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Type: Posts; User: alchemist1

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  1. Replies
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    572

    Yup, I know all about the CEL codes and what they...

    Yup, I know all about the CEL codes and what they mean, but just wondering, can the fuel injection (CSFI, and all its shortcomings) cause the misfire? I am thinking yes.
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    572

    4 CEL codes, sometimes flashing...

    My 98 Suburban (251,000 miles) has been running bad the last couple of weeks and is throwing a CEL, and scanning it shows four codes:
    P0420 (Bank 1 catalyst effciency), P0430 (bank 2 catalyst...
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    1,166

    CSFI to MFI conversion

    Hi,
    New to this forum, wondering if there might be a reasonably detailed writeup for conversion of late 90's Vortec (5.7L) CSFI to MFI. Amazon.com has the AC-Delco for $250 which is a heck of a...
  4. Fuse #13 keeps blowing (rear door speakers, cig. lighter, lumbar seat)

    On my 98 Suburban LS, I keep blowing fuse #13, a 20 amp one. This is the one that supplies power to the lumbar seat, the rear door speakers (right and left rear doors - not the back speakers in near...
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    717

    Yup, just found the part number: 15686634. ...

    Yup, just found the part number: 15686634.

    Thanks-
  6. Power door lock/lumbar/rear door speaker electrical gremlin

    One more weird electrical question. I keep blowing fuse #13, a 20 amp one. This is the one that supplies power to the lumbar seat, the rear door speakers (right and left rear doors - not the back...
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    717

    Power window diagnosis help

    Just last week, my 98 Suburban power windows developed an interesting problem. They will roll up and down fine from the master swich, at the driver's door, but each individual switch at the...
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    1,669

    Got it, and I see exactly what you are talking...

    Got it, and I see exactly what you are talking about. although i think what that bracket may be bolted to may be the lower intake. You've literally gotta have your knee on the radiator support and...
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    removing ignition coil/ICM bracket

    OK, so basic question on replacing the ignition coil on my 98 Suburban. The ignition coil/ignition control module bracket nuts are hidden by a wiring harness bracket. I can see two of the nuts that...
  10. Help with No Start Issue (Suspect Fuel Pump, Again)

    On my daughter's 1998 Suburban, it went from a hard start in the mornings to no start. Here's what I've done:

    1. Fuel pressure at the rail is about 51 psi. I'm using the red fuel pump lead...
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    Will not start - suspect fuel pump??

    So a couple of diagnostics just done:

    1. Fuel pressure at the rail is about 51 psi. I'm using the red fuel pump lead under the hood to test. Occasionally, it will jump up to maybe 54-55 psi.
    ...
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    Yes, 1994 would be the OBD1. But your programmer...

    Yes, 1994 would be the OBD1. But your programmer either needs access to a 'spare' PCM or your car, whichever easier. 'Round here in eastern North Carolina, I can walk in to a salvage yard and pick...
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    The stock computer can be made to run the 383, no...

    The stock computer can be made to run the 383, no problem. Post 1995 vehicles were OBD2. On the "need to have a new chip burned", there's no such thing as a new chip. Chips are not external to the...
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    Hard Starting...Revisited!

    Back in the Fall of 2009, I replaced my fuel pump on my daughter's 98 Suburban with a new AC Delco MU1748. It had symptoms of deliverying pressures around 47-48 psi and basically got so it wouldn't...
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    2,478

    It's easy. Just use the red-connector wire on...

    It's easy. Just use the red-connector wire on the left side of the engine (driver side) and connect it to the battery. That gives the fuel pump juice.
  16. Low oil pressure...then big time oil leak 15 miles later!

    My daughter's 98 Suburban (245,000 miles) all of a sudden, when started up the other day, showed very low oil pressure. It set off the Check Gauges light. Plenty of oil in crankcase, and...
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    OEM fuel lines?

    On my 1998 Suburban,
    The design of the sending unit fuel connections don't allow the classic scissor style fuel disconnect tool to be used (I have a good quality Lisle one). I had to go get some of...
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    Call me stupid (idotic). I was probing across...

    Call me stupid (idotic). I was probing across the wrong terminal. Did the correct 4 pin terminal and probed across B and C terminals (grey pump power and black ground) and saw 12+V. So pump is...
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    Low Voltage at fuel pump harness

    I just pulled my fuel tank on the 98 Chevy Suburban and before replacing the pump/sender, thought I would test voltage at the harness connection on top of tank. I am getting about 5.5 Volts (and...
  20. Fuel Pump Power Wire/Connection - Location?

    Working on my 98 Suburban, I'm trying to avoid dropping my fuel tank to do this, but I want to get the voltage on the grey power wire going to the fuel pump. Many cars have a nice connector near the...
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    Are you sure about this, that the pump would work...

    Are you sure about this, that the pump would work with less than 12V? the bad thing about the 'grey'wire is that there's no connector convenient to probe. GM b-bodies have a long harness disconnect...
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    Fuel pump diagnosis...

    Just curious before I pull my fuel pump (which is consistently showing low pressure - 40-45 psi at test port at engine). Would the pump work at all if the voltage was low to the pump? I'm thinking...
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    Thanks and that's where I might go next. I...

    Thanks and that's where I might go next. I really can't believe I would get any more pressure at the fuel filter inlet, but anything to not have to pull tank. I agree about wiring harness. Have...
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    [QUOTE=MrShorty;175394]For a sure test, you...

    [QUOTE=MrShorty;175394]For a sure test, you probably do need to clamp it off completely. With what you did, the pressure didn't spike, could you tell if there was any gas flowing through that line at...
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    Thanks again MrShorty for the good advice. I did...

    Thanks again MrShorty for the good advice. I did see what you were talking about underneath truck, about 8 inches forward of where the filter is. I ran the pump today and pinched the line hard with...
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