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  1. Y

    Barn Door Alignment?

    They make plastic panel grommets for these? Mine never had any since I've owned the truck and I always worry about water incursion/rust as a result? I didn't know they existed....
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    Testing the wiring and gauge for 3 wire sensor

    It may not be that simple. If you have a +5 reference, a signal out and ground - that (to me) implies a digital output which isn't going to be a nice simple 0v=0PSI; +5v=100PSI type of thing. My guess is the sensor is sending out pulses at a variable frequency and the Holley ECU counts the...
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    1999 454 carb swap. best street carb, 600? 650? 750? CFM

    Nice clear explaination - makes sense too. Based on that, I'm assuming that a TBI (which is still technically electronically controlled so would still in my mind be an EFI system) would have the same drawback as a carb in that its a wet manifold setup? Whereas a newer style injection with an...
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    Spark plug foul up

    Question on this: Does the O2 sensor generate the voltage (using a thermocouple-type device) or does the ECU provide a specific voltage to the wire going to the O2 sensor (voltage changes based on resistance inside the sensor)? Doesn't change the way the voltage is monitored, just wondering...
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    Daughters ‘87 needs to ride smooth.

    The tires also wear along the center line faster when inflated to max PSI on an empty bed. The back tires that were on my former F250 were like that - the guy had kept them at the or near the sidewall rating which would have been fine when carrying a load, but way too much for the empty bed...
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    Rear camera installation

    I am not sure that wiring will be under the dash since nothing in the cab actually depends on it - my understanding is there is constant +12 going to the switch on the transmission (which closes when you move the selector to "R") and then from there it goes right to the reversing lamps. The...
  7. Y

    Help with diagnosis and repair

    Weirder and weirder..... I'd almost bet you have some kind of small leak that is allowing exhaust into the coolant. It would have to be happening at a location where the exhaust pressure is higher than the coolant pressure because otherwise you would be seeing steam in the exhaust. I'd...
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    Help with diagnosis and repair

    What does your dipstick look like when you pull it? Could be cross-contaminating coolant and oil, which could come from either lower intake or head gasket... If you pull the oil stick and have something that looks like brown mud, or notice any kind of whitish foamy looking stuff on the inside...
  9. Y

    Repeated stalling

    I will do that! I was not aware you could do that without turning off the key first. That may yield a previously hidden data point.
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    Very fast idle on start

    If giving a tap on the pedal slows it down, could be something simple like a linkage binding. I'd start by verifying everything moves freely and smoothly.
  11. Y

    Filling small holes without welding

    I had to do something similar with a small section of the floor area of an MGB up under the throttle pedal - a very difficult spot to access for cutting out and replacing (and above where the replacement floor pans went up to) - pinholed but not completely gone. I opted to work across the...
  12. Y

    Repeated stalling

    Here is a relevant question where I occasionally experience a similar but not always identical issue. When it stalls, can you immediately restart without turning the key back to the OFF position? In my case it will give no fuel or spark until the key is rolled back to fully OFF, then it will...
  13. Y

    TBI timing help…

    I'm still trying to get my mind around the injectors continuing to trigger once the engine stops. Since the injector pulse comes from the distributor pickup similar to the ignition coil trigger, if the distributor isn't turning they injectors in no way should be firing at all. If something is...
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    TBI timing help…

    Hold the phone! Injectors were running after the engine stalled? As in trickling fuel, or full spray? That could be a symptom of a different problem. My (probably incomplete - others feel free to fill in what I miss) comprehension of how the injectors work is the computer gets a pulse from...
  15. Y

    Windshield Wiper Intermittent Function

    So how much oil does the relay leak out on a weekly basis? Seriously, Lucas stuff gets a bad rap when in reality they made decent stuff, but the cars it was installed into had no rust prevention and the grounds would corrode, causing all sorts of stuff to go weird that was not a defect in the...
  16. Y

    TBI timing help…

    OK these become clues (or "data points" to the more tehnically engineeringly inclined). Code 42 is the not very helpful "electronic spark control" error - lots of things can trigger it. Disconnecting the bypass to set the timing will set it, so you need to clear the codes by disconnecting the...
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    TBI timing help…

    The ECM is usually the last thing to eat itself, not impossible but would save that for after sorting out a lot of other things 1st. Did the new distributor include a new module as well? If not that would be the top of my suspect list. When you set the motor at TDC, did you pull a plug and...
  18. Y

    Vintage Air Gen V (5) or replace existing compressor, etc., for 1987 R20 Suburban?

    My rear bracket is all out of sorts. The plastic that everything screws to has gotten so brittle that its just flaking apart. Right now theres just a lot of zip-ties and hopes holding most of it together, although the fan does run freely. Doesn't move much air though, I don't think the...
  19. Y

    Vintage Air Gen V (5) or replace existing compressor, etc., for 1987 R20 Suburban?

    The thermal switch is on the passenger side of the engine (single wire) - if the wire came off and is touching metal somewhere, it will trigger the fan to come on. If the wire isn't just hanging loose, try unplugging it from the switch and turn the key on; if the fan stopped than there is a...
  20. Y

    Vintage Air Gen V (5) or replace existing compressor, etc., for 1987 R20 Suburban?

    I have one of the later year (1989-1991) Suburbans that have the compressor on the passenger side of the engine and the alternator on the driver side. Will that prevent me from upgrading to a Sanden compressor? My system is factory but not doing well at all - the more I read the more I think I...
  21. Y

    Radiator fan direction

    Unfortunately I couldn't find any markings on it that would indicate which direction it should turn, so I had to go more or less on faith that it was the correct pump for the engine (and it did not appear to be a recent replacement) - it stays perfectly cool running down the highway at 67-70...
  22. Y

    Blinkers are acting up

    I'm with Fast99 on this one - that sounds like a grounding issue to me as well. The sockets and housing on trucks of this age have corrosion - how much depends on a lot of factors but none of them (unless already restored) are rust free - so thats where I would start. I frequently add...
  23. Y

    Fluid Changes

    That could explain some of the very odd intermittant oil smoke I have gotten when running at highway speeds...not sure how hard removing the covers on mine will be (1989 a lot of "stuff" in the way compared to the 60's-70's engines) but could be worth a look....
  24. Y

    Batteries sho

    When you charge the battery and connect it, do you see or hear any kind of spark as the cable is attached to the battery? If its runnng down in 3 days that would seem to be enough draw to actually cause a small spark. I'd also try leaving one of the battery cables disconnected, to rule out any...
  25. Y

    Radiator fan direction

    Yeah - I found that out the hard way when I went to flip it around thinking they had put it on backwards, and it was STILL wrong. Had to go buy the right fan, they apparently put one from an older engine that used V belts (pump turning same direction as engine) instead of a serpentine setup...

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