30 replies to this topic

[Speedsterfromnorth]

Post a new log file.

 

The file is too big. 

How to send it ? 

[smiley]

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

 

[smiley]

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

[Speedsterfromnorth]

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 :-)

[smiley]

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

[vocky]

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.

[Speedsterfromnorth]

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

[markanswrth]

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

[pkhumanis73]

Well, you found 1 air leak.

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.

Thanks for the information!

[pkhumanis73]

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.

[SamCoffee]

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.

Useful info, where do I go for parts?