[WillyB]

Hello,

I’m wondering if this forum/thread area could help me with an installation issue.

About a month ago I purchased a Turbonetic system (Part Number: 1516 for my ’05 Mustang GT. Over the past month I've been working on it consistently and taking my time. On a cold start up the engine has a rough idle and I receive error codes indicating a rich fuel mixture from both O2 sensors. (My A/F gauge shows a 10)

After the engine has warmed up, idle condition is much better (A/F gauge is around 14.7). I can clear the codes and they only show up on cold start-ups. I performed a test drive and everything seems to be running fine when the engine warmed up. I’ve rechecked the installation procedures several times and couldn’t locate the origin of the problem.

I've searched the forum and it looks like several other customers are experiencing the same issue.

I believe the revision tune is “version 5” on my SCT device, I’m not sure what that means. The sticker on the SCT tuner package has this on it “21898 V5”.


Does anyone have any suggestions or input on how I could go about correcting rough idle/rich A/F mixture on cold start ups?

V/r

[Robert]

Originally Posted by WillyB

Hello,

I’m wondering if this forum/thread area could help me with an installation issue.

About a month ago I purchased a Turbonetic system (Part Number: 1516 for my ’05 Mustang GT. Over the past month I've been working on it consistently and taking my time. On a cold start up the engine has a rough idle and I receive error codes indicating a rich fuel mixture from both O2 sensors. (My A/F gauge shows a 10)

After the engine has warmed up, idle condition is much better (A/F gauge is around 14.7). I can clear the codes and they only show up on cold start-ups. I performed a test drive and everything seems to be running fine when the engine warmed up. I’ve rechecked the installation procedures several times and couldn’t locate the origin of the problem.

I've searched the forum and it looks like several other customers are experiencing the same issue.

I believe the revision tune is “version 5” on my SCT device, I’m not sure what that means. The sticker on the SCT tuner package has this on it “21898 V5”.


Does anyone have any suggestions or input on how I could go about correcting rough idle/rich A/F mixture on cold start ups?

V/r

Have you already checked the usual suspects like fuel pressure at cold start, or vacuum leaks? Are you seeing 20 in/hg at idle on a boost gauge?

[WillyB]

Originally Posted by Robert

Have you already checked the usual suspects like fuel pressure at cold start, or vacuum leaks? Are you seeing 20 in/hg at idle on a boost gauge?

I've checked for vaccum leaks and didn't find any. At idle there is a steady 20in/hg vaccum reading.

Currenlty I'm unable to measure fuel pressure. Is there any other way to measure fuel pressure other then buying an adapter block/guage?

V/r

[Robert]

Originally Posted by WillyB

I've checked for vaccum leaks and didn't find any. At idle there is a steady 20in/hg vaccum reading.

Currenlty I'm unable to measure fuel pressure. Is there any other way to measure fuel pressure other then buying an adapter block/guage?

V/r

Most modern ECU's measure fuel pressure output from the pump via the OBD2 sensors. You could probably use a standard OBD2 scanner to check that.

[WillyB]

Whats the fuel pressure range during cold starts?

V/r

[Robert]

Originally Posted by WillyB

Whats the fuel pressure range during cold starts?

V/r

Base fuel pressure on the 05GT should be 39-40 PSI at idle during cold start.

[WillyB]

The rich A/F mixture didn't show up today. However, the idle is still a little rough.

The rich mixture issue only occurred before the first test drive and today is the first time starting it up after that drive.

I used the kit provided SCT tuner as a data logging medium and came up with these numbers:

ECU1:fuel_rail_pressure_sensor

First 9 seconds : 362

Then the numbers stayed at 550-570 for the rest of the time (90 seconds).

I'm not sure what the specific formula/algorithm is to convert that into psi.

V/r

[TheMadMax]

Originally Posted by WillyB

Hello,

I’m wondering if this forum/thread area could help me with an installation issue.

About a month ago I purchased a Turbonetic system (Part Number: 1516 for my ’05 Mustang GT. Over the past month I've been working on it consistently and taking my time. On a cold start up the engine has a rough idle and I receive error codes indicating a rich fuel mixture from both O2 sensors. (My A/F gauge shows a 10)

After the engine has warmed up, idle condition is much better (A/F gauge is around 14.7). I can clear the codes and they only show up on cold start-ups. I performed a test drive and everything seems to be running fine when the engine warmed up. I’ve rechecked the installation procedures several times and couldn’t locate the origin of the problem.

I've searched the forum and it looks like several other customers are experiencing the same issue.

I believe the revision tune is “version 5” on my SCT device, I’m not sure what that means. The sticker on the SCT tuner package has this on it “21898 V5”.


Does anyone have any suggestions or input on how I could go about correcting rough idle/rich A/F mixture on cold start ups?

V/r

I have an 06 Mustang that I installed the turbonetics kit on and i was having the same problems on cold startup. I am a technician at a dealership and I was having trouble getting the A/F mix correct. I finally took it to a local dyno shop and had them tune it. If you have not added another fuel pump yet I would advise it, because the kit pushes the factory pump to its limit.