Car will not start

Ok do thinh I have a bougth bad fuel pump? If so let me knowe and Thank's for your support. Have a Goodnight!

The engine size is a 3.2 V6: iT IS POSSIBLE IT IS A BATTERY CONNECTION, BUT THERE IS NO CORRISION AND THE CABLES LOOK LIKE THEY ARE IN GOOD SHAPE. THE STARTER IS NEW AND HAS BEEN TESTED.

Thanks

The engine has compression so I am kind of stumped here. It had two codes a p0121 and p0221 tps sensor. Could a faulty tps cause it not to start, I would think it would just cause erratic rpms and overall rough running but would still start. What's your thoughts?

The vehicle is a 2003 CTS. The battery is under warranty at Batteries plus. I had them check and watched. I went to autozone and had checked it
with there tester. I went to Advance and they checked it. I tried to
recreate the situation thinking it might be the batterry connection.
I turn the car on and wiggled the cables going to the battery to see if
I could verify there was a loose or broken connection. I could not.
I would think it could be the starter, but the problem was there before
I put the new starter on. Like I say it is intermittent and occurs when
the car is shut off and then I try to recrank without letting it sit to cool. This is why I changed the starter relay. My guess it has to be an electrical connection or the crankshaft position sensor. I did not see
any loose wires or frayed wires when I took the covering off the key ignition in the interior. The only code I have is for an O2 sensor.

Thanks for your response I should be able to recheck compression tomorrow along with the timing belt. I also am going to verify that I have injector pulse while I am there. Tps sensor doesn't make sense to me either just wanted to let you know what codes were on history of computer.

Well I had a chance to check compression and it was good numbers on cylinder were 145 155 180 175 150 and 135. I removed drivers side valve cover and checked timing links on chain in reference to cam sprocket and the flat spots on rear of cam that the book said. So I decided to remove front cover and see if it slipped. After I got cover off I lined up crank reference points and noticed the marks lined up.

The camshafts were lined up correctly on top so I proceeded to the other chain on right side and links also in right place and camshafts were in right position. So what I concluded was someone must have put a chain on this car before and timed cams to crank and just replaced the chains. I understand that this will work since a link is a link but it made it very confusing for the next guy which is me to work on. So long story short I still have a no start I can't figure out thanks.

I was using a Chilton book and all data as references for diagrams. I am pretty sure at this point that timing is correct. I will try the crankshaft sensor, I guess its the only thing left that's easy.

I have GREAT NEWS! The sensor fixed it, I cant believe it after everything I have been through. :) I love this site

Thanks again!

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