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Joined
May 17, 2004 · 22 Posts
Discussion Starter · #1 ·
Jul 22, 2004 Lately I had been noticing a slightly rougher idle, which eventually developed into cylinder #5 consistently misfiring. I threw some injector cleaner in the tank and it seemed to clear it up for a few tanks. Yesterday the truck started running extremely rough and my Air/Fuel gauge was pegged at full-rich. The truck won't even idle and the exhaust was
making my eyes burn! The previously failing injector had obviously now completely failed and was stuck open; pouring fuel into the cylinder. I picked up a replacement injector this morning and did the job myself. I already knew what I was getting into, because I had to pull off the fuel rail when I replaced my cams. Tips: Dave
1) Remove the coil-packs only from the side where you're replacing the injector.
2) Remove the two bolts that hold that side of the fuel rail down.
3)
Gently rock the fuel rail and lift until the injectors pop out of the head.
4) Disconnect the electrical connector from the injector.
5) Remove the retainer clip from the injector with a flat head screwdriver (come at it from the top, on the intake manifold side of the injector.)
6) Use both hands to pull down on the injector, and rock it side to side. It'll pop out eventually.
6b) Note: There's a rubber O-ring on the top of the injector that stayed inside the fuel rail when I
removed my injector. I was able to get it out with the help of a small allen wrench.
7) Put some engine oil on the O-ring of the new injector.
8) Put the top of the injector inside the fuel rail and push them together as you rock the injector from side to side. It'll pop in with some effort. You'll know it's in when the slits on the side of the injector are almost even with the bottom of the fuel rail.
9) Put some oil on the bottom O-ring to ease re-entry.
10) Line up all of the
injectors and rock them into place with the fuel rail.
11) Reinstall two bolts on top of the fuel rail.
12) Reinstall electrical connector to injector.
13) Reinstall coil-packs.
14) Turn key to on-position and wait a couple of seconds. Repeat this several times and have someone look at the injector to make sure no fuel is leaking from it.
15) Start the vehicle.
15b) Note: If yours acts like mine, it wouldn't idle when you start it. This is because the computer hasn't yet
adjusted the mixture to compensate for the new (not-stuck) injector. I had to start mine 6 or 7 times before it'd idle. Then I let it run for a few minutes and it was ok. It took about 15 miles of driving before the hesitation off idle cleared up, but now it runs perfectly.
Joined Mar 20, 2016
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8 Posts
Hello Dave, This is a question regarding your mention of idle speed after replacing fuel injector. How did you know to start the engine several times before the engine would idle correctly? I ask because I recently replaced all of the fuel injectors in my 2002 Durango 4.7 engine and the idle is at 1400 and will not go lower. I did restart the engine 5 times
and will try more. However, no codes are shown and others suggest the computer have updated software installed. Do you have any comments to share on this?
Best regards,
Leebar
Joined Mar 20, 2016
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8 Posts
Hello again, Dave, I started the engine over twelve times with the new injectors and the engine, a 4.7L in a 2002 Durango Sport 4WD, will not idle below 1400 RPM. The idle is steady. Do you have any other experience or suggestions which might help with case? Best regards, Leebar
Joined May 23, 2016
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1 Posts
Hello again, Dave, I started the engine over twelve times with the new injectors and the engine, a 4.7L in a 2002 Durango Sport 4WD, will not idle below 1400 RPM. The idle is steady. Do you have any other experience or suggestions which might help with case? Best regards, Leebar Hey not sure if you got this
figured out yet but I had a similar issue after re-assembling my 4.7 after re-conditioning and installing heads. Did you check for a vacuum/air leak? Mine was the hose waaay at the back of the throttle body area had either popped of or more likely I forgot to put back on. High idle sounds like air getting in where it shouldn't, injector would likely just cause a misfire if not functioning properly (too much or too little fuel per revolution, not changing RPMs so much). I'm not an expert by any
means, just sounds familiar to an issue I had. M