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Old Nov 1, 2024 | 12:09 PM
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From: East Moriches NY
Starting question

Firstly sorry for the long drawn out post...

So after some work and time and soaking the APV valves through the intake I got them freed up. I reconnected the catalytic converter and then seafoamed the engine. Couple of questions maybe everyone can answer:

Runs runs really rough when I first start it backfires then after about 20 seconds it clears out and I can let it idle a little high and it seems to be running. It definitely breaks up if I try to rev it up high.
How long does it take for the sea foam to burn off? The backfired pretty loud a few times when I started it and smoked as expected. I got a bunch of new errors which I'm assuming is due to the seafoam.

The car is still pretty hard to start but I finally got it to rev all the way I have not taken it out for a drive yet what would make it so hard to start? Still running rough

Here is what has been done so far:

New plugs
New wires (everything installed correctly)
New coils
Cold air intake. This was on the car previously.(I have a plug that's open since I took the original air box out can I just tape that up?) pic below
New MAF sensor
Cleaned ESS (totally gunked up)
New battery
New starter higher torque
SeaFoamed the engine
New fuel

Here are the errors I got after seafoam
P301 cylinder 1 misfire
Also P0171 System too lean bank 1

I stopped at 5k then all of a sudden cleared out and reved all the way up.
Hopefully the vid loaded. This is miles ahead of where I started but actually rougher than yesterday.



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Old Nov 1, 2024 | 12:19 PM
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That looks like the VFAD plug, so yes you can tape it up.
System too lean is either a big vacuum leak, a fuel delivery issue or a wildly inaccurate MAF.. which could happen with a junk intake. What exactly is it?

The symptoms sounds like miswired injectors or miswired spark plugs/coils. What's the history of the car before this started?

Does it idle at a normal 800 rpm when warm without help?

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Old Nov 1, 2024 | 12:26 PM
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No it does not idle at 800. It only idles a a higher rpm. At 800 it stalls. Never had since I got it. Always been difficult to start. Has to turn over a number of times. I haven't had a chance to really work on it so once it started backfiring and wouldn't start I had to put it away. Are there any posts to figure out if the wiring is an issue with the injectors? Where would I look what would I be looking for?
I'm not sure of the intake it was on it when I got it

I folloed all the wiring diagrams for the coils and plugs


Last edited by johnnyv4449; Nov 1, 2024 at 12:30 PM.
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Old Nov 1, 2024 | 02:42 PM
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Injector wiring : https://www.rx8club.com/new-member-f...iagram-257491/

Can you take a picture of the intake? Other things to consider: SSV stuck open, jet air ports not connected.. you can inspect these visually and try to move the SSV by hand.

The other valves could also be the problem, but they're harder to get to, so easy things first.
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Old Nov 1, 2024 | 08:03 PM
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I know all the valves are working because I went over the SSV and cleaned it. I got the APV working again. I pretty much went over everything I could. I'm actually not sure what to look for at this point. Should I put the stock air box in? I have it

I don't see any name on the cold air intake.


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Old Nov 2, 2024 | 02:25 PM
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I removed the UIM again and am checking the vacuum hoses. They all seem very hard and can be pretty much pushed off with a screwdriver easily. I'm going to replace the lines. What size is the smaller vacuum lines (like the one that works the SSV) 3.5mm?
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Old Nov 3, 2024 | 06:28 AM
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Your intake has 2 vacuum lines. There should be 3 if it's a 2004-2008. Whwre do those 2 go? You need to get vacuum to the oil injector vacuum plenum, idle air jets and oil fill neck.

It's an ebay intake or similar.

Last edited by Loki; Nov 3, 2024 at 06:32 AM.
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Old Nov 20, 2024 | 10:54 PM
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[img alt="If you look at this photo you can see the 3 breather hoses going to the intake i only see 2 on your intake unless he other is underneath you can use this to try to find the missing one.
"]https://cimg9.ibsrv.net/gimg/www.rx8club.com-vbulletin/613x611/intake_air_hose_routing_5d293df47d7c3d38bc9abb8a79 50d8e535b31abe.jpg[/img]
If you look at this photo you can see the 3 breather hoses going to the intake i only see 2 on your intake unless he other is underneath you can use this to try to find the missing one.
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Old Nov 21, 2024 | 06:01 AM
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Car looks pretty dirty up in the engine bay, can see some rust as well. One thing I would also check is make sure your grounds are not corroded. From my experience when I had a similar issue, I found that my battery terminals and a chassis ground was pretty corroded. Take a wire brush and clean them off real good. For the RX8s the ignition system will benefit from proper ground connections. My rx8 had a huge misfire, a similar issue you have explained and when I replaced my coils and plugs, it still was getting intermittent misfire and a not so great idle. Cleaned up the ground connections I could find and reset the ecu. Stomp the brake pedal about 20 times to reset the Eccentric shaft position sensor and relearn the idle. Again, that is what worked for me but these cars are a can of worms.
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Old Nov 21, 2024 | 05:31 PM
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If you've replaced that much it might help to reset the ecu which can be done by having the key in the off position holding the trip reset button down they turning key to on while still holding button till it says test ( I think it says test I can't remember but it says something on the trip screen) then turn the key off as for ground as mentioned the main one I would clean would be the plate one right above the oil drain bolt on the center iron you can get at it with the driver wheel removed.
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Old Dec 5, 2024 | 01:53 AM
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How is everything going now?

And can anyone over here help me in searching for a site online where I can find career research essay example? Thanks in advance.

Last edited by MorganHill; Jan 30, 2025 at 01:40 AM.
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Old Dec 17, 2024 | 09:58 PM
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Hi guys,

im totally new, finally got a car that I always wanted and my plan its to enjoy it and bring it to car shows Nd track.

I have these codes, and want to know if they are typical and normal Rx8 codes:




Car currently works fine, starts well, I premix with Lucas's semi-synthetic 1onz x gallon. Car currently have an oil leak, think is the rear main seal.
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Old Dec 17, 2024 | 11:57 PM
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Definitely not normal. I'm not sure in what situation trouble codes would be normal, but it sounds like you need a rear O2 sensor and a intake valve solenoid, or to check the connection to them. Not sure why the brake pedal would be unplugged but that should be an easy fix as well.

Also please start your own thread in the new member section.
Rx8help.com has great orientation material for new owners, definitely rread through it.
Originally Posted by Lopezrx8
Hi guys,

im totally new, finally got a car that I always wanted and my plan its to enjoy it and bring it to car shows Nd track.

I have these codes, and want to know if they are typical and normal Rx8 codes:




Car currently works fine, starts well, I premix with Lucas's semi-synthetic 1onz x gallon. Car currently have an oil leak, think is the rear main seal.
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Old Dec 18, 2024 | 06:11 AM
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Originally Posted by Loki
Definitely not normal. I'm not sure in what situation trouble codes would be normal, but it sounds like you need a rear O2 sensor and a intake valve solenoid, or to check the connection to them. Not sure why the brake pedal would be unplugged but that should be an easy fix as well.

Also please start your own thread in the new member section.
Rx8help.com has great orientation material for new owners, definitely rread through it.

Thanks for your reply, can you show me what connections I would need to check?
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Old May 1, 2025 | 05:23 PM
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"Can I Do a Compression Test on My 13B Before Reinstalling It?

Good afternoon everyone, quick question—I just finished rebuilding my 13B and I’ve got a rotary compression tester on hand. I’m wondering if it’s possible to test compression before putting the engine back in the car. I don’t have the starter hooked up yet—any tips or suggestions? Thanks in advance!
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Old May 2, 2025 | 07:33 AM
  #16  
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Originally Posted by cranf0rd
Good afternoon everyone, quick question—I just finished rebuilding my 13B and I’ve got a rotary compression tester on hand. I’m wondering if it’s possible to test compression before putting the engine back in the car. I don’t have the starter hooked up yet—any tips or suggestions? Thanks in advance!
You can hook up the transmission and power the starter. However the comp test to be actually representative requires the engine at temperature and have the proper amount of oil/fluids in it. Since you just rebuilt you will have loads of oil and vaseline in there. Not to mention the engine wont be at temp.
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