Hot answers tagged

9

Background You asked Why is the effect of a bad fuel pump more noticeable at higher speeds? I assume that by 'higher speeds' you mean engine speeds or RPM's. During high RPM operation an ICE consumes more fuel so the flow rate into the fuel injection system or carburetor increases at higher RPM's. This taxes the fuel system and puts more load on the ...


7

tl dr - To directly answer the question, SeaFoam is a pure petroleum product. If an alternative product is made up the same as Seafoam, then I'd think it would work just fine. If its makeup is not similar, you probably won't see the same results. Below is what you are looking for and a recipe for making your own substitute. I found this answer for a SeaFoam ...


7

You have a qualitative description of what happens, but let's break it down to a smaller scale. When we talk about "temperature" of something, we are really talking about how fast the molecules are moving around and bouncing off each other. "Temperature" is really "kinetic energy". And it turns out that there are other types of energy besides moving around ...


6

The injector has a plunger/pintle which is controlled by an electromagnet. The humming you heard is from that. The plunger/pintle has a spring which pushes back against the electromagnet so when the power is shut off, the plunger will close and stop the flow of fuel. This causes the hum. Here is an example of how an injector is built: When the power is ...


6

Direct Injection has a lot of advantages over the MPFI or port injection and its the way of the future. It improves mileage through a stratified charge engine process(basically staying as close to the stochiometric ratio as possible this achieving better burn. Lower emissions. Prevents engine knocking/detonation. Better control of the engine since before ...


6

It's a demand vs supply deal The fuel pumps found in most OEM fuel delivery setups today are driven by an electric motor that is running at a fixed speed. This effectively fixes the flow rate provided by the fuel pump. The majority of fuel-delivery systems found in fuel-injected vehicles are return-style. What this means is that the fuel injectors will ...


6

Funny you should ask this Max :) First lets make sure of our definition. Running an engine lean means changing the air / fuel ratio to have more air than is ideal (14.7:1 air to fuel). In my reading there are two effects. First, the fuel is an atomized liquid which has a cooling effect on the combustion chamber. So less fuel, less cooling effect. Second, ...


5

Those are metric screw dimensions. M10 means a 10 millimeter outer diameter for the bolt or whatever piece it is; M12 means 12 millimeters. The part after the 'x' is the pitch -- how many threads there are per some unit of length. To figure out which you have, you can measure the existing part with calipers and a thread gauge. You might also try calling ...


5

That pipe probably goes to the tank too, it is just there to let air out of the tank while adding fuel down the main pipe. I believe that your additive will be in the fuel.


5

If you have ever seen an oxy-acetylene torch being used, you will have noticed that before the oxygen is turned on, the torch has a bright yellow flame. This is the fuel burning in a less than ideal amount of oxygen. The flame is relatively cool and it produces a lot of soot. When the oxygen is turned on, tthe flame turns blue and becomes hot enough to ...


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 ...


4

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 ...


4

I've had this problem with my Honda accord 96 for an entire year and just figured out what was causing the vibration in idle mode. Changed mounts, cleaned air idle control valve and throttle body . Took it to a friend who in no time told me it was a BAD COIL not producing enough power. So check out your COILS


4

Yes, it will probably be necessary to fix the problem in order to pass emissions requirements. The secondary air injection pump on the Beetle is apparently used to accelerate the transition from cold start to hot catalytic converter operation. Without this system, it will take longer for the catalytic converter to reach operating temperature. The ...


4

Don't be hasty to replace the whole CIS! Based on the Bosch Fuel Injection & Engine Management book, here are a few things to investigate as possible causes for hot-start issues (inability to start when the engine is warm): Cold-start valve leaking or operating continuously The cold-start injector is designed to enrich the air-fuel mixture while the ...


4

You can do this through the OBD-II protocol (SAE J1979).: +------+-----+-------------------+ | Mode | PID | Description | +------+-----+-------------------+ | 01 | 5E | Engine fuel rate | ( liters/hour ) +------+-----+-------------------+ | 01 | 43 | Engine RPM | +------+-----+-------------------+ You can use the RPM to figure out how ...


3

Here are the instructions I found from this document. It looks as though you have to program the pump and injectors into the PCU using some type interfacing tool. I would bet this is probably only available through the dealer, though I could be wrong. Check with a local shop, but would bet this is not something you can do at home. The document has several ...


3

Here is an image with the different types of injectors. It looks as though the brown top injectors you are talking about are 36 lb injectors, meaning they can flow 36 lbs of fuel per hour at the stock fuel pressure. I don't know what the fuel pressure these were rated at for 36#'s, but if you have lower or higher fuel pressure in your vehicle, this will ...


3

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 ...


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 ...


3

Your post raises several possible issues that you could eliminate to start with. Firstly if it is still on an incline I suggest you push or tow it to flat ground. It will help rule out fuel starvation and make it easier and safer to work on. Second i would drain the fuel tank and put fresh fuel in it. From there you can try starting it a few times. ...


3

Thanks for the great detail. Considering this is a bit of an odd issue, I'll try thinking outside the box a little. But first I would use a multimeter to test the coolant temp sensor, then o2 sensors. Perhaps even a quick check of the upper radiator hose to make sure the thermostat isn't stuck open. I say to check these first because it sounds like ...


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

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 ...


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


2

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

Need the FI Error Codes First There multiple possible answers as to why your FI light is on but this is a bit of a guessing game unless you pull codes using the following procedure. This is a workaround from using the official Kawasaki dealer tool to get your fuel injection related error codes. Once you have collected the error codes you can now begin to ...


2

This essentially the same answer as your other question related to poor running, thee are instructions on how to pull your Kawasaki error codes. This procedure works for all Kawasaki EFI systems from 2001 to 2015 Need the FI Error Codes First There multiple possible answers as to why your FI light is on but this is a bit of a guessing game unless you pull ...



Only top voted, non community-wiki answers of a minimum length are eligible