V1 LeoZug's Montana Street Goblin - '05 Cobalt SS donor

[Traé]

The body to engine plug is wired into the main harness, it should be near your fuse box.

 

[Leo Zugner]

Oh man! Huge step I think! Found the plug h see the throttle body! Man it was buried. Now when I turn the key to ACC I get a click near the engine and when I push the gas pedal I get a click. When crank, it sounds like I get one fire and it stops. Almost like a signal gets sent to stop for some reason. I can’t thank you guys enough for all the help. I know I’ve been a pain. Just this progress tonight had me floating. I need to figure out how to get it fully running!

 

[comegetjoe]

Oh man! Huge step I think! Found the plug h see the throttle body! Man it was buried. Now when I turn the key to ACC I get a click near the engine and when I push the gas pedal I get a click. When crank, it sounds like I get one fire and it stops. Almost like a signal gets sent to stop for some reason. I can’t thank you guys enough for all the help. I know I’ve been a pain. Just this progress tonight had me floating. I need to figure out how to get it fully running!

One fire? Elaborate.
Like 2 seconds of run time? or runs up and then quickly shuts off? Or?

 

[Leo Zugner]

Seems almost like it’s turns over and fires once but then that’s it. It’s hard to tell I guess. I’ll get a vid of it happening in the morning and send it. Thank you all again.

 

[Leo Zugner]

Ok so I tried again this morning. When I turn the key to ACC I get the butterfly in the throttle body flapping open then closed, and when I push the throttle it opens and closes every time. So that’s good! When I crank I still only get what sounds like one, maybe two combustions but then it stops. If I hold the clutch in I get a mechanical clunking sound that is maybe the starter still trying to engage? It all happens quick so it tough to pinpoint. I have a vid but I can’t post it.

 

[Traé]

have you tried jumping the car with another vehicle? Could just be your battery.

is all of your dash and the front of the car hooked up? Minus lights, those will not make a difference. You will need the cluster, powersteering, and ignition/VATS hooked up.

Also, could try banging on the starter with a rubber mallet while trying to crank. It might be going out.

 

[Leo Zugner]

I’ve had the battery on a trickle charger so I don’t think that’s it. I don’t have most of the dash buttons hooked up like cruise, data reset, cuz I wasn’t going to use them.

Most of my codes are gone but I still have these:

P0230 Fuel Pump Primary Circuit Malfunction
P0452 Evaporative Emission Control System Pressure Sensor Low Input
P0141 Oxygen Sensor Heater Circuit Malfunction (Bank 1 Sensor 2)

I think the 141 code is new.

 

[Traé]

I would be worried about P0230.

Here’s some info and more stuff to look into.

P0230 — 2005 Chevrolet Cobalt L4-2.0L SC VIN P Service Manual | Operation CHARM

Detailed repair manual for the 2005 Chevrolet Cobalt L4-2.0L SC VIN P.

charm.li

P0452 and P0141 are irrelevant and could be turned off in HP Tuners if you have it or ever get it.

 

[Leo Zugner]

Interesting. I had 230 code with my oem ‘05 fuel pump and the new oem ‘06 fuel pump. Sounds like it’s more in the computer than with the pump?

 

[Desert Sasqwatch]

Or fuse or relay or connector contacts or wiring or LAN loop continuity/resistance value or...there are many things that could be wrong before blaming the ECM.

 

[Leo Zugner]

I’ll start checking things off.

 

[Dale E]

Leo, grab a stool and go sit in the garage. You and the Goblin. Look, feel, talk to your Goblin and yourself, think, ponder, trace in your mind the steps you've taken and where you started, and how you got to where you are. In quietness, relax. Now, walk away for a few hours, a day, then come back.

Just thoughts from an outsider, non builder!

 

[Leo Zugner]

Haha. Appreciate it. I want to get this thing moving before our very long Montana winter starts. Or I’ll be waiting another 6 months to drive it. I’m already 7 months into this build.

 

[comegetjoe]

Or I’ll be waiting another 6 months to drive it. I’m already 7 months into this build.

7mo ain't nothing. Took me 2.5 years to first drive.

 

[Leo Zugner]

Yikes. Bought it to drive. DF told me 100 man hours to build. Not quite.

 

[Leo Zugner]

Can anyone confirm that my fuel pump fuse is in the right spot? It can also go in the spot right next to it and the diagram in the cover is a little vague.

 

[Traé]

Can anyone confirm that my fuel pump fuse is in the right spot? It can also go in the spot right next to it and the diagram in the cover is a little vague.

the 15 amp needs moved down next to the 10 amp and the fuel relay needs moved down one spot.

 

[Leo Zugner]

Holy %*!*! That did it!!!!!!
THANK YOU!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

 

[Leo Zugner]

I can’t thank you all enough.

Next question is that I need to bump the gas here and there to keep it running. also just got a low fuel notice but I do t think that’s right. Said I had 3/4 tank which also seems high.
Gonna try to take the car to a local shop that worked on the cobalt to see if they can tidy all the computer stuff up.

 

[Traé]

I can’t thank you all enough.

Next question is that I need to bump the gas here and there to keep it running. also just got a low fuel notice but I do t think that’s right. Said I had 3/4 tank which also seems high.
Gonna try to take the car to a local shop that worked on the cobalt to see if they can tidy all the computer stuff up.

This is more than likely able to be smoothed out with tuning, either taking it somewhere or buying HP Tuners and doing it yourself. I had erratic idle and random shut offs when first running the engine too.

I will say buying the HP Tuners MPVI and learning myself was a great experience and taught me a lot about the inner workings of it all, it was nerve racking at first but with research and a little confidence it can be done.

Look into getting a wideband setup if you’re going to do any tuning yourself, also a great thing to have just to monitor.