ECMlink Engine stalls when clutch pedal is depressed.

[my98gsx]

After doing a GM alternator swap on my GSX I developed a very frustrating issue. The car dies as soon as the clutch pedal is depressed... I did some research and this is what I've done thus far.

1. Cleaned the IAC, and reinstalled
2. Swapped the IAC for a brand new one
3. Checked for vaccume leaks
4. Ran new ground wires to the coil bracket and head.
5. Checked clutch fluid level.

I've seen several posts regarding this issue and I think I covered all the fixes already... now I'm stumped. Any help will be appreciated.

Video of the issue (car warmed up)

You must be logged in to view this image or video.

 

[pauleyman]

You had no issues prior to this alternator swap?

 

[Vegas Smith]

Can you post a log of the activity?

 

[my98gsx]

No issues at all... just my dumb luck.

Vegas yeah, I'll take a log in a few and post it.

 

[my98gsx]

Here is a log, the engine was not warm - but it does not make a difference when it comes to stalling.

 

[Vegas Smith]

I have no idea. Sorry. I can't see anything wrong with the log.

 

[AWD-Tony]

Haven’t seen the log. Try unplugging the alt, start it and see if still turns off.

 

[95eclipseGST008]

Check your crankshaft for end play. Jack the car up, remove driver's side wheel, grab ahold of the harmonic balancer and push it in and out.

 

[my98gsx]

Check your crankshaft for end play. Jack the car up, remove driver's side wheel, grab ahold of the harmonic balancer and push it in and out.

Oh god, I better not have any play I will he furious!!! I will give it a shot though. I will also try the alt unplugged.

 

[agentorange313]

This has never happened to any of my DSMs but I just experience this with my Evo. Pushed the clutch in after the vehicle was warmed up and the car would stall out. Turned out to be "crankwalk", crankshaft end play, worst case scenario. Block was scap, same with the crank. Had to replace the short block.

 

[AWD-Tony]

This has never happened to any of my DSMs but I just experience this with my Evo. Pushed the clutch in after the vehicle was warmed up and the car would stall out. Turned out to be "crankwalk", crank shape end play, worst case scenario. Block was scap, same with the crank. Had to replace the short block.

On an engine that does have crank walk, is it stalling because you’re slowing down the crank when you press the clutch in?

 

[my98gsx]

My engine is fully built with a complete manley rotating assembly including their turbo tuff crank... I am going to flip out if this thing has play in it. I will need some time to check though - work has been crazy.

 

[my98gsx]

I was enjoying the last of my s2000 weather here in NY and wasn't working on the GSX's stalling problem until last night... I took all of the above mentioned ideas and did the following.

1. Checked for crankshaft play - none found (checked with clutch being depressed, slave cyl off, and with a pry bar no play found during each check) Engine has 504 miles on it, with a manley crank.
2. Unplugging alternator - Still stalls when clutch is depressed
3. Removal of all accessory belts - Ran the car without WP/PS/Alt - Still stalls
4. Checked mechanical timing to confirm ECMlink electrical timing - Spot on...

My friend who was helping me is a generator tech, and performed grounding/voltage testing with his multi meter. He found that my grounding was good, and that the new alternator is putting out almost 2 Volts more than the stock alternator at idle... I was lucky to get 12.8V with the mitsu unit, and now I am getting 14.5V with the Bosch/GM. With this added voltage going to my fuel pump is it possible this is causing the issue?? I am running quite rich now (12.6-low 13's) at idle, which was never seen prior to my alt swap. Although 12.6 at 1,000 rpm is quite rich I've seen cars idle without issue even fatter than this...

I am totally lost at this point... any other ideas anyone?

 

[Vegas Smith]

As you know injectors behave differently depending on voltage and it can’t hurt to return the dead time to get better fuel trims.

 

[AWD-Tony]

Only thing I can see from the log is that your clutch switch isn't working. Fuel trims are also not registering. Not sure if these have anything to do with it stalling.