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    Battery Isolator Issues 1990 Suburban

    Recently installed a new Isolator and a second battery and now have an issue with no headlights, parking lights or interior lights with the key off. The second battery is located in the back of the suburban and runs a 12 volt air compressor and a boat trailer winch. After this install, the...
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    1990 TBI 350 Warmup Idle Speed ?

    1990 350 TBI in V2500 Suburban. Recently it stopped the high idle on startup. This took place from one evening to the following morning. Makes me believe that this is a component failure ? It will start with just a touch of foot on the pedal and hold adequate idle until it warms up. Once warm it...
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    90 Suburban TH 400 Kickdown ?

    I have a 1990 V2500 Suburban with the TH 400 transmission. The kick down has stopped working. Not being familiar with the TBI setup, I am wondering where to start. I do know that there is a component internal to the transmission the has an electrical plug that is intact. There must be a switch...
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    241c transfer case vent

    I have a 1990 V2500 suburban, manual transmission, 241c transfer case. The transfer case has an approximately 3/8" diameter vent hose off the top right hand side that runs forward and was terminated near the right exhaust manifold It looks as thought this hose may have continued on at one point...
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    90 5.7 TBI idle surging

    1990 Suburban manual transmission 5.7 TBI. Runs good but after warmup at idle it surges probably 300-500 rpm. only annoying at this point but am concerned as to where this is going. It is not consistent in that sometimes it is worse than at others. No Codes. I am thinking possibly the Idle Air...
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    Turbo 400 filter(s)

    Just to share my TH 400 filter and fluid change experience. TH 400 , 90 Suburban right at 200,000. Drug it out of a barnyard in early JAN. Have been going thru all the usual stuff and when I got to the transmission fluid /filter change I learned a few things. Bought a NAPA filter and gasket...
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    TBI Injectors

    90 350 TBI Suburban brought back to life after a long recess. I have been changing the usual suspect components and have it in decent running condition. It does have a rough idle particularly when cold. With the breather off I have observed what appears to be an erratic spray pattern on the...
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    Harmonic Balancer ?

    I am going to be replacing the radiator and water pump on my 90 suburban 350 TBI. While looking things over I noticed the rubber ring on the Harmonic Balancer looks deteriorated in a couple of spots. Does this indicate it is time to replace ? If so, it appears this would be the time to do it ...
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    90 suburban dead

    My 90 suburban was running fine after an electrical tune up and fuel filter change. Drove to town, came back out and turns over but will not start. Fuel pump is running for the normal 20 seconds when the key is on and then shuts off. This would indicate proper fuel pressure ? Changed relay, no...
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    SM465, NP 241C fluid leakage

    I have a 1990 V2500 suburban with the SM 465 manual transmission and New Process 241c transfer case. Did a fluid change in both and the ATF in the transfer case was low and the transmission was over filled and has the appearance of some ATF mixed with it. I assume I have seal(s) leaking in each...
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    90 Suburban ECM Fuse Popping

    I have a 1990 Suburban that has random 10 amp ECM fuse failure. This has happened 4 or 5 times over the last few months. This shuts down the engine. It still cranks but will not start until the 10 amp fuse is replaced. It has always happened when moving and all but once when I have hit a...
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    241c input shaft conversion ?

    I am looking for a spare 241c transfer case for my 1990 suburban with the TH400 transmission. The existing 241c is a 32 spline input shaft. I have access to a 27 spline unit that I know to be in good shape and would like to know if conversion to a 32 spline is possible ? if so is it practical in...
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    GM 10 bolt front Spline Count ID

    Aside from pulling and axle, is there anything externally that identifies a GM 10 bolt front as 28 or 30 spline inner axle shaft ? Thanks in advance for your replies.
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    10 bolt Front Problem 1990 Sub V2500

    I have a 1990 V2500 Suburban. It has the 10 bolt GM front axle and I am led to believe that it would have the 30 spline inner shaft ? Is this correct ? It is 4:10 gear Ratio. I have a random intermittent popping sound/clunk when running in 4wd. I believe I have narrowed it down to the right (...
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    Adding a Battery 1990 Suburban

    I need to add a Battery to my 1990 Suburban. I need to know the best place to get a tray and any recommendations on isolator installation, wiring dos and dont's etc.
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    1990 Suburban Square Body Fuel Pump Replacement

    I have a 1990 suburban (square body ) that I need to remove and replace the in tank fuel pump. I am considering an access panel in the floor of the bed. it looks as though this is possible but a bit tight due to the support member spacing. The pump is centered between supports but the two line...
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    1990 Suburban Square Body Fuel Pump Replacement

    I have a 1990 suburban (square body ) that I need to remove and replace the in tank fuel pump. I am considering an access panel in the floor of the bed. it looks as though this is possible but a bit tight due to the support member spacing. The pump is centered between supports but the two line...
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    90 Suburban Fuel Pump ?

    My good running 1990 suburban quit without warning recently. While sitting, the idle came up and then engine died. Trying to restart it coughed a couple of times. Cannot hear the fuel pump in the tank so I am guessing there is no fuel to the throttle body. When I turn the key on there seems to...
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    1990 Suburban 350 TBI Fuel Pump

    The fuel pump (in tank ) has failed at about 170,000 miles and am going to replace. Many options out there. Any brands that are truly ahead of the rest in function and reliability out of the box? Any in particular to stay away from ? Thanks for the input.

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