, then realized that the engine needs to be at temp for coolant to run through the entire engine, so did it again when it was at temp.
The big thing that I notice while the idle Fluctuates is that my Wideband goes from a 12.6 to as high as a 16.0 then dips under 11.5 and up again to 15.5. I am also thinking that the ECU might be the issue, but want to get the mechanical side of troubleshooting finished before I look at the ECU as the problem. I have to double check, but I believe it is either a p72 or p28, it is running a Hondata S100.
Any feedback or help or direction is extremely appreciated. Thanks everyone
Now onto the problem; a little background on the car. It has a H22a swap in it with a Euro R IM, attached is an S2k Throttle body connected to it. The engine is turbocharged. I have been troubleshooting a common idle problem where it fluctuates from roughly 800rpm to 1500 rpm. I found a great piece here going through the troubleshooting for it.
What I have already done, was take off the IACV, and cleaned it out. Made sure that coolant can flow through it also. After reattaching it upon first start up the car ran great and the fluctuations were barely noticeable. It bounced maybe at most from 800rpm to 1000rpm. The next day I started her up again and the fluctuations were back. My next move was to check the FITV and see if that is the issue. Well, it appears that the FITV is blocked off. I then was wondering where the coolant line from the IACV was going to. Following the lower IACV coolant line it is connected to the lower / closer part of the Thermostat housing to the engine. This is where I am wondering if it is ok. I read that blocking off the FITV it will only increase the time it takes to warm up the engine in a cold climate (In Connecticut, I would say it is a cold climate now). If this is wrong info please correct me.
Originally posted by cloudasc
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FITV - non-existent
Air boost valve - not sure where to find it on the IM, however checked all lines from the IM and lines are connected with no leaks. Will be going over these again though.
Checking for vacuum leaks - yes, but will again double check this too. On a side note, I am not losing any boost pressure when running the car. Not that it is the best way to tell, but the boost gauge is not spiking or dipping once I am in boost.
Idle Screw - have not attempted yet
Coolant system bleed - Did this first with a cold engine, then realized that the engine needs to be at temp for coolant to run through the entire engine, so did it again when it was at temp.
The big thing that I notice while the idle Fluctuates is that my Wideband goes from a 12.6 to as high as a 16.0 then dips under 11.5 and up again to 15.5. I am also thinking that the ECU might be the issue, but want to get the mechanical side of troubleshooting finished before I look at the ECU as the problem. I have to double check, but I believe it is either a p72 or p28, it is running a Hondata S100.
Any feedback or help or direction is extremely appreciated. Thanks everyone
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