4AGZE Turbo Spitting/Missfireing at 3lb Boost

[abently]

Make sure your plugs are R type. The shielding used on the CAS wiring for Microtechs is well below standard and is a known issue.

Though you've mentioned it occurs only at 3psi so its either some incorrect timing/fuel value or a faulty MAP sensor...

Download the Microtech User manual here if you have trouble finding the relevant values > http://www.microtechefi.com/software/ltmanual.pdf

[oldcorollas]

Microtechs have an onboard MAP sensor in the ECU, they don't use the AFM.

ahh ok. they don't even have the option? hmmm

[Revolution]

I will try noting down the values tomorrow and post them up. I put a fresh set of plugs in this after non but no change. I will try the filter in the morning and then the leads.

Thanks for all the help so far it is greatly appreciated !!!!!

[The Witzl]

ahh ok. they don't even have the option? hmmm

OC... imagine the microtech as a megasquirt with the map sensor installed.
Now you understand.

[oldcorollas]

ahh ok. i didn't realise they were that advanced and thought just used externals..

[TERRA Operative]

OC... imagine the microtech as a megasquirt with the map sensor installed.
Now you understand.

That's probably all it really is.

[abently]

OC... imagine the microtech as a megasquirt with the map sensor installed.
Now you understand.

Now your talking my language !

[Revolution]

Ok I was able to find the T-Map values but nothing on Vac and Boost (most likley im not looking in the corrct area or its in code)

T-Map Values

10hg - 37
05hg - 18
00hg - 23
2 psi - 42
4 psi + 0
6 psi - 02
8 psi - 04
10 psi - 06
14 psi - 09

[oldcorollas]

whacky. what about T-rpm values?

http://www.microtechefi.com/software/ltmanual.pdf
page 23 of pdf, page 21 of the doc....

you would think.. that the0psi/0hg would be a zero value.. so that at WOT on NA motor, engine just goes to T-rpm table...
perhaps it was tuned by a monkey?

then again, maybe th eproblem goes much deeper, and the timing pickup is way too offset, requiring stupid numbers? but even then, that table above makes little sense

[Revolution]

T-Rpm Values

Idle + 20
1000 + 16
1500 + 11
2000 + 40
2500 + 27
3000 + 30
3500 + 32
4000 + 33
4500 + 34
5000 + 34

[oldcorollas]

well.. the spark map looks all wrong.....
there is some decrease with boost, but the vac side is all wrong unless you have some stupid offset between real timing and actual timing..

even so, you might be going from
+15 at -2.5psi
+10 at 0psi
-9 at 2psi
+33 at 4psi

no wonder 3psi is shit....

[abently]

Well that throws out the dodgy Mircotech theory. Which saves you money and time, plus now you know whoever tuned it has no clue either..

Change the T-map values, 00Hg and 2psi, and see how that goes.

T-Rpm @ 2000 also is out of place...

[Revolution]

Hey Guys

I thought you might like an update on the Seca.

I have changed the values that seemed all out of whack and surprise surprise its fixed the problem.

Thanks for all of your help and advice its proven invaluable.Infact you have probably saved me a small fortune.

Now all I ned to organise is a professional tune and I can get this little rocket ship onto the track and give it a proper test.

Darren

[StuC]

i had similar problems with the microtech in my old car (NA though) There seems to be a lot of monkey, dumb-fisted tuners about that can tune Power FCs and nothing else. I was road tuning my car for months to get it smoother throughout the revs, better at idle, cold start, get rid of pinging etc - and that was after i paid good money for a tune. I had it better before i sent it to the guy! Oh well, its a big learning curve isnt it.

[TERRA Operative]

And those monkeys end up giving a decent product a bad name.

The ECU is only as good as the tune that's in it.