Anyone want to try and help out again?

"Nick, Drives a Cobalt LT" (dropagearanddisappear)
07/13/2014 at 15:54 • Filed to: None

I've been having constant issues with my car....I've reflashed the ECM 5 times now with 5 different known good tunes, I've replaced Both MAP sensors, MAF sensor, intake, cam chains, everything I can think of......Still no start.

Its an intermittent issue by the way, I drove it to work one day, and then went to leave work, no start......It will start one day, then a second later no start......I'm getting fuel, spark, and air or else the car would never start. there are no strange codes I'm getting that werent there before.....Anyone want to make some attempt at helping me out?

Its my 2008 Cobalt SS Turbo.

DISCUSSION (24)

PanchoVilleneuve ST > Nick, Drives a Cobalt LT
07/13/2014 at 15:57

*recall joke*

*Jay Lenos around*

*feels bad because I'm Jay Leno, god of gearheads, and I made a negative car joke*

Vince-The Roadside Mechanic > Nick, Drives a Cobalt LT
07/13/2014 at 15:59

Take it to the dealer? But it has got an Opel motor right?

Twingo Tamer - About to descend into project car hell. > Nick, Drives a Cobalt LT
07/13/2014 at 16:00

If it's intermittent I'd guess it's electronic but hard to get more specific than that without seeing the car.

04sneaky - Boxers. Blowers. Bikes. And bitches. > Nick, Drives a Cobalt LT
07/13/2014 at 16:12

Sadly I don't think abything you've replaced so far would be the cause. On the days you can't get it to start what does it do?

For instance, does the cluster and everything power up? Does the starter turn over at all? Does it try to crank but never fires? Do you have two keys and does it start with either key?

erikgrad > Nick, Drives a Cobalt LT
07/13/2014 at 16:32

Intermittently sticky butterfly on the throttle body? Assuming you have checked this, though, but since it takes all of 2 minutes to check, open it up and give it flick during the next no start. (Only mention because this happened to me with the same symptoms, not on a Cobalt SS mind you)

BrianNutter > Nick, Drives a Cobalt LT
07/13/2014 at 17:08

any spark or injector firing (check with noids) at all? If not maybe a crank/cam sensor?

Nick, Drives a Cobalt LT > BrianNutter
07/13/2014 at 17:32

Could be crank, I am getting fuel and spark, I have tested this multiple ways.

Nick, Drives a Cobalt LT > Vince-The Roadside Mechanic
07/13/2014 at 17:32

Dealer will refuse......They also will charge out of the ass.

Nick, Drives a Cobalt LT > erikgrad
07/13/2014 at 17:33

Checked the TB, its electronic, it opens properly and closes properly, I physically tested it with my hand as well as witrh a scan tool

Nick, Drives a Cobalt LT > 04sneaky - Boxers. Blowers. Bikes. And bitches.
07/13/2014 at 17:34

Does the same with either key, everything powers up, starter turns just fine, cranks, but never fires, will almost seem to fire off but never actually does.

Nick, Drives a Cobalt LT > Twingo Tamer - About to descend into project car hell.
07/13/2014 at 17:34

Come see the car haha Visit my hell

Twingo Tamer - About to descend into project car hell. > Nick, Drives a Cobalt LT
07/13/2014 at 17:36

I have enough to deal with myself without diagnosing electronics haha. Got a CV boot and new bleed nipples to go on a car this week. Then some rust repair soon too.

04sneaky - Boxers. Blowers. Bikes. And bitches. > Nick, Drives a Cobalt LT
07/13/2014 at 17:48

I'd almost agree with the cam/crank sensor then. I've never worked on any Chevy 4-bangers, but pretty much any other manufacturer seens to eat those over time. If you're getting fuel, spark, and air then something is just not letting them fire at the same time.

Vince-The Roadside Mechanic > Nick, Drives a Cobalt LT
07/13/2014 at 18:04

WTF Dealer?

BrianNutter > Nick, Drives a Cobalt LT
07/13/2014 at 21:40

If you are getting fuel and spark something is triggering at least. Are there both a cam and crank sensor on that engine? Does it even try to start or just crank over? You verified fiel rail pressure?

deekster_caddy > Vince-The Roadside Mechanic
07/14/2014 at 00:36

under his hood is pretty heavily altered from stock. A dealer wouldn't take the job, at least not by a book rate job.

deekster_caddy > BrianNutter
07/14/2014 at 00:38

i'm down with these suggestions - something isn't letting the spark fire at the right time, which points to cam or crank sensor.

I have seen a particular GM model that would have the cam sensor's wire get brittle and break inside the insulation, so there was no visible break, yet on multiple vehicles the same wire was bad.

Vince-The Roadside Mechanic > deekster_caddy
07/14/2014 at 09:07

That is what I thought because not many know how to work on an Opel motor.

BrianNutter > deekster_caddy
07/14/2014 at 10:00

best of luck!

Nick, Drives a Cobalt LT > BrianNutter
07/14/2014 at 11:27

Rail pressure is proper 500psi and stuff. Even when the engine does fire it runs the 3 thousand psi it wants and needs.

I'm going to go and target the crank and cam sensors. The odd thing is those are all fairly new, the harness is the original harness, so more than likeley it is the harness that is fucked up.

BrianNutter > Nick, Drives a Cobalt LT
07/14/2014 at 12:26

yep hopefully you find a pin dislodged

Nick, Drives a Cobalt LT > BrianNutter
07/14/2014 at 19:39

I found out my ECM connector is filled with oil......so.....fun.....

BrianNutter > Nick, Drives a Cobalt LT
07/14/2014 at 21:03

hope thats it.

Nick, Drives a Cobalt LT > BrianNutter
07/14/2014 at 22:07

As far as where the oil is? I hope so too....just how....