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  1. M

    350 TBI Boggs and surges under load

    Definitely not oil, just fouled from a rich mixture. Could that be because of the misfiring cylinder causing the computer to add more fuel? Or would that be the opposite? I replaced the ICM. I don't think it's the distributor because when I unplugged the electronic timing advance and set base...
  2. M

    350 TBI Boggs and surges under load

    Did a compression test today (Injectors unplugged, coil unplugged, battery charged with the charger still on, all plugs out, 5 cranks per cylinder) here are the results: Cylinder- PSI 1- 165 2- 170 3- 175 4- 160 5- 170 6- 165 7- 170 8- 175 While had the plugs out I scanned my peepers on them. I...
  3. M

    350 TBI Boggs and surges under load

    I'm at my wits end with this truck. I've looked over and over the sensor data and everything seems fine. I rechecked all the stuff that I've checked already and again it all looks fine. I have no idea where to go anymore. Is it possible that this is an ECM issue? Somebody had hacked the wiring...
  4. M

    350 TBI Boggs and surges under load

    The issue is that the RPM's surge when I hold the throttle as I posted a video of a couple posts ago. Also the truck has no power and struggles to get up to normal driving speed. Yes the Log contains the issue The log is just of me sitting in park holding the throttle and then letting off a...
  5. M

    350 TBI Boggs and surges under load

    Anything you recommend?
  6. M

    350 TBI Boggs and surges under load

    couple updates: I tested the EGR valve with a vacuum pump and it was bad so I replaced that. Now the vacuum seems higher at idle I also replaced the temp sensor but the gauge still doesn't work for some reason. If I ground the sensor wire the gauge goes all the way up so its not a wiring...
  7. M

    350 TBI Boggs and surges under load

    I know nothing about the history of the truck and have no contact with the guy I bought it from. I just know it started life with another 350 TBI and after experiencing the same issues the last guys decided to swap the engine for some reason. (talk about fix by wallet) It now has a 350 out of a...
  8. M

    350 TBI Boggs and surges under load

    So something weird happened. I disconnected the timing advance and set the timing where it was happy, probably about 15 degrees advanced. ran nice and smooth, no surging. Figured this meant there was an issue with the timing advance. Set it back to 0 degrees and plugged the advance back in. Now...
  9. M

    350 TBI Boggs and surges under load

    Tested the ECM one and it checks out. The gauge one is busted. Yeah I think I'm gonna buy a ALDL cable and use my laptop. But its such a pain to get anything in Canada I have tried it both ways with the same result Anybody know what this white box is? it has one open connecter.
  10. M

    350 TBI Boggs and surges under load

    Tested the fuel pressure, 12 PSI solid no matter what (as it should be with a brand new pump) Checked the distributor and the magnet does look a little worse for wear. However the ohms on the pickup coil are okay ~1300 I double checked a few other sensors and everything seems fine. I also...
  11. M

    350 TBI Boggs and surges under load

    Quality Yes Freshly cleaned and oiled K&N, although for most testing I have the filter off Vacuum leaks: Only about 2 or 3, just rotted lines. PCV, canister purge valve, might have been one more I don't remember. I believe I have curbed them all I've heard of the overheating ICM issue...
  12. M

    350 TBI Boggs and surges under load

    Knew I forgot something. No Codes, even if I try to force the issue. Don't have a scanner. I don't know where to get one, You need a laptop right?
  13. M

    350 TBI Boggs and surges under load

    I have a 1994 Chevy k1500 with a 350 TBI that is kicking my butt. Starts fine, idles fine other then a little shutter now and then, snaps the throttle fine, but if I hold the throttle in any position it starts surging and bogging. Definitely worse when warm. What I have done so far: Replaced...
  14. M

    1994 Chevy 1500 5.7 TBI Running Issues

    Yes the 4wd Aluminum casting one. I found the stampings. Nothing interesting, just a truck 4L60E.
  15. M

    1994 Chevy 1500 5.7 TBI Running Issues

    Update: It drives! Sorta... Had to get a replacement dipstick tube because the one in the truck was completely wrong. After that and the new seal were installed I filled it up with fluid and took it for a drive, thankfully the transmission seems to shift fine after being run low on fluid for so...
  16. M

    1994 Chevy 1500 5.7 TBI Running Issues

    Finally got everything put back together and it seems to be running better. Still have a couple things to do before the road test but so far so good. I was poking around under the truck trying to find the source of my trans leak and noticed a few things. First and most important is that the O2...
  17. M

    1994 Chevy 1500 5.7 TBI Running Issues

    Haven't updated in awhile but man alive this truck has been fighting me every step of the way. Dropped the fuel tank and man was it a mess. Nasty grease all over everything, the fuel pump wasn't even locked in properly and everything was rusted despite all the grease. Snapped the strap bolt that...
  18. M

    1994 Chevy 1500 5.7 TBI Running Issues

    Update Finally got a chance to do some work on the truck. New plugs, wires, cap, rotor and coil are installed. seems like maybe it runs a little smoother but not too much of a difference, oh well at least i can cross it off the list. I got a fuel pressure tester and adapter and my fuel pressure...
  19. M

    1994 Chevy 1500 5.7 TBI Running Issues

    I can't seem to find it, do you have a link? Stuff is annoying to find in Canada.
  20. M

    1994 Chevy 1500 5.7 TBI Running Issues

    Yeah I was suspecting an o2 sensor as a possible issue. I pulled out the IAC and hit it with some carb cleaner but didn't change too much. I guess it's cheap enough to just replace but I think my issue goes further then that. OBD1 systems are very new to me I'm used to Carbs or OBD2 so this is...
  21. M

    1994 Chevy 1500 5.7 TBI Running Issues

    Yeah I'm assuming the guy didn’t have his story straight about the engine and transmission. I'm having a hard time finding any kind of fuel pressure adapter available. Also for the data log I need an ALDL cable and a laptop right? Neither of which I have. I did use a jumper cable to read codes...
  22. M

    1994 Chevy 1500 5.7 TBI Running Issues

    For some context I bought this truck about a week ago so I don't know much about the history of the vehicle. I got a very good deal on the truck due to the running issues so I'm not afraid to spend a little money if need be. The guy I bought it off of did not seem to have much mechanical...

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