Boxster 3.4 running rich

[goldnogard]

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

[Loren]

What DME are you using? and did you re-program it?

[goldnogard]

What DME are you using? and did you re-program it?

i am using the original boxster DME unit, but i flashed it "reprogrammed" to the 996 riginal "not sport or after market re-programming".

[goldnogard]

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:

[blinkwatt]

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?

[goldnogard]

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.

[catmanluge]

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

[goldnogard]

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