Siggertx
Newbie
Hello everyone, first post here. Looks like there is some pretty in depth information on this forum along with some knowledgeable members so I figured I'd see if someone can help me pin point this issue. This will be a long read but I'm going to try and give as much info as possible.
The truck is a 96 1500 5.7, purchased two days ago in a semi-running condition. Gal I got it from had been taken by a mechanic and she bought a new car. The truck would start right up if you put a little gas in the TB, idled pretty good, and would do 70mph if you really eased into it. If you gave it too much throttle it would stumble and die. One of the repairs that had been made was a replacement fuel pump that seemed very noisy to me. Before I tore into the truck I tested the pressure: 15psi with key on, 50psi at crank and run. Trouble codes show banks 1 and 2 too lean.
I noted that the lower intake was leaking coolant, no coolant in oil or oil in radiator. Plugs had been changed, white ash color (figured coolant perhaps). I proceeded to tear down the intake, replaced gaskets and bolts (corroded), cleaned everything up real good. Also had to replace the distributor due to the "mechanic" breaking the ears on the original installing new cap.
Put engine on cylinder 1 TDC, and I adjusted valve lash using this method: Adjust intake 1, 2, 5, 7, and exhaust 1, 3, 4, 8. Rotate the crank 360 degrees (putting #6 on tdc) and adjust intake 3, 4, 6, 8, and exhaust 2, 5, 6, 7. What I do is with the rocker obviously loose, I spin the pushrod as I tighten the rocker nut. When zero lash occurs, the pushrod will momentarily stop spinning. I then tighten the rocker nut an additional 1/2 turn.
After reassembly the truck won't start, cranks good but no fire. I verified timing and order, checked compression on all 8, all plugs are sparking. Tried a little gas in the TB, eather shot on the filter. I didn't have access to the fuel pressure gage last night but by pressing in the valve it appears to be operating in the same condition. I'm picking up a new AC Delco pump this afternoon, but I don't expect it to fully cure this problem as it would run with the old pump. I've been over this think 10 times checking electrical plugs and hoses (all were labeled during process). Hasn't thrown a code yet. I think that's pretty much it. I'm stumped here, anyone have any thoughts to share? I'd sure appreciate the help!
The truck is a 96 1500 5.7, purchased two days ago in a semi-running condition. Gal I got it from had been taken by a mechanic and she bought a new car. The truck would start right up if you put a little gas in the TB, idled pretty good, and would do 70mph if you really eased into it. If you gave it too much throttle it would stumble and die. One of the repairs that had been made was a replacement fuel pump that seemed very noisy to me. Before I tore into the truck I tested the pressure: 15psi with key on, 50psi at crank and run. Trouble codes show banks 1 and 2 too lean.
I noted that the lower intake was leaking coolant, no coolant in oil or oil in radiator. Plugs had been changed, white ash color (figured coolant perhaps). I proceeded to tear down the intake, replaced gaskets and bolts (corroded), cleaned everything up real good. Also had to replace the distributor due to the "mechanic" breaking the ears on the original installing new cap.
Put engine on cylinder 1 TDC, and I adjusted valve lash using this method: Adjust intake 1, 2, 5, 7, and exhaust 1, 3, 4, 8. Rotate the crank 360 degrees (putting #6 on tdc) and adjust intake 3, 4, 6, 8, and exhaust 2, 5, 6, 7. What I do is with the rocker obviously loose, I spin the pushrod as I tighten the rocker nut. When zero lash occurs, the pushrod will momentarily stop spinning. I then tighten the rocker nut an additional 1/2 turn.
After reassembly the truck won't start, cranks good but no fire. I verified timing and order, checked compression on all 8, all plugs are sparking. Tried a little gas in the TB, eather shot on the filter. I didn't have access to the fuel pressure gage last night but by pressing in the valve it appears to be operating in the same condition. I'm picking up a new AC Delco pump this afternoon, but I don't expect it to fully cure this problem as it would run with the old pump. I've been over this think 10 times checking electrical plugs and hoses (all were labeled during process). Hasn't thrown a code yet. I think that's pretty much it. I'm stumped here, anyone have any thoughts to share? I'd sure appreciate the help!
