3.2 throttle switch adjustment?

[pistolpete]

I am working on a 3.2 that is lacking power.
Freshly rebuilt Motor
Valve adjustment correct.
Rebuilt ECU
New DME
New Tank
New fuel pump
New plugs
New cap and rotor
Tested fuel pressure -good
I have no history with this car. I bought it in boxes and have been working to put it back together.

I am questioning the Throttle switch. Adjustment? How can I test the Switch? How should it be adjusted? It has slotted screw holes so I am assuming that you rotate it but I cannot find anywhere to explain.
The Idle switch does click.
I beleive that the throttle switch effects the distributor through the DME?
Any other ideas would be a great help.

[ErrorMargin]

Originally Posted by pistolpete

I am questioning the Throttle switch. Adjustment?

See image at end of this post for test and adjustment procedure on the full throttle switch.

The first thing I would check is to see that when you press the gas pedal all the way to the floor with your foot that the throttle butterfly valve actually opens all the way. You will need two people for this test. Mine was only opening to 60%, I got a huge boost of power when I adjusted. The adjustment is easiest to do at the throttle rod bell crank on the transmission. See this post for detail. https://forums.pelicanparts.com/porsche-911-technical-forum/1153485-pulled-engine-my-84-targa-now-fun-begins-4.html#post12383270

Next thing I would consider is the fuel injectors, you might want to send them out for testing and cleaning.

[pistolpete]

Thank you for this. I forgot that the injectors were sent out also

[pistolpete]

So I tested the switch and it tested ok. Now I am at a loss as where to turn

[mysocal911]

Originally Posted by pistolpete

I am working on a 3.2 that is lacking power.
Freshly rebuilt Motor
Valve adjustment correct.
Rebuilt ECU
New DME
New Tank
New fuel pump
New plugs
New cap and rotor
Tested fuel pressure -good
I have no history with this car. I bought it in boxes and have been working to put it back together.

I am questioning the Throttle switch. Adjustment? How can I test the Switch? How should it be adjusted? It has slotted screw holes so I am assuming that you rotate it but I cannot find anywhere to explain.
The Idle switch does click.
I beleive that the throttle switch effects the distributor through the DME?
Any other ideas would be a great help.

Where did this "rebuilt ECU" come from? The throttle switch doesn't affect the distributor.

[ErrorMargin]

Originally Posted by pistolpete

So I tested the switch and it tested ok. Now I am at a loss as where to turn

Did you confirm that the throttle butterfly opens all the way when the gas pedal is pressed all the way down in the passenger compartment?

Assuming yes, tell us more about the symptoms. Could you have a cylinder not firing?

[pistolpete]

Loren on here rebuilt the ecu. All cylinders firing

[mysocal911]

Originally Posted by pistolpete

Loren on here rebuilt the ecu. All cylinders firing

Consider calling him, and asking for help, since you spent money with him.

I am working on a 3.2 that is lacking power.

How are you measuring "power"? Have you checked the fuel pressure while driving?
Do you have another 3.2 car for comparison?

[pistolpete]

I have not checked the fuel pressure while driving. Only in the garage idleing and reving. I own a 1985 as well and they are not on the same planet in terms of power.

[ErrorMargin]

Are you getting a good idle and smooth running, just low on power? Does it start right up?

Does your engine builder have any thoughts on the issue?

Potential next steps:

1. Remove the plugs and see if any are fouled. Look for evidence that they are all firing well.

2. Get a wideband O2 sensor installed so you can see if you are getting a good mixture.

[mysocal911]

Originally Posted by pistolpete

I have not checked the fuel pressure while driving. Only in the garage idleing and reving. I own a 1985 as well and they are not on the same planet in terms of power.

So you've switched the DME ECMs, to eliminate a DME ECM as a source of your problem, right?
You can use a timing light to compare the two ignition advance curves.

[pistolpete]

I did not change the ecu. I will do that tomorrow and see if there is any change. I will report back
Thanks for the help

[pistolpete]

So I figured it out- Faulty fuel injection wiring harness. Kept cutting out

[pistolpete]

Thanks for all your help!!

[ErrorMargin]

Originally Posted by pistolpete

So I figured it out- Faulty fuel injection wiring harness. Kept cutting out

Tell us how you diagnosed this.

What did you test first and how did you conclude the harness is bad? This will be a big help to others that might have the same issue.