redfishsc
Tired of fixing lousy engineering.
Amidst all this sinus infection I've been trying to get this truck to start. I'm stumped--- this isn't the first head gasket job I've done on this generation 5.7.
This is a 99 Suburban... one of the two I own. I did this same job to the other one last year, didn't run into this issue. I'm sure it's something I've done wrong or overlooked.
After everything was bolted together, I was able to crank it but it ran TERRIBLE (misfires, but no backfires). Assuming I had the distributor installed wrong, I pulled it and reset to TDC compression #1 following http://www.gmtruckcentral.com/articles/distributor.html
After reinstalling the distributor, it wouldn't even fire. Felt like either no spark or no fuel. At that point the sinus infection won the day and I shut down the garage for the week.
So here is where I am at now:
The only two things I currently can think of:
Tomorrow I will check again that the truck is on TDC #1 compression with the distributor in the right position. If that doesn't work, should I pull the valve covers and back off each nut by about 1/2 turn, which would put me back to the normal factory spec of 3/4 turn past 0 lash?
This is a 99 Suburban... one of the two I own. I did this same job to the other one last year, didn't run into this issue. I'm sure it's something I've done wrong or overlooked.
After everything was bolted together, I was able to crank it but it ran TERRIBLE (misfires, but no backfires). Assuming I had the distributor installed wrong, I pulled it and reset to TDC compression #1 following http://www.gmtruckcentral.com/articles/distributor.html
After reinstalling the distributor, it wouldn't even fire. Felt like either no spark or no fuel. At that point the sinus infection won the day and I shut down the garage for the week.
So here is where I am at now:
- Cyl heads are both fresh remans from a reputable machine shop.
- Battery is charged.
- Plugs, wires are new Delco. Dist cap is Delco, clean, 6 months old.
- Plug wires are to the correct cylinder.
- Ignition coil/control module works properly (I removed it and put it in my other truck, which ran fine).
- I've checked for missing connectors.
- Fuel injectors aren't mis-routed. I was careful to follow the included guided and double-check my work before installing intake.
- Fuel injectors seem to be working--- I get fuel in the cylinders if I pull the plug but leave the fuel pump powered up.
- Distributor was set to TDC compression #1, although tomorrow I'll go re-check it.
The only two things I currently can think of:
- Bad valve adjustment? I installed brand new lifter (Enginetech brand) and they said to adjust them 1.5 turns past 0 rod lash. That sounded kinda harsh to me so I did 1.25, which I am suspicious was STILL too much.
- Compression on all 8 cylinders ranges from 148-158. I'm glad they are consistent but it seems low.
Tomorrow I will check again that the truck is on TDC #1 compression with the distributor in the right position. If that doesn't work, should I pull the valve covers and back off each nut by about 1/2 turn, which would put me back to the normal factory spec of 3/4 turn past 0 lash?