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Backfires at 5k in 3rd gear and up.

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  • #31
    Thats what i wanted to know thank you sam. Could it have a chance that the duralast cps messed up my temp sensor. Iv see it done. But i do not know if every car effects the same way. It looks like im going digging this weekend

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    • #32
      Oh yeah. I just replied the cam timming completely. I have done that prosses on these turds many times. I know thats diled in. I doest run rough i just have to keep on the throttle wile taking off. Then at 4k she flys

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      • #33
        What codes are being set? This can help a lot. Also, once the engine is warmed up and you are moving, where is your temperature gauge at?
        Ian---The Fat Ass

        1995 SL2-High compression engine FOR SALE
        2010 Chevy Cobalt SS- tuned with plenty of goodness
        2002 SC2-New daily
        2017 Kawasaki Ninja 650 KRT- got a stupid deal
        2003 Ford Taurus SES- free daily beater

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        • #34
          I cant find the receipt that has the code on it but the code basically said Bank 1 high circuit which lady was saying the brand new O2 sensor I just got is bad already already clear the codes and it came back on again I did change the temperature block sensor and air temperature sensor that cleans it up a lot but still has hesitations about 2nd gear now so I'm thinking it's something to do with the fuel pump more of the fuel pump relay sometimes I don't hear that pump click on but I cranker over and it takes about a few seconds then she starts right up I let it sit for a minute warm up a little bit and I did a few tests on it when I try to get on it well while she's warming up she hesitates really bad at about 4,000 5000 RPMs but after she fully warms up it goes away slightly I'm really thinking the fuel pump relay might be going in and out causing lean-to Rich mixtures at random times I looked up what Sam call me about the pump once it's on it's on but the relay controls the flow to the injectors now with this quantum fuel pump I didn't get the check valve that the highly recommended me to get to keep it hold pressure I wonder if that little fucking check valve also might be the problem it's a returnless system I'm about to just converted to return fuel system I found a 97 wagon with a full complete untouched return fuel system if you have any thoughts sarurnspeed don't be shy. Sam I know what you know you're going to put your good Yoda advise. This is my daily which I will be running a mega squirt and it here soon probably for a little boost getaround car my other one will be hiboost which I'm working on right now on the side

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          • #35
            Never rely literally on what the diagnostic code says. This is where datalogging is great to have. The codes lead you to what might be causing the issue. The fuel pump relay will either work or not. It won't go in and out. If it somehow did, there is a different reason behind why it is happening. The check valve thing with the fuel pump concerns me as it is not needed. Fuel pressure will bleed off as it sits, and is perfectly acceptable. That is why the ecu primes the pump upon key on. I wouldn't go about swapping to a return style fuel system till this issue is resolved. Modifying a system while there is an issue is a recipe for further issues.

            It might be worth checking spark. Checking ICM surface to trans, primary and secondary coil resistance, plug wire resistance. It kind of sounds like a potential for weak spark. The other thing is have you done a compression check?
            Ian---The Fat Ass

            1995 SL2-High compression engine FOR SALE
            2010 Chevy Cobalt SS- tuned with plenty of goodness
            2002 SC2-New daily
            2017 Kawasaki Ninja 650 KRT- got a stupid deal
            2003 Ford Taurus SES- free daily beater

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            • #36
              I've done a compression test I'll try to upload them here to show you guys results. ignition modulator I did have a problem with that a while back I in just swaped icms a wile back. Im finding out every duralast part I get from autozone. Has been failing within 4 to 6 months. Like its brand-new. Ilk di a full test this weekend. The cps was the main problem. Then after i got her well runnjng. Come to find out she wouldn't go past 5K that's about this whole subscription I did this has been an ongoing battle I finally said screw it bought a standard ignition CPS and also she fired right up 5K backfire gone but also after all that I've been having issues with my car I changed my O2 sensor air temperature sensor temperature block sensor idle air control valve which I have sought three more of those so that's not an issue the wires I possibly need to change they are MSD and lately I don't like the product I've been impressed with their product. Changing the temperature block sensor air temperature sensor cleared up a lot of the mess Mo see what she does a low RPMs she struggles it feels like something to do with the fuel. Because when I had about 3800 RPMs she starts to go go buck wild like it's back to normal high RPMs though it's strans. This is why I'm getting confused that have mid levels of operation she just fine but at low and high are RPMs she struggles if this info I just gave you give me a little more helpful for you let me know I will try a full ignitions test this Saturday kids are out for the day.
              Ps thank you for that information

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              • #37

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                • #38
                  Coil pack i cleand the ground and the cylinder 1 prong witxh was corroded. It needs to be swapped out but it runs a hell of a lot better than it did so I'm just going to buy all new coil packs these be done anyways I'll go from there

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                  • #39
                    Sweet. The nice thing about these cars is they're relatively simple to repair :P
                    Sixthsphere.com Owner
                    2016 Honda Fit
                    2002 Saturn SL1 - RHD
                    2002 GMC Sierra 2500HD Duramax

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                    • #40
                      Yes the do. Its just tracing it down. By step by step. This has been the easiest car to work on and now i kwow my full electrical symptoms. I don't think I'll have any more questions except with the ms ill be running in bolth my sl2s

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