Yes, and so far they haven't even told me they have the injectors. Apparently they changed physical locations and UPS couldn't find them for a week. Disappointing.

I'm still hopeful they'll confirm receipt of the injectors.

Regards,

 

Email roger@928srus and you will have it in 2 business days.

 

Roger and I are very old friends. You're exactly right on this...

Best Regards,

 

zekgb

I've had this same issue for quite some time, even with a couple intake refreshings. I’d like more details on troubleshooting the TPS and the details of jumping pins B and C on the diagnostics connector.

I've replace both the TPS and the ICV and still have the issue. After the challenges of chasing a vacuum leak under the intake, I really don’t want to pull it again. All help is greatly appreciated.

Don

Don

 

My experience is with the early 32V engine which has a diagnostic port that is used to bypass the ICV when adjusting idle speed. The S4 engine has no such manual idle adjustment so you just have to go through and verify the working condition of every component in the system that could be the cause ie, throttle not closing properly, vacuum line off of fuel regulator, vacuum leaks, faulty or incorrectly adjusted throttle switch, faulty Temp II sensor or bad LH computer. Happy to send you some details on the smoke tester I built if you are interested.

 

As with the S3 you need to check that the S4 idle switch is adjusted properly so that it closes when then engine is hot.

Has the O2 sensor been replaced?

 

[QUOTE=PorKen

Has the O2 sensor been replaced?[/QUOTE]

Yes. I replaced the O2 sensor about a year ago.

I’m wondering if I have the TPS adjusted correctly. I’ll check tomorrow.

thanks.

Don

 

You're in Boulder Creek? I'm about 12 miles north of you in Big Basin. That should work well? I'll supply refreshments? Just let me know your preferences?

I don't know if I'll be here long enough to get all the parts in, right now the injectors are the long pole, but I'll keep everyone posted. I may have to go back to Paso soon, I have some ignition parts for my 944 S2 that just came in. The shop there isn't finished yet (no lift) but should be in the next couple months.

Best Regards,

 

DT san jose now, just havent updated.

 

All

i made a big difference by loosening the throttle cable. The problem is still there, but I think I can live with it for a while. I just wrestled with a vacuum leak under the intake and am not looking forward to removing the intake the check the TPS. I tried to listen for the click when moving the throttle, but was unable to hear anything. I’m thinking the TPS is out of adjustment, although I was very careful to adjust it properly when the intake was off. Maybe the TPS is bad. Only two years old. Things to ponder.

Is there a test for the TPS?

Please let me know the outcome of your endeavors.

Thanks

Don

 

I had done an intake refresh a couple of years ago but didn't do the TPS. I decided to replace the TPS as preventative maintenance so I pull it apart install new TPS. I then get high idle (850-900) like some one just flips a switch either while idling or driving after warmup. I thought it was the ICV that I just replaced so I put another ICV. Still does it. I did smoke and pressure test and all pass. I buy new ICV and new TPS pull apart change both. Still from 650 rpm to 850-900. I pull it apart again and install yet another new TPS and check idle and WOT function with Theo software. All three TPS's work fine as far as clicks and software is concerned. I pull it apart again and install old TPS and now it idles at 650 rpm and I haven't had the problem since and it has been a year. All the new TPS's are Bosch so it's not like bought junk but something is not right with the new ones that purchased. I also had my MAF and LH refurbished to see if that was the problem and it was not.

With all that said I think yours is either TPS or vacuum leak.

 

Yeah, I worry about that. After reading your tribulations I think I'll try the throttle cable tension as you and Ken suggest, then the TPS, then vacuum.

You really have to love these cars to go through this

 

Still, not as far as Paso If I can get the parts I'll let you know?

Regards,

 

Well at least the TPS is easier to get to on the S3 than the S4 (that may be the only intake component we can say that about!)

 

Yes!! Removing intake to get at TPS 5 or so times is excruciatingly painful.