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Missing on cold start

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  • Missing on cold start

    When I start my car from cold, its starts fine, but as I try to blip the throttle or steadily hold the revs up to let it warm through a little before driving off it misses a lot for about 5-secs and wont rev above 1000-1200 rpm, then it gets over it and is fine.

    Any ideas?
    Thanks

    Mags

    '90 M3
    '58 Austin Healey Sprite
    '02 Suzuki SV650S

  • #2
    Do you warm it up correctly?

    Comment


    • #3
      My car has the same problem. Juts warm it up past the blue line before driving and it should be OK.

      I suspect fault on low fuel pressure (22 psig) at idle. I had 30 psig at idle few months back and I had not have this car hesitation when driven immediately after cold start. I think my fuel pump is shot.

      audibm

      Comment


      • #4
        What should I be doing to warm it up then?
        I normally start- increase revs to about 2K and hold for a short while, then drive off keeping below 4K until the oil gets up to 70 deg.

        Could it be the pump as audibm suggests?

        Thanks

        Mags

        '90 M3
        '58 Austin Healey Sprite
        '02 Suzuki SV650S

        Comment


        • #5
          It will warm up even by idling for about 3 minutes.

          Another observation is that the car hesitates only when I blip with clutch engaged, engine cold. I have tried engaging the clutch at idle (without pressing gas pedal) and it pulls. I need 3 minutes anyway to maneuver in my apartment garage and it has been a routine for me doing this with idling RPM. By the time I am out of the garage, the temp gauge is pass the blue line. Once it is hot, I think the O2 Sensor sends signal to compensate the lean mixture.

          audibm

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          • #6
            I never liked the idea of holding the throttle at a certain RPM to warm the car up. I know people who start the car right up and rev it in the parking lot, a lot of good that does. Just my $.02

            Comment


            • #7
              I've got a much better solution than all of the above: iggomotiv chip!!!


              I just got the release version (I live local and he wanted me to try it out). They did some kind of magic with the cold start fuel map or something and the car is night and day better in the cold. Now when its 30 out and I start the car it just sits there and idles. When you use the gas going through the grears it doesn't feel like it doesn't want to go either. The car is WAY better in the cold. I can't even describe it. Pretend brand new Honda accord cold start or something like that. Power improvements aside, the chip was worth the money just for the cold weather starts.

              Robert M

              Comment


              • #8
                Try checking your plugs... and then check your cap & rotor too. Getting new gapped plugs did wonders for my car. It sounds completely different when you turn the key now and no more XXXXy jeeby shakes for the first couple minutes...

                90 Sterling 2.5L E30///M3 lifer
                97 Porsche Carrera S
                13 Audi S6
                SOLD 03 Audi RS6 daily
                GONE 88 E28///M5 project

                Comment


                • #9
                  WHOA....i dont like any of these start up procedures i am hearing..AT ALL...

                  IMHO....

                  DO NOT START THE CAR AND REV IT TO ANY RPM AND KEEP IT THERE

                  DO NOT LET TEH CAR IDLE TO WARM UP

                  You want to start the car and get to drving...keeping it in the 2 to 3k range to start and under 4k until the oil temp gets passed 120....The coolant gauge means nothing for engine temp...ignore that...not until the oil temp is up do you want to exceed 4K...

                  Thats my opinion

                  Comment


                  • #10
                    Originally posted by ADA///M
                    WHOA....i dont like any of these start up procedures i am hearing..AT ALL...

                    IMHO....

                    DO NOT START THE CAR AND REV IT TO ANY RPM AND KEEP IT THERE

                    DO NOT LET TEH CAR IDLE TO WARM UP

                    You want to start the car and get to drving...keeping it in the 2 to 3k range to start and under 4k until the oil temp gets passed 120....The coolant gauge means nothing for engine temp...ignore that...not until the oil temp is up do you want to exceed 4K...

                    Thats my opinion
                    Yup.

                    Comment


                    • #11
                      I personally thought it was good to let the car warm up for 2 minutes / 3 minutes at idle and then go the way that Adam says... No?

                      Comment


                      • #12
                        Hey guys,
                        If you can't fire up and go without having to do 1- 3 min. or 2K rpm warm-up heroics to keep your S14 lit or to get it running smooth, something is amiss. I fire mine up, and if its really cold, like <30 F, give it a small blip just to settle the idle and clear about 1K rpm, and off we go to the nearest Starbucks!

                        Plugs, cap, rotor, plug wires are possible culprits, as are vacuum leaks, but the one I would check first is the coolant temp sensor - that's where the injection system gets its engine temp info from.

                        I like what I hear about the iggo chip - sounds like it is doing what my right foot does!
                        "E30 M3 . . . it's the perfect toy for an upscale closet wild man." Car and Driver, 1988 M3 Road Test

                        Comment


                        • #13
                          Start up procedure:

                          Turn the key and start it up:
                          wait about 15 seconds for the oil to pressurize and reach your valvetrain/cams, and begin driving but don't exceed 3K for a while... hit 4K after it warms up a little bit... after it warms up fully, drive it like you stole it.

                          Don't let it idle for minutes in the beginning, it is not that great for the car...

                          90 Sterling 2.5L E30///M3 lifer
                          97 Porsche Carrera S
                          13 Audi S6
                          SOLD 03 Audi RS6 daily
                          GONE 88 E28///M5 project

                          Comment


                          • #14
                            Originally posted by Bavarian3
                            I personally thought it was good to let the car warm up for 2 minutes / 3 minutes at idle and then go the way that Adam says... No?
                            No. All that does is make the water temp gauge go up; and usually only half of the water is getting warm because you'd have to let it idle for a long time before the thermostat opened for full circulation. It also does almost nothing for oil temp which is what really matters.

                            Comment


                            • #15
                              Can someone explain why it is bad for it to warm up at idle? My car is at home in the gargage (I'm at school) and there is no one at my house that knows how to drive a stick. Thus it usually gets the warmup at idle treatment ever couple weeks (along with letting the parking brake up and letting it rollback a couple inhes to avoid flatspots on the tires).
                              "It is needless to say that self-propelling vehicles, like other machines, will never do as much for one who does not understand them as for one who does."

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