Check engine light P0171, P0302
#1
Still plays with cars
Thread Starter
Join Date: Jul 2004
Location: Chicagoland
Posts: 312
Likes: 0
Received 0 Likes
on
0 Posts
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/
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.
#2
Zoom-Freakin'-Zoom
iTrader: (5)
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,
Has anyone had these codes together? Does anyone have any ideas on where to start?
Thanks,
but fuel pump will likely win..
![Smilie](https://www.rx8club.com/images/smilies/smile.gif)
beers
![Beer](https://www.rx8club.com/images/smilies/beer.gif)
#3
Still plays with cars
Thread Starter
Join Date: Jul 2004
Location: Chicagoland
Posts: 312
Likes: 0
Received 0 Likes
on
0 Posts
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?
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?
#4
Zoom-Freakin'-Zoom
iTrader: (5)
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?
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?
but that is what mine did before it just randomly started shutting down..
have you done any premixing?
beers
![Beer](https://www.rx8club.com/images/smilies/beer.gif)
#5
Still plays with cars
Thread Starter
Join Date: Jul 2004
Location: Chicagoland
Posts: 312
Likes: 0
Received 0 Likes
on
0 Posts
![IL](https://www.rx8club.com/images/icons/il.jpg)
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.
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.
#6
Zoom-Freakin'-Zoom
iTrader: (5)
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.
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.
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
![Beer](https://www.rx8club.com/images/smilies/beer.gif)
#7
Still plays with cars
Thread Starter
Join Date: Jul 2004
Location: Chicagoland
Posts: 312
Likes: 0
Received 0 Likes
on
0 Posts
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?
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?
#9
WENTGERMAN
iTrader: (6)
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?
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?
#10
Still plays with cars
Thread Starter
Join Date: Jul 2004
Location: Chicagoland
Posts: 312
Likes: 0
Received 0 Likes
on
0 Posts
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.
#13
Still plays with cars
Thread Starter
Join Date: Jul 2004
Location: Chicagoland
Posts: 312
Likes: 0
Received 0 Likes
on
0 Posts
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
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.
#14
T-29 years and counting
iTrader: (3)
Join Date: Apr 2005
Location: North Fontana, CA.
Posts: 3,062
Likes: 0
Received 0 Likes
on
0 Posts
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
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
Thread
Thread Starter
Forum
Replies
Last Post
akagc
RX-8's For Sale/Wanted
7
08-11-2015 07:07 PM