Im having some trouble with my 3rd gen. It seems to misfire/breakup at low load/cruzin speeds. But if you get past it, It seems ok at WOT. Boost is about 8lbs. It's been annoying the **** out of me because i can't seem to figure out whats wrong... the car always had a slight misfire/breakup at about 6k at WOT before i did anything to the car. That has always been a problem.

BUT It totally disappeared after i installed an E6k. AND It ran awesome for about two weeks. Then one day it just died. I towed it home and found fouled plugs. I put in a new set and the car fired right up. It seemed to be ok for about a half an hour but then it started to misfire. When you would drive it, it would buck and surge. I got fed up and bought an Digital 6, DIS-2, Twin post Msd Coil(leading) and 2 Blaster SS coils thinking it had something to do with the ignition. After screwing around i finally got that the ignition setup...
It turns out you need to run the stock ignitor to get them to work.

Anyhow that elimated the surging and bucking BUT it still had a misfire if you revved it up to 4k at idle and tried to hold it there. It would sound like if you had a 2 step hooked up. Almost like the timing is retarding too. Now im figuring the ignition has got to be good because i changed everything and my problem is fuel related. So i threw in some fuel injector cleaner to see if that would help.

Well Within days the bucking and surging came BACK just like before. So I ripped out the injectors out of fury and sent them to get cleaned. I checked the spray pattern of the primarys before i took them out and they did seem to squirk ok. SO now i don't feel so confident that when i do get them back that it will solve my problem.. SO What do you think could be the problem if my injectors turn out to be fine? Has anyone experienced the same problems?

 

sounds like you need to do some fine tuning of the fuel map. what was the EGT or AFR at your problem point?

 

I thought so too but no matter how much i change the fuel map it still does it. And the air/fuel is not that bad, its like 12.1~12.9. And it ran absolutely fine with that fuel map when i first installed the e6k.

 

What kinda AFR meter?
Where was the probe inserted?
Don't take the AFR numbers at face value...


-Ted

 

it's a motec wideband with ntk sensor. The car has stock twins and the 02 is mounted in the stock location. It's not the tuning! I have tried leaning it out and fatten it up and it's the same ****. Something is wrong with the car. I still haven't heard anything about my fuel injector but i shoud know by the end of the week.

The car just doesn't sound right. It's got a rapsy sound to it. It's definitely not revving up smoothly. I don't know what else could be wrong.

 

Look at the "Haltech/MSD Ignition Set-up" messages in this link and see if your ignition setup is comparable:

http://groups.yahoo.com/group/Haltec...msd%20settings

 

I have my msd's setup using the stock ignitor to fire them. My E6k is set to constant charge, 3ms, falling.

Maybe i need to raise it to 5ms? What exactly does that do?

 

Have you tried adjust the ignition maps?



-Ted

 

No. What should i do? The more i think about it the more i think it's an ignition problem. It sounds like something is off. Could my Crank angle sensor be bad?

 

Always adjust conservatively first - so back the ignition timing down 5-degrees to see if it does anything or change the sound.&nbsp If nothing changes, try and adjust ignition back up +5 from original and keep an ear out for detonation or funny noises.



-Ted

 

I will try that as soon as i get my injectors back from cleaning. What do you think that rapsy sound is? it sounds like it's on a 2 step

 

I took a quick peek at your map that you sent me...

Where did you get this map from?
The ignition map is really weird!
Some of your fuel map go up and down...

One suggestion - change the staging bar away from the "0" as much as possible.&nbsp If you're running large staggered fuel injectors, run the staging bar two down from "0".&nbsp The "0" crossover does weird things when you set the staging bar very close to it.

The maps all look kinda rough.&nbsp How much time has been put in to tuning them so far?

It really sounds like the car is running rich.&nbsp The throttle pump maps can be all cut down a little - this might be the problem?&nbsp If you're constantly hitting the throttle, an overly rich throttle pump maps can literally flood the engine...



-Ted

 

Ok but why such a wierd sound.. And also how do you explain that it ran fine for 2 weeks and now it's gone crazy. Also could you set the stage and throttle pump correctly and send me the map.. Thanks. Also make adjustmusts to the timing if you feel that it's not okay.

Thanks
Again