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Backfires at 5k in 3rd gear and up.

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  • #16
    Originally posted by Satty98 View Post
    I did just got done slapping a new pump in. It's a high flow pump. The same as I'm use for my other satty for boost. It's a quantum 255lph. Their is a little bit of modding to do if you use their filter witch I did the mod. But she starts up quicker and better. My o2 will be in on Tuesday. They sent the wrong one. I'm running 92 headers with is the 14mm thread and they sent me the 18mm I havent test drive it. The wife's out and I at home with the kids. Tomorrow I'll take her for a test drive and I'll check back in to see if I have any progress
    I cannot find a 14mm O2 sensor for my 1992 header set either. I ordered two off of rockauto and they both came as 18mm. Update this if you find one, please. Thanks.

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    • #17
      I found one. Autozone it took 5 days but they have denso at the where house. Rockauto.com did the same thing to me. You can buy a 21/32s drillbit and a 18mm tap and that will let you able to use the new o2s

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      • #18
        So for some reason I have low fuel pressure to the injectors. I did put a quantum 255lhp fuel pump witch is working correctly. But for some reason the fuel filter witch I replaced is toast. It's only a year old. But. The old pump that I just replaced was literally falling apart. I did find aluminum in my tank. Witch I think my old pump sucked one up some how. The filter to the old pump the screen before interning the tank had a hole in it. I bet I have. Peace of aluminum in my filter . Does anyone know of a returnless fuel filter that will allow more flow to the injectors. My turbo satty is running a return fuel system. I did find one that close to our design. It's for a vw 2.0 engine. It can hold up to 5.9 bar of pressure on this filter. But if anyone else knows of anything else. Share the knowledge

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        • #19
          Return style is the way to go for turbo. The fuel pressure will increase with boost. With a returnless style as the boost increase the effective fuel pressure is lower because there is less of a pressure difference between the fuel and the intake manifold...this will make the injectors act like smaller injects as the boost comes up.
          -6S Resident Mechanical Forensics member #001.
          1995 SC2 Turbo 3.6L DOHC, 6sp manual, Ford 8.8 rearend running on MS3x.
          1998 F-250 5.4L triton...stock.

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          • #20
            So. I changed the o2 with a denso put a fuel pump and filter and after the satty warms up. It's doing the same thing. Backfires at 5 grand but no as bad. But I got a code. I got a p0138. O2 high circuit voltage bank 1 o2. Thats a brand new o2. I'm a little lost here. Ow yeah the cank sensor I also replaced. That what got my car started. Help guys. Anything helps

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            • #21
              And now. I'm not throwing a code. This is starting to trip me out.

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              • #22
                Any updates? What kind of shape is the downstream 02 sensor in? With no codes it is quite strange...

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                • #23
                  Actually today
                  i had a thought i got a duralast crank sensor found out that what the problem was. I went to o'riley and got a standard ignition cps and boom. Shea back to normal. Fair warning to all. Dont get the duralast cps from autozone. Pure crap
                  im a damn good tunner but fuc$ . Selling garbage cps sensors. Never again.

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                  • #24
                    I have found on more than one occasion that anything with the name "Duralast" on it is pure crap.
                    -6S Resident Mechanical Forensics member #001.
                    1995 SC2 Turbo 3.6L DOHC, 6sp manual, Ford 8.8 rearend running on MS3x.
                    1998 F-250 5.4L triton...stock.

                    Comment


                    • #25
                      Just about everything autozone has now is crap almost. Im just got an o2 from them its a denso but im getting a bank 1 high circuit readings. I dont know whatbis causing that. At low rpms she slugs really bad until i giver some gas. And about roughly 3800 she rips right up. The pump did sugest a check valve to be installed they have one for my pump for 8 dollors. Do you think that the pump is keep good pressure at lower rpms with the ecm is telling what the stock pump is supposed to do. Any thoughts guys.

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                      • #26
                        High O2 readings means that it is running rich. As of fuel pressure, hook a gauge up and find out. It is the only way you will know. If it is returnless, the fuel filter controls pressure. The pcm just commands the relay to power the pump with ignition on.
                        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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                        • #27
                          Saturnspeed_12 i i kindov figured. Im going to hook up my wideband and see how ric he im running then. These Saturn's are way different then a honda lol. Im going to find a way to lean it out a little. Im old school resistors lol. I know its not healthy for tbe pcm. But pcms are a dime and a dozen. Now i know this quantum fuel pump is really working. Its Its the voltage signals run higher

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                          • #28
                            Voltage to the pump won't be the issue, unless you are somehow pushing probably 16+volts to it and the fuel filter regulator is not functioning. You should have at least 44psi with the engine running. There is an absolute minimum of 40psi, but with voltage that low, you either need a new alternator or figure our why voltage to the pump is low.
                            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

                            Comment


                            • #29
                              The pump is capable of puting out 14 volts. My battery is in need of replacing. So you you think i have lost of voltage. Ill do a volt check. Its a big possiblity that my battery is shot

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                              • #30
                                Originally posted by Satty98 View Post
                                Just about everything autozone has now is crap almost. Im just got an o2 from them its a denso but im getting a bank 1 high circuit readings. I dont know whatbis causing that. At low rpms she slugs really bad until i giver some gas. And about roughly 3800 she rips right up. The pump did sugest a check valve to be installed they have one for my pump for 8 dollors. Do you think that the pump is keep good pressure at lower rpms with the ecm is telling what the stock pump is supposed to do. Any thoughts guys.
                                The pump is either on or off. The PCM doesn't send it any "signal". The pcm activates a relay and that relay stays on while the engine is running.

                                With it being a turd a low end I would start with the coolant temp sensor and inspect the EGR valve for sticking open.
                                Cam timing being off could make it run like shit too.
                                Also, you can go over the wiring to the o2 sensor and make sure it is not chaffed and getting a short to voltage or short to ground.
                                -6S Resident Mechanical Forensics member #001.
                                1995 SC2 Turbo 3.6L DOHC, 6sp manual, Ford 8.8 rearend running on MS3x.
                                1998 F-250 5.4L triton...stock.

                                Comment

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