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AtlantaZ

Turbo Project No Start - Help!

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That sucks that they gray out the TW when you select EDIS... With Megatune and the old version of firmware that I run, I can adjust the trigger angle fine in the software. Contact DIY Autotune, or Matt Cramer for advice on that issue.

 

A timing light is ESSENTIAL here. Go get one.

 

 

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It turns out that my cranking and afterstart enrichments were... well, rich! Way too rich. I got a GREAT tune file from a friend, and now I can get it to idle at 800RPM, rock solid, with no throttle input at all. When I do give it throttle, it only revs up to 1500RPM or so. Why would that be? Is it because I have it in limp-home mode? Or is there something else going on, like a vacuum leak?

 

My idling manifold pressure is about 85kPa, and the engine-off pressure reading is 97kPa. Does that sound right?

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It turns out that my cranking and afterstart enrichments were... well, rich! Way too rich. I got a GREAT tune file from a friend, and now I can get it to idle at 800RPM, rock solid, with no throttle input at all. When I do give it throttle, it only revs up to 1500RPM or so. Why would that be? Is it because I have it in limp-home mode? Or is there something else going on, like a vacuum leak?

 

My idling manifold pressure is about 85kPa, and the engine-off pressure reading is 97kPa. Does that sound right?

 

It idles at 85? Do you have a vacuum gauge? That doesn't sound right. The engine off pressure sounds about right, though.

 

If it won't pass a certain RPM it's usually too lean/rich and/or timing is way off. Check the map and smooth it out.

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Whoa, I was going to say that black, sooty plugs are a sign of being way too rich.

 

Engine off pressure of 97 kPa is 14.1 psi, nearly atmospheric which is correct. A reading of 85 kPa is very low for manifold vacuum. That is basically 2 in. Hg; I idled around 18 in. Hg on my setup.

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So either my MAP sensor isn't calibrated right (which I doubt, since engine-off reading is okay), or I have a big fat leak somewhere. Agree?

 

If it had a leak that big, the engine wouldn't be idling at 800. 8000 more likely. Are you sure Tuner Studio has the correct MAP settings in the config? I know some of the MAPs have points where their voltage outputs intersect.

Edited by BLOZ UP

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No, not sure about MAP settings. I am using the stock 2.5 bar sensor and may need to recalibrate... Need to find instructions for doing that in the Megamanual

 

in Tuner Studio it's,

 

Tools / Sensor Calibration

 

select MPX4250 for the default one that MS2 v3.0 board uses.

 

Nigel

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I hope that's all it is. It does seem logical that if the engine were otherwise properly tuned, more intake air would simply mean higher RPMs. Now that I better understand how to use the Trigger Wizard to adjust my timing, I'll try that tonight. After I install my injector o-rings, which I apparently damaged when I installed them dry. Nothing like fuel spray all over my hot engine! :)

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I'll be checking that tonight. The first thing I want to do is use the Trigger Wizard to make sure that actual timing (measured with a timing light) matches commanded timing in Megasquirt. I plan to set the Fixed Timing to 15*, then use the Trigger Wizard adjustments to bring the actual timing to 15*. I'll report results in the morning!

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