Motor Vehicle Maintenance & Repair Stack Exchange
Motor Vehicle Maintenance & Repair Stack Exchange

Questions tagged [fuel-injection]

A method of mixing fuel and air to be consumed by an internal combustion engine.

Fuel injection inserts fuel by mechanical or electro-mechanical means into an ICE (internal combustion engine). It replaces carburation on most modern vehicles and has transformed fuel delivery to become more efficient and environmentally friendly due it's reduced waste of hydrocarbons.

Fuel Injection

enter image description here

154 questions
29
votes
7 answers

We have fuel injection, why not air injection?

I'm finishing studying EFI systems, which set me thinking about induction more generally. We inject fuel from a high-pressure common rail for many good reasons. We're capable of making stratified burn within a cylinder, provided we have full control…
Daniel
  • 529
  • 1
  • 5
  • 8
17
votes
7 answers

How exactly does running fuel-lean increase the temperature of ignition?

I learned in this question that running an engine fuel-lean will increase the temperature of ignition, among other things such as causing problems with the catalytic converter. I have no idea how or why. How and why exactly does running fuel lean…
Max Goodridge
  • 7,957
  • 19
  • 53
  • 105
13
votes
2 answers

How to determine injector size for custom engine?

I've got a 2.5 L engine here for which I do not know the performance specs (yet), because it's customized. I need to select injectors for this build, but there seems to be only one equation on the interweb to get the injector size, and this takes…
Bart
  • 2,964
  • 1
  • 13
  • 28
11
votes
2 answers

2001 Infiniti QX4 rough idle - leaking fuel damper vacuum port

I have a bit of an involved problem, so I’ll break it down a bit and try to provide as much detail as possible. My main problem: I have a rough idle on my 2001 Infiniti QX4. It’s not extremely rough, but quite noticeable. It doesn’t happen all the…
atraudes
  • 707
  • 3
  • 11
10
votes
3 answers

Direct Injection Injectors - How do they prevent blow back into the fuel system?

So I imagine a direct injection injector as a fuel injector squirting fuel directly into the combustion chamber. The amount of pressure in the combustion chamber would seem to be enough to push the fuel back into the injector. Obviously that is not…
DucatiKiller
  • 32,976
  • 22
  • 150
  • 267
9
votes
3 answers

1999 Subaru Forester - bad acceleration, rough shifting

I have a 1999 Subaru Forester with an automatic transmission and a 2.5 Liter Motor. It has poor acceleration and rough shifting I started to notice 'hesitation' on take off. It just slowly appeared. Then I realized if I was trying to pass someone…
Steve Mcdaniel
  • 99
  • 1
  • 2
9
votes
3 answers

How much fuel does it take to start an engine?

I appreciate this is a question that can't be answered in facts and figures, so I'm after a general idea. I drive a 1986 Supra, which has a modest 2.8-litre engine. I often shut the engine off while waiting at traffic lights to save fuel, but I'm…
Gargravarr
  • 630
  • 1
  • 6
  • 11
8
votes
3 answers

Best way to repair a rotten fuel line?

I believe the feed line in my fuel system has rotted. If I'm going to cut out the rusted areas and splice a new line in... Is it best to flare a hardline? Is steel the OEM material? How would I connect the two? Compression fittings? I'm…
ohmmy
  • 615
  • 2
  • 10
  • 16
8
votes
1 answer

Changing from two heated O2 sensors to a single O2 sensor

I'm going to be removing a Motorcraft 2150 carburetor in a 2.8L V6 and swapping it for a Ford CFI (and ECU) from a 3.8L V6. I've just recently pulled everything (ECU, throttle body, sensors, harnesses, etc) from a Mercury Cougar. When I was removing…
Kevin Evans
  • 1,206
  • 4
  • 13
  • 36
8
votes
2 answers

Why is the effect of a bad fuel pump more noticable at higher speeds?

I get that the main effect of a bad fuel pump is that the engine will cut out at higher speeds, and that this is often not easily noticeable until that happens because there are little or no prior indications that I am aware of. And that this…
Max Goodridge
  • 7,957
  • 19
  • 53
  • 105
8
votes
1 answer

What are some Seafoam Alternatives

I read this procedure for using Sea Foam ( also listed on their website ) to clean the intake manifold, injectors and crankcase. I think this would be useful for my vehicle, however Sea Foam isn't available where I live. There are some Liqui Moly…
Robert S. Barnes
  • 15,780
  • 72
  • 157
  • 249
7
votes
2 answers

I have an issue with Stepping on gas and no increase in speed

It only happens rarely.. but sometimes when stepping down the gas it would suddenly max out the speed gauge, and you hear the very loud engine noise as if i stepped down the gas all the way, but what is weird is the fact that car doesn't accelerate…
Victor Weng
  • 73
  • 1
  • 1
  • 3
7
votes
9 answers

Strong vibrations when idling even after replacing engine mounts (automatic transmission)

I have a '93 Acura Integra with automatic transmission. Ever since I got it some time ago the car has been vibrating a lot when stopped at a light, for example. The vibration is worse when in gear than in neutral, but it's present in both cases and…
vlsd
  • 1,009
  • 4
  • 11
  • 23
7
votes
1 answer

Is an injector an injector?

In general terms at least - lately the engines I've been working on are diesels and I've never had to troubleshoot fuel injection problems on gasoline/petrol engines. So, I'm wondering, how many variations are there on fuel injection systems – big…
dlu
  • 14,506
  • 8
  • 52
  • 85
7
votes
1 answer

Warm fuel injected engine stutters when accelerating

I have a 1994 Honda Concerto 1.5l gasoline car, fuel injected. When the engine is cold there are no accleration problems. But once it warms up it stutters if I step hard on the gas. When it does this is only stutters until it reaches a certain…
ssimm
  • 171
  • 1
  • 5
1
2 3
…
10 11