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Check engine light P0171, P0302

Old 05-06-2009, 09:11 PM
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Check engine light P0171, P0302

I have a check engine light on my RX-8. I took it in to Autozone to get the code read. It came back with P0302 (rear rotor misfire) and P0171 (system too lean). The car seems to be running fine. Although I have not revved it hard since it has been raining. I got a misfire code a few months ago but it reset and went away after a few days. Also, the spark plugs were replaced about 8000 miles ago.

Has anyone had these codes together? Does anyone have any ideas on where to start?

Thanks,

EDIT: Put in new coils and leads and now the misfire code is gone, still have power loss and lean fuel code
EDIT 2: Solved peoblem see https://www.rx8club.com/series-i-trouble-shooting-95/vacuum-line-broken-174804/

Last edited by GotBass; 05-31-2009 at 06:29 PM.
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Old 05-07-2009, 12:09 AM
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Originally Posted by GotBass View Post
I have a check engine light on my RX-8. I took it in to Autozone to get the code read. It came back with P0302 (rear rotor misfire) and P0171 (system too lean). The car seems to be running fine. Although I have not revved it hard since it has been raining. I got a misfire code a few months ago but it reset and went away after a few days. Also, the spark plugs were replaced about 8000 miles ago.

Has anyone had these codes together? Does anyone have any ideas on where to start?

Thanks,
you dont mention miles, but #one with a bullet is the fuel pump, on a close second are coils..

but fuel pump will likely win..

beers
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Old 05-07-2009, 08:56 AM
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68,800 miles.

I pushed the engine a bit this morning, not fully since the road was still damp. It seems like there is either a loss of power or poor throttle response in the mid RPMs like 4-6. It kind of hesitates for a half second.

Any way to tell if it is the fuel pump before replacing it?
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Old 05-08-2009, 02:41 AM
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Originally Posted by GotBass View Post
68,800 miles.

I pushed the engine a bit this morning, not fully since the road was still damp. It seems like there is either a loss of power or poor throttle response in the mid RPMs like 4-6. It kind of hesitates for a half second.

Any way to tell if it is the fuel pump before replacing it?
not really,

but that is what mine did before it just randomly started shutting down..

have you done any premixing?

beers
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Old 05-08-2009, 04:12 PM
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IL

I have not done any premixing.

I have done some reading on coil issues and I thinking this may be coils. Almost 70,000 and they have not been replaced yet. Either way, this probably needs to be done so I'll see if that is the problem first.

Another thing, the car takes a bit longer to turn over when starting up cold. This has been something that has gradually been getting worse for a while. And its up to 3-4 seconds sometimes. Dont know if it is related, but now that I have read up on some coil issues I'm thinking maybe it is.
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Old 05-08-2009, 09:38 PM
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Originally Posted by GotBass View Post
I have not done any premixing.

I have done some reading on coil issues and I thinking this may be coils. Almost 70,000 and they have not been replaced yet. Either way, this probably needs to be done so I'll see if that is the problem first.

Another thing, the car takes a bit longer to turn over when starting up cold. This has been something that has gradually been getting worse for a while. And its up to 3-4 seconds sometimes. Dont know if it is related, but now that I have read up on some coil issues I'm thinking maybe it is.
that could be either or you motors compression might be low.

i have a set of the new version coils that have about ~ 8 k miles on them. also wires.

pm me if you want.

beers
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Old 05-20-2009, 10:23 AM
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I got new coils and leads and put them on my car the other night.

THE GOOD - The coils were fried and needed to be replaced. The car started up much better and did run better at low RPMs.

THE BAD - I still have the loss of power right at about 4500 and the check engine light came back on.

So I guess I'll move on to other symptoms. I looked through the workshop manual ( found here ) at the fuel pump replacement. The first thing is testing the fuel pressure with a fuel pump gauge. Is this just a generic fuel pump guage or is there a specific mazda part? Also, as far as replacing the fuel pump if I go that route, where can I buy the tool to replace it?
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Old 05-20-2009, 01:50 PM
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I had a P2060 bank 3 lean

= new engine.

Hopefully you have better luck.
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Old 05-20-2009, 07:20 PM
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Originally Posted by GotBass View Post
I got new coils and leads and put them on my car the other night.

THE GOOD - The coils were fried and needed to be replaced. The car started up much better and did run better at low RPMs.

THE BAD - I still have the loss of power right at about 4500 and the check engine light came back on.

So I guess I'll move on to other symptoms. I looked through the workshop manual ( found here ) at the fuel pump replacement. The first thing is testing the fuel pressure with a fuel pump gauge. Is this just a generic fuel pump guage or is there a specific mazda part? Also, as far as replacing the fuel pump if I go that route, where can I buy the tool to replace it?
Theres a DIY thread of how to replace the in tank sock filter you can fin the tool there. you might also want to give seafoam or zoom cleaner a try before you turn it over to mazda.
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Old 05-20-2009, 07:31 PM
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One code down one to go.

Drove my car to work and back today and I just took my car to autozone and got the CEL rechecked. I now just have the lean fuel code P0171 to go along with the power loss. So I guess changing the coils cleared up the misfire.
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Old 05-20-2009, 07:42 PM
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I would get yrou compression checked.. sounds like its about time for a reman
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Old 05-20-2009, 10:03 PM
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Originally Posted by GotBass View Post
Drove my car to work and back today and I just took my car to autozone and got the CEL rechecked. I now just have the lean fuel code P0171 to go along with the power loss. So I guess changing the coils cleared up the misfire.

171 tends to be fuel pump related.. trust me i know.

beers
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Old 05-25-2009, 05:10 PM
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Figured out whats wrong

I looked around some more and found that I broke off a vaccum line on the extention manifold. It is a vaccum line that is about 3 inches and goes back into the extention manifold. It is right above the oil filter, I probably broke it when I changed the filter. Problem is that the plastic nipple that the vaccum line goes into on the manifold broke off and is in the vaccum hose. Right now I put a piece of duck tape over the hole and the car runs fine. So I guess I have 3 options. 1) New intake extention manifold, $363. 2) glue the piece back on which I would have to take the thing off anyway. 3) leave the tape on there.

Any Pettit supercharger owners want to sell me their old extention manifold?

EDIT: Solved the problem see https://www.rx8club.com/showthread.php?t=174804

Last edited by GotBass; 05-31-2009 at 06:30 PM.
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Old 06-27-2011, 10:50 PM
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GotBass this seems like the same problem I am having. Same code and similar power loss description. Swoop I am following your suggestion as to the solution being replacing the fuel pump.

Is this the cheapest around, I did a quick search.
http://www.finishlineperformance.com...cat=338&page=2

Is the black halo worth the extra bills? (what is the difference?)
http://blackhaloracing.com/products-...-pump-upgrade/
or
http://blackhaloracing.com/?page_id=...product_id=178
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