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Questions tagged [fuel-injectors]

A device that meters the proper amount of fuel into an engine cylinder. It is controller by the engine control computer.

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2answers
1k views

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 ...
9
votes
1answer
402 views

Ford Tractor 5600

This is a older tractor. My question relates to the fuel system. The older fuel injectors don't have any external seals? All of them seat and 3 don't leak but one does. I was looking for a seal but ...
7
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2answers
1k views

How does a cobra alarm system disable starting

I have a 1998 Mazda 626 with a cobra Auto security system. I suspect some problems I have been having are related to this system and was wondering exactly how it disables starting. Specifically one ...
7
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1answer
693 views

Volvo 2.0D engine “self-oscillates” after changing timing belt and adjusting fuel-injectors

I recently had the timing belt and water pump changed on my Volvo s40 (2006 2.0D diesel). The mechanic also cleaned and adjusted the injectors. After the service I noticed that att some rpms the ...
7
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1answer
99 views

Fuel injection modification for increased displacement

I am working on a 2 cylinder, 250 cc motorcycle which I am increasing the displacement to about 350 cc but I have no way of remapping the ECU. Is it possible to get a satisfactory result by changing ...
6
votes
4answers
310 views

Why isn't injection managed to use the entire intake stroke?

As far as i know, electronic fuel injectors only know two discrete states, on or off. Under light load (ie. low rpm and throttle) the injector doesn't have to deliver much fuel. So naturally the ...
6
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2answers
177 views

How can vehicles run on E?

Sorry if this topic is too open ended I'm new to this site. I am studying engines and how they work and I keep wondering, how do cars with no gas still manage to run for a few extra miles? If you ...
6
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2answers
4k views

Fault code 27 with engine light on '94 Jeep Cherokee

I own a '94 jeep cherokee 4.0 liter. The 27 code indicates the injector circuit is not syncing with the input signal. How do I trouble shoot this?
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1answer
4k views

Do you need to replace injector seals if they are removed from the intake?

Car is a Audi S5 2008, direct injection, 8 cyl. I will be removing the intake manifold to clean the intake ports of carbon. In the process, the fuel rail needs to be removed. The injectors aren't ...
6
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1answer
216 views

Do I have a fuel pressure or injector problem, or am I just chasing ghosts?

I just did a fuel volume test on my 98 Mazda 626 2L GF. According Tim Giles book Automotive Service: Each injector is energized for 15 seconds... Variations of more than 5 ml calls for replacement ...
6
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1answer
1k views

Do I have a fuel pressure or injector problem Part 2

This is a continuation of my previous fuel pressure / injector question. So the missing part for my fuel pressure gauge came in and I was able to do a few more tests. The first thing I think is that ...
6
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1answer
535 views

Can Getting Fuel Injectors or Ignition Coils Wet Ruin Them?

I have a 2005 Suzuki Forenza Wagon where I recently cleaned the engine compartment. I was a little careless during the cleaning and water got in under the spark plug wires to sit around the top of the ...
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3answers
5k views

How to fix an injector leaking into the manifold?

I suspect I have an EFI common rail injector that fails to hold pressure and slowly leaks petrol into the manifold when the engine is shut down (and possibly while running). I am interested in why ...
5
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2answers
908 views

Do I need to eliminate old gas before changing fuel injectors?

I have a truck with a full tank of gas (12-16 gallons?) that's been sitting for 12 months and I'm about to change the fuel injectors. The truck can barely make it around the block due to stalling out ...
5
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2answers
15k views

RPM drop when coming to a stop in neutral, Civic 06

Let's say I'm getting off the freeway, I press the clutch, shift out of 5th to neutral. At that moment my Civic DX would usually drop to about 1000 rpm at idle. For the past month it drops too low, ...
4
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1answer
389 views

What does a good injector spray pattern look like for a four hole injector?

I have four hole injectors like this on my 98 Mazda 626 2L GF: What does the proper spray pattern for this type of injector look like?
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3answers
362 views

Are low-impedance fuel injectors just a placebo?

From this Hot Rod article, I understand that low-impedance injectors run higher current and open and close faster than high-impedance equivalents. The heating effect of the higher current also results ...
4
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2answers
55 views

Rebuilding EV1 Injectors

I recently bought the parts to rebuild EV1 (34.6# @ 43.5psi) injectors. The parts include the microfilter, flat support disk (for the injector end), and the supporting top cover (for the fuel rail end)...
4
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3answers
3k views

Why is my car hard to start only after a few hours?

Car: Audi S5 V8 FSI, Direct Injection I posted a question related to this but might not be the correct issue: Do injectors leak or injector seals leak? Background 2 months ago (1200 km) I performed ...
4
votes
1answer
262 views

Is 12 volts safe for testing injectors?

I'd like to do a volume test on my injectors, and was thinking that I would activate each one by jumpering it to the battery ( about 15 seconds per injector. ) The thing is that if I understand ...
4
votes
1answer
885 views

Do injectors leak or injector seals leak?

Car: Audi S5 2008 I have a problem in my car where sometimes my car will be hard to start after driven for a while. Normally if I floor it close to where I stop the car, it's harder to start. When I ...
4
votes
1answer
715 views

What sort of maintenance do GDI injectors need?

The 2014 Lexus IS350 reminds the driver that "injector maintenance" is required every 10,000 km. Besides this advisory annoyance, as far I can tell there is no difference in drivability. I don't ...
4
votes
1answer
74 views

Diesel Injector Well full of Carbon

While looking over my friend's 08 Kia Carnival J3 2.9L Turbo Diesel, I noticed a strange huffing noise. After removing the decorative engine cover I discovered this: This injector well is filled ...
4
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2answers
679 views

Why are my injectors different colors when they all have the same flow rate?

As can clearly be seen in the picture, the injectors on my 98 Mazda 626 2L GF are different colors: This is even mentioned in the official Workshop Service Manual: However, both according to the ...
3
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1answer
179 views

Why Ride by wire when the fuel injector is there

I feel confused on understanding this system on 1. The difference between FI and Ride by Wire 2. how it improves the fuel efficiency when compared to the ride by wire system and conventional ...
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2answers
599 views

What fuel injectors I have to install? [duplicate]

Recently the fuel injectors of my Mazda 3 SP5 2006 2.3L stop working, they still works, but my mechanic said that are in bad conditions. Anyway, when I search the fuel injectors for my car, I found ...
3
votes
1answer
130 views

Why do injector prices vary so vastly?

I'm gathering components for my setup, and at the moment I'm looking for injectors. Those things go from $8 at AliExpress to $150+ per piece at the "genuine stealership". One thing really ...
3
votes
1answer
94 views

How Long to Power the Injectors for a Fuel Pump Volume Test?

I want to do a fuel pump volume test on my 98 Mazda 62 2L GF, but the WSM doesn't say how long to energize the injectors: I'll probably activate the injector by back probing the injector ground wire ...
3
votes
1answer
3k views

No voltage on injector lines following engine rebuild

I have a 2012 Ford Fiesta 1.4 L TDCi. It was starting normally but the engine had major mechanical problems so I have rebuilt it and put it back in without touching any electrical part. Now I'm ...
2
votes
2answers
2k views

Best practice for replacing fuel injector o-ring?

Never worked on fuel side o a car so have a few concerns: What's best way to relieve fuel pressure? After swapping o-rings, does a lubricant need to be added to the o-ring to prevent damage when ...
2
votes
1answer
85 views

How Carburetor/FI will handle fuel supply in high inclination angle

Lets consider, we are going in inclination. (ex:some where > x Degrees). At this time, how carburetor will pump the fuel into the cylinder. Since of high inclination, it is very difficult for the ...
2
votes
2answers
788 views

Difference between fuel injectors and emissions standards

I have a 2004 Honda Accord EX Sedan with a 2.4L I-4 with California emissions and 250k miles on it. I desperately need to replace my fuel injectors but the price is steep! Can someone explain to me ...
2
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1answer
435 views

Injector leaking/seeping clean diesel over nut/body

I've got a 2005 Mazda 3 (ford inside), engine DLD-416/DV6/MZ-CD 1.6 Diesel, 109 PS. When I was blanking the EGR valve I saw some diesel surrounding the injector bases on all the four injectors. The ...
2
votes
1answer
5k views

Leaking fuel injector

If the body of a fuel injector is leaking (allegedly) and flooding a spark plug, there is any chance of fixing it cleaning the injectors or do I have to replace it 100%? How can I determine which ...
2
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0answers
54 views

1999 Chevy Suburban 5.7 - What is “Valid Reference Pulse”

Searching google for that exact text in quotes (what the scanner shows) yields basically no results. What does it refer to? For some context that lead to this question, I'm not getting my injectors ...
2
votes
1answer
183 views

Volvo V50 felt like it was stalling while accelerating then engine stopped

So I bought a Volvo V50 about half a year ago and have been having some issues with it lately. The one problem that has been recurring is that often the engine has very little power. By little power ...
2
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0answers
18 views

Help maintenance & repair

06 Pontiac g6 will not start! I recently changed fuel pump. I am getting fuel to the fuel rail with pressure but fuel injectors are not opening. I can pour gas in the breather and it will start until ...
2
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0answers
68 views

USA vs Europe fuel injector differences?

This question is out of curiosity as I didn't find any specs or datasheets after plenty searching. What would the differences in the fuel injector be for Europe vs USA markets? I've compared ...
2
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0answers
54 views

Car keeps breaking fuel injectors?

Ok so i'm having quiet a strange issues with one of my cars (08 X5 E70 4.8L V8) that may be worth discussing. It seems to keep "blowing" through injectors on only one bank. Suddenly i noticed CEL and ...
2
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0answers
93 views

07 Camry Engine slow RPM and excessive fuel consumption reading

I have 2007 Camry manual made in Australia for Arabic gulf. The engine sometimes go to 500 rpm and suddenly stops. Or it also goes to 1500 rpm and doesn't return to 1000 rpm (which is the normal as ...
2
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0answers
130 views

1992 Ford F-250 4x4 5.8l 408ci stroker tuning questions

I have a 1992 Ford F-250 4x4 w/a 5.8l blocked 408ci stroker attached to a ZF 5 speed tranny running 3.55 gears. On the engine sits a set of 64cc chambered, 190cc intake runner, 70cc exhaust runner, 2....
1
vote
2answers
2k views

Wiring harness splicing - Soldering or Crimping Method

I need to rebuild the injector harness on an old vehicle using Y-splices on the wire to reduce cable usage/lengths (V12 engine). My question now is how to to the Y-splice on the wires. Soldering ...
1
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1answer
32 views

How can I clean out bad fuel from my diesel engined VW Transporter?

How do I clean out bad fuel from my VW transporter TDI, and also clean the injectors. Can I do this myself? Edit: Dirty/water fuel not incorrect fuel. It’s dirty...
1
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1answer
242 views

Are these fuel injectors leaking? How to fix?

please advise me if these 2 fuel injectors are leaking? If so, how to fix it? My car is Toyota Matrix 2010 (103,000km). (photos below) Thanks.
1
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1answer
64 views

Running fuel injector outside the engine

I want to use an arduino I have lying around to make a fuel injectors tester/cleaner. It looks pretty simple, just connect the injector to a battery and the pin that goes to the ECU to a pulse ...
1
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1answer
153 views

Can fuel trim (LTFT) be too high or too low? Not using stock injectors

Application is a '97 Jeep Cherokee 4.0L straight-six I installed EV6 fuel injectors to replace the outdated EV1 injectors. The new ones are slightly higher flowing I think. old: 23.2 lb/hr @ 49 psi ...
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2answers
94 views

Bad fuel efficiency and suspected sticky / dirty injectors

The fuel efficiency on my 99 Nissan Almera 1.6L MTX has always been a bit below what I would expect, and the idle has gotten a bit rough lately, so I started poking around with a scope to see what I ...
1
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1answer
659 views

Fuel Consumption high

I currently owned a Toyota KDH200. Manfactured year 2006. The Engine is 2KD (2490 cc). (Fuel Type : Diesel) I had an issue with fuel Consumption so I went to a mechanic. He scanned the vehicle (he ...
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0answers
62 views

Diesel engine struggling to start when cold

I have a 2.7D Ford AJD-V6/PSA DT17 diesel engine, on which I recently replaced 3 fuel injectors (all 3 of them were leaking). After the injectors were replaced, I now encounter the following problem: ...
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0answers
23 views

Leaking injectors

How long would it take to damage a diesel motor where oil is diluted heavily with diesel,due to leaking injectors,engine made clunking sound and masses of black smoke poured from exhaust, service ...