confused about A/F and dif ECU +40's

[lancer402]

I have a 2.5 16v hybrid in my lancer. I have been running a FWD trim cal SMEC. It has 88 wiring. Yesterday I am cruising about 300 miles from home and get check engine lite. Alternator is overcharging. First I change altnator, same problem. Then I pull out the spare SMEC which is a stock one, and overcharging is fixed. But now I am running a stock SMEC with +40 injectors. I figure I have to lower the fuel pressure but my wide band shows it to be way to lean to even cruise down the highway. I raise the fuel pressure and its ok.

I get home and start working on it. I figure I will take the +40 out. Even with 55psi fuel pressure + the stock fuel injectors, it runs way lean and hardly runs at all. Idle AF ratio is above 17. I have to manually turn on a 5th injector to get it to lightly accelerate.
I try several different sets of TII injectors with the same results. Then I go back to the +40's and its better. But now when I cruise at 65MPH the AF hovers around 15.4 instead of 14.7. And as I lightly step on the gas it goes leaner.
Before I bought the trim cal and +40's, I had a stock T2 SMEC and stock injectors and it ran fine.
I know the head flows better than the 8 valve. someone shed some lite here


Thanks
andy

[speeduphoria]

i recomend getting an external voltage regulator and look in the FAQ section at the top of the board on how to wire it in.

[puppet]

You sure you have 55psi FP at the rail with the vac line disconnected ... or just guessing?
Maybe the fuel pump isn't putting out.

[GLHNSLHT2]

Sounds like the Regulator on the board died. I have an 87 T2 LM that had that happen. Will Cindy replace it? Hope so for the price. As for your fueling that's a bit odd. You were running 16v on stock T2 electronics and injectors and it ran fine??

[xrattiracer]

being that its a smec, you can replace the power board inside the case with one from any other turbo smec. if the alternator field driver is shot (which it sounds like it may be) that will fix the problem.

[xtrempickup]

sounds like your cal has issues. either get it fixed or drive the car and risk burning a piston

[lancer402]

Quote:

Originally Posted by puppet You sure you have 55psi FP at the rail with the vac line disconnected ... or just guessing? Maybe the fuel pump isn't putting out.

I have a gauge on the afpr and its set at 50 psi right now with line disconnected. you think 5 more will make a diff?

I drove it again this morning on the highway. While cruising at steady speed it hunts for 14.7 afr. lightly step on gas and it drops to 16.5. never did this before.
step on it harder and it goes to somewhere around 12. but at idle the aem wide band is off the scale lean, over 17. runs but lumpy idle.

[lancer402]

Quote:

Originally Posted by xrattiracer being that its a smec, you can replace the power board inside the case with one from any other turbo smec. if the alternator field driver is shot (which it sounds like it may be) that will fix the problem.

Yes sounds like the altnator control is shot. I can replace the board that holds this with another from a stock smec and it wount affect the trim call stuff.
Is this fairly easy once located? Is there any de-soldering to do?

thanks
andy

I havent called cindy yet, board is two years old and about 70K miles.

[lancer402]

Quote:

Originally Posted by xtrempickup sounds like your cal has issues. either get it fixed or drive the car and risk burning a piston

Im working on geting it fixed. In the mean time I am not boosting, believe it or not.

andy

[jim34]

The stock smec wont work right with a 3bar map, put the stock map in and the stock injectors and keep the boost down and fpr up till you fix the tc.

[GLHNSLHT2]

Quote:

Originally Posted by xrattiracer being that its a smec, you can replace the power board inside the case with one from any other turbo smec. if the alternator field driver is shot (which it sounds like it may be) that will fix the problem.

But the LM board tells the PM board when to adjust the voltage. Unless they moved it on a smec which I doubt. Like I said, I've got a LM board here like that.

[lancer402]

Quote:

Originally Posted by jim34 The stock smec wont work right with a 3bar map, put the stock map in and the stock injectors and keep the boost down and fpr up till you fix the tc.

Jim, I owe you one! That's it for sure, I left the 3 bar MAP in.

what an idiot I feel like.

andy

[lancer402]

Quote:

Originally Posted by GLHNSLHT2 But the LM board tells the PM board when to adjust the voltage. Unless they moved it on a smec which I doubt. Like I said, I've got a LM board here like that.

So I just took the smec apart and see the two boards. Looks like the top one is the power board. I can just replace this one??? Or does the logic module have more to do with it. even if it does, the bad part most likely is in the power board. Thanks for pointing this out

andy

[xrattiracer]

yes, you can swap out the top (power) board. its still possible theres a problem with the logic board or even the cal itself, but at least this is something you can try yourself.