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P1516 - After Sc Conversion


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#21 Speedsterfromnorth

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Posted 07 May 2019 - 06:24 PM

Post a new log file.

 

The file is too big. 

How to send it ? 



#22 smiley

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Posted 07 May 2019 - 08:24 PM

You can email it to me, and i will post it.

 



#23 smiley

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Posted 08 May 2019 - 08:15 AM

http://www.speedster.../temp/tommy.smp



#24 Speedsterfromnorth

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Posted 07 July 2019 - 06:57 AM

Problem is solved.

IT was a failure inside the lsj throttle body.

Changed to the N/A OEM one with an adapter, and now the failure is gone.

Thx a lot for all Your Help :-)

#25 smiley

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Posted 07 July 2019 - 07:32 AM

That's new. We will add it to the list of the 1516 :tt:



#26 vocky

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Posted 07 July 2019 - 08:05 AM

I have seen quite a few duff SC throttle bodys, normally you get a bad misfire at approx 3000 rpm.

 

The easiest way to check if the TB is duff is to measure the two potentiometers inside the TB, use a good quality meter and open and close the butterfly manually. If the meter suddenly changes mid way across then it's scrap.

 

Basically the potentiometer wears out, no way to repair, just replace with another TB.



#27 Speedsterfromnorth

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Posted 07 July 2019 - 08:50 AM

Where is the best and easiest place to buy a new one ?

#28 markanswrth

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Posted 08 July 2019 - 10:00 AM

Interesting info, need to check this on mine and see if I have the same issue. 



#29 pkhumanis73

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Posted 09 May 2024 - 08:33 AM

Well, you found 1 air leak. thumbsup

Your idle is set to 850 >50*C, so maybe the throttle will close a bit more and lowers MAP to ~35KPa. (If you have hot cams, the idle pressure will be higher)

 

Used MAP sensors often have a worn (square) o-ring. Replace till it fits snug in the manifold, or use some silicone gasket material.

 

The Bosch injectors can be a bit tricky to fit, as they are "almost" the right length. My experience is that you have to mount the rail a bit higher with washers, but also a tad more out with elongated holes.

 

Post a new log with non-leaking sensor. :happy:

Thanks for the information!



#30 pkhumanis73

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Posted 14 May 2024 - 09:05 AM

Quick look at your log  @5000:

rpm ~1150

throttle valve pos. ~9%

MAP 38KPa

Ign -5° (so retarded after BDP, which is not normal...)

 

It looks like the ecu is trying to lower the idle rpm (should be below 1000rpm for a normal stage 2 SC base map?) by shutting the throttle (9% is pretty closed) and if that fails it tries to lower rpm by taking out ignition timing. So you end up with the retarded -5° ignition...

 

I had these issues with a small air leak in the intake tract; so check for air leaks with spraying some brake cleaner around the intake. Also the injector seals can cause airleaks.








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the information was helpful


Edited by pkhumanis73, 14 May 2024 - 09:05 AM.





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