7mgte sync loss while cranking

[Jdmfreak]

Thanks for all the help so far

OK so I made a bunch of progress but it still will not run.... I am no longer having sync issues


I also found one of the t connections in my vac line was plugged....

Now it wants to start:-) I've been playing around with the cranking pulsewidth, prime pulse and the ve table to try to get correct fuel to start but all I get is rpm picking up about 50-70 rpm every few seconds of cranking and exhaust telling me I am close..... No more backfires

[Jdmfreak]

What is the best way once timing is set to get it to start? How do I know if I'm giving it not enough or too much fuel?

[nismoautoxr]

pull a plug or 2 and see if they are wet or dry.

[Jdmfreak]

So what is timing err and why does mine go crazy??

[Jdmfreak]

So I am totally lost here, why when I set the cas like the Msextra website says to then shoot the crank with timing light is it 60°retarded?? That doesn't make sense to me... Also when I add the 60° to the tooth #1 angle (from 20 to 80)(everyone I see that's running a 7m on ms is using a trigger #1 angle of 20) the timing light says it's dead on and I get extremely loud backfires

[nismoautoxr]

well the logical conclusion would be that the cas is misindexed compared to other installs or there is a valve timing issue and naturally if you are firing the number one cylinder at 60* ATDC you will get exhaust bangs because its firing the mixture when the exhaust valve is open. Is your install on an engine that was running fine on a stock ecu or has the engine been apart since then ?

[Jdmfreak]

stock engine was running fine



I got it running ...evidently that wiring diagram for the cas was wrong for my car...i probed the wires going to each sensor to figure this out....once i had it wired correctly it fired right up:)

how is she looking now???

[nismoautoxr]

cam signal still looks all jacked up picking up lots of extra teeth but the NE signal looks pretty nice. Im guessing by the looks of the cam signal you got it running on wasted spark.

[Jdmfreak]

No, its running full sequential which pot do I need to turn up to smooth that out?

[nismoautoxr]

cam signal pots are on the 3x board here, but, if its running good then you may choose not to mess with it right now. May also wanna give a read to this

[Jdmfreak]

i think i finally got it

[nismoautoxr]

looks pretty good indeed. Noticed a couple drops on the crank but all in all the tooth times are looking much much better and the cam does too. Good work man.

[Jdmfreak]

Thanks... How perfect does it need to be?

[jsmcortina]

That log looks good to me too.

James

[Jdmfreak]

Awesome now tuning

[TerrenceLP]

Awesome now tuning

So what was the fix? Can you share a tune file?

[Jdmfreak]

I got it running ...evidently that wiring diagram for the cas was wrong for my car...i probed the wires going to each sensor to figure this out....once i had it wired correctly it fired right up:)

I missed your post somehow terrence,

[suberimakuri]

Hi guys, after reading his post about swapped wires I thought I'd better mention this.
On 4AGZE CAS, which is similar/same to 7MGTE the wire coloring coming out of the CAS changes at the CAS plug (15cm along the harness).
So if you go by the harness colors you might have incorrect color wires. This caused me a lot of grief.
Best is to pop cap of CAS and double check sensor wire colors, then trace through the plug and to your ecu.

[Jdmfreak]

Same with the 7m, however the wire colors in the diagrams for the cas itself are wrong, always double check inside