New build disaster. Need help please
#1
New build disaster. Need help please
I hope this is right section to post. I'll keep it short but give important details. My 02 Silverado motor was checking out, so i built a new one. Got from junk yard , took to machine shop for cam bearings, bore .020 over, heads leveled and valve job, polished crank. I bought a book on assembly and put it together as instructed, plastigage everything, tried to do it right. Put in a btr truck cam, long tube headers and cold air intake. Swapped into my truck, and now I have a problem . The truck won't idle, stalls out and runs real choppy. Now once your going down the road it runs awesome, but as you slow down it dies and will barely idle at stop light. Oil pressure goes way down at idle and motor just quits. I pulled oil pan back off and put another be o ring on pick up tube just to make sure. Any ideas? Once again, won't idle, oil pressure drops and it idles real choppy and quits. Showing no codes . Please help
#2
ModSquad
iTrader: (6)
Have you had the truck tuned for the new engine?
#3
I am at s loss , was thinking about going back to factory air box to see if that helps, then back to factory cam if needed. I think it's probably something minor because it runs great under acceleration. Could torque on rockers be off
#5
ModSquad
iTrader: (6)
#6
#7
TECH Senior Member
iTrader: (4)
Hopefully, a moderator will see this and move the thread. It will probably get more replies from experienced engine builder's in the Gen 3 Internal Engine section.
Edit Chevelle responded, he's one of the experts
What's the oil on the dips tick look like?
Might be wise to change oil and filter. It's really best to do that almost immediately after the first heat cycle on the engine. Filters can quickly clog after a rebuild with all the assembly lube etc. That could effect oil pressure.
Pull the oil filter and cut it open and check the filter element and see whats in it. Take pictures to post so the experts can help if you find anything in the filter element.
Post pictures of the oil and filter element.
Probably help to post the cam specs and any other modification details. Was the truck tuned along with the cam?
Regarding low oil pressure, might try attaching a mechanical gauge to see what the actual oil pressure measures. I've had random drops and spikes on the dash oil pressure gauge when an alternator was failing. Headlights would pulse etc car had a shimy/surge. I doubt an alternator is the issue but sometimes oil pressure sensors go bad or get damaged during R&R etc.
Edit Chevelle responded, he's one of the experts
What's the oil on the dips tick look like?
Might be wise to change oil and filter. It's really best to do that almost immediately after the first heat cycle on the engine. Filters can quickly clog after a rebuild with all the assembly lube etc. That could effect oil pressure.
Pull the oil filter and cut it open and check the filter element and see whats in it. Take pictures to post so the experts can help if you find anything in the filter element.
Post pictures of the oil and filter element.
Probably help to post the cam specs and any other modification details. Was the truck tuned along with the cam?
Regarding low oil pressure, might try attaching a mechanical gauge to see what the actual oil pressure measures. I've had random drops and spikes on the dash oil pressure gauge when an alternator was failing. Headlights would pulse etc car had a shimy/surge. I doubt an alternator is the issue but sometimes oil pressure sensors go bad or get damaged during R&R etc.
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#9
11 Second Club
iTrader: (3)
I hope this is right section to post. I'll keep it short but give important details. My 02 Silverado motor was checking out, so i built a new one. Got from junk yard , took to machine shop for cam bearings, bore .020 over, heads leveled and valve job, polished crank. I bought a book on assembly and put it together as instructed, plastigage everything, tried to do it right. Put in a btr truck cam, long tube headers and cold air intake. Swapped into my truck, and now I have a problem . The truck won't idle, stalls out and runs real choppy. Now once your going down the road it runs awesome, but as you slow down it dies and will barely idle at stop light. Oil pressure goes way down at idle and motor just quits. I pulled oil pan back off and put another be o ring on pick up tube just to make sure. Any ideas? Once again, won't idle, oil pressure drops and it idles real choppy and quits. Showing no codes . Please help
#12
ModSquad
iTrader: (6)
#14
Staging Lane
Take it from me, you will need a tune, I did the truck norris cam from BTR, and IT WILL NEED to be tuned.
Wow, this just came up again, didnt even realize I replied to a 5 year old thread.
OOOOPPPPSSSS
Wow, this just came up again, didnt even realize I replied to a 5 year old thread.
OOOOPPPPSSSS
Last edited by Crasteal; 02-15-2024 at 11:01 AM.