FD RX7 in "limp" mode
#26
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Note: The FPR needs to have connected vacuum "on" to function properly. So check the vacuum lines and the controlling solenoid.
The FPR itself seldom fails, but it does happen. If the vacuum is "off" the FPR closes (at least partially) and this may cause your injectors to flood.
Also the fuel surge damper at the front (back?) of the injector rail has a little rubber plug that can disappear. Need to check that as well.
The FPR itself seldom fails, but it does happen. If the vacuum is "off" the FPR closes (at least partially) and this may cause your injectors to flood.
Also the fuel surge damper at the front (back?) of the injector rail has a little rubber plug that can disappear. Need to check that as well.
Last edited by Redbul; 08-11-22 at 01:45 PM.
#27
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https://buyee.jp/item/yahoo/auction/...uggest_history
Version four harness. This might be a good investment., especially if yours is substantially missing. Expected landed cost to be as much as $150 more than bid amount.
It says Engine harness, but it is the Emissions Harness (but may also include the Engine Harness crank position sensors are there). The emoissions harness has a tail that goes back to the transmissoin for back-up light sensors, etc. Rare to have that tail still there (it usually gets sawed off.)
Condition looks very good. New are about $1500.
https://buyee.jp/item/yahoo/auction/...uggest_history
Buyee has a shipping restriction on it, but likely they will lift it. (If you hit the ask button)
Version four harness. This might be a good investment., especially if yours is substantially missing. Expected landed cost to be as much as $150 more than bid amount.
It says Engine harness, but it is the Emissions Harness (but may also include the Engine Harness crank position sensors are there). The emoissions harness has a tail that goes back to the transmissoin for back-up light sensors, etc. Rare to have that tail still there (it usually gets sawed off.)
Condition looks very good. New are about $1500.
https://buyee.jp/item/yahoo/auction/...uggest_history
Buyee has a shipping restriction on it, but likely they will lift it. (If you hit the ask button)
Last edited by Redbul; 08-11-22 at 06:44 PM.
#28
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https://buyee.jp/item/yahoo/auction/...uggest_history
Here is what a FPR looks like. You can get a vacuum test gun from the car part store. Apply vacuum it should open up.
(Shop manual actually has the Tech blowing on it.)
https://buyee.jp/item/yahoo/auction/...uggest_history
Version 4 MAP sensor. Always good to have a spare.
(Actually I grabbed this one just now.)
[It seems the seller in the above links "powergroup" is parting out a Version 4 at the moment. Powergroup is chain of car wreckers across Japan. They usually price items to move fast. So when a car comes in you might get a flurry of sales from that particular car.]
Here is what a FPR looks like. You can get a vacuum test gun from the car part store. Apply vacuum it should open up.
(Shop manual actually has the Tech blowing on it.)
https://buyee.jp/item/yahoo/auction/...uggest_history
Version 4 MAP sensor. Always good to have a spare.
(Actually I grabbed this one just now.)
[It seems the seller in the above links "powergroup" is parting out a Version 4 at the moment. Powergroup is chain of car wreckers across Japan. They usually price items to move fast. So when a car comes in you might get a flurry of sales from that particular car.]
Last edited by Redbul; 08-11-22 at 07:06 PM.
#29
Junior Member
Thread Starter
https://buyee.jp/item/yahoo/auction/...uggest_history
Version four harness. This might be a good investment., especially if yours is substantially missing. Expected landed cost to be as much as $150 more than bid amount.
It says Engine harness, but it is the Emissions Harness (but may also include the Engine Harness crank position sensors are there). The emoissions harness has a tail that goes back to the transmissoin for back-up light sensors, etc. Rare to have that tail still there (it usually gets sawed off.)
Condition looks very good. New are about $1500.
https://buyee.jp/item/yahoo/auction/...uggest_history
Buyee has a shipping restriction on it, but likely they will lift it. (If you hit the ask button)
Version four harness. This might be a good investment., especially if yours is substantially missing. Expected landed cost to be as much as $150 more than bid amount.
It says Engine harness, but it is the Emissions Harness (but may also include the Engine Harness crank position sensors are there). The emoissions harness has a tail that goes back to the transmissoin for back-up light sensors, etc. Rare to have that tail still there (it usually gets sawed off.)
Condition looks very good. New are about $1500.
https://buyee.jp/item/yahoo/auction/...uggest_history
Buyee has a shipping restriction on it, but likely they will lift it. (If you hit the ask button)
Thank you! This is alot of info but I always appreciate it. Going to take another look at vacuum lines and see if I can find something weird in there.
Would you recommend plugging in my PFC once I have the appropriate tune to see if I can see what sensor is malfunctioning?
#30
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https://buyee.jp/item/yahoo/auction/...uggest_history
This is likely the same as your ecu. Please refer to the pic of the innards. You want to see nice clean circuit boards. If your ecu is fried, it might smell burnt, even from the outside.
Sorry to bomb you with this stuff. It is just that this one seller has pics of a lot of Version 4 stuff to share.
Most of the ecu I have opened up appear very robust and clean, but sometimes the corrosion is obvious.
This is likely the same as your ecu. Please refer to the pic of the innards. You want to see nice clean circuit boards. If your ecu is fried, it might smell burnt, even from the outside.
Sorry to bomb you with this stuff. It is just that this one seller has pics of a lot of Version 4 stuff to share.
Most of the ecu I have opened up appear very robust and clean, but sometimes the corrosion is obvious.
Last edited by Redbul; 08-11-22 at 07:15 PM.
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SeaPanda (08-11-22)
#32
Junior Member
Thread Starter
https://buyee.jp/item/yahoo/auction/...uggest_history
This is likely the same as your ecu. Please refer to the pic of the innards. You want to see nice clean circuit boards. If your ecu is fried, it might smell burnt, even from the outside.
Sorry to bomb you with this stuff. It is just that this one seller has pics of a lot of Version 4 stuff to share.
This is likely the same as your ecu. Please refer to the pic of the innards. You want to see nice clean circuit boards. If your ecu is fried, it might smell burnt, even from the outside.
Sorry to bomb you with this stuff. It is just that this one seller has pics of a lot of Version 4 stuff to share.
#34
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Thread Starter
#35
Hey...Cut it out!
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Before you condemn the ECU, can you give us a recap of what the current issue(s) are? The grounds you showed in pictures recently don't look exactly great, but they don't look like the trailer harness on my Expedition before I rebuilt it. To make a long story short, only the insulation was left in a few wires and the actual copper poured out as a blue powder.
Corrosion is starting to set in as it is exposed bare copper. It might skew readings a bit (higher than normal resistance to ground, so voltage goes UP), but I don't think it would just "nope" out entirely. Of course, resistance measurements will verify what's going on either way.
#36
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You have checked codes and should be able to trust the results.
If , like I suspect, a lot of the system has been removed, you need to address what you are going to do before plugging in a power FC.
There are specific power FC for each version so you have to match. Also, I believe Apexi may have updated the various power FC across the various versions.
Note Versions 1~3 of the stock ecu were 8 bit and subsequent ecu were 16 bit.
There is, I am told ,a power FC support group you can join by subscription. They can give you all the guidance you need and even show how to hook up the power FC to a laptop. They provide (or sell) software that automatically tunes your power FC to your particular set-up (or lack thereof, haha).. I have not gone that far yet, but it is likely worth looking into.
New power FC are not cheap. Used one's may have problems. Probably good ones turn up for about $800.
Google Apexi Power FC and find their site. They should list which of their models match which version of FD.
Be mindful that checking vacuum lines often results in solenoid nipples breaking off (particularly the green twin solenoid). So you need to have a plan to replace broken solenoids.
Likewise if you still have a rat box, a broken nipple on a rat box is a sad thing.
Use a a pike to loosen the hose tip, a proper hose puller and some dish soap (or liquid wrench). Twist the hose off gently.
But before that , listen to hear any vacuum leaks.
Another alternative is to have a shop do a smoke test. They hook up a device to your air intakes and pump in smoke. Any system leaks will hopefully show up.
(They will.)
If , like I suspect, a lot of the system has been removed, you need to address what you are going to do before plugging in a power FC.
There are specific power FC for each version so you have to match. Also, I believe Apexi may have updated the various power FC across the various versions.
Note Versions 1~3 of the stock ecu were 8 bit and subsequent ecu were 16 bit.
There is, I am told ,a power FC support group you can join by subscription. They can give you all the guidance you need and even show how to hook up the power FC to a laptop. They provide (or sell) software that automatically tunes your power FC to your particular set-up (or lack thereof, haha).. I have not gone that far yet, but it is likely worth looking into.
New power FC are not cheap. Used one's may have problems. Probably good ones turn up for about $800.
Google Apexi Power FC and find their site. They should list which of their models match which version of FD.
Be mindful that checking vacuum lines often results in solenoid nipples breaking off (particularly the green twin solenoid). So you need to have a plan to replace broken solenoids.
Likewise if you still have a rat box, a broken nipple on a rat box is a sad thing.
Use a a pike to loosen the hose tip, a proper hose puller and some dish soap (or liquid wrench). Twist the hose off gently.
But before that , listen to hear any vacuum leaks.
Another alternative is to have a shop do a smoke test. They hook up a device to your air intakes and pump in smoke. Any system leaks will hopefully show up.
(They will.)
Last edited by Redbul; 08-12-22 at 01:55 AM.
#37
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I bought in this Version 4 harness tonight. This is substantially what your complete emissions harness should look like. The clump of connectors in the middle (orange, Blue, green, white, etc.) hook up to the rat box as marked by the colour coded dots.
If they are not there, they may have been deleted.
Version 4 Emissions Harness (possibly with subharnesses).
If they are not there, they may have been deleted.
Version 4 Emissions Harness (possibly with subharnesses).
#39
Junior Member
Thread Starter
I appreciate all the help in getting my car on the road.
Could you link where you found the manual for the version 4, I can't seem to get anything when I search for it.
#40
Hey...Cut it out!
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I'll go through the vacuum lines one more time, and I do have photos of me in the engine bay haha but I'm mainly kneel on the core support.
I appreciate all the help in getting my car on the road.
Could you link where you found the manual for the version 4, I can't seem to get anything when I search for it.
I appreciate all the help in getting my car on the road.
Could you link where you found the manual for the version 4, I can't seem to get anything when I search for it.
If it's the one I'm thinking of, it's also locked with two passwords. Took me a few days to crack it and split it back into the original books. Makes it a bit more human-compatible that way. This is one time where making the homework as easy as possible should be priority #1.
If all else fails, I'm ~5hrs away in St Louis. I may have some time starting tomorrow, once I get this Japanese VIN Database sorted out. Sifting through 50,000+ VIN numbers to get production numbers, fun times...
#41
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Watch out for manual download sites with Russian URL. You may get what you want, but they may get what you have,
The "laujesse" pdf is searchable, alright, one page at a time.
Btw: I am getting back from a friend a Version 4 ecu.
The "laujesse" pdf is searchable, alright, one page at a time.
Btw: I am getting back from a friend a Version 4 ecu.
Last edited by Redbul; 08-13-22 at 08:45 PM.
#44
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Nope. The diagram is not to scale or reflective of the actual instalation. Most of the stuff, if it is still there, is tucked under the UIM or can be accessed by removing the upper air pipes, or both.
Have a new Uim/LIM gasket (about $16) ready for when you lift off the UIM.
If you still have the twin (green) solenoid mounted to the front of the UIM, remove it carefully, without (at first) attempting to disconnet the four vacuum lines sproutlng from it.
If, and when, you do remove those vacuum lines, make sure to mark the locations well.
Having said all that, there are a few things you might have to access from below.
Have a new Uim/LIM gasket (about $16) ready for when you lift off the UIM.
If you still have the twin (green) solenoid mounted to the front of the UIM, remove it carefully, without (at first) attempting to disconnet the four vacuum lines sproutlng from it.
If, and when, you do remove those vacuum lines, make sure to mark the locations well.
Having said all that, there are a few things you might have to access from below.
#45
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https://cdnyauction.buyee.jp/images....pbrtg35133.jpg
This is a fantastic resource. They often get bid up to $800.
It is a bit used, but then you won't mind using it.
Cornerstone of any manual collection.
This is a fantastic resource. They often get bid up to $800.
It is a bit used, but then you won't mind using it.
Cornerstone of any manual collection.
#46
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https://buyee.jp/item/yahoo/auction/...uggest_history
Buy as a curiousity just to study it. Or to harvest the good solenoids.
This seller has about 10 for sale.
Buy as a curiousity just to study it. Or to harvest the good solenoids.
This seller has about 10 for sale.
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Akagis_white_comet (08-16-22)
#47
Hey...Cut it out!
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https://buyee.jp/item/yahoo/auction/...uggest_history
Buy as a curiousity just to study it. Or to harvest the good solenoids.
This seller has about 10 for sale.
Buy as a curiousity just to study it. Or to harvest the good solenoids.
This seller has about 10 for sale.
The following users liked this post:
Akagis_white_comet (08-18-22)