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  1. mibars

    Random Service Engine Soon light

    Confirmed, it was a knock sensor. Both old and new ones read 100 kOhm, but when tested with multimeter on AC volt range the old one generated just millivolts when mounted in a vice and knocking vice with a hammer, the new one spikes above 1 V in same conditions. Old one has some damage on the...
  2. mibars

    How to flash high beams?

    Got the 1994 Fleetwood dimmer switch installed, it wasn't as plug-and-play as it is in that guide for a Cutlass, but I got it working. The switch itself looks almost identical, connector has additional pin for 12V power, the difference is in the mounting bracket: It has same bolt pattern, but...
  3. mibars

    New UK based member

    Welcome from Poland
  4. mibars

    Let's see those 4x4 Squares On Dirt!

    My favourite shortcut by the rail tracks was recently obliterated by construction equipment and rainy weather, but that was nothing for the Burb! Kinda reminds me of photos of that russian highway from pre-meme era of internet!
  5. mibars

    Random Service Engine Soon light

    Oh I thought that's the recommended method for a high pressure hot flushing the system :D I think if I create a a bit of vacuum in the system, by simply parking it hot and pinching the expansion tank hose so it cannot such the coolant back into system then nothing would even come out through...
  6. mibars

    700R4 Information Thread

    We can assume that transmission is original to the vehicle, the video: It doesn't short shift to 3 or 4th gear. It'slike this: 1-2 at 1600 rpm, with like two steps resulting in a drop to 1000 rpm. It sounds like lugging a bit. 2-3 at 2000 rpm meaning that it stays quite long in 2nd 3-4 also...
  7. mibars

    700R4 Information Thread

    A friend has a 700R4 in 1992 GMT400 and is experiencing a strange behaviour. At light throttle it quicklys shifts at about 1600-1700 rpm to 2nd and there is a large, like a two step drop of RPM down to about 1000 rpm then it shifts to 3rd about 2000 rpm and also to 4th at about 2000 too (almost...
  8. mibars

    Random Service Engine Soon light

    Yes, like this or very similar. Easily comes off when you pinch it and can spin around when plugged. Not sure about having mechanical advance in TBI, I thought that timing is managed electronically. I believe it's correct, not touched it recently, can' feel any misfire. I checked plugs some...
  9. mibars

    Random Service Engine Soon light

    Exactly. The conenctor is bit unusual, it clicks on and is free spinning. Doesn't seem to be a too reliable connection. Just checked if it didn't come off and looks fine. Description of a self test procedure perfectly matches situation when the CEL was shown. Creeping in traffic coolant had an...
  10. mibars

    Random Service Engine Soon light

    It is! It's the block drain hole on a starter side of the motor, opposite to the drain on driver side. Based on internet knowledge it is common that no water comes out from these two drain holes due to the crud buildup. It was same for me, it needed a dab from screwdriver to start flowing. It...
  11. mibars

    Random Service Engine Soon light

    I've removed and reattached knock sensor just a week ago when I was draining coolant, I'll check it if the wire is still attached correctly. When I was installing it I did check if there is ground continuity between sensor body and engine block, as I've sealed it with Teflon tape.
  12. mibars

    Random Service Engine Soon light

    Okay, it's 43. "43. Low voltage at electronic spark timing circuit" I wonder, was it loose wire, poor connection or what? I'll monitor if this error will repeat. For reference: Each error, including "error 12" flashes 3x, so it is 12, 12, 12, 43, 43, 43 and back to 3x 12.
  13. mibars

    Random Service Engine Soon light

    Aha! I could have checked it too quickly. I'll recheck.
  14. mibars

    Aquí desde Argentina

    Welcome! Your truck is looking good! I understand your struggles with parts, being in EU where classic US trucks are a super rare sight we have to import stuff from US. Fortunately parts in US are not that expensive and availability is amazing, but with shipping, duties and taxes it roughly...
  15. mibars

    What have you done to your square lately??

    New tensioner and idle pulleys. I love how it takes just couple of minutes to get both of them replaced, not even removing fan shroud. Also that they are standardized sizes, not requiring any oversear purchases (that's importing from US for me :) )
  16. mibars

    Random Service Engine Soon light

    Hi, I've got a CEL or "Service Engine Soon" light today. I've been rolling slowly in traffic when I've blipped the throttle to hear the engine. It downshifted as intended, increased the driver fun factor, but also threw the CEL, no other ill effects. CEL went away after shutting down, checking...
  17. mibars

    What have you done to your square lately??

    I didn't like how dark the interior of Suburban is at night. Actually one of my first mods was to install a rear view mirror with additional lights, but it was not enough. I was planning to install another dome light around middle row to make the interior a bit brighter. But before that I...
  18. mibars

    What have you done to your square lately??

    Mine did that too, it reached a rate of 1 drop every 2 or 3 seconds when cold and parked, but with intentionally depressurized radiator cap so it would not squirt coolant when hot and building pressure. With radiator cap sealed it would lose a liter or two after parking and stop. I believe that...
  19. mibars

    What have you done to your square lately??

    Replaced a water pump and radiator hoses. Didn't care to clean the timing cover more than couple of wipes of brake cleaner soaked rag :D
  20. mibars

    Oil pressure sensor 305 / 350

    An update: It sits at 15 PSI high or low rpm, cold or hot. Only when hot and idling it drops a little bit to like 12 or so. If I understand operation of oil pump correctly it shouldn't behave like that, higher RPM even on worn out engine should have some effect on pressure. It's like either the...
  21. mibars

    Barn doors and door questions

    I glued a piece of black insulating foam to cover that hole, looks similar to that foam backing. Also got a replacement door striker from LMC. My weather stripping is definitely not original to the truck. Actually I wonder now why my burb has no door moldings and not even holes for screws, was...
  22. mibars

    Oil pressure sensor 305 / 350

    Interesting... So what did I replace? At around 3:10 mark you can see what have I replaced, it looks slightly different... I don't have an old style metal can sending unit attached to the oil filter base.
  23. mibars

    Oil pressure sensor 305 / 350

    Yes, I checked gauges couple of months ago. With my old sensor irmt was at 30 psi all the time. Also with sensor unplugged or new one plugged but not grounded it pegged over 60
  24. mibars

    Oil pressure sensor 305 / 350

    Looks like 15 psi exact. If I understand correct how the oil pressure switch works vs oil sending unit a switchused with gauges should peg the gauge at over 60 psi when there is an oil pressure. I got this one: https://www.rockauto.com/en/moreinfo.php?pk=44314&cc=1301465&pt=4588
  25. mibars

    Oil pressure sensor 305 / 350

    I found online sockets that are stepped to both 1" and 1"1/16, but not to both 1"1/16 and 1"3/16. Anyway doesn't matter as I finally managed to get the old one loose with small vice grips under distributor. Now my gauge shows zero at engine off and... 15 psi either long cranking or cold idle...

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