V1 Donor Help - Cobalt SS wont start but cranks - Thoughts?

[BaltimoreHokie]

I had the manifold off because of a fuel leak that I fixed. Before I found the leak it wouldn't turn over. So I replaced the starter and fixed leak. Didn't want to put it back on unless it cranked over and the fuel leak was gone. It didn't crank and since I was still possibly testing the starter I didn't want to bolt it up. I hooked up the sensors to the intake manifold and still the same result. Won't crank w out jumping the relay.

 

[Briann1177]

So you jumped the crank relay while your wife cranked it over and it idled for a bit?

 

[BaltimoreHokie]

So you jumped the crank relay while your wife cranked it over and it idled for a bit?

Yes. But basically right after it was running I had her turn it off prob no more then 4 seconds idling. Tomorrow I'll put the manifold on. See if I can crank it over again and see if there are any other issues.

 

[Briann1177]

Sounds like you're getting close to pinning it down.

 

[BaltimoreHokie]

Yeah. It wasn't running when I got it so I wanted to see if the work I had completed fixed the issue. Now. Just to figure out this clutch issue. Thanks for your help. Wouldn't have gotten this far without it.

 

[Briann1177]

Try swapping that relay out. You should be able to swap it out with a relay from an unused circuit like wiper on/off or rear defog.

 

[BaltimoreHokie]

Yeah. I've tried that...always the same result. Wont turn the starter. Its like whatever tells that relay to open is not happening.

 

[Briann1177]

I guess you could also measure the output resistance of the clutch sensor. I measured mine and it was like 1.4k Ohms with the clutch pedal all the way up, and 3.4k Ohms with it fully depressed. Or it might be the other way around. I forget. The resistance should smoothly change as it's pressed/released.

If you have multimeter leads with alligator clips, you can attach some sewing needles to the clips and gently insert them into the ECM connector. Then have your wife slowly depress/release the clutch and watch the resistance values.

You can also measure resistance on the black/purple, body-to-engine harness connector. Which ever way is easier. From my understanding, the clutch sensor is a huge PITA to get to be able to measure directly.

 

[BaltimoreHokie]

I didn't get around to finding out why the relay wasn't working but I did put the intake manifold back on. It seems to be running pretty good I took it for a drive around my subdivision and got into boost briefly. I can see why they use these cars. It seems pretty fast. I did however hear what sounded like a tick coming from the engine bay. I took a video. There are two different ticks that are going on. One sounds like a lifter tick. The other one I am not so sure about. You can hardly hear it in the video.

Here is a video

Do you know if that is for sure from the lifters? Or. What the other tick is?

 

[Briann1177]

Do both of those sounds increase in frequency when you increase engine speed?

 

[BaltimoreHokie]

No. After some research on cobaltss. Sounds like the non lifter ticking is from the fuel pump. Basically this....

http://www.yourcobalt.com/forums/#/topics/20956

As for the other tick. The one that sounds like lifters. That one seems like when it's at a higher rpm it goes away. Or is less noticable.

 

[ctuinstra]

So did you start it by jumping the relay or is it starting normally now?

 

[BaltimoreHokie]

So did you start it by jumping the relay or is it starting normally now?

Jumping relay only. Won't crank otherwise.

 

[BaltimoreHokie]

Do both of those sounds increase in frequency when you increase engine speed?

It does increase when your around 1.5-2k. After that. It's hard to tell for sure if it goes away.

 

[Briann1177]

I was thinking it could be the high pressure fuel pump too. As far as lifter tick, it could be fixed as easily as changing the oil. Probably won't, but you never know.

 

[BaltimoreHokie]

I was thinking it could be the high pressure fuel pump too. As far as lifter tick, it could be fixed as easily as changing the oil. Probably won't, but you never know.

It has brand new oil....5 quarts of mobile 1 5w-30....maybe since I had the head off they need to be in there a little longer and soak with oil. No way I feel like taking off the came to replace the lifters.

 

[BaltimoreHokie]

I'm thinking I may have found the issue. Anyone know what this ground goes to? I am not home to test it but I was looking at the pictures and am not sure if I connected it.

 

[Briann1177]

I'm pretty sure it goes to the transmission side of the head.

 

[BaltimoreHokie]

I'm pretty sure it goes to the transmission side of the head.
View attachment 2284

Yeah. I bet that's my problem. When I get home I'll report back.

 

[Briann1177]

Are you going to put new valve train parts in while you have the head off?