Please help
Thread Starter
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Joined: Feb 2022
Posts: 70
Likes: 18
Please help
I am at a loss. I did a new intake manifold 2 weeks ago and haven’t been able to get the car to start. Originally I could get it to crank and had a few cylinders fire but that’s all I could get. I checked the Schraeder valve and had fuel come out but haven’t put an actually pressure valve on it which I’m now considering. Checked my fuses and relays and everything looked good. Put a OBD2 reader on it and just had codes from not having cats. Charged my battery for a while and got a multimeter on it and it read 12.2V. Put the battery back in the car and it read 10.8V. Gave it a jump start to see if that might do it but now the car won’t even crank. Just get a click. I don’t know what to even do anymore. Anything helps
Update: I found a mouse nest. Thinking I might have some electrical issues now. Great
Update: I found a mouse nest. Thinking I might have some electrical issues now. Great
Last edited by mnorth04; Aug 17, 2024 at 07:48 PM.
Safety Car
Joined: Aug 2017
Posts: 4,905
Likes: 2,308
From: Etobicoke (Toronto) Ontario
Your battery is dead @ 10.8 V. With that voltage, it sounds like one of the cells is shorted since each of the 6 cells is supposed to contribute 2.1 V. First step is to get the battery tested to be sure, and then replace it with a good one. I think the 12.2 volts you were reading was the surface charge on the remaining 5 cells. That would have bled off by the time you got the battery back in and hooked up. I don’t know if a boost could overcome that dead cell in parallel.
Drifting
Joined: Apr 2021
Posts: 1,928
Likes: 1,125
From: Peoria, AZ
2023 C6 of the Year Finalist - Modified
Battery first.....also check the ground under the battery and make sure it's clean......probably, while your at it, check the connections on the starter for cleanliness. Let us know what you find!!
Thread Starter
Advanced
Joined: Feb 2022
Posts: 70
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Alright, I changed out the battery and checked the grounds under the battery tray. That got off the service lights and makes me believe that I don’t have mouse issues. The car will crank but not start. I can hear one or two cylinders fire but that’s all I get. Any tips?
Racer
Joined: May 2024
Posts: 404
Likes: 309
Fuel rail pressure normal range is 55-62 psi. Put a gauge on it and verify first.
If fuel pressure is too low, then start looking at the fuel pump and relay.
If it has fuel pressure and it cranks, then spark is next to check. You check all the coil pack connections?
If fuel pressure is too low, then start looking at the fuel pump and relay.
If it has fuel pressure and it cranks, then spark is next to check. You check all the coil pack connections?
CF Community Team
Joined: Apr 2016
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From: Pittsburgh
2025 C6 of the Year Finalist - Unmodified
2024 C6 of the Year Finalist - Unmodified
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Post #6 should help you
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Racer
Joined: Dec 2018
Posts: 483
Likes: 199
From: Wisconsin
2023 C6 of the Year Finalist - Unmodified
If the car ran before you took it apart then it likely something not reinstalled correctly. Check any wiring connections that you had apart .Make sure that the intake gasket is seated properly.