tig488

2014 Sierra AT. 146k miles. Had engine rebuilt 14 mos ago from lifter failure. Has been even fine since then. About 6 mos ago it started sporadically not starting. I’d say once every few weeks I get in and turn it over and it acts like the battery is dead. I get a click but no start. I try again immediately and it starts. Once it cranks I get the “theft deterrent system” dash light on the dash and I have to clear it, and the alarm cel goes away after a few cranks. a few weeks goes by and it does it again. Battery has been tested and is good. it has also done it when I try to do remote start. leaning towards replacing the starter. any thoughts?

Yes. The mechanic put the new solenoid in but didn’t plug it up. Had to pull the front plate off again and plug it up. After that it was fine.

sorry but the oil pump solenoid is not a simple job. the part is cheap, only $15 at rockauto.com but requires a lot of work. its around a 4-5 hour job. all fluids drained, front engine cover off. its not an hour job. I was having the code but also had a lifter explode. I had the dod delete kit installed and a new oil pump and solenoid installed at the same time.

I just had my engine rebuilt due to a NON-DOD lifter detonating. all the DOD lifters looked fine after 125000 miles. did a delete setup.

Stock suspension $25

stock 20 snowflake rims mounted on Nitto Ridge Grapplers, 295/60s. $1300, buyer pays shipping, will meet if local. stock air box assembly $30 stock Bose speakers(6) $50 summit white front bumper cover $free located in Birmingham Alabama.

and you didnt put any kind of inline filter or catch can before the brake booster?

what he said.

that was my first thought but I don't want to risk oil getting in the brake booster.

that's risky, if you mess up that manifold that's an expensive replacement, plus id be afraid of small pieces of plastic getting trapped then sucked into the engine.

pm inbound.

recently had motor rebuilt due to lifter failure, gonna do a vacuum pump delete since DOD is gone. was gonna run the brake booster to the intake manifold port that usually goes to the PCV for vacuum but not sure where to get vacuum for PCV. I was considering just putting it to a catch can without vacuum, or another option is a TB spacer with a side port to supply vacuum for the brake booster and leave the PCV where it is. any thoughts?

yes, just did it.

I would suggest replacing a few more parts while you're at it. the intake manifold needs 8 new gaskets, id also replace the timing chain and tensioner, new water pump gaskets, new cam bolt, front main seal, fuel pump gasket, harmonic balancer bolt, and both fuel lines under the manifold.

update, got the truck back runs great. quiet again. one issue, my oil pressure is on the high side so he ran a diagnostic and its showing a po6DA. I was getting a po6DD before that's why I replaced the oil pump and solenoid. this code means the solenoid is stuck open causing pressure to be high. by my gauge it shows around 50-60 but his reader shows it spikes up to 70-80 under heavy throttle. we think it might be a wire issue because the code shows up on his scanner with the key on without it running, but my truck doesn't show a CEL.