Tthorrr

I jacked up each wheel of my C5 corvette to see if there were any wheel "binding Issues" ( that's a different issue, traction control problem I've been trying to solve) But when I took it off the jacks it will not start. It turns over but acts like it's out of gas. Yes, I added 2 gallons of gas. It's an automatic, any ideas where to “start?”

tentuna

Do you see any messages in the DIC?

mmartinez

First thing to check is fuel pressure on the schrader valve on the fuel injector rail, should be around 50psi, are you hearing your fuel pump prime for 2 seconds when you turn the key to the ON position, and do you see the tachometer move while it's cranking?

Tthorrr

Yes, Thank you for your time. There are 11 other codes under the TCM just with the letter H after & 2 under PCM with the letter H. I didn't add those because I believe they to be (History) If I should add them, Or "Clear" them, please let me know.
PCM
P0141 C
P0335 C / H
TCS
C1241 H / C
C 1286 H / C

Tthorrr

I do hear the fuel pump, there's fuel in the rail. The tachometer does not move while it's turning over. I haven't measured the pressure yet. I'll get that done now

feeder82

P0335 is the crank position sensor, if that fails you have a no start situation

Tthorrr

I do not have the gages to check the Schrader valve I will have access in a few hours. Borrowing a friend's HVAC Gauges. I really appreciate everyone’s time here. I don’t want to waste any but, I may be leaving out important pieces of this puzzle by not getting into why I had a jack & was spinning the wheels of my C5 in a parking lot. This “Not Starting Issue” is brand new & seemed it must be directly related to jacking each wheel up & individually spinning them. Is there a kill switch? A fuel fuse? Anything I may have just tripped by doing this? It seems so unrelated to the issues I have been trying to repair with this car. let the final wheel down off the jack tried to start the car & it just keeps turning over but won't start? But I think I should give you folks a little more background in case it (IS related) to this issue.1st mileage, my C5 has 162,000. For a couple years I've been dealing with a periodic check engine light, "Traction Control light, then The DIC started reading “Service Traction Control System & Service engine soon on the DIC. The engine has cut power by ( two thirds or so?) The DIC reads reduced engine power. On the Passenger side, I found the wheel bearing was bad, this is three days ago (10.5.2020). Also, the sensor wire had worn through on that side. I replaced the front brakes (Ceramic) & the Hub, Moog. I turned the key & NO check engine light - No Traction Control light- No Service Traction Control System reading on the computer. The computer did still read "service engine soon". I am a genius!

I went for a 15 to 20-mile ride to check things out & it ran Great! When I came out of the store & started the car ALL the lights came on immediately. I thought maybe a brake was hung up or something. So there in the parking lot, I jacked up each wheel & gave them a spin. ( Yes, I brought my jack & all the tools I had been using). I didn't hear any grinding at any of the wheels & front wheels spun around 3/4 turn or so, the rear about 1/2 turn. I decided to go home & have a deeper look at each wheel. When I took it down from the jack & turn the key, the C5 will not start. Turns over like a champ but will not start. Genius to Lost POC, in an hour's time. That's the short long story of how I am here. I hope you guys can understand how much I appreciate your help.

feeder82

That P0335 crank position sensor code current/ history means it's on the way out. It will not fire, but will turn over with a bad crank sensor

C5 Diag

No Tach movement is a sign it’s the crank sensor...you can check for no spark and no injector pulse to verify...all you need is a 12 volt test light to check for injector pulse !!

Tthorrr

Thanks again, everyone !! Crank position sensor it is. I have No Spark, I'm on my way to pick it up.

jjc508520

Could a CPS contribute to a "slow start when cold" as well as a no-start - or is this a binary deal?

Fired mine up this morning to enjoy the beautiful Fall weather - and it spun for a bit before catching.

Thanks for the observations regarding the tach

Tthorrr

Gentlemen thanks again, one more thing... Where is the crank position sensor located in a C5? I have the part, I can't find where it goes. nothing on youtube & this forum listed 387 responses to the question; " Where is the crank position sensor in a C5?"
Mr. jjc508520 - One of the many things I've learned the last couple of days, Are there any codes on your DIC? (P0335) most likely the CPS is on the way out.

Fastguy

It's right above the starter.

feeder82

Yup, unfortunately it's not a easy swap. Drop the exhaust remove the starter to access. Oh don't forget to disconnect the battery

Tthorrr

You guys rock !! It's in, Once everything's put back together I'll post the good news that it made it. If I don't, ..It didn't & I didn't either...

Tthorrr

Off the jacks about 10:00 tonight, turned the key & it turned over great, no start. I'll recheck my work tomorrow. Thanks again.