rolfs_7

ok so i got this NA map tell me whats going on here. the car wont start it kinda acts like the timing is off. anyone got any ideas?

renns

Are you getting a steady tach signal when cranking? Do you have spark? Do you have fuel pressure? Settings look reasonable for first start.

rolfs_7

yeah the car runs fine on the stock ecu

muythaibxr

He meant on the megasquirt, are you getting a steady tach signal, etc...

We need some more details about how you've got everything wired as well.

renns

Ken, based on his other thread it looks like a 1st gen GSL-SE conversion, but more details would sure help!

Rolf, please confirm:
Engine setup (GSL-SE, S4 na, etc)
MS setup (code version, fuel only or fuel+spark)
Verify operation of all sensors - take a datalog during cranking, and post here.

Likely problems are lack of fuel pump power during cranking, and intermittent or no tach signal to MS.

rolfs_7

SE MS 2.2 no spark only fuel oooooo would the resistor between the tach and MS have anything to do with it!?

rolfs_7

ill try with the resistor in place and see what happens 2nite

renns

The resistor is used to eliminate false triggers. You should still see a solid tach signal in MegaTune (a question you haven't answered yet :-)

rolfs_7

sry i didnt have a comp hooked up to it while starting

muythaibxr

NEVER try to start the car for the first time without a laptop. In fact NEVER try to do anything with the MS hooked up without the laptop until it's fully tuned.

We cannot help you unless you have the laptop hooked up and can tell us what it's doing.

rolfs_7

ok sry about last time i got a laptop running now and no im not getting a tach reading. im gettin everything except a tach signal as far as i know..so whats up could my wiring be bad? im double checking 2marrow... what else could it be?

muythaibxr

Could be wiring, the VR sensor conditioner setup, the hysteresis or zero-crossing pots, jumpers inside the MS....

Check those things and then get back to me.

rolfs_7

he VR sensor conditioner setup, the hysteresis or zero-crossing pots??? a lil more info

muythaibxr

Meaning are you running dual VR or single?

Are your potentiometers on the MS board both turned fully counterclockwise?

rolfs_7

i dont have any pots one the MS board?? i ran a wire from the coil 2 the MS but still nothing. im thinking my pin on the MS is wrong..

muythaibxr

Are you running fuel only?

rolfs_7

yeah sry i didnt state that before. pin 24 on the MS is the pick up for the tach right?

muythaibxr

Should be. Where do you have that wired hooked on the car?

rolfs_7

i tried puttin it on both the neg sides of both the coils and got nothing but the stock tach still kicks....

muythaibxr

both coils? Both trailing coils? the leading and trailing? which?

Ken

rolfs_7

i tired on the leading and trailing but nothing

muythaibxr

And you have the tach input circuit configured for input from the negative lead of the coil?

rolfs_7

ummm more details?

muythaibxr

More details is what I'm trying to get out of you!

I need to know what instructions you followed from www.megasquirt.info in reference to the tach signal.

Ken

renns

Rolf,

There must be a harness or MS problem, as triggering from the coil should result in a tach signal without issue. Problems often occur with tach spikes from too strong a tach signal, which is why the series resistor was mentioned a couple months ago. Does the MS box work properly on the stim? If you don't have a stim, borrow one, or send the box off for testing.