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  1. 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...
  2. 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...
  3. 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...
  4. 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...
  5. 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.
  6. 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.
  7. mibars

    Random Service Engine Soon light

    Aha! I could have checked it too quickly. I'll recheck.
  8. 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...
  9. 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 :) )
  10. 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...
  11. 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...
  12. 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...
  13. 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
  14. 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...
  15. 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...
  16. 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.
  17. 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
  18. 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
  19. 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...
  20. mibars

    Oil pressure sensor 305 / 350

    Is there a way to remove that 3 prong sensor of a 350 TBI without removing distributor? EDIT: Just found out that dedicated sockets exist for these sensors, my sensor seems to measure about 30 mm, looks like possibly 1 3/16 in (that's about 29 mm), but my new sensor is smaller, measuring about...
  21. mibars

    Water pump questions

    Bumping the thread. I have a factory shroud. What's the procedure on water pump removal, or more precisely on fan removal? Looks like to get the fan out I need to remove shroud, but to remove shroud there should be no fan in the way :D What's the correct way of doing it without poking a hole in...
  22. mibars

    Beware- LMC Blazer seat upholstery/foam mismatch

    I guess you could get a refund from LMC as it appears as their error in listing, but the stripped frames are your loss :( I guess an upholsterer could replace the integrated foam with new custom foam, but that would not be very cost effective.
  23. mibars

    Door skins delaminating

    Look what I've found yesterday, this seam appears when I lift the door. My passenger door is sagging a tiny bit, I was replacing a hinge pin and a worn door striker when I've noticed it. This explains why this door had so much flex in outer door skin when I was using door handle. Also the whole...
  24. mibars

    Show your daily driver

    That rusty, filty thing which I love for being so versatile, but also hate for how annoying it is to work under the hood of that thing. 2004 WRX Wagon, slightly modded, with mix of performance and off road mods, lifted, with skid plate, shorter and tighter diffs, but with stiff sway bars, better...
  25. mibars

    How to flash high beams?

    Thank you Matt, I read that linked article and it looks like it basically meant to be a feature like this, but they simply didn't install it! I recall that the 3-wire connector on a steering column looked like it could take one more wire. Is the dimmer switch independent from wipers and cruise...

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