Hey guys,
I had a base tune done for my car and it ran decent. It was a bit lean at WOT, so I just stayed out of it. However, idle and drivability was perfect. I just changed over from Brian Crower 272's to GSC S2's and also changed my FMIC from an XS Power to a Nisei. The car starts, but dies a few seconds later. I verified that everything is timed correctly, and also that the CAS and trigger wheel are installed correctly. Could the increase in camshaft lift affect the manifold pressure enough to cause the car to not run? I don't have a logging system nor do I know enough about tuning to check. I need the car to drive to the tuner, and right now, it can't do that.

 

generally cams will make a pretty big difference to vacuum at idle. call the tuner and ask him to make a couple changes to your map so you can get to him safely. it probably needs more fuel in the lower cells of the main fuel map and maybe a little more timing in the lower cells too.

 

He won't send me a tune, as he keeps blaming me for installing the cams wrong. See here: https://www.evolutionm.net/forums/ev...ar-ablaze.html.
I understand that Speed Density works off of manifold pressure. Would this extra lift/duration from the new cams cause it to start up and shut right off after a few seconds?

 

sent you a pm.

 

yes cams are enough to throw off your tune. BC cams suck real bad, and then you put some awesome GSC cams on there, so yes your tune is more than likley way off.

 

Sent you a pm back.

Thanks for the response. I hope I can get this POS figured out.

 

your afr's are most likely the cause for your car not wanting to idle.

do you have a laptop to connect to your car /aem? if so, then you have all the logging necessary...that is if you have a wideband installed...

your tuner should know better that swapping cams will throw the idle aspect off. since he doesnt, i suggest locating another tuner. yeah, you can open up the f/b parameters to control everything under the sun, but then you'll have hunting idle, unstable performance.

im sure people here would gladly help you out, but if you dont have a means to a laptop w/aem pro on there, call a tow truck or have ur tuner come to your house....

hell, just see if you can buy a long a$$ serial port cable to connect your home pc straight to your ecu!

 

he doesnt have a cable or anything so its going to be tough.

 

Are you in harleysville Pa.?

 

I saw in another thread of his, there is question regarding the installation of his new cams & gears..... so all this is moot if the install wasnt performed accurately.

if it was, then he should go buy a 12ft rs232 cable to make this happen....

he gets onto evom somehow.....if its with a home pc, he just needs to download the program, buy a cable, put the pc in the garage & hook that ***** up. I am sure some people would happily walk him through the basics....

hell, even if he didnt have a wideband, u can still sort out your idle...

.... idk, what will happen sooner, the tuner going to his house, towing the car to the tuner or buying a cable & sorting it out himself....

he is the only 1 who can answer that..... how bad does he want to get his car running? anyone have a magic wand laying around?

 

Alright. That other thread was to verify that the timing was on to eliminate that issue. I'm not going to tow the car to a shop at first reaction because I've built plenty of cars myself. However, I just bought this Evo and was not prepared for the cam install to throw off the tune so much so that I couldn't drive it to the tuner.

I want the car to run extremely bad, hence me working on it every single night until 1am trying to find the problem.

I already downloaded the AEM software, and did so as soon as I figured out that it was tune related. I also ordered the cable. I'm constantly trying to figure things out. All I wanted was an answer from a tuner stating Yes or No to my question: "Could the cam change throw off my tune enough for it to not stay running".

Like I said, I planned on it starting right back up. I pulled the VC off and went through every cam install step 3 times.

Thanks for your help everyone, and I hope that explains where I'm at a little better.

 

Sent you a PM.

 

I'm getting so frustrated as I have not gotten one straight answer about anything from anyone (about the timing or the tune, other than n2oiroc who has been very informative and helpful), so there is no way for me to "magically" know what is wrong with the car.

 

did you try retarding the exhaust cam 3-4 degrees to see if it ran like that?

 

Getting to it in a few hours. I'll keep you updated.