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4

If "injector cleaning" products helped but only lasted for one tank, I would try spraying Seafoam directly in at the throttle plate rather than putting an additive in your fuel. This should be a lot more effective at cleaning the injectors. If that doesn't help, my best guess would be that the vibration is from unequal power from one or more of the ...


3

The quick answer is - Yes, you will need a tune after installing larger injectors in your stroked 454. I was considering a big block swap into my RV so I've done a bit of research about tuning solutions. I was primarily focused on swapping in the L21, so I can't speak 100% to the differences between the Mark IV and Gen VI motors. This is what I do ...


3

I'm sure there are a plethora of custom programmers for the suburban platform. However if you're making such extensive modifications, you can probably look at some standalone solutions, like an Accel DFI or Haltech setup. Tuners typically dial in a baseline map and strap your vehicle to a dyno where they adjust fuel/timing curves according to wideband O2 ...


2

The Megasquirt 3 is the way to go giving you total control of your new setup. The EFI Analytics software, Tuner Studio and Mega Log Viewer make tuning easy but has a feature set that is up to par with pro tuning setups. The VE Analyzer Live will also help dial in various areas of your tune as will the Mega Log Viewer Scatter Plots. I would bet your new ...


2

One option you may want to consider is switching to a MegaSquirt fuel injection computer. It would be the pain of a fuel injection computer replacement, but they seem to be rather adjustable and configurable, if you are willing to go through the effort. We have had a couple of presentations at a local computer club from a guy who converted his 60s era ...


2

You replaced the engine mounts? I would guess that since you had to change the engine mounts that there is a good chance that the tranny mounts may need to be changed as well...what is the drivetrain assembly like in that car since it is fwd, sometimes if the driveshaft in a rwd car is unbalanced it will cause the car to shake


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Great question. I am making an educated guess here, so don't quote me in court;) Because piggyback chips interfere with your car's various inputs I would assume that you are correct and that your MPG score will be inaccurate as a result. I can't say by how much though. These chips usually give an MPG boost of around 10%, so I would imagine your true MPG ...


2

Both engines you mentioned have a supercharger and turbo combination. The performance difference is achieved by increasing the boost pressure to the engine. While this might be done only by using different ECU maps for small performance differences, the big performance differences usually require higher capacity parts as well, especially for the turbos, ...


2

Sounds like the Idle Air Control Valve and the Intake Manifold must be removed and cleaned. The vibration is worse when in gear than in neutral In gear there is a much greater load on the engine. Power is being transfered to the transmission and then to the wheels. This is going to cause the idle to drop a bit and this is where you'd feel the most ...


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Are you able to ask the previous owner for any history that could point you in the direction of the fault? This needs going back to basics. Check that you actually have petrol in the tank, could be anything in there, check for water or diesel or any other contamination. Don't go by the fuel gauge for tank level, it might be mis-reading. Take out the plugs, ...


1

With your added information, this sounds like there is a definite problem with the transmission. Your description leads me to believe it probably has something to do with the clutches being worn out in conjunction with low line pressures (or some such). I would definitely believe the transmission is due for an overhaul. If you pull the dipstick, does the ...


1

As Brian Knoblauch stated, fuel injection systems normally shut off the fuel delivery completely when the engine is in an "overrun" state, i.e. when you get off the accelerator completely with the vehicle in gear and the RPMs sufficiently high. In this sense, you can't be too lean in overrun--it's perfectly acceptable to have no injection at all. As for ...


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Throttle never reads 0% as the throttle plate angle is around 25~30 degree's. RPM should not 'hang' on a fuel injected bike, you may have leaking injectors or fuel pump regulator may not be working properly? Your much more likely to get after-fire in exhaust system on over run. What year is the 600? I know early ones had some issues but all the newer ...


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I had a Ford Probe with a 2.2L Mazda engine with nearly the same issue. I did everything you said, multiple spark plug changes, fuel cleaners, sea foam, etc. etc. The problem was the spark plug wires. They looked perfectly fine, but when I replaced them as a last resort the whole issue cleared right up. I later noted a small crack in one where the wire was ...


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If I recall right, those vehicles have a lot of vacuum hoses. Vacuum is only really utilized during idle, hence the disappearance of your problem. The sputtering is likely related to a dying vehicle, and as you accelerate it is able to keep running. Open your hood, and start looking at all the rubber hoses; compress them with your hand slightly and you can ...



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