Fuel Injectors @ 77k miles. I’m considering replacement.

[Randy2400h]

Has anyone replaced their entire set of fuel injectors? I’m considering replacement due to a consistent stumble while at idle. It hasn’t gotten bad enough to cause the engine to quit, but I’m trying to get ahead of it. I don’t believe it’s an air issue (no vacuum leaks etc) so that leaves fuel and spark. I’ll go through spark plug wires and plugs first, but the reality is that ignition issues are usually easily detected and throw a CE light. Also the spark plugs were changed out with OEM replacements at 50k miles. Maybe the same theory could be said of the fuel injectors but I think they’re less likely to throw a code unless a lean/rich condition is observed by the O2 sensor downstream on that cylinder.

I don’t think the fuel injector replacement is terribly time consuming. And they’re only about $70/injector for replacement.

Also for reference, I have a Mishimoto catch can installed so I don’t think it’s a coked intake valve issue.

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[ctechbob]

It probably isn't the injectors or the spark plugs. It is the DPFE sensor. Plan on replacing it around every 30,000 miles. They cause all kinds of goofy driveability problems in the Rangers. From mis-shifting transmissions to low speed stumbles.

Either get the OEM part, which is a bit pricey, or the Standard Motor Products one that Rockauto has, which is the Motorcraft part with the paint scrubbed off.

I would also run a tankful of Techron through it while you're at it.

After those things, if it still stumbles, look further, but injectors are not usually one of the problems with these trucks.

 

[Techcargt]

As stated by ctechbob ,as try something I learned years ago to help improve throttle response ,Turn ignition switch to the On position,then slowly press the throttle peddle ALL the way down as far as it will go and hold for about 5 seconds then slowly release and then turn ignition off for about 5 seconds. Start truck up and drive to see if it helped or not . This process will reset the TPS to it's lowest and max .

 

[Rp930]

Could be plugs or coils by now also. Why throw the least likely cause at it, injectors?

I would probably throw the EGR sensor at it first as stated above. Also the systems are not that good at catching light or lean misfires. I had a very slight miss at about 25k, no light. Replaced spark plugs with updated version, fixed.

 

[My12SecRanger]

I did the injector upgrade on my old truck, and it was not that bad took 3.5 hours

 

[Racket]

I did the injector upgrade on my old truck, and it was not that bad took 3.5 hours

I missed that I think. I presume you went with higher flow units, which ones and what changes did you get? I presume tune among other hardware.

 

[My12SecRanger]

I got the nostrum injectors which are 40% larger than stock which allowed me to turn up the boost and run higher E content fuel

 

[My12SecRanger]

If you plan to change the injectors there is a special tool for the Teflon seals before you can install the injectors

 

[Racket]

So about a grand for the Stage 1 injectors and another $270 for the tool? I guess if you're going to spend about that much on a turbo upgrade it sounds about right. I wonder what octane levels you'd have to commit to once those are in place? You'd never touch 87-88 octane ever again?

Fuel pump upgrade too? Tune? Farewell warranty?

 

[Randy2400h]

It probably isn't the injectors or the spark plugs. It is the DPFE sensor. Plan on replacing it around every 30,000 miles. They cause all kinds of goofy driveability problems in the Rangers. From mis-shifting transmissions to low speed stumbles.

Either get the OEM part, which is a bit pricey, or the Standard Motor Products one that Rockauto has, which is the Motorcraft part with the paint scrubbed off.

I would also run a tankful of Techron through it while you're at it.

After those things, if it still stumbles, look further, but injectors are not usually one of the problems with these trucks.

Thank you!!

 

[Randy2400h]

This is a perfect example of why I go to the forums before dumping money into troubleshooting. I was once a Fordstar certified tech, and I would not have pinpointed the EGR pressure sensor as the most likely culprit for this issue. My engine symptoms seem to be a near perfect match. I’ll definitely replace this part first before continuing with any additional troubleshooting.

Thanks again fellas.

 

[ctechbob]

To be fair, I don't 100% guarantee my advice, but I've seen it enough, and it is a cheap enough part, and your symptoms match up, that it's the first thing I'd recommend.

 

[Randy2400h]

To be fair, I don't 100% guarantee my advice, but I've seen it enough, and it is a cheap enough part, and your symptoms match up, that it's the first thing I'd recommend.

Sure enough, that fixed it. I just replaced it yesterday.

Thanks again!

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