Help Ls6 supercharged issues!!?
Thread Starter
Instructor
Joined: Jul 2005
Posts: 229
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From: Burlington michigan
Help Ls6 supercharged issues!!?
Typically I'm on here for my c5 vert. But I recently purchased a ls6 cts-v supercharged. Tonight I was on my way home and the check engine light came on and it started to back fire. This is the first time it started to happen. The light shuts off after I start being nice to it. If I get on it hard the light starts blinking and it starts backfireing again. The question is did I do somthing bad, or is me electrical screwed up?... Has anyone had this happen? Did I destroy my motor?
Thread Starter
Instructor
Joined: Jul 2005
Posts: 229
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From: Burlington michigan
Ok, so I just let it cool down and took it for a drive to check the symptoms. It is fine at low RPM's. If I shift it into fifth from a roll it takes off normal. But when I down shift to high rpm's it starts back fireing and starts blinking check engine light. I then let off and start driving at lower rpm's (3000-4000) and it's fine. but if I start getting on it above 4500 it starts back firing and the engine light start blinking. It never did this before.... Let me know what u guys think!!
Racer
Joined: Jan 2010
Posts: 360
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you need more information to have any idea what you are dealing with.
need to pull codes. most auto parts stores will pull your codes free and give you a printout
Sounds to me like it may be going lean, if so you need to stop immediately driving it and resolve what is happening.... lean and boost will absolutly destroy a motor in short order.
need to pull codes. most auto parts stores will pull your codes free and give you a printout
Sounds to me like it may be going lean, if so you need to stop immediately driving it and resolve what is happening.... lean and boost will absolutly destroy a motor in short order.
Thread Starter
Instructor
Joined: Jul 2005
Posts: 229
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From: Burlington michigan
ok, that's two for two for checking the codes, so i'll have that done first then! The car does have a skunky/burnt rubber coming from under the hood, so i may have melted some wires or something.... i really didn't notice until i walked out in the garage after it had been parked for a bit.
Thanks
Nick
Thanks
Nick
Tech Contributor
Joined: Apr 2007
Posts: 10,924
Likes: 78
From: Forney Texas
If you're saying the lights are dimming, sounds like you have a voltage problem in the car. Possibly bad alternator, battery, or grounds. High throttle and RPM increases electical demand.
Team Owner
Joined: Jan 2007
Posts: 29,063
Likes: 1,838
From: cookeville tennessee
New battery all is well now..
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Race Director
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From: Raleigh, NC
St. Jude Donor '15
as everyone else has said, start there
Thread Starter
Instructor
Joined: Jul 2005
Posts: 229
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From: Burlington michigan
I borrowed a code reader from one of my buddies. I won't be able to check it out till after work, which will be early in the A.M. When I was referring to "The light shutting off" I was talking about the check engine light. It would come on and start blinking, then when I shifted it into a higher gear to get the rpm's back to normal (2000ish) the check engine light would shut off within an eighth mile.... This showing some of the same symptoms of what my c5 was doing when my cat's imploded (running alright at low rpm's, then like junk at high rpm's.) I'm just crossing my fingers I didn't injure my motor...
Melting Slicks
Joined: Apr 2000
Posts: 2,793
Likes: 46
From: Elizabeth City, NC
I borrowed a code reader from one of my buddies. I won't be able to check it out till after work, which will be early in the A.M. When I was referring to "The light shutting off" I was talking about the check engine light. It would come on and start blinking, then when I shifted it into a higher gear to get the rpm's back to normal (2000ish) the check engine light would shut off within an eighth mile.... This showing some of the same symptoms of what my c5 was doing when my cat's imploded (running alright at low rpm's, then like junk at high rpm's.) I'm just crossing my fingers I didn't injure my motor...
Thread Starter
Instructor
Joined: Jul 2005
Posts: 229
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From: Burlington michigan
You are correct, it has a maggie set Up. I'm curious to why these are so popular on the v's? I have an A&A set up that I will be installing on my vert this winter. The guy I purchased the car off of said he has had to replace the magnavolt set up a few times... How would I go about checking the volts on magnavolt? Also I have a kenne bell boost a pump just laying around at the house. Would that be a chore to install, and woul I have to get it retuned?
Melting Slicks
Joined: Apr 2000
Posts: 2,793
Likes: 46
From: Elizabeth City, NC
They are popular because they are perfect for a heavy car. Make lots of TQ down low where you need it. Makes the V a blast to drive. As for checking it you will need a mighty vac that has the pressure option on it and pressurize the boost port and then check to see if the output voltage goes up like its supposed to. Or hook up a fuel pressure gauge and see if there is a rise in FP when you get into boost. But I would rather test it without having to run the car since you risk running lean.
Thread Starter
Instructor
Joined: Jul 2005
Posts: 229
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From: Burlington michigan
I linked the code reader and it showed that no codes had been set.... I guess my next step will be to check the "boost a pump." Anyone else have some idea's, I'm going to check the battery as also was suggested. I wish I had a good performance shop in the area....
Burning Brakes
Joined: Jul 2004
Posts: 1,087
Likes: 10
From: Hernando MS
May want to check or replace your plugs. I had an issue once when my car would start to misfire on hard exceleration and higher boost. My plugs were blowing out during those conditions. Fresh plugs fixed the issue.
Thread Starter
Instructor
Joined: Jul 2005
Posts: 229
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From: Burlington michigan
I like that idea being it is pretty much easiest thing start with. I'm just scared to do that then have it start missing again, I really don't want to destroy my motor.... Should I do a compression check while I'm at it? Also what kind of wires should I pick up? I'll just stick with whatever spark plugs are in it now.