Jump to content

Server Lease Renewal/Software Licenses

Our yearly server lease, software licenses, as well as hardware operating costs, ARE due Dec 6th, 2021. Our current donations have fallen far short of the funds we need to renew. Please remember the RennTech.org community is Member supported so please consider a donation to help...  THANK YOU!

Welcome to RennTech.org Community, Guest

There are many great features available to you once you register at RennTech.org
You are free to view posts here, but you must log in to reply to existing posts, or to start your own new topic. Like most online communities, there are costs involved to maintain a site like this - so we encourage our members to donate. All donations go to the costs operating and maintaining this site. We prefer that guests take part in our community and we offer a lot in return to those willing to join our corner of the Porsche world. This site is 99 percent member supported (less than 1 percent comes from advertising) - so please consider an annual donation to keep this site running.

Here are some of the features available - once you register at RennTech.org

  • View Classified Ads
  • DIY Tutorials
  • Porsche TSB Listings (limited)
  • VIN Decoder
  • Special Offers
  • OBD II P-Codes
  • Paint Codes
  • Registry
  • Videos System
  • View Reviews
  • and get rid of this welcome message

It takes just a few minutes to register, and it's FREE

Contributing Members also get these additional benefits:
(you become a Contributing Member by donating money to the operation of this site)

  • No ads - advertisements are removed
  • Access the Contributors Only Forum
  • Contributing Members Only Downloads
  • Send attachments with PMs
  • All image/file storage limits are substantially increased for all Contributing Members
  • Option Codes Lookup
  • VIN Option Lookups (limited)

Boxster 3.4 running rich


Recommended Posts

Hello, so this is the problem I am facing now. I have a boxster 98 2.5 tip that I upgraded to “1999” 996 3.4L. I am using boxster harness modified the harness by adding ground to pin 58. It seems to me the car is running rich. You can smell it from the exhaust; also the car loses gas real fast. When car is running and I step on the gas black smoke comes out of the exhaust. The car runs strong and doesn’t seem to lose any power; the only noticeable thing is the black smoke and of course losing lots of gas. I hooked the computer to both PS2 and OBDII and these are the codes I found:

PS2: P0157, P0300, P0301, P0304, P0137, P0131, P0151

OBDII: P0157, P0300, P0301, P0304, P0137, P0151, P0131, P1115, P1119, P1319, P1313, P1316.

At this point I am not sure what’s causing the engine to run rich... ECU, O2 sensor? Help please

Thanks

Ali

Link to comment
Share on other sites

  • 1 month later...
Hello, so this is the problem I am facing now. I have a boxster 98 2.5 tip that I upgraded to “1999” 996 3.4L. I am using boxster harness modified the harness by adding ground to pin 58. It seems to me the car is running rich. You can smell it from the exhaust; also the car loses gas real fast. When car is running and I step on the gas black smoke comes out of the exhaust. The car runs strong and doesn’t seem to lose any power; the only noticeable thing is the black smoke and of course losing lots of gas. I hooked the computer to both PS2 and OBDII and these are the codes I found:

PS2: P0157, P0300, P0301, P0304, P0137, P0131, P0151

OBDII: P0157, P0300, P0301, P0304, P0137, P0151, P0131, P1115, P1119, P1319, P1313, P1316.

At this point I am not sure what’s causing the engine to run rich... ECU, O2 sensor? Help please

Thanks

Ali

OK. Finally problem solved:

1) I had 3 bad O2 sensors, and I know why. Well actually I got 3 after market O2 sensors "$18 each- I was curious". I cut the old sensors connectors and reconnected the wires from new sensors to old connectors. Now I am not sure if the sensors are not good for boxster’s application, or if I made a mistake and miss-wired. As a solution I got 3 new O2 sensors and that resolved the issue. "I shall get the after market O2 sensors try and re-wire them see if I can make them work". Car did not run rich any more, no smelly exhaust or black smoke.

2) The second part of the problems was caused by a leak in the cold Air intake hose connecting air throttle body to air intake cone. All the after market hoses I purchased "as much as $375" did not work and kept leaking air. I think they did not work because they were designed to fit a car with e-gas air throttle “which points opposite direction from none e-gas. At the end I got 3" aluminum pipe + 2 x 90 degree silicone hoses + 2 straight silicone hoses and D-clamps. Customizing cold air intake hose is the way to go. Looks nice, fits perfect. No more Air leaks and no more CE warning!!

"p.s i shall add pics later in my '2.5tip to 3.4 conversion' post"

A serious thank you to Loren and Todd, you guys rock

Thanks again

Ali

:renntech:

Link to comment
Share on other sites

Hello, so this is the problem I am facing now. I have a boxster 98 2.5 tip that I upgraded to “1999” 996 3.4L. I am using boxster harness modified the harness by adding ground to pin 58. It seems to me the car is running rich. You can smell it from the exhaust; also the car loses gas real fast. When car is running and I step on the gas black smoke comes out of the exhaust. The car runs strong and doesn’t seem to lose any power; the only noticeable thing is the black smoke and of course losing lots of gas. I hooked the computer to both PS2 and OBDII and these are the codes I found:

PS2: P0157, P0300, P0301, P0304, P0137, P0131, P0151

OBDII: P0157, P0300, P0301, P0304, P0137, P0151, P0131, P1115, P1119, P1319, P1313, P1316.

At this point I am not sure what’s causing the engine to run rich... ECU, O2 sensor? Help please

Thanks

Ali

OK. Finally problem solved:

1) I had 3 bad O2 sensors, and I know why. Well actually I got 3 after market O2 sensors "$18 each- I was curious". I cut the old sensors connectors and reconnected the wires from new sensors to old connectors. Now I am not sure if the sensors are not good for boxster’s application, or if I made a mistake and miss-wired. As a solution I got 3 new O2 sensors and that resolved the issue. "I shall get the after market O2 sensors try and re-wire them see if I can make them work". Car did not run rich any more, no smelly exhaust or black smoke.

2) The second part of the problems was caused by a leak in the cold Air intake hose connecting air throttle body to air intake cone. All the after market hoses I purchased "as much as $375" did not work and kept leaking air. I think they did not work because they were designed to fit a car with e-gas air throttle “which points opposite direction from none e-gas. At the end I got 3" aluminum pipe + 2 x 90 degree silicone hoses + 2 straight silicone hoses and D-clamps. Customizing cold air intake hose is the way to go. Looks nice, fits perfect. No more Air leaks and no more CE warning!!

"p.s i shall add pics later in my '2.5tip to 3.4 conversion' post"

A serious thank you to Loren and Todd, you guys rock

Thanks again

Ali

:renntech:

Do you mind posting the info on the generic o2 sensors that you used? Where did you buy them? Did you do any special type of connection from the old wires - new?

Link to comment
Share on other sites

Hello, so this is the problem I am facing now. I have a boxster 98 2.5 tip that I upgraded to “1999” 996 3.4L. I am using boxster harness modified the harness by adding ground to pin 58. It seems to me the car is running rich. You can smell it from the exhaust; also the car loses gas real fast. When car is running and I step on the gas black smoke comes out of the exhaust. The car runs strong and doesn’t seem to lose any power; the only noticeable thing is the black smoke and of course losing lots of gas. I hooked the computer to both PS2 and OBDII and these are the codes I found:

PS2: P0157, P0300, P0301, P0304, P0137, P0131, P0151

OBDII: P0157, P0300, P0301, P0304, P0137, P0151, P0131, P1115, P1119, P1319, P1313, P1316.

At this point I am not sure what’s causing the engine to run rich... ECU, O2 sensor? Help please

Thanks

Ali

OK. Finally problem solved:

1) I had 3 bad O2 sensors, and I know why. Well actually I got 3 after market O2 sensors "$18 each- I was curious". I cut the old sensors connectors and reconnected the wires from new sensors to old connectors. Now I am not sure if the sensors are not good for boxster’s application, or if I made a mistake and miss-wired. As a solution I got 3 new O2 sensors and that resolved the issue. "I shall get the after market O2 sensors try and re-wire them see if I can make them work". Car did not run rich any more, no smelly exhaust or black smoke.

2) The second part of the problems was caused by a leak in the cold Air intake hose connecting air throttle body to air intake cone. All the after market hoses I purchased "as much as $375" did not work and kept leaking air. I think they did not work because they were designed to fit a car with e-gas air throttle “which points opposite direction from none e-gas. At the end I got 3" aluminum pipe + 2 x 90 degree silicone hoses + 2 straight silicone hoses and D-clamps. Customizing cold air intake hose is the way to go. Looks nice, fits perfect. No more Air leaks and no more CE warning!!

"p.s i shall add pics later in my '2.5tip to 3.4 conversion' post"

A serious thank you to Loren and Todd, you guys rock

Thanks again

Ali

:renntech:

Do you mind posting the info on the generic o2 sensors that you used? Where did you buy them? Did you do any special type of connection from the old wires - new?

I shall post the info soon, I will try and correct my wiring and use all 4 generic sensors this time "last time I used 3 generic and one factory original". I got the O2 sensors off of ebay for about $25 each I think "on ebay under boxster parts". I shall rewire, reinstall and see if that resolves the problem.

Link to comment
Share on other sites

Hello, so this is the problem I am facing now. I have a boxster 98 2.5 tip that I upgraded to “1999” 996 3.4L. I am using boxster harness modified the harness by adding ground to pin 58. It seems to me the car is running rich. You can smell it from the exhaust; also the car loses gas real fast. When car is running and I step on the gas black smoke comes out of the exhaust. The car runs strong and doesn’t seem to lose any power; the only noticeable thing is the black smoke and of course losing lots of gas. I hooked the computer to both PS2 and OBDII and these are the codes I found:

PS2: P0157, P0300, P0301, P0304, P0137, P0131, P0151

OBDII: P0157, P0300, P0301, P0304, P0137, P0151, P0131, P1115, P1119, P1319, P1313, P1316.

At this point I am not sure what’s causing the engine to run rich... ECU, O2 sensor? Help please

Thanks

Ali

OK. Finally problem solved:

1) I had 3 bad O2 sensors, and I know why. Well actually I got 3 after market O2 sensors "$18 each- I was curious". I cut the old sensors connectors and reconnected the wires from new sensors to old connectors. Now I am not sure if the sensors are not good for boxster’s application, or if I made a mistake and miss-wired. As a solution I got 3 new O2 sensors and that resolved the issue. "I shall get the after market O2 sensors try and re-wire them see if I can make them work". Car did not run rich any more, no smelly exhaust or black smoke.

2) The second part of the problems was caused by a leak in the cold Air intake hose connecting air throttle body to air intake cone. All the after market hoses I purchased "as much as $375" did not work and kept leaking air. I think they did not work because they were designed to fit a car with e-gas air throttle “which points opposite direction from none e-gas. At the end I got 3" aluminum pipe + 2 x 90 degree silicone hoses + 2 straight silicone hoses and D-clamps. Customizing cold air intake hose is the way to go. Looks nice, fits perfect. No more Air leaks and no more CE warning!!

"p.s i shall add pics later in my '2.5tip to 3.4 conversion' post"

A serious thank you to Loren and Todd, you guys rock

Thanks again

Ali

:renntech:

Do you mind posting the info on the generic o2 sensors that you used? Where did you buy them? Did you do any special type of connection from the old wires - new?

I shall post the info soon, I will try and correct my wiring and use all 4 generic sensors this time "last time I used 3 generic and one factory original". I got the O2 sensors off of ebay for about $25 each I think "on ebay under boxster parts". I shall rewire, reinstall and see if that resolves the problem.

Goldnogard

What kind of fuel mileage were you getting when it was running without all the CEL's problems

Catman

Link to comment
Share on other sites

Hello, so this is the problem I am facing now. I have a boxster 98 2.5 tip that I upgraded to “1999” 996 3.4L. I am using boxster harness modified the harness by adding ground to pin 58. It seems to me the car is running rich. You can smell it from the exhaust; also the car loses gas real fast. When car is running and I step on the gas black smoke comes out of the exhaust. The car runs strong and doesn’t seem to lose any power; the only noticeable thing is the black smoke and of course losing lots of gas. I hooked the computer to both PS2 and OBDII and these are the codes I found:

PS2: P0157, P0300, P0301, P0304, P0137, P0131, P0151

OBDII: P0157, P0300, P0301, P0304, P0137, P0151, P0131, P1115, P1119, P1319, P1313, P1316.

At this point I am not sure what’s causing the engine to run rich... ECU, O2 sensor? Help please

Thanks

Ali

OK. Finally problem solved:

1) I had 3 bad O2 sensors, and I know why. Well actually I got 3 after market O2 sensors "$18 each- I was curious". I cut the old sensors connectors and reconnected the wires from new sensors to old connectors. Now I am not sure if the sensors are not good for boxster’s application, or if I made a mistake and miss-wired. As a solution I got 3 new O2 sensors and that resolved the issue. "I shall get the after market O2 sensors try and re-wire them see if I can make them work". Car did not run rich any more, no smelly exhaust or black smoke.

2) The second part of the problems was caused by a leak in the cold Air intake hose connecting air throttle body to air intake cone. All the after market hoses I purchased "as much as $375" did not work and kept leaking air. I think they did not work because they were designed to fit a car with e-gas air throttle “which points opposite direction from none e-gas. At the end I got 3" aluminum pipe + 2 x 90 degree silicone hoses + 2 straight silicone hoses and D-clamps. Customizing cold air intake hose is the way to go. Looks nice, fits perfect. No more Air leaks and no more CE warning!!

"p.s i shall add pics later in my '2.5tip to 3.4 conversion' post"

A serious thank you to Loren and Todd, you guys rock

Thanks again

Ali

:renntech:

Do you mind posting the info on the generic o2 sensors that you used? Where did you buy them? Did you do any special type of connection from the old wires - new?

I shall post the info soon, I will try and correct my wiring and use all 4 generic sensors this time "last time I used 3 generic and one factory original". I got the O2 sensors off of ebay for about $25 each I think "on ebay under boxster parts". I shall rewire, reinstall and see if that resolves the problem.

Goldnogard

What kind of fuel mileage were you getting when it was running without all the CEL's problems

Catman

The CEL problems started right after i installed the 3.4 on my boxster, so i always had the CEL lights from day one. after swapping the O2 sensors + fixing the cold air leak, thats when all CEL codes were corrected. only now my 3.4 boxster runs normal "i am guessing it has the same fuel mileaga as a 996". if you have other ways of telling fuel mileage let me know and i shall test.

Ali

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.