Recent content by rydog

  1. R

    5.7 back fires through carb but timing is good.

    To me it seemed like air was going out the intake/carb. The pull the intake and use marvel mystery oil to look for bubbles seems like a good idea. Getting bored of testing though and kinda just want to start replacing and see what happens
  2. R

    5.7 back fires through carb but timing is good.

    The old thing has solid push rods not hydraulic lifters Ohh seems like I'm wrong but not running anyway. Getting tempting to just spend 2500 bucks on a crate motor I've never been into internals too much
  3. R

    5.7 back fires through carb but timing is good.

    Seems logical to me. I might go pick me up some marvel mystery oil after work and try it. Seems like a good way to avoid buying one of those smoke machines.
  4. R

    5.7 back fires through carb but timing is good.

    When I was doing the leak down test I had the valve covers off and when I seen I was tdc I felt that the pushrods had no pressure on them and that there wasn't a bunch of play between the push rod and rocker arm. They all seemed fine isn't that a decent check?
  5. R

    5.7 back fires through carb but timing is good.

    I don't but I can have it off pretty quick If I need
  6. R

    5.7 back fires through carb but timing is good.

    Ohh something else I should of mentioned is during the leak down test on two cylinders when I first tried it made a pop noise and it dropped real fast but then could reapply the test and get a reading. Was that maybe the valve stuck and psi being applied made it unstick?
  7. R

    5.7 back fires through carb but timing is good.

    At this point I've got it down to the timing chain. I'm tempted to pull the heads and trade oriellys for a fresh set. I guess I should measure the cam and make sure it's not the issue before. Looking back while it was running I wish I took the vacuum gauge to it and maybe gave it a couple of...
  8. R

    5.7 back fires through carb but timing is good.

    I'm not a 100 percent sure it wasn't over revved it was a company truck for an aluminum plant then it was a farm truck for tenish years and then did a lot of sitting.
  9. R

    5.7 back fires through carb but timing is good.

    Ever since swapping the Edelbrock on it I haven't had it running to put a vacuum gauge on it. It acts just like it did with the quadrajet on it. It shot fire balls out of that carb too. I figured that was probably vacuum leaks but I guess I was wrong. I would assume if I dumped enough gas in...
  10. R

    5.7 back fires through carb but timing is good.

    Well I did a leak down test. I only have a cheap harbor freight tester which I don't think applies as much PSI as I probably should for a test. 1 and 8 were dang near 40 percent. 3 was 35 percent. The rest were between 25 and 30. Which isn't good huh? So seems like the valves are having...
  11. R

    5.7 back fires through carb but timing is good.

    That's a good idea ill try that I had if off before when I was turning it but it's hard to turn from the top with out removing the fan I've learned to use my inspection camera to see the timing marks of whatever from underneath hahaha. The Odometer says 98,234 I would guess 198,234. It was last...
  12. R

    5.7 back fires through carb but timing is good.

    Ohhh I did kind of eye ball the push rods and valves springs and none of them looked unusual as it cranked. Yeah I think my next step should be tear off the front and get to the timing chain and check it out. The chain didn't seem to make any noise while it did run
  13. R

    5.7 back fires through carb but timing is good.

    Ohh and for the heck of it since it seemed like every post about back firing out the carb said timing was 180 degrees off. I flipped it 180 degrees and I would say the back firing was worse...
  14. R

    5.7 back fires through carb but timing is good.

    I bought a 1984 K20 auto it has never started well I would have to pour gas down the quadrajet and if would back fire out the carb for awhile but eventually start and seemed to run pretty good I drove it 15 miles to get a vin inspection for it. It seemed to run rich. Then anytime after it sat...
See more

Latest posts

Forum statistics

Threads
45,558
Posts
986,222
Members
38,643
Latest member
Hard
Top