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1989 Suburban V1500 TBI 350 problems...

This is a discussion on 1989 Suburban V1500 TBI 350 problems... within the C10 Forum forums, part of the General Discussion category; I sent a set of 350 injectors to witchhunter.com. they cost $19 each plus $10 return shipping and are very ...

  1. #21
    Registered User jim_in_dorris's Avatar
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    Re: 1989 Suburban V1500 TBI 350 problems...


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    I sent a set of 350 injectors to witchhunter.com. they cost $19 each plus $10 return shipping and are very prompt. I haven't got them installed yet, but from the flow testing, they look really good.

  2. #22
    Registered User Swearingsailor6's Avatar
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    Re: 1989 Suburban V1500 TBI 350 problems...

    I may just do that....if they are bad, then they will tell me and not charge me, besides return shipping, that is. I took a look at their website and it seems like they know what they are doing.

    How fast from shipping them to receiving them was it? I'm an instant-gratification type of guy, I like things now, and hate waiting for shipping. Not to mention my truck will be down for that long...It has been running pretty good lately besides a small bog when I get on it, and a small backfire every once in a long while...still is lacking power and smelling rich though. It also still idles rough...

    Ill get my head strait on what I am going to do with this and post the outcome! :)
    thanks for the help!
    Ryan
    1999 Chevy Suburban K1500
    1990 Chevy Cheyenne K2500
    1989 GMC Suburban V1500
    1988 Chevy Silverado K1500 RCSB
    1986 GMC K3500 CCLB 4x4 Dump Flatbed (project)
    1979 Chevy C20 Scottsdales
    1979 Chevy Silverado K10 454 4x4

  3. #23
    Registered User Swearingsailor6's Avatar
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    Re: 1989 Suburban V1500 TBI 350 problems...

    anybody bought used injectors off Ebay?? I see they are selling for like 50 bucks pair. Should I be ware of used injectors?? Should I just purchase new ones or get mine cleaned?? Thanks!
    1999 Chevy Suburban K1500
    1990 Chevy Cheyenne K2500
    1989 GMC Suburban V1500
    1988 Chevy Silverado K1500 RCSB
    1986 GMC K3500 CCLB 4x4 Dump Flatbed (project)
    1979 Chevy C20 Scottsdales
    1979 Chevy Silverado K10 454 4x4

  4. #24
    Registered User robotic_junky's Avatar
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    Re: 1989 Suburban V1500 TBI 350 problems...

    You are better off getting your injectors cleaned or buying new ones.
    2005 Chevy Corvette LS2 DD 105k
    1991 Firebird n/a 190k
    1987 Silverado 350 HSR 230k
    1980 Bonneville 350 Olds. diesel 198k
    1993 G20 350TBI 252k

  5. #25
    Registered User Swearingsailor6's Avatar
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    Re: 1989 Suburban V1500 TBI 350 problems...

    Put new injectors and Fuel Pressure regulator in today. Truck still idles really low, but off idle and through the RPM are much better. i don't have to goose it going up hills anymore. Didn't realize it was such a dog before, must have just slowly gotten worse. It doesn't seem to misfire anymore at idle. I still have the EGR plugged, maybe I will bump up the timing and reconnect the EGR tomorrow to see if anything changes.

    So if anyone wants a list of all the things I have done to it, here it is.

    New:
    Plugs
    Plug wires
    Cap
    Rotor
    Ignition Module
    Coil
    IAC Valve
    MAP Sensor
    Fuel Pump
    Fuel filter
    Both Injectors
    Fuel Pressure Regulator
    New Exhaust - Manifolds back
    O2 sensor
    Coolant Temp Sensor

    Probably more, but I am tired and don't feel like thinking anymore!!

    So basically, I have replaced part upon part, making the truck run better and better, but still not 100%.
    Anyone have any idea why it has such a low idle??
    Thanks!
    Ryan
    1999 Chevy Suburban K1500
    1990 Chevy Cheyenne K2500
    1989 GMC Suburban V1500
    1988 Chevy Silverado K1500 RCSB
    1986 GMC K3500 CCLB 4x4 Dump Flatbed (project)
    1979 Chevy C20 Scottsdales
    1979 Chevy Silverado K10 454 4x4

  6. #26
    Registered User robotic_junky's Avatar
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    Re: 1989 Suburban V1500 TBI 350 problems...

    Only sensor you haven't mention is the TPS. Check the voltage at your throttle position sensor. It should be between .45 to .47 volt at idle. The TPS should be at 4.5 to 5 volts at WOT.
    2005 Chevy Corvette LS2 DD 105k
    1991 Firebird n/a 190k
    1987 Silverado 350 HSR 230k
    1980 Bonneville 350 Olds. diesel 198k
    1993 G20 350TBI 252k

  7. #27
    Registered User Swearingsailor6's Avatar
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    Re: 1989 Suburban V1500 TBI 350 problems...

    I haven't checked that yet....I did do a leakdown, fuel pressure and vacuum test today, and everything is within specs.....ill have wait until monday to test the TPS...left my multimeter at work...now it seems the idle isn't misfiring, but it is kinda hunting around....it will idle fine when cold, but at operating temp, the idle goes up and down a little, not much, but it does do it. Would the TPS cause these symptoms? Thanks!
    Ryan
    1999 Chevy Suburban K1500
    1990 Chevy Cheyenne K2500
    1989 GMC Suburban V1500
    1988 Chevy Silverado K1500 RCSB
    1986 GMC K3500 CCLB 4x4 Dump Flatbed (project)
    1979 Chevy C20 Scottsdales
    1979 Chevy Silverado K10 454 4x4

  8. #28
    Registered User robotic_junky's Avatar
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    Re: 1989 Suburban V1500 TBI 350 problems...

    Symptoms of a Defective Throttle Position Sensor
    Following is a list of symptoms, either of or a combination of which, a car driver may experience because of a defective throttle position sensor:

    * Bucking and jerking of the car
    * Idle surging
    * Sudden stalling of the car engine
    * Hesitation while the driver of the car is trying to accelerate
    * Sudden surge in car's speed while driving on the highway
    2005 Chevy Corvette LS2 DD 105k
    1991 Firebird n/a 190k
    1987 Silverado 350 HSR 230k
    1980 Bonneville 350 Olds. diesel 198k
    1993 G20 350TBI 252k

  9. #29
    Registered User Swearingsailor6's Avatar
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    Re: 1989 Suburban V1500 TBI 350 problems...

    robotic junky, when you said volts, did you mean ohms, as in a resistance check?? I have 4.4V to the plug, but I did a resistance check on the TPS (basically a rhiostat, am I correct?) and got 1.66 at rest, and 5.4 at WOT for resistance. As for testing Volts at the TPS while connected, I don't see a way to check unless I poke the leads down in the wire on the back of the plug....
    1999 Chevy Suburban K1500
    1990 Chevy Cheyenne K2500
    1989 GMC Suburban V1500
    1988 Chevy Silverado K1500 RCSB
    1986 GMC K3500 CCLB 4x4 Dump Flatbed (project)
    1979 Chevy C20 Scottsdales
    1979 Chevy Silverado K10 454 4x4

  10. #30
    Registered User robotic_junky's Avatar
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    Re: 1989 Suburban V1500 TBI 350 problems...

    Test the TPS for signal voltage to the computer. Insert a pin through the ground wire and another pin through the signal voltage wire and connect the voltmeter probes to the pins using alligator clips. Start the engine. As you manually open and close the throttle plate, watch the voltage readings at the meter. The voltage should gradually increase from .5 to 4.5 volts and back to .5 volt. If you see erratic movement or no movement of voltage signal, replace the TPS. Turn off the engine.
    2005 Chevy Corvette LS2 DD 105k
    1991 Firebird n/a 190k
    1987 Silverado 350 HSR 230k
    1980 Bonneville 350 Olds. diesel 198k
    1993 G20 350TBI 252k

  11. #31
    Registered User Swearingsailor6's Avatar
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    Re: 1989 Suburban V1500 TBI 350 problems...

    ok, ill try it and see what happens.
    1999 Chevy Suburban K1500
    1990 Chevy Cheyenne K2500
    1989 GMC Suburban V1500
    1988 Chevy Silverado K1500 RCSB
    1986 GMC K3500 CCLB 4x4 Dump Flatbed (project)
    1979 Chevy C20 Scottsdales
    1979 Chevy Silverado K10 454 4x4

  12. #32
    Registered User Swearingsailor6's Avatar
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    Re: 1989 Suburban V1500 TBI 350 problems...

    .61 at idle 4.33 at WOT
    seems to move nice and steady.....

    Any way to adjust it??
    1999 Chevy Suburban K1500
    1990 Chevy Cheyenne K2500
    1989 GMC Suburban V1500
    1988 Chevy Silverado K1500 RCSB
    1986 GMC K3500 CCLB 4x4 Dump Flatbed (project)
    1979 Chevy C20 Scottsdales
    1979 Chevy Silverado K10 454 4x4

  13. #33
    Registered User Swearingsailor6's Avatar
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    Re: 1989 Suburban V1500 TBI 350 problems...

    Just pulled the codes....no codes but 12.
    1999 Chevy Suburban K1500
    1990 Chevy Cheyenne K2500
    1989 GMC Suburban V1500
    1988 Chevy Silverado K1500 RCSB
    1986 GMC K3500 CCLB 4x4 Dump Flatbed (project)
    1979 Chevy C20 Scottsdales
    1979 Chevy Silverado K10 454 4x4

  14. #34
    Registered User Swearingsailor6's Avatar
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    Re: 1989 Suburban V1500 TBI 350 problems...

    is there any other sensors I am missing?? Is there a crank position/cam position sensor?? What about the pickup-coil? Maybe the distributor is bad? I'm at a loss...anybody want a cheap suburban?

    I think its about time for a professional to take a look. I haven't had a car in an actual shop in over 10 years, i've always been able to figure out/find the problem and fix it myself. Maybe I'll just get them to do a diagnosis, pay them the 100 bucks or so to tell me what the problem is, and go from there. Maybe one of the new parts I put on is defective? I just don't know.
    Thanks for all the help guys.
    1999 Chevy Suburban K1500
    1990 Chevy Cheyenne K2500
    1989 GMC Suburban V1500
    1988 Chevy Silverado K1500 RCSB
    1986 GMC K3500 CCLB 4x4 Dump Flatbed (project)
    1979 Chevy C20 Scottsdales
    1979 Chevy Silverado K10 454 4x4

  15. #35
    Registered User robotic_junky's Avatar
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    Re: 1989 Suburban V1500 TBI 350 problems...

    There's no crank or cam sensor. There is a pickup coil in the distr.

    There should be 2 torx bolts holding on the TPS. Adjust it till you get .45 volts at idle. You can do this with the key on, but with the engine off to make it easier on you(just make sure the throttle is all the way back and is resting on the idle screw).

    One of the new parts could be defective. Let a shop look at it then.
    2005 Chevy Corvette LS2 DD 105k
    1991 Firebird n/a 190k
    1987 Silverado 350 HSR 230k
    1980 Bonneville 350 Olds. diesel 198k
    1993 G20 350TBI 252k

  16. #36
    Registered User Swearingsailor6's Avatar
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    Re: 1989 Suburban V1500 TBI 350 problems...

    I will adjust the TPS and probably pick up a new pickup coil. They are cheap, I think around 15 bucks. Can't hurt!
    1999 Chevy Suburban K1500
    1990 Chevy Cheyenne K2500
    1989 GMC Suburban V1500
    1988 Chevy Silverado K1500 RCSB
    1986 GMC K3500 CCLB 4x4 Dump Flatbed (project)
    1979 Chevy C20 Scottsdales
    1979 Chevy Silverado K10 454 4x4

  17. #37
    Registered User Swearingsailor6's Avatar
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    Re: 1989 Suburban V1500 TBI 350 problems...

    Question about the EGR. I pressed it while the engine was off to see if it moved freely, and it sounds like it is grinding or something when I push on it. Could that cause the slight missfire/poor idle if it doesn't close all the way due to carbon or faulty EGR, even if it is unplugged??
    1999 Chevy Suburban K1500
    1990 Chevy Cheyenne K2500
    1989 GMC Suburban V1500
    1988 Chevy Silverado K1500 RCSB
    1986 GMC K3500 CCLB 4x4 Dump Flatbed (project)
    1979 Chevy C20 Scottsdales
    1979 Chevy Silverado K10 454 4x4

  18. #38
    Registered User Swearingsailor6's Avatar
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    Re: 1989 Suburban V1500 TBI 350 problems...

    Well, I ended up putting on new distrubutor....the shop told me that was the issue, and it didn't change a thing. If anything, it runs worse. Is there a set-up or a reset that I have to do once I have the new distributor in position and timed? I set the timing at 0*....still no codes. i may try disconnecting the battery and letting the computer relearn.

    another issue I am having is a crazy rattling, which turned out to be my "torque rod" (not sure if this is the correct term) is loose and missing the bolt on the block...wonder if the rattling is causing my knock sensor to pick up a false knock and retarding the timing. If that is the problem, I am going to shoot somebody!! Now I just gotta find a bolt that will work.
    Thanks
    Ryan
    1999 Chevy Suburban K1500
    1990 Chevy Cheyenne K2500
    1989 GMC Suburban V1500
    1988 Chevy Silverado K1500 RCSB
    1986 GMC K3500 CCLB 4x4 Dump Flatbed (project)
    1979 Chevy C20 Scottsdales
    1979 Chevy Silverado K10 454 4x4

  19. #39
    Registered User robotic_junky's Avatar
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    Re: 1989 Suburban V1500 TBI 350 problems...

    Quote Originally Posted by Swearingsailor6 View Post
    another issue I am having is a crazy rattling, which turned out to be my "torque rod" (not sure if this is the correct term) is loose and missing the bolt on the block...wonder if the rattling is causing my knock sensor to pick up a false knock and retarding the timing. If that is the problem, I am going to shoot somebody!! Now I just gotta find a bolt that will work.
    That could give a false knock and the computer would retard the timing. I would fix that first then see if that fixes it.

    Setting the timing, you have to disconnect the pink wire near your brake booster. Then you can set the timing. If you don't disconnect that pink wire first, then you'll never get the timing right.
    2005 Chevy Corvette LS2 DD 105k
    1991 Firebird n/a 190k
    1987 Silverado 350 HSR 230k
    1980 Bonneville 350 Olds. diesel 198k
    1993 G20 350TBI 252k

  20. #40
    Registered User Swearingsailor6's Avatar
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    Re: 1989 Suburban V1500 TBI 350 problems...

    I did have the wire disconnected...and it stays at 0, I've checked in 4 different times since putting the distributor in. (disconnecting the electronic advance or pinkish/tan wire each time I check it.

    I wish I could hook up a computer and see what everything is doing while I am driving it. Is there any way to do this? Since it isn't thowing any codes, could there be a computer issue? It is setting the SES light when I disconnect the distributor advance to time it, but goes out upon restart. Should I disconnect the battery to clear the computer out, and have it relearn?

    Thanks for the help guys
    1999 Chevy Suburban K1500
    1990 Chevy Cheyenne K2500
    1989 GMC Suburban V1500
    1988 Chevy Silverado K1500 RCSB
    1986 GMC K3500 CCLB 4x4 Dump Flatbed (project)
    1979 Chevy C20 Scottsdales
    1979 Chevy Silverado K10 454 4x4

 

 
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