06 c70 rebuilt engine now no start?

tonySWFLC70 · Post by **tonySWFLC70** » 07 Oct 2020, 17:00

Help,

I did a full rebuild on engine (wife knocked hole in pan and drove it) . Everything is back in minus some covers. As car won't start! Cranks but no start. Only engine code I am getting is a a ECM 126C Turbo pressure. I am also getting a few CEM codes. I did remove CEM and reconnect all connections and removed all fuses and replaced. Incase of poor connection. No visual issues were spotted.

I also test and for the heck of it replaced Crank sensor. Car sat about a year (teaching wife lesson), while the rebuild was going on. I double checked all connections to ECM, and main ground and spark ground under cover. all seem good and read very low ohms to negative terminal. Battery is brand new and tested with a jump as well. Key works Radio plays etc.

Please give me pins and voltage to check for spark circuit. I only have a DIY membership to all data. But am considering a pro upgrade. I was a Master cert ASE mechanic back in the day. So not much above my level of experience.

Thanks
Tony

Post by **kallekula** » 07 Oct 2020, 17:51

Do you have fuel pressure?

Post by **RickHaleParker** » 08 Oct 2020, 00:14

Sometimes the ECM is expecting the conditions that where before. Disconnecting the camshaft sensors and staring the engine will force the ECM to rethink the start. After you get it started, turn engine off and reconnect the camshaft sensors. Then start engine again.

Could be lawn mower syndrome. Squirt some about a tablespoon of oil in each cylinder and try again.

tonySWFLC70 · Post by **tonySWFLC70** » 08 Oct 2020, 15:09

Sounds like a great recommendation. Next on list. Might be Saturday, between work and heat here. But will let you all know how it goes.

Thanks for the very speedy reply that seems very valid.

Tony
Previous ASE Master Certified Auto Tech Gone Rouge and now a IT geek going Rouge and selling Yachts!

tonySWFLC70 · Post by **tonySWFLC70** » 11 Oct 2020, 06:05

Ok tried that no go, same. Removed and replaced plugs checked compression all good. Added dry gas and 7 gallons fresh hi-test

Still cranks no start. Uggs

Disconnected all body grounds cleaned and reconnected.

Working to remove and check fuse panel in engine bay and clean and check all connections.

Any other tips greatly appreciated

tonySWFLC70 · Post by **tonySWFLC70** » 12 Oct 2020, 06:06

Ok update, after chasing every rabbit I could think of and those from this group. I went back to basic's and discovered the timing belt had jumped time. Redid the timing belt positioning and vrrmm she started right up. I know it was right and even turned her over by hand to ensure all was good. Maybe when I put the impact socket on the Crank nut? Either way she is now running though I do have a minor oil leak. Not sure I tightened the Turbo Oil supply line at turbo, uggs. Back under her I go soon.

Thanks to all in this group for the tips, and assistance.

Will keep you posted. Just goes to show the old rule keep it simple stupid still holds true. Don't forget to check the simple basics when encountering a issue.

Tony