fejjj

I am happy to know that this is a $30 fix now.

I appreciate everyone that responded and helped me here!

This year marks 30 years since I bought my first 951.

I have enjoyed every minute of driving these wonderful cars.

What Rogue tuning (Joshua) has done with his tuning has completely transformed my driving experience and I am grateful to him for all of his efforts.

The Rogue tuning data logger identified the problem immediately and saved me from spending a lot more time, effort and money to solve my problem.

I highly recommend the Logger and all of Rogue tuning's products!

raleighBahn

Awesome - that is great.

Back to the subject of easily getting under the car, I have ramps from Race Ramps - tremendous product. They are lightweight and easy to get out of the way, and I can roll the front or rear of the car up and completely clear them.

fejjj

Not so fast....

Installed new MAP sensor.

AFR's good in all conditions.

Boost great until I hit 5200RPM again.

It also stumbled a couple times after boosting hard in 3rd gear, easing off the throttle then shifting into 4th and accelerating medium boost. The stumble happened around 3200 and then car accelerated smoothly until 5200.

I sent the logs to Joshua so hopefully he can advise.

fejjj

Here is a log converted to .CSV

Rogue_Ant

The cutout is not being caused by the DME software...

It must be something hardware / electro-mechanical that the DME is not aware of.


Can you rev to redline in neutral?

fejjj

Yes I can Rev to redline in neutral.

fejjj

The Fuel cut switch goes from OFF to ON right when the hard cut happens as seen in the .CSV file log.

Doesn't that mean that the DME software is causing it?

Rogue_Ant

No, that is not what is happening.

The fuel cut happens at the end of each high-rpm cutout. This is due to the throttle being let off and triggering the idle switch.
At high rpm, when the idle switch is engaged the DME will cut fuel. I isolated these events; it is pretty clear that the fuel cut follows the idle switch being engaged:

Rogue_Ant

Not sure if these have been mentioned:

fejjj

Thanks Joshua.

Hopefully i can figure this out soon.

Do you guys see any other clues here?

Rogue_Ant

Looks to me like either one of the things in my previous post, or an ignition issue...

fejjj

I will check those items mentioned.

In terms of ignition, I have replaced everything but the coil and the injectors.

I may swap in a known good coil.

Tom M'Guinn

Just FYI, the injectors are not part of the ignition system. The ignition system makes sparks to ignite the fuel. The injectors squirt the fuel in the motor, and so are part of the fuel system. Looks like Josh is helping you get to the bottom of all this, which is great. He'll know what's related to his system and what's not, especially now that you have data.

fejjj

In terms of ignition, what else should I be looking at?

fejjj

I did a visual inspection of the wiring but will need to dig deeper there.

I washed the car this morning and then left for my Dad's house.

It started stumbling badly as soon as I pulled out of the driveway.

I drove about 10 miles to his house and it stumbled on and off boost and seemed to start around 2500RPM

I would also stumble just cruising in 5th gear at 70mph.

Also it was running very rich as well.

I grabbed my computer and took a log after I got home.

I did order a new coil so i can try that as well.