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  • 94 5.7L TBI dies at idle or when coming to a stop

    hey i have a 94 z71 5.7L that will die at idle or after i let off the fuel peddal while coming to a stop or corner but it only does it sometimes after it dies it takes a whole lot of cranking with my foot to the floor to get it started again and have to keep the rpm's up to keep it running then the next corner or stop i come to it dies again unless i put it in nuetral and keep the rpm's off idle
    the check engine light is on it is code 43 knock sensor circuit not thinking that that would make it stall but just before it does stall the check engine light goes off then all dash warning lights come on then engine light comes on again
    what i've changed
    fuel pump
    fuel filter
    iac
    coil
    ecm
    anybody have any idea's???? please !!!!!! help!!!
    this thing is really starting to piss me off lol
    Last edited by Tim94; 12-21-2009, 08:50 PM.
    94 silverado z71 6" lift 35" tires 4.56 gear ratio
    02 silverado stock
    81 serria stock

  • #2
    Re: 94 5.7L TBI dies at idle or when coming to a stop

    The knock sensor may be doing it. I had a 91 Corsica, different fuel system, but it went bad. Driving or at idle it would surge real bad. changed the sensor ran great.
    Don't remeber if you can test the knock sensor or not. It should be cheap if you want to try to replace it. Not hard to do.
    How does your air filter look? When was the last time the throttle body was rebuilt? Kit cost about 30 or 40 bucks. It also comes with a FPR which could be part of your problem. Good time to clean your TBI too.
    I would also check your timing.


    03 Silverado ECSB, Dmax, Allison, 3.73 G80
    96 Silverado ECSB, 350, 4L60E, 3.73's Powertrax Locker
    05 Cavalier
    74 Corvette Stingray, 350, 4 speed
    49 F-1, flathead 6, 4 speed, 2wd, unknown rear end. Old rust bucket.

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    • #3
      Re: 94 5.7L TBI dies at idle or when coming to a stop

      egr

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      • #4
        Re: 94 5.7L TBI dies at idle or when coming to a stop

        egr is new as well

        when it runs it runs great no surging nothing then when it wants to it dies i don't think the tb has ever been done i've only had it for five years
        94 silverado z71 6" lift 35" tires 4.56 gear ratio
        02 silverado stock
        81 serria stock

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        • #5
          Re: 94 5.7L TBI dies at idle or when coming to a stop

          i was thinking the temp sensor on top of the intake manifold.

          95 GMC Yukon 1500 4X4

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          • #6
            Re: 94 5.7L TBI dies at idle or when coming to a stop

            why would u say that ??
            94 silverado z71 6" lift 35" tires 4.56 gear ratio
            02 silverado stock
            81 serria stock

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            • #7
              Re: 94 5.7L TBI dies at idle or when coming to a stop

              IAC valve, may be dirty or slow to react, clean it first but you may wind up replacing it. post back with the results please.

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              • #8
                Re: 94 5.7L TBI dies at idle or when coming to a stop

                iac has been replaced throttle body removed and cleaned out iac port still acting up ran jumper wire from battery to distribution block i think the fuesable link is acting up in the middle of testing get back to you on that one
                94 silverado z71 6" lift 35" tires 4.56 gear ratio
                02 silverado stock
                81 serria stock

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                • #9
                  Re: 94 5.7L TBI dies at idle or when coming to a stop

                  and of course now it won't die even without the jumper on it so i don't know if that was it or not
                  94 silverado z71 6" lift 35" tires 4.56 gear ratio
                  02 silverado stock
                  81 serria stock

                  Comment


                  • #10
                    Re: 94 5.7L TBI dies at idle or when coming to a stop

                    ok so that wasn't it the iac i replaced was from a scrap yard and it did run alot better after i replaced it for about two days then it started acting up again should prolly try a new one i guess
                    94 silverado z71 6" lift 35" tires 4.56 gear ratio
                    02 silverado stock
                    81 serria stock

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                    • #11
                      Re: 94 5.7L TBI dies at idle or when coming to a stop

                      have the timing checked.. make sure that the idle advance wire (can't remember if that's the name or not) is disconnected.. check your distributer for moister/play.. you shouldn't be able to turn it because that bolt should be tight enuff to hold it..

                      do you have lifters ticking or other noise under the valve covers? the knock sensor senses spark knock.. it can be very sensitive and retard the timing for things like that.. could also be bad gas.. have you eaten a burrito lately?? or more appropriately taken it to a diff gas station? or the cheapest gas station around?

                      edit: forgot to add - check the wire that connects to the knock sensor.. mine is located almost at the bottom of the engine..it's a 1 pin connector in mine... behind the oil filter.. "ish" i had a bad connector and they are notoriously so.. if you do change the knock sensor change that connector as well
                      Last edited by AllenKidd; 12-22-2009, 12:20 PM.

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                      • #12
                        Re: 94 5.7L TBI dies at idle or when coming to a stop

                        i checked the timing it's good it has been doing this since the end of last winter so i have been to many different gas stations so bad gas is out the knock sensor i unhooked completely and it did;nt make a differens
                        i really think it's the iac i did change it and it did run good for a couple days but it was from a junk yard i unscrewed the iac a bit from the throttle body just until it started to rev up a bit and it hasn't died since well until it screwed it self back in then it did but a little adjustment and a way i went
                        94 silverado z71 6" lift 35" tires 4.56 gear ratio
                        02 silverado stock
                        81 serria stock

                        Comment


                        • #13
                          Re: 94 5.7L TBI dies at idle or when coming to a stop

                          Originally posted by 350CHEVYROB View Post
                          i was thinking the temp sensor on top of the intake manifold.
                          YES! exactly what I was going to say, buddy had the same problem, I replaced that and it was fixed, when it fails the truck thinks its VERY cold out and over compensates for it.
                          '84 K30, 7" lift, Converting to International Diesel HP 60/14 combo
                          '88 GMC Suburban V2500 5" lift 60/14 with 4.10s 5.3 LS swap TH400/NP208
                          '94 GMC Suburban K1500 350/4L60e with updated heads, mild upgrades
                          '77 Ford F250 High Boy 400/C6/Divored 205 44/60
                          Veteran of Afghanistan (Army SSG)

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                          • #14
                            Re: 94 5.7L TBI dies at idle or when coming to a stop

                            ok up date changed knock sensor which got rid of my check engine code but still dies just changed the temp sensor but haven't got to try it yet sry it took so long for an update just got the net again
                            94 silverado z71 6" lift 35" tires 4.56 gear ratio
                            02 silverado stock
                            81 serria stock

                            Comment


                            • #15
                              Re: 94 5.7L TBI dies at idle or when coming to a stop

                              Just a suggestion, recheck your ignition coil and also check to see if the plug gaps are in spec and to see if there's any carbon fouling on them. I had a similar problem on one of my vehicles and found out that there was too much gap on the plugs. Regapped the plugs to spec and problem gone.


                              2003 Tahoe Z71s, K&N filter, 6" Lift, Rancho Shocks, 16X10 Raceline Wheels, 35" Toyo MTs

                              1995 Silverado Z71, K&N filter, 4" Lift, Rancho Shocks, 17X10 Centerline Wheels, 35" Toyo ATs

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