My 98 cobra is running like crap

trevors · Joined: May 19, 2011 Posts: 5

I bought an sct programer and plugged it in follwed all the instructions then after i was finished, naturally i wanted to take it for a spin. Much to my suprise it ran like crap and has ever since. It is driveable, but if i get on it and try to push the rpms past 3500 it boggs down. I took to majestic motorsports (never again). They ran diagnostics and ecerything checked out fine but they said they noticed the lag when test driving it as well. Any ideas? Or possibly someone who has had a similar problem

ricanstang · Smokin' Tires Joined: Oct 09, 2008 Posts: 2480

where did u get the proggrammer from? i got mine from american muscle and when i first plugged it in it ran like crap so i sent them a detailed list of everything i had done to the car and they sent me new tunes and told me to use a diferent ecu code next time i order tunes and my car has ran great since, so its more than likely just a bad tune.
_________________

ScreamingFast · Site Admin Joined: Aug 17, 2008 Posts: 11379

I would load the stock tune in it for now and talk to the guys you got it from like rican said. Is a can tune from SCT or custom tune?
_________________

TOWGUNNER · Posted: Mon May 23, 2011 3:46 pm Post subject:

^^^ what they said

stang910 · Posted: Mon May 23, 2011 4:41 pm Post subject:

Start by installing your stock tune.

At 3500rpm your charge motion plates are supposed to open..... maybe you have some sort of mechanical or electrical failure. SCT programmers are known to blow fuses every now and then so I would start there since its the easiest place to start.

trevors · Joined: May 19, 2011 Posts: 5

I tried to return it to stock. Still runs like crap. I've went through the fuses and they are good. All the diagnostics read good, it's a real pain in the a$$

ScreamingFast · Site Admin Joined: Aug 17, 2008 Posts: 11379

What are you mods on the car and do you know if it was tunned prior?
_________________

stang910 · Posted: Mon May 23, 2011 8:35 pm Post subject:

I think your gonna have to pull the intake off and clean the cmcv (charge motion control valve) or imrc (intake mainifold runner control) is what they called them back then. They get carbon build up on them and won't open or close correctly. The actuator may not be working correctly which also could be the problem. Since your bog comes in at 3-3.5k I'm gonna assume this is your problem. You might want to look into the imrc delete also, but it requires a tune. It's hard to diagnose a car without actually seeing or driving it, but I'm pretty sure this is your problem. Good luck with the repair.

Agent007 · Posted: Mon May 23, 2011 8:57 pm Post subject:

I thought cmcv's were a relatively new addition to mustangs! Will he be able to modify his existing cmcv plates like you can with 3V's?
_________________
13.03@104.9 mph. ARH LT's, MAC O/R Prochamber, FRPP 4.10's Moroso Spiral Flows, GT500 STB.

stang910 · Posted: Tue May 24, 2011 4:59 am Post subject:

trevors · Joined: May 19, 2011 Posts: 5

i've only had it 2 months, put the cold air intake and it had not been tuned before. I'll try that though. Thanks for the advice!

Agent007 · Posted: Tue May 24, 2011 7:00 pm Post subject:

stang910 · Posted: Tue May 24, 2011 7:52 pm Post subject:

Make sure you got a tune for it.

Agent007 · Posted: Tue May 24, 2011 7:59 pm Post subject:

I was assuming I could just plug in my Livewire and select CMCV Deletes? If not, who would you suggest I get an e-mail tune for this? Sorry for the thread jack Trevors!
_________________
13.03@104.9 mph. ARH LT's, MAC O/R Prochamber, FRPP 4.10's Moroso Spiral Flows, GT500 STB.

stang910 · Posted: Tue May 24, 2011 8:03 pm Post subject:

Your good with the livewire if it has that adjustment. I couldn't remember if it did or not.


Create an Account		Home · WOT Forums · WOT Photos · WOT Videos · WOT Classified Ads · WOT Club Calendar · Regional Radar · Track Weather · Your Account